LESHAN RADIO COMPANY, LTD.
Bias Resistor Transistors
NPN Silicon Surface Mount Transistors
with Monolithic Bias Resistor Network
This new series of digital transistors is designed to replace a single
device and its external resistor bias 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. The BRT eliminates these individual components by
integrating them into a single device. The use of a BRT can reduce
both system cost and board space. The device is housed in the SOT-23
package which is designed for low power surface mount applications.
LMUN2237LT1
•
Simplifies Circuit Design
•
Reduces Board Space
•
Reduces Component Count
PIN 2
BASE
(INPUT)
R
1
R
2
PIN 3
COLLECTOR
(OUTPUT)
PIN 1
EMITTER
(GROUND)
CASE 318–08, STYLE 6
SOT– 23 (TO–236AB)
ESD Rating
–
MAXIMUM RATINGS
(T
A
= 25°C unless otherwise noted)
Rating
Collector-Base Voltage
Collector-Emitter Voltage
Collector Current
Symbol
V
CBO
V
CEO
I
C
Value
50
50
100
Unit
Vdc
Vdc
mAdc
THERMAL CHARACTERISTICS
Characteristic
Total Device Dissipation
T
A
= 25°C
Derate above 25°C
Thermal Resistance –
Junction-to-Ambient
Thermal Resistance –
Junction-to-Lead
Junction and Storage
Temperature Range
1. FR–4 @ Minimum Pad
2. FR–4 @ 1.0 x 1.0 inch Pad
Symbol
P
D
Max
230 (Note 1)
338 (Note 2)
1.8 (Note 1)
2.7 (Note 2)
540 (Note 1)
370 (Note 2)
264 (Note 1)
287 (Note 2)
–55 to +150
Unit
mW
°C/W
°C/W
°C/W
°C
R
θJA
R
θJL
T
J
, T
stg
LMUN2237LT1-1/4
LESHAN RADIO COMPANY, LTD.
LMUN2237LT1
DEVICE MARKING AND RESISTOR VALUES
Device
LMUN2237LT1
Package
SOT-23
Marking
A8P
R1 (K)
47
R2 (K)
22
3. New devices. Updated curves to follow in subsequent data sheets.
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted) (Continued)
Characteristic
Symbol
Min
Typ
Max
Unit
OFF CHARACTERISTICS
Collector-Base Cutoff Current (V
CB
= 40 V, I
E
= 0)
Collector-Emitter Cutoff Current (V
CE
= 40 V, I
B
= 0)
Emitter-Base Cutoff Current
(V
BE
= 6.0 V, I
C
= 0)
Collector-Base Breakdown Voltage (I
C
= 10
µA,
I
E
= 0)
Collector-Emitter Breakdown Voltage (Note 4)
(I
C
= 2.0 mA, I
B
= 0)
I
CBO
I
CEO
I
EBO
V
(BR)CBO
V
(BR)CEO
–
–
–
50
50
–
–
–
–
–
50
50
0.13
–
–
nAdc
nAdc
mAdc
Vdc
Vdc
ON CHARACTERISTICS
(Note 4)
DC Current Gain
(V
CE
= 10 V, I
C
= 5.0 mA)
Collector-Emitter Saturation Voltage (I
C
= 10 mA, I
B
= 5 mA)
Output Voltage (on)
(V
CC
= 5.0 V, V
B
= 4.0 V, R
L
= 1.0 kΩ)
Input Resistor
Resistor Ratio
4. Pulse Test: Pulse Width < 300
µs,
Duty Cycle < 2.0%
h
FE
V
CE(sat)
V
OL
R
1
R
1
/R
2
80
140
–
–
–
0.25
0.2
61.1
2.6
Vdc
Vdc
kΩ
–
32.9
1.7
–
47
2.1
350
P
D
, POWER DISSIPATION (mW)
250
200
150
100
50
0
–50
R
θJA
= 370°C/W
0
50
100
T
A
, AMBIENT TEMPERATURE (°C)
150
Figure 1. Derating Curve
LMUN2237LT1-2/4
LESHAN RADIO COMPANY, LTD.
TYPICAL ELECTRICAL CHARACTERISTICS – LMUN2237LT1
V
CE(sat)
, COLLECTOR VOLTAGE (VOLTS)
1
I
C
/I
B
= 10
T
A
= –25°C
25°C
75°C
0.1
h
FE
, DC CURRENT GAIN
1000
V
CE
= 10 V
75°C
100
T
A
= –25°C
25°C
10
0.01
0
5
10
20
30
15
25
I
C
, COLLECTOR CURRENT (mA)
35
40
1
1
10
I
C
, COLLECTOR CURRENT (mA)
100
Figure 2. V
CE(sat)
versus I
C
Figure
3.
DC Current Gain
2
1.8
C
ob
, CAPACITANCE (pF)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
5
f = 1 MHz
l
E
= 0 V
T
A
= 25°C
10
15
20
25
30
35
40
V
R
, REVERSE BIAS VOLTAGE (VOLTS)
45
I
C
, COLLECTOR CURRENT (mA)
100
75°C
T
A
= –25°C
25°C
10
1
0.1
0.01
V
O
= 5 V
0
2
4
6
8
10
12
V
in
, INPUT VOLTAGE (VOLTS)
14
16
0.001
Figure
4.
Output Capacitance
Figure
5.
Output Current versus Input Voltage
100
V
in
, INPUT VOLTAGE (VOLTS)
V
O
= 0.2 V
T
A
= –25°C
25°C
10
75°C
1
0
5
15
25
10
20
30
I
C
, COLLECTOR CURRENT (mA)
35
40
Figure
6.
Input Voltage versus Output Current
LMUN2237LT1-3/4
LESHAN RADIO COMPANY, LTD.
LMUN2237LT1
SOT-23
NOTES:
A
L
3
1
2
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
B S
DIM
A