ON Semiconductor NTMD2C02R2 Technical data

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NTMD2C02R2
Preferred Device
Power MOSFET 2 Amps, 20 Volts
These miniature surface mount MOSFET s feature ultra low R
DS(on)
and true logic level performance. They are capable of withstanding high energy in the avalanche and commutation modes and the drain–to–source diode has a very low reverse recovery time. MiniMOS devices are designed for use in low voltage, high speed switching applications where power efficiency is important. Typical applications are dc–dc converters, and power management in portable and battery powered products such as computers, printers, cellular and cordless phones. They can also be used for low voltage motor controls in mass storage products such as disk drives and tape drives.
Ultra Low R
Provides Higher Efficiency and Extends
DS(on)
Battery Life
Logic Level Gate Drive – Can Be Driven by Logic ICs
Miniature SO–8 Surface Mount Package – Saves Board Space
Diode Is Characterized for Use In Bridge Circuits
Diode Exhibits High Speed, With Soft Recovery
I
Specified at Elevated Temperature
DSS
Mounting Information for SO–8 Package Provided
MAXIMUM RATINGS (T
Rating
Drain–to–Source Voltage
N–Channel
P–Channel Gate–to–Source Voltage V Drain Current – Continuous N–Channel
– Pulsed N–Channel
Operating and Storage Temperature Range TJ and
Total Power Dissipation @ TA= 25°C
(Note 2) Thermal Resistance – Junction to Ambient
(Note 2) Maximum Lead Temperature for Soldering
Purposes, 1/8 from case for 10 seconds.
1. Negative signs for P–Channel device omitted for clarity.
2. Mounted on 2 ″ square FR4 board (1″ sq. 2 oz. Cu 0.06″ thick single sided) with one die operating, 10 sec. max.
= 25°C unless otherwise noted) (Note 1)
J
Symbol Value Unit
V
P–Channel
P–Channel
R
I
T
P
DSS
GS
I
D
DM
stg
D
θ
JA
T
L
20 20
±12 Vdc
5.2
3.4 48 17
–55 to
150
2.0 Watts
62.5 °C/W
260 °C
Vdc
A
°C
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2 AMPERES
20 VOLTS
R
DS(on)
R
DS(on)
G
D2C02 = Specific Device Code L = Location Code Y = Year WW = Work Week
Device Package Shipping
= 43 m (N–Channel)
= 120 m (P–Channel)
N–Channel
D
G
S
8
1
SO–8, Dual
CASE 751 STYLE 14
PIN ASSIGNMENT
N–Source
N–Gate
P–Source
P–Gate
ORDERING INFORMATION
1 2 3 4
Top View
8 7 6 5
P–Channel
D
MARKING DIAGRAM
D2C02 LYWW
N–Drain N–Drain
P–Drain P–Drain
S
Semiconductor Components Industries, LLC, 2002
September, 2002 – Rev. 0
NTMD2C02R2 SO–8 2500/Tape & Reel
Preferred devices are recommended choices for future use and best overall value.
1 Publication Order Number:
NTMD2C02R2/D
NTMD2C02R2
)
(V
DD
Vdc, I
D
Adc
V
GS
Vdc
(V
