Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 2
1 Publication Order Number:
1.5SMC6.8A T3/D
1.5SMCXXXAT3 Series
Zener Transient
V oltage Suppressors
GENERAL DATA IS APPLICABLE TO ALL
SERIES IN THIS GROUP
The SMC series is designed to protect voltage sensitive
components from high voltage, high energy transients. They have
excellent clamping capability, high surge capability, low zener
impedance and fast response time. The SMC series is supplied in
ON Semiconductor’s exclusive, cost-effective, highly reliable
Surmetic package and is ideally suited for use in communication
systems, numerical controls, process controls, medical equipment,
business machines, power supplies and many other
industrial/consumer applications.
Specification Features:
• Standard Zener Breakdown Voltage Range — 6.8 to 91 V
• Stand–off Voltage Range — 5.8 to 78 V
• Peak Power — 1500 Watts @ 1 ms
• Maximum Clamp Voltage @ Peak Pulse Current
• Low Leakage < 5 µA Above 10 V
• UL Recognition
• Maximum Temperature Coefficient Specified
• Available in Tape and Reel
• Response Time is Typically < 1 ns
Mechanical Characteristics:
CASE:
Void-free, transfer-molded, thermosetting plastic
FINISH: All external surfaces are corrosion resistant and leads are
readily solderable
POLARITY: Cathode indicated by molded polarity notch. When
operated in zener mode, will be positive with respect to anode
MOUNTING POSITION: Any
LEADS: Modified L–Bend providing more contact area to bond pads
MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES:
260°C for 10 Seconds
WAFER FAB LOCATION: Phoenix, Arizona
ASSEMBLY/TEST LOCATION: Seremban, Malaysia
MAXIMUM RATINGS
Rating Symbol Value Unit
Peak Power Dissipation (1)
@ TL ≤ 25°C
P
PK
1500 Watts
Forward Surge Current (2)
@ TA = 25°C
I
FSM
200 Amps
Thermal Resistance from Junction to Lead (typical)
R
q
JL
15 °C/W
Operating and Storage Temperature Range TJ, T
stg
– 55 to +150 °C
NOTES: 1. Nonrepetitive current pulse per Figure 2 and derated above TA = 25°C per Figure 3.
NOTES: 2. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.
PLASTIC SURFACE MOUNT
ZENER OVERVOLTAGE
TRANSIENT SUPPRESSORS
5.8–78 VOLTS
1500 WATT PEAK POWER
Devices listed in
bold, italic
are ON Semiconductor
Preferred devices. Preferred devices are recommended
choices for future use and best overall value.
Device Package Shipping
ORDERING INFORMATION
1.5SMCXXXA T3 SMC Tape and Reel
2500 Units/Reel
SMC
PLASTIC
CASE 403
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2
ELECTRICAL CHARACTERISTICS (T
A
= 25°C unless otherwise noted) VF = 3.5 V Max, IF** = 100 A for all types.
