1
Motorola Small–Signal Transistors, FETs and Diodes Device Data
N–Channel
MAXIMUM RATINGS
Rating Symbol Value Unit
Drain–Source Voltage VDSS 100 Vdc
Gate–Source Voltage
— Continuous
— Non–repetitive (tp ≤ 50 µs) VGS
VGSM ±20
±40 Vdc
Vpk
Drain Current
Continuous(1)
Pulsed(2) ID
IDM 0.17
0.68
Adc
THERMAL CHARACTERISTICS
Characteristic Symbol Max Unit
Total Device Dissipation FR–5 Board(3)
TA = 25°C
Derate above 25°C
PD225
1.8
mW
mW/°C
Thermal Resistance, Junction to Ambient R
q
JA 556 °C/W
Junction and Storage Temperature TJ, Tstg –55 to +150 °C
DEVICE MARKING
BSS123LT1 = SA
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
Characteristic Symbol Min Typ Max Unit
OFF CHARACTERISTICS
Drain–Source Breakdown Voltage
(VGS = 0, ID = 250 µAdc) V(BR)DSS 100 — — Vdc
Zero Gate Voltage Drain Current
(VGS = 0, VDS = 100 Vdc) TJ = 25°C
TJ = 125°C
IDSS —
——
—15
60
µAdc
Gate–Body Leakage Current
(VGS = 20 Vdc, VDS = 0) IGSS — — 50 nAdc
ON CHARACTERISTICS(4)
Gate Threshold Voltage
(VDS = VGS, ID = 1.0 mAdc) VGS(th) 0.8 — 2.8 Vdc
Static Drain–Source On–Resistance
(VGS = 10 Vdc, ID = 100 mAdc) rDS(on) —5.0 6.0 Ω
Forward T ransconductance
(VDS = 25 Vdc, ID = 100 mAdc) gfs 80 — — mmhos
1. The Power Dissipation of the package may result in a lower continuous drain current.
2. Pulse Width
v
300
m
s, Duty Cycle
v
2.0%.
3. FR–5 = 1.0
0.75
0.062 in.
4. Pulse Test: Pulse Width
v
300
m
s, Duty Cycle
v
2.0%.
Preferred devices are Motorola recommended choices for future use and best overall value.
Order this document
by BSS123LT1/D
SEMICONDUCTOR TECHNICAL DATA
Motorola Preferred Device
12
3
CASE 318–08, STYLE 21
SOT–23 (T O–236AB)
Motorola, Inc. 1997
3 DRAIN
2 SOURCE
1
GATE
REV 2
BSS123LT1
2 Motorola Small–Signal Transistors, FETs and Diodes Device Data
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) (Continued)
Characteristic Symbol Min Typ Max Unit
DYNAMIC CHARACTERISTICS
Input Capacitance
(VDS = 25 Vdc, VGS = 0, f = 1.0 MHz) Ciss —20 — pF
Output Capacitance
(VDS = 25 Vdc, VGS = 0, f = 1.0 MHz) Coss —9.0 — pF
Reverse T ransfer Capacitance
(VDS = 25 Vdc, VGS = 0, f = 1.0 MHz) Crss —4.0 — pF
SWITCHING CHARACTERISTICS(4)
Turn–On Delay Time (VCC = 30 Vdc, IC = 0.28 Adc, td(on) —20 — ns
T urn–Off Delay Time
(CC ,C,
VGS = 10 Vdc, RGS = 50 Ω)td(off) —40 — ns
REVERSE DIODE
Diode Forward On–Voltage
(ID = 0.34 Adc, VGS = 0 Vdc) VSD — — 1.3 V
4. Pulse Test: Pulse Width
v
300
m
s, Duty Cycle
v
2.0%.
ID, DRAIN CURRENT (AMPS)
rDS(on), ST ATIC DRAIN–SOURCE ON–RESISTANCE
(NORMALIZED)
VGS(th), THRESHOLD VOLTAGE (NORMALIZED) ID, DRAIN CURRENT (AMPS)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0100 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
VDS, DRAN SOURCE VOLTAGE (VOLTS)
Figure 1. Ohmic Region
1.0
0.8
0.6
0.4
0.2
100 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
VGS, GATE SOURCE VOLTAGE (VOLTS)
Figure 2. Transfer Characteristics
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
1.2
1.05
1.1
1.10
1.0
0.95
0.9
0.85
0.8
0.75
0.7
–60 –20 +20 +60 +100 +140 –60 –20 +20 +60 +100 +140
T, TEMPERA TURE (
°
C)
Figure 3. Temperature versus Static
Drain–Source On–Resistance
T, TEMPERA TURE (
°
C)
Figure 4. Temperature versus Gate
Threshold Voltage
TA = 25
°
C
VGS = 10 V
9 V
8 V
7 V
6 V
4 V
3 V
5 V
VDS = 10 V –55
°
C25
°
C
125
°
C
VGS = 10 V
ID = 200 mA VDS = VGS
ID = 1.0 mA
BSS123LT1
3
Motorola Small–Signal Transistors, FETs and Diodes Device Data
INFORMATION FOR USING THE SOT–23 SURFACE MOUNT PACKAGE
MINIMUM RECOMMENDED FOOTPRINT 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
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
SOT–23
mm
inches
0.037
0.95
0.037
0.95
0.079
2.0
0.035
0.9
0.031
0.8
SOT–23 POWER DISSIPATION
The power dissipation of the SOT–23 is a function of the
pad size. This can vary from the minimum pad size for
soldering to a pad size given for maximum power dissipation.
Power dissipation for a surface mount device is determined
by TJ(max), the maximum rated junction temperature of the
die, RθJA, the thermal resistance from the device junction to
ambient, and the operating temperature, TA. Using the
values provided on the data sheet for the SOT–23 package,
PD can be calculated as follows:
PD = TJ(max) – TA
RθJA
The values for the equation are found in the maximum
ratings table on the data sheet. Substituting these values into
the equation for an ambient temperature T A of 25°C, one can
calculate the power dissipation of the device which in this
case is 225 milliwatts.
PD = 150°C – 25°C
556°C/W = 225 milliwatts
The 556°C/W for the SOT–23 package assumes the use
of the recommended footprint on a glass epoxy printed circuit
board to achieve a power dissipation of 225 milliwatts. There
are other alternatives to achieving higher power dissipation
from the SOT–23 package. 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, an aluminum core board, 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.
•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.
BSS123LT1
4 Motorola Small–Signal Transistors, FETs and Diodes Device Data
PACKAGE DIMENSIONS
DJ
K
L
A
C
BS
H
GV
3
12
CASE 318–08
ISSUE AE
SOT–23 (TO–236AB)
DIM
AMIN MAX MIN MAX
MILLIMETERS
0.1102 0.1197 2.80 3.04
INCHES
B0.0472 0.0551 1.20 1.40
C0.0350 0.0440 0.89 1.11
D0.0150 0.0200 0.37 0.50
G0.0701 0.0807 1.78 2.04
H0.0005 0.0040 0.013 0.100
J0.0034 0.0070 0.085 0.177
K0.0180 0.0236 0.45 0.60
L0.0350 0.0401 0.89 1.02
S0.0830 0.0984 2.10 2.50
V0.0177 0.0236 0.45 0.60
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD
FINISH THICKNESS. MINIMUM LEAD THICKNESS
IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
STYLE 21:
PIN 1. GATE
2. SOURCE
3. DRAIN
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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/Af firmative Action Employer.
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BSS123LT1/D
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