DS
Vdc, I
D
Adc
V
GS
Vdc
ELECTRICAL CHARACTERISTICS (T
= 25°C unless otherwise noted) (Note 3)
A
Characteristic Symbol Polarity Min Typ Max Unit
OFF CHARACTERISTICS
Drain–Source Breakdown Voltage
= 0 Vdc, ID = 250 µAdc)
(V
GS
Zero Gate Voltage Drain Current
(V
= 0 Vdc, VDS = 20 Vdc)
GS
= 0 Vdc, VDS = 12 Vdc)
(V
GS
Gate–Body Leakage Current
= ±12 Vdc, VDS = 0)
(V
GS
V
(BR)DSS
I
DSS
I
GSS
ON CHARACTERISTICS (Note 4)
Gate Threshold Voltage
= VGS, ID = 250 µAdc)
(V
DS
Drain–to–Source On–Resistance
(V
= 4.5 Vdc, ID = 4.0 Adc)
GS
= 4.5 Vdc, ID = 2.4 Adc)
(V
GS
Drain–to–Source On–Resistance
(V
= 2.7 Vdc, ID = 2.0 Adc)
GS
= 2.7 Vdc, ID = 1.2 Adc)
(V
GS
Forward Transconductance
(V
= 2.5 Vdc, ID = 2.0 Adc)
DS
= 2.5 Vdc, ID = 1.0 Adc)
(V
DS
V
GS(th)
R
DS(on)
R
DS(on)
g
FS
DYNAMIC CHARACTERISTICS
Input Capacitance
Output Capacitance
(VDS = 10 Vdc, VGS = 0 Vdc,
C
iss
C
oss
f = 1.0 MHz)
Transfer Capacitance
C
rss
SWITCHING CHARACTERISTICS (Note 5)
Turn–On Delay Time
Rise Time
Turn–Off Delay Time
Fall Time
Turn–On Delay Time
Rise Time
Turn–Off Delay Time
Fall Time
(VDD = 16 Vdc, ID = 4.0 Adc,
16
V
GS
R
= 4.5 Vdc,
= 6.0 Ω)
G
4.0
(VDD = 10 Vdc, ID = 1.2 Adc,
= 2.7 Vdc,
= 2.7
V
R
= 6.0 Ω)
G
(VDS = 16 Vdc, ID = 6.0 Adc,
16
= 4.5 Vdc,
V
GS
R
= 6.0 Ω)
G
(V
= 10 Vdc, ID = 2.4 Adc,
DS
V
= 4.5 Vdc,
= 4.5
= 6.0 Ω)
R
G
,
6.0
,
t
d(on)
,
t
r
t
d(off)
t
f
t
d(on)
,
t
r
t
d(off)
t
f
3. Negative signs for P–Channel device omitted for clarity.
4. Pulse Test: Pulse Width ≤300 µs, Duty Cycle ≤ 2%.
5. Switching characteristics are independent of operating junction temperature.
(N) (P)
(N) (P)
20 20
– –
– –
– –
100
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
0.6
0.6
0.07
0.1
3.0
3.0
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
0.9
0.9
0.028–0.043
0.033–0.048
0.13
6.0
4.75
785
1100
540 210
215
75
100
11 15
35 40
45 35
60 35
12 10
50 35
45 33
80 29
– –
1.0
1.0
1.2
1.2
0.1
– –
750 450
325 180
175
18
65
75
110
20 20
90 65
75 60
130
55
Vdc
µAdc
nAdc
Vdc
Ohm
Ohm
mhos
pF
ns
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2
NTMD2C02R2
)
V
GS
Vdc)
(
(I
F
I
S
ELECTRICAL CHARACTERISTICS – continued (T
= 25°C unless otherwise noted) (Note 6)
A
Characteristic Symbol Polarity Min Typ Max Unit
SWITCHING CHARACTERISTICS – continued (Note 8)
Total Gate Charge Q
Gate–Source Charge
Gate–Drain Charge
(VDS = 10 Vdc, ID = 4.0 Adc,
V
= 4.5 Vdc)
GS
(V
= 6.0 Vdc, ID = 2.0 Adc,
DS
V
= 4.5 Vdc
= 4.5
T
Q
1
Q
2
Q
3
SOURCE–DRAIN DIODE CHARACTERISTICS (TC = 25°C)
Forward Voltage (Note 7)
Reverse Recovery Time
Reverse Recovery Stored
(IS = 4.0 Adc, VGS = 0 Vdc) (I
= 2.4 Adc, VGS = 0 Vdc)
S
I
= I
,
=
dI
/dt = 100 A/µs)