Breakdown Voltage*
Working
Peak
Maximum
Reverse
Maximum
Reverse
Maximum
Reverse Voltage
Maximum
VBR @ I
T
Volts
Reverse
Voltage
Leakage
@ V
RWM
Surge
Current
@ I
RSM
(Clamping Voltage)
Temperature
Coefficient
Device
{{
Min Nom Max mA
V
RWM
Volts
I
R
µA
I
RSM
{
Amps
V
RSM
Volts
of V
BR
%/°C
Device
Marking
1.5SMC6.8AT3
1.5SMC7.5AT3
1.5SMC8.2AT3
1.5SMC9.1AT3
6.45
7.13
7.79
8.65
6.8
7.5
8.2
9.1
7.14
7.88
8.61
9.55
10
10
10
1
5.8
6.4
7.02
7.78
1000
500
200
50
143
132
124
112
10.5
11.3
12.1
13.4
0.057
0.061
0.065
0.068
6V8A
7V5A
8V2A
9V1A
1.5SMC10AT3
1.5SMC11AT3
1.5SMC12AT3
1.5SMC13AT3
9.5
10.5
11.4
12.4
10
11
12
13
10.5
11.6
12.6
13.7
1
1
1
1
8.55
9.4
10.2
11.1
10
5
5
5
103
96
90
82
14.5
15.6
16.7
18.2
0.073
0.075
0.078
0.081
10A
11A
12A
13A
1.5SMC15AT3
1.5SMC16AT3
1.5SMC18AT3
1.5SMC20AT3
14.3
15.2
17.1
19
15
16
18
20
15.8
16.8
18.9
21
1
1
1
1
12.8
13.6
15.3
17.1
5
5
5
5
71
67
59.5
54
21.2
22.5
25.2
27.7
0.084
0.086
0.088
0.09
15A
16A
18A
20A
1.5SMC22AT3
1.5SMC24AT3
1.5SMC27AT3
1.5SMC30AT3
20.9
22.8
25.7
28.5
22
24
27
30
23.1
25.2
28.4
31.5
1
1
1
1
18.8
20.5
23.1
25.6
5
5
5
5
49
45
40
36
30.6
33.2
37.5
41.4
0.092
0.094
0.096
0.097
22A
24A
27A
30A
1.5SMC33AT3
1.5SMC36AT3
1.5SMC39AT3
1.5SMC43AT3
31.4
34.2
37.1
40.9
33
36
39
43
34.7
37.8
41
45.2
1
1
1
1
28.2
30.8
33.3
36.8
5
5
5
5
33
30
28
25.3
45.7
49.9
53.9
59.3
0.098
0.099
0.1
0.101
33A
36A
39A
43A
1.5SMC47AT3
1.5SMC51AT3
1.5SMC56AT3
1.5SMC62AT3
44.7
48.5
53.2
58.9
47
51
56
62
49.4
53.6
58.8
65.1
1
1
1
1
40.2
43.6
47.8
53
5
5
5
5
23.2
21.4
19.5
17.7
64.8
70.1
77
85
0.101
0.102
0.103
0.104
47A
51A
56A
62A
1.5SMC68AT3
1.5SMC75AT3
1.5SMC82AT3
1.5SMC91AT3
64.6
71.3
77.9
86.5
68
75
82
91
71.4
78.8
86.1
95.5
1
1
1
1
58.1
64.1
70.1
77.8
5
5
5
5
16.3
14.6
13.3
12
92
103
113
125
0.104
0.105
0.105
0.106
68A
75A
82A
91A
Devices listed in bold, italic are ON Semiconductor Preferred devices.
* * VBR measured at pulse test current IT at an ambient temperaure of 25°C.
* * 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.
{{
Surge current waveform per Figure 2 and derate per Figure 3 of General Data — 1500 Watt at the beginning of this group.
{{
T3 suffix designates tape and reel of 2500 units.
1.5SMCXXXAT3 Series
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3
P , PEAK POWER (kW)
P
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2
tP, PULSE WIDTH
1
10
100
0.1
µs1 µs10 µs 100 µs
1 ms 10 ms
Figure 1. Pulse Rating Curve
01234
0
50
100
t, TIME (ms)
VALUE (%)
HALF VALUE –
I
RSM
2
PEAK VALUE – I
RSM
t
r
tr≤ 10 µs
Figure 2. Pulse Waveform
Figure 3. Pulse Derating Curve
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT @ T
A
= 25 C°
100
80
60
40
20
0
0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
120
140
160
t
P
PULSE WIDTH (tP) IS DEFINED
AS THAT POINT WHERE THE PEAK
CURRENT DECAYS TO 50%
OF I
RSM
.
∆VZ, INSTANTANEOUS INCREASE IN VZ ABOVE VZ (NOM) (VOLTS)
0.3 0.5 0.7 1 2 3 5 7 10 20 30
I
Z
, ZENER CURRENT (AMPS)
1000
500
200
100
50
1
2
5
10
20
TL=25°C
tP=10µs
VZ(NOM) = 6.8 TO 13 V
20 V
24 V
43 V
75 V
120 V
180 V
Figure 4. Dynamic Impedance
UL RECOGNITION
The entire series has Underwriters Laboratory
Recognition for the classification of protectors (QVGV2)
under the UL standard for safety 497B and File #116110.
