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SEMICONDUCTOR TECHNICAL DATA
Order this document
by DTA143EE/D
PNP Silicon Surface Mount Transistor with
Monolithic Bias Resistor Network
The BRT (Bias Resistor Transistor) contains a single transistor with a monolithic
bias network consisting of two resistors; a series base resistor and a base–emitter
resistor. These digital transistors are designed to replace a single device and its
external resistor bias network. The BRT eliminates these individual components by
integrating them into a single device. The DTA143EE is housed in the
SOT–416/SC–90 package which is ideal for low–power surface mount applications
where board space is at a premium.
• Simplifies Circuit Design
• Reduces Board Space
• Reduces Component Count
• Available in 8 mm, 7 inch/3000 Unit Tape and Reel.
MAXIMUM RATINGS
Output Voltage V
Input Voltage V
Output Current I
DEVICE MARKING
DTA143EE = 43
THERMAL CHARACTERISTICS
Power Dissipation @ TA = 25°C
Operating and Storage Temperature Range TJ, T
Junction Temperature T
(TA = 25°C unless otherwise noted)
Rating Symbol Value Unit
(1)
O
I
O
P
D
stg
J
3
2
1
CASE 463–01, STYLE 1
SOT–416/SC–90
R
IN (1)
R1 = 4.7 k
R2 = 4.7 k
–55 to +150 °C
1
R
2
Ω
Ω
–50 Vdc
–30 Vdc
–100 mAdc
*125 mW
150 °C
OUT (3)
GND (2)
ELECTRICAL CHARACTERISTICS (T
Characteristic
Input Off Voltage (VO = –5.0 Vdc, IO = –100 µAdc) V
Input On Voltage (VO = –0.3 Vdc, IO = –20 mAdc) V
Output On Voltage (IO = –10 mAdc, II = –0.5 mAdc) V
Input Current (VI = –5.0 Vdc) I
Output Cutoff Current (VO = –50 Vdc) I
DC Current Gain (VO = –5.0 Vdc, IO = –10 mAdc) G
Input Resistance R
Resistance Ratio R1/R
1. Device mounted on a FR–4 glass epoxy printed circuit board using the minimum recommended footprint.
* Typical electrical characteristic curves are not available at this time.
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
Thermal Clad is a trademark of the Bergquist Company
Motorola Small–Signal Transistors, FETs and Diodes Device Data
Motorola, Inc. 1996
= 25°C)
A
Symbol Min Typ Max Unit
I(off)
I(on)
O(on)
I
O(off)
I
1
2
— — –0.5 Vdc
–3.0 — — Vdc
— — –0.3 Vdc
— — –1.8 mAdc
— — –500 nAdc
20 — — —
3.3 4.7 6.1 kOhms
0.8 1.0 1.2
1
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DT A143EE
MINIMUM RECOMMENDED FOOTPRINTS FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a critical portion of the total
design. The footprint for the semiconductor packages must
be the correct size to insure proper solder connection
0.5 min. (3x)
TYPICAL
SOLDERING PATTERN
Unit: mm
0.5 min. (3x)
SOT–416/SC–90 POWER DISSIPATION
The power dissipation of the SOT–416/SC–90 is a function
of the 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
ture of the die, R
junction to ambient; and the operating temperature, TA.
Using the values provided on the data sheet, PD can be
calculated as follows:
The values for the equation are found in the maximum
ratings table on the data sheet. Substituting these values into
, the maximum rated junction tempera-
J(max)
, the thermal resistance from the device
θJA
T
PD =
J(max)
R
θJA
– T
A
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
0.5
1
1.4
the equation for an ambient temperature TA of 25°C, one can
calculate the power dissipation of the device which in this
case is 125 milliwatts.
150°C – 25°C
PD =
The 1000°C/W assumes the use of the recommended
footprint on a glass epoxy printed circuit board to achieve a
power dissipation of 125 milliwatts. Another alternative would
be to use a ceramic substrate or an aluminum core board
such as Thermal Clad. Using a board material such as
Thermal Clad, a higher power dissipation can be achieved
using the same footprint.
1000°C/W
= 125 milliwatts
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 should be a maximum of 10°C.
• The soldering temperature and time should not exceed
260°C for more than 10 seconds.
• When shifting from preheating to soldering, the
maximum temperature gradient should 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.
2
Motorola Small–Signal Transistors, FETs and Diodes Device Data
Page 3
SOLDER STENCIL GUIDELINES
DT A143EE
Prior to placing surface mount components onto a printed
circuit board, solder paste must be applied to the pads. A
solder stencil is required to screen the optimum amount of
solder paste onto the footprint. The stencil is made of brass
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 1 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
temperature versus time. The line on the graph shows the
or stainless steel with a typical thickness of 0.008 inches.
The stencil opening size for the surface mounted package
should be the same as the pad size on the printed circuit
board, i.e., a 1:1 registration.
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.
200
150
100
50°C
STEP 1
PREHEA T
ZONE 1
“RAMP”
°
C
DESIRED CURVE FOR HIGH
°
C
°
C
TIME (3 TO 7 MINUTES TOTAL)
STEP 2
VENT
“SOAK”
MASS ASSEMBLIES
150°C
100°C
Figure 1. T ypical Solder Heating Profile
STEP 3
HEATING
ZONES 2 & 5
“RAMP”
DESIRED CURVE FOR LOW
MASS ASSEMBLIES
STEP 4
HEATING
ZONES 3 & 6
“SOAK”
160°C
°
C
140
T
MAX
STEP 6
VENT
205
SOLDER JOINT
STEP 5
HEATING
ZONES 4 & 7
“SPIKE”
170°C
SOLDER IS LIQUID FOR
40 TO 80 SECONDS
(DEPENDING ON
MASS OF ASSEMBLY)
STEP 7
COOLING
°
TO 219°C
PEAK AT
Motorola Small–Signal Transistors, FETs and Diodes Device Data
3
Page 4
DT A143EE
P ACKAGE DIMENSIONS
S
3 PL
D
0.20 (0.008) B
M
J
–A–
3
L
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
2
G
–B–
1
0.20 (0.008) A
K
STYLE 1:
PIN 1. BASE
2. EMITTER
3. COLLECTOR
C
H
CASE 463–01
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
DIM MIN MAX MIN MAX
A 0.70 0.80 0.028 0.031
B 1.40 1.80 0.055 0.071
C 0.60 0.90 0.024 0.035
D 0.15 0.30 0.006 0.012
G 1.00 BSC 0.039 BSC
H ––– 0.10 ––– 0.004
J 0.10 0.25 0.004 0.010
K 1.45 1.75 0.057 0.069
L 0.10 0.20 0.004 0.008
S 0.50 BSC 0.020 BSC
INCHESMILLIMETERS
ISSUE A
SOT–416/SC–90
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
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Opportunity/Affirmative Action Employer.
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Motorola Small–Signal Transistors, FETs and Diodes Device Data
DTA143EE/D
*DTA143EE/D*
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