S
,
V
SD
t
rr
t
a
t
b
Q
RR
Charge
6. Negative signs for P–Channel device omitted for clarity.
7. Pulse Test: Pulse Width ≤300 µs, Duty Cycle ≤ 2%.
8. Switching characteristics are independent of operating junction temperature.
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
(N) (P)
– –
– –
– –
– –
– –
– –
– –
– –
– –
12 10
1.5
1.5
4.0
5.0
3.0
3.0
0.83
0.88 30
37 15
16 15
21
0.02
0.025
20 18
1.1
1.0
nC
– –
– –
– –
Vdc
ns
– –
– –
– –
µC
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3
12
10
8
6
4
, DRAIN CURRENT (AMPS)
D
2
I
10 V
NTMD2C02R2
TYPICAL ELECTRICAL CHARACTERISTICS
N–Channel P–Channel
2.5 V
4.5 V
3.2 V
2.0 V
TJ = 25°C
1.8 V
VGS = 1.5 V
4
3
2
1
DRAIN CURRENT (AMPS)
D,
–I
VGS = –2.1 V
VGS = –10 V
= –4.5 V
V
GS
V
= –2.5 V
GS
TJ = 25°C
VGS = –1.9 V
VGS = –1.7 V
VGS = –1.5 V
0
12
10
8
6
4
, DRAIN CURRENT (AMPS)
2
D
I
0
V
, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
DS
Figure 1. On–Region Characteristics
VDS 10 V
100°C
TJ = –55°C
VGS, GATE–TO–SOURCE VOLTAGE (VOLTS)
25°C
Figure 2. Transfer Characteristics
1.751.51.2510.750.50.250
0
0
–V
, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
DS
6
84210
Figure 1. On–Region Characteristics
5
VDS –10 V
4
3
2
TJ = 25°C
DRAIN CURRENT (AMPS)
1
D,
TJ = 100°C
–I
2.521.510.5
0
1
, GATE–TO–SOURCE VOLTAGE (VOLTS)
–V
GS
TJ = 55°C
1.5 2
2.5
3
Figure 2. Transfer Characteristics
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0
0.07
0.06
0.05
0.04
0.03
NTMD2C02R2
TYPICAL ELECTRICAL CHARACTERISTICS
N–Channel P–Channel
0.2
ID = 6.0 A T
= 25°C
J
0.15
TJ = 25°C
0.1
0.02
0.01
, DRAIN–TO–SOURCE RESISTANCE (OHMS)
0
DS(on)
R
0.05
0.04
0.03
0.02
, DRAIN–TO–SOURCE RESISTANCE (OHMS)
0.01
DS(on)
R
VGS, GATE–TO–SOURCE VOLTAGE (VOLTS)
Figure 4. On–Resistance versus Drain Current
Figure 3. On–Resistance versus
Gate–To–Source Voltage
TJ = 25°C
VGS = 2.5 V
4.5 V
7531
ID, DRAIN CURRENT (AMPS)
and Gate Voltage
0.05
, DRAIN–TO–SOURCE RESISTANCE ()
DS(on)
R
0.12
0.1
0.08
0.06
, DRAIN–TO–SOURCE RESISTANCE ()
0.04
DS(on)
R
0
2
TJ = 25°C
1
1086420
11913
Figure 4. On–Resistance versus Drain Current
46
–V
GATE–TO–SOURCE VOLTAGE (VOLTS)
GS,
Figure 3. On–Resistance versus
Gate–To–Source Voltage
VGS = –2.7 V
VGS = –4.5 V
1.5 2 2.5 3.5 –ID, DRAIN CURRENT (AMPS)
and Gate Voltage
8
4.543
1.6
1.4
1.2
1
(NORMALIZED)
0.8
, DRAIN–TO–SOURCE RESISTANCE
0.6
DS(on)
R
ID = 6.0 A V
= 4.5 V
GS
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. On–Resistance Variation with
Temperature
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1.6
1.4
1.2
1
, DRAIN–TO–SOURCE
0.8
DS(on)
R
RESISTANCE (NORMALIZED)
1501251007550250–25–50
0.6 –50
5
ID = –2.4 A
V
= –4.5 V
GS
–25 0 25 75
T
JUNCTION TEMPERATURE (°C)
J,
Figure 5. On–Resistance Variation with
Temperature
15
12510050
NTMD2C02R2
TYPICAL ELECTRICAL CHARACTERISTICS
N–Channel P–Channel
1000
, LEAKAGE (nA)
I
100
10
DSS
0.1
0.01
VGS = 0 V
TJ = 125°C
100°C
1
VDS, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
Figure 6. Drain–To–Source Leakage
Current versus Voltage
25°C
POWER MOSFET SWITCHING
Switching behavior is most easily modeled and predicted
by recognizing that the power MOSFET is charge controlled. The lengths of various switching intervals (∆t) are determined by how fast the FET input capacitance can be charged by current from the generator.