Many competitors only have one or two devices recognized
or have recognition in a non-protective category. Some
competitors have no recognition at all. With the UL497B
recognition, our parts successfully passed several tests
including Strike Voltage Breakdown test, Endurance
Conditioning, Temperature test, Dielectric
Voltage-Withstand test, Discharge test and several more.
Whereas, some competitors have only passed a
flammability test for the package material, we have been
recognized for much more to be included in their Protector
category .
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APPLICATION NOTES
RESPONSE TIME
In most applications, the transient suppressor device is
placed in parallel with the equipment or component to be
protected. In this situation, there is a time delay associated
with the capacitance of the device and an overshoot
condition associated with the inductance of the device and
the inductance of the connection method. The capacitive
effect is of minor importance in the parallel protection
scheme because it only produces a time delay in the
transition from the operating voltage to the clamp voltage as
shown in Figure 5.
The inductive effects in the device are due to actual
turn-on time (time required for the device to go from zero
current to full current) and lead inductance. This inductive
effect produces an overshoot in the voltage across the
equipment or component being protected as shown in
Figure 6. Minimizing this overshoot is very important in the
application, since the main purpose for adding a transient
suppressor is to clamp voltage spikes. The SMC series have
a very good response time, typically < 1 ns and negligible
inductance. However, external inductive effects could
produce unacceptable overshoot. Proper circuit layout,
minimum lead lengths and placing the suppressor device as
close as possible to the equipment or components to be
protected will minimize this overshoot.
Some input impedance represented by Zin is essential to
prevent overstress of the protection device. This impedance
should be as high as possible, without restricting the circuit
operation.
DUTY CYCLE DERATING
The data of Figure 1 applies for non-repetitive conditions
and at a lead temperature of 25°C. If the duty cycle increases,
the peak power must be reduced as indicated by the curves
of Figure 7. Average power must be derated as the lead or
ambient temperature rises above 25°C. The average power
derating curve normally given on data sheets may be
normalized and used for this purpose.
At first glance the derating curves of Figure 7 appear to be
in error as the 10 ms pulse has a higher derating factor than
the 10 µs pulse. However, when the derating factor for a
given pulse of Figure 7 is multiplied by the peak power value
of Figure 1 for the same pulse, the results follow the
expected trend.
1.5SMCXXXAT3 Series
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5
V
L
V
V
in
Vin (TRANSIENT)
V
L
t
d
V
Vin (TRANSIENT)
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
tD = TIME DELAY DUE TO CAPACITIVE EFFECT
t t
Figure 5. Figure 6.
Figure 7. Typical Derating Factor for Duty Cycle
DERATING FACTOR
1 ms
10 µs
1
0.7
0.5
0.3
0.05
0.1
0.2
0.01
0.02
0.03
0.07
100 µs
0.1 0.2 0.5 2 5 10 501 20 100
D, DUTY CYCLE (%)
PULSE WIDTH
10 ms
TYPICAL PROTECTION CIRCUIT
V
in
V
L
Z
in
LOAD
1.5SMCXXXAT3 Series
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6
OUTLINE DIMENSIONS
1500 Watt Peak Power
Transient Voltage Suppressors – Surface Mounted
CASE 403
(SMC)
(Refer to Section 10 of the TVS/Zener Data Book (DL150/D) for Surface Mount, Thermal Data and Footprint Information.)
SMC Footprint
0.171
4.343
0.110
2.794
0.150
3.810
mm
inches
A
S
B
C
D
KP
H
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. D DIMENSION SHALL BE MEASURED WITHIN
DIMENSION P.
MIN MINMAX MAX
INCHES MILLIMETERS
DIM
A
B
C
D
H
J
K
P
S
6.60
5.59
1.90
2.92
0.051
0.15
0.76
7.75
7.11
6.10
2.41
3.07
0.152
0.30
1.27
8.13
0.260
0.220
0.075
0.115
0.0020
0.006
0.030
0.305
0.280
0.240
0.095
0.121
0.0060
0.012
0.050
0.320
0.51 REF0.020 REF
J
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7
Notes
1.5SMCXXXAT3 Series
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8
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