The published capacitance data is difficult to use for calculating rise and fall because drain–gate capacitance varies greatly with applied voltage. Accordingly, gate charge data is used. In most cases, a satisfactory estimate of average input current (I
) can be made from a
G(AV)
rudimentary analysis of the drive circuit so that t = Q/I
G(AV)
During the rise and fall time interval when switching a resistive load, VGS remains virtually constant at a level known as the plateau voltage, V
. Therefore, rise and fall
SGP
times may be approximated by the following: tr = Q2 x RG/(VGG – V tf = Q2 x RG/V
GSP
GSP
)
where VGG = the gate drive voltage, which varies from zero to V
GG
RG = the gate drive resistance and Q2 and V
are read from the gate charge curve.
GSP
During the turn–on and turn–off delay times, gate current is not constant. The simplest calculation uses appropriate values from the capacitance curves in a standard equation for voltage change in an RC network. The equations are:
t
d(on)
t
d(off)
= RG C
= RG C
In [VGG/(V
iss
In (VGG/V
iss
GG
GSP
– V
)
GSP
)]
1000
VGS = 0 V
100
10
LEAKAGE (nA)
1
DSS,
–I
0.1
20161284
0.01 –V
DS,
Figure 6. Drain–To–Source Leakage
The capacitance (C
TJ = 125°C
TJ = 100°C
TJ = 25°C
4 8 12 16
DRAIN–TO–SOURCE VOLTAGE (VOLTS)
Current versus Voltage
) is read from the capacitance curve at
iss
200
a voltage corresponding to the off–state condition when calculating t on–state when calculating t
and is read at a voltage corresponding to the
d(on)
.
d(off)
At high switching speeds, parasitic circuit elements complicate the analysis. The inductance of the MOSFET source lead, inside the package and in the circuit wiring which is common to both the drain and gate current paths, produces a voltage at the source which reduces the gate drive current. The voltage is determined by Ldi/dt, but since di/dt is a function of drain current, the mathematical solution is complex. The MOSFET output capacitance also complicates the mathematics. And finally, MOSFETs have finite internal gate resistance which effectively adds to the resistance of the driving source, but the internal resistance is difficult to measure and, consequently, is not specified.
The resistive switching time variation versus gate resistance (Figure 9) shows how typical switching performance is affected by the parasitic circuit elements. If the parasitics were not present, the slope of the curves would maintain a value of unity regardless of the switching speed. The circuit used to obtain the data is constructed to minimize common inductance in the drain and gate circuit loops and is believed readily achievable with board mounted components. Most power electronic loads are inductive; the data in the figure is taken with a resistive load, which approximates an optimally snubbed inductive load. Power MOSFETs may be safely operated into an inductive load; however, snubbing reduces switching losses.
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2500
,
2000
VDS = 0 V VGS = 0 V
C
iss
NTMD2C02R2
N–Channel P–Channel
1500
TJ = 25°C
1200
C
iss
VDS = 0 V VGS = 0 V
TJ = 25°C
1500
C
rss
1000
C, CAPACITANCE (pF)
500
C
rss
0
10 0 5 105
V
V
DS
GS
GATE–TO–SOURCE OR DRAIN–TO–SOURCE
VOLTAGE (VOLTS)
Figure 7. Capacitance Variation
, GATE–TO–SOURCE VOLTAGE (VOLTS)
GS
V
5
4
V
DS
3
Q1
2
1
0
0
QT
V
GS
ID = 6 A V
Q2
48 16
DS
V
GS
T
= 25°C
J
12
= 16 V = 4.5 V
Qg, TOTAL GATE CHARGE (nC)
Figure 8. Gate–To–Source and Drain–To–Source
Voltage versus Total Charge
C
iss
C
oss
15 20
20
16
12
8
4
0
900
C
rss
600
C, CAPACITANCE (pF)
300
0
5051015
–V
–V
GATE–TO–SOURCE OR DRAIN–TO–SOURCE
DS
GS
VOLTAGE (VOLTS)
Figure 7. Capacitance Variation
5
QT
4
, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
DS
V
3
2
1
GATE–TO–SOURCE VOLTAGE (VOLTS)
0
GS,
–V
Q1
Q2
V
DS
246 10 14
Q
, TOTAL GATE CHARGE (nC)
g
V
GS
ID = –2.4 A
80
Figure 8. Gate–To–Source and Drain–To–Source
Voltage versus Total Charge
T
J
C C
= 25°C
12
C
iss
oss
rss
2010
20 18 16 14 12 10 8 6 4 2
0
DRAIN–TO–SOURCE VOLTAGE (VOLTS)
DS
–V
1000
VDS = 16 V I
= 4.0 A
D
= 4.5 V
V
GS
100
t
t
d(off)
t
d(on)
f
t
r
t, TIME (ns)
10
1 10 100
RG, GATE RESISTANCE (OHMS)
Figure 9. Resistive Switching Time
Variation versus Gate Resistance
1000
100
t, TIME (ns)
10
1.0
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7
VDD = –10 V
= –1.2 A
I
D
VGS = –2.7 V
t
r
t
d (off)
t
d (on)
R
GATE RESISTANCE (OHMS)
G,
Figure 9. Resistive Switching Time
Variation versus Gate Resistance
t
f
10010
NTMD2C02R2
DRAIN–TO–SOURCE DIODE CHARACTERISTICS
The switching characteristics of a MOSFET body diode are very important in systems using it as a freewheeling or commutating diode. Of particular interest are the reverse recovery characteristics which play a major role in determining switching losses, radiated noise, EMI and RFI.
System switching losses are largely due to the nature of the body diode itself. The body diode is a minority carrier device, therefore it has a finite reverse recovery time, t to the storage of minority carrier charge, Q
, as shown in
RR
, due
rr
the typical reverse recovery wave form of Figure 14. It is this stored charge that, when cleared from the diode, passes through a potential and defines an energy loss. Obviously, repeatedly forcing the diode through reverse recovery further increases switching losses. Therefore, one would like a diode with short t
and low QRR specifications to
rr
minimize these losses.
The abruptness of diode reverse recovery effects the amount of radiated noise, voltage spikes, and current ringing. The mechanisms at work are finite irremovable circuit parasitic inductances and capacitances acted upon by
N–Channel P–Channel
5
VGS = 0 V T
= 25°C
4
J
high di/dts. The diode’s negative di/dt during t
is directly
a
controlled by the device clearing the stored charge. However, the positive di/dt during tb is an uncontrollable diode characteristic and is usually the culprit that induces current ringing. Therefore, when comparing diodes, the ratio of t
serves as a good indicator of recovery
b/ta
abruptness and thus gives a comparative estimate of probable noise generated. A ratio of 1 is considered ideal and values less than 0.5 are considered snappy.
Compared to ON Semiconductor standard cell density low voltage MOSFETs, high cell density MOSFET diodes are faster (shorter t
), have less stored charge and a softer
rr
reverse recovery characteristic. The softness advantage of the high cell density diode means they can be forced through reverse recovery at a higher di/dt than a standard cell MOSFET diode without increasing the current ringing or the noise generated. In addition, power dissipation incurred from switching the diode will be less due to the shorter recovery time and lower switching losses.
2
VGS = 0 V
T
= 25°C
1.6
J
3
2
1
, SOURCE CURRENT (AMPS)
S
I
0
0 0.2 0.4 0.6
V
, SOURCE–TO–DRAIN VOLTAGE (VOLTS)
SD
0.8 1.0
1.2
1.2
0.8
SOURCE CURRENT (AMPS)
0.4
S,
–I
0
SOURCE–TO–DRAIN VOLTAGE (VOLTS)
–V
SD,
Figure 10. Diode Forward Voltage versus Current Figure 10. Diode Forward Voltage versus Current
0.90.80.70.60.50.4
1
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8
NTMD2C02R2
di/dt = 300 A/µs
, SOURCE CURRENT
S
I
Figure 11. Reverse Recovery Time (trr)
SAFE OPERATING AREA
The Forward Biased Safe Operating Area curves define the maximum simultaneous drain–to–source voltage and drain current that a transistor can handle safely when it is forward biased. Curves are based upon maximum peak junction temperature and a case temperature (T
) of 25°C.
C
Peak repetitive pulsed power limits are determined by using the thermal response data in conjunction with the procedures discussed in AN569, “Transient Thermal Resistance – General Data and Its Use.”
Switching between the off–state and the on–state may traverse any load line provided neither rated peak current (I
) nor rated voltage (V
DM
) is exceeded, and that the
DSS
transition time (tr, tf) does not exceed 10 µs. In addition the
Standard Cell Density
t
rr
High Cell Density
t
rr
t
b
t
a
t, TIME
total power averaged over a complete switching cycle must not exceed (T
J(MAX)
– TC)/(R
).
JC
θ
A power MOSFET designated E–FET can be safely used in switching circuits with unclamped inductive loads. For reliable operation, the stored energy from circuit inductance dissipated in the transistor while in avalanche must be less than the rated limit and must be adjusted for operating conditions differing from those specified. Although industry practice is to rate in terms of energy, avalanche energy capability is not a constant. The energy rating decreases non–linearly with an increase of peak current in avalanche and peak junction temperature.
N–Channel P–Channel
100
VGS = 20 V
10
, DRAIN CURRENT (AMPS)
0.1
D
I
0.01
SINGLE PULSE T
= 25°C
C
10 ms
1
Mounted on 2 sq. FR4 board (1 sq. 2 oz. Cu 0.06 thick single sided) with one die operating, 10s max.
0.1
, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
V
DS
dc
R
LIMIT
DS(on)
THERMAL LIMIT PACKAGE LIMIT
1
100 µs
1 ms
Figure 12. Maximum Rated Forward Biased
Safe Operating Area
10
10 µs
100
100
10
, DRAIN CURRENT (AMPS)
0.1
D
I
0.01
VGS = 8 V SINGLE PULSE
T
= 25°C
C
1
0.1
V
, DRAIN–TO–SOURCE VOLTAGE (VOLTS)
DS
Mounted on 2 sq. FR4 board (1 sq. 2 oz. Cu 0.06 thick single sided) with one die operating, 10s max.
1 ms
10 ms
dc
R
LIMIT
DS(on)
THERMAL LIMIT PACKAGE LIMIT
1
10
Figure 12. Maximum Rated Forward Biased
Safe Operating Area
100
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NTMD2C02R2
TYPICAL ELECTRICAL CHARACTERISTICS
10
1
D = 0.5
0.2
0.1
THERMAL RESISTANCE
0.01
Rthja(t), EFFECTIVE TRANSIENT
0.1
0.05
0.02
0.01
Normalized to θja at 10s.
0.0175 0.0710 0.2706 0.5776 0.7086
Chip
SINGLE PULSE
0.001
1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 t, TIME (s)
Figure 13. Thermal Response
di/dt
I
S
t
rr
t
t
a
b
t
p
0.25 I
S
I
S
TIME
107.55 F1.7891 F0.3074 F0.0854 F0.0154 F
Ambient
1.0E+02 1.0E+03
Figure 14. Diode Reverse Recovery Waveform
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NTMD2C02R2
INFORMATION FOR USING THE SO–8 SURFACE MOUNT PACKAGE
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a c ritical p ortion o f t he total design. The footprint for the semiconductor packages must be the correct size to ensure proper solder connection
0.275
7.0
0.024
0.6
SO–8 POWER DISSIPATION
The power dissipation of the SO–8 is a function of the input pad size. This can vary from the minimum pad size for soldering to the pad size given for maximum power dissipation. Power dissipation for a surface mount device is determined by T temperature of the die, R
, the maximum rated junction
J(max)
, the thermal resistance from
JA
θ
the device junction to ambient; and the operating temperature, T
. Using the values provided on the data
A
sheet for the SO–8 package, PD can be calculated as follows:
PD =
J(max)
A
R
θ
JA
– T
T
The values for the equation are found in the maximum ratings table on the data sheet. Substituting these values
interface between the board and the package. With the correct pad geometry, the packages will self–align when subjected to a solder reflow process.
0.060
1.52
0.155
4.0
0.050
1.270
inches
mm
into the equation for an ambient temperature TA of 25°C, one can calculate the power dissipation of the device which in this case is 2.0 Watts.
150°C – 25°C
PD =
62.5°C/W
= 2.0 Watts
The 62.5°C/W for the SO–8 package assumes the
recommended footprint on a glass epoxy printed circuit board to achieve a power dissipation of 2.0 Watts using the footprint shown. Another alternative would be to use a ceramic substrate or an aluminum core board such as Thermal Clad. Using board material such as Thermal Clad, the power dissipation can be doubled using the same footprint.
SOLDERING PRECAUTIONS
The melting temperature of solder is higher than the rated temperature of the device. When the entire device is heated to a high temperature, failure to complete soldering within a short time could result in device failure. Therefore, the following items should always be observed in order to minimize the thermal stress to which the devices are subjected.
Always preheat the device.
The delta temperature between the preheat and
soldering should be 100°C or less.*
When preheating and soldering, the temperature of the
leads and the case must not exceed the maximum temperature ratings as shown on the data sheet. When using infrared heating with the reflow soldering method, the difference shall be a maximum of 10°C.
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The soldering temperature and time shall not exceed 260°C for more than 10 seconds.
When shifting from preheating to soldering, the maximum temperature gradient shall be 5°C or less.
After soldering has been completed, the device should be allowed to cool naturally for at least three minutes. Gradual cooling should be used as the use of forced cooling will increase the temperature gradient and result in latent failure due to mechanical stress.
Mechanical stress or shock should not be applied during cooling.
* Soldering a device without preheating can cause excessive thermal shock and stress which can result in damage to the device.
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TYPICAL SOLDER HEATING PROFILE
For any given circuit board, there will be a group of control settings that will give the desired heat pattern. The operator must set temperatures for several heating zones and a figure for belt speed. Taken together, these control settings make up a heating “profile” for that particular circuit board. On machines controlled by a computer, the computer remembers these profiles from one operating session to the next. Figure 15 shows a typical heating profile for use when soldering a surface mount device to a printed circuit board. This profile will vary among soldering systems, but it is a good starting point. Factors that can affect the profile include the type of soldering system in use, density and types of components on the board, type of solder used, and the type of board or substrate material being used. This profile shows
200°C
150°C
100°C
STEP 1
PREHEAT
ZONE 1 “RAMP”
DESIRED CURVE FOR HIGH
STEP 2
VENT
“SOAK”
MASS ASSEMBLIES
150°C
100°C
HEATING
ZONES 2 & 5
STEP 3
“RAMP”
temperature versus time. The line on the graph shows the actual temperature that might be experienced on the surface of a test board at or near a central solder joint. The two profiles are based on a high density and a low density board. The Vitronics SMD310 convection/infrared reflow soldering system was used to generate this profile. The type of solder used was 62/36/2 Tin Lead Silver with a melting point between 177–189°C. When this type of furnace is used for solder reflow work, the circuit boards and solder joints tend to heat first. The components on the board are then heated by conduction. The circuit board, because it has a large surface area, absorbs the thermal energy more efficiently, then distributes this energy to the components. Because of this effect, the main body of a component may be up to 30 degrees cooler than the adjacent solder joints.
STEP 4
HEATING
ZONES 3 & 6
“SOAK”
160°C
140°C
STEP 5
HEATING
ZONES 4 & 7
“SPIKE”
170°C
SOLDER IS LIQUID FOR
40 TO 80 SECONDS
(DEPENDING ON
MASS OF ASSEMBLY)
STEP 6
VENT
STEP 7
COOLING
205° TO 219°C
PEAK AT SOLDER
JOINT
5°C
DESIRED CURVE FOR LOW
MASS ASSEMBLIES
TIME (3 TO 7 MINUTES TOTAL) T
Figure 15. Typical Solder Heating Profile
MAX
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–Y–
–Z–
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PACKAGE DIMENSIONS
SO–8
CASE 751–07
ISSUE AA
NOTES:
–X–
A
58
B
1
S
0.25 (0.010)
4
M
M
Y
K
G
C
SEATING PLANE
0.10 (0.004)
H
D
0.25 (0.010) Z
M
Y
SXS
N
X 45
M
1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION.
6. 751-01 THRU 751-06 ARE OBSOLETE. NEW STANDAARD IS 751-07
MILLIMETERS
DIMAMIN MAX MIN MAX
4.80 5.00 0.189 0.197
B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.053 0.069 D 0.33 0.51 0.013 0.020
G 1.27 BSC 0.050 BSC
H 0.10 0.25 0.004 0.010
J
J 0.19 0.25 0.007 0.010 K 0.40 1.27 0.016 0.050
M 0 8 0 8

N 0.25 0.50 0.010 0.020 S 5.80 6.20 0.228 0.244
STYLE 14:
PIN 1. NSOURCE
2. NGATE
3. PSOURCE
4. PGATE
5. PDRAIN
6. PDRAIN
7. NDRAIN
8. NDRAIN
INCHES
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NTMD2C02R2
MiniMOS is a trademark of Semiconductor Components Industries, LLC (SCILLC). Thermal Clad is a registered trademark of the Bergquist Company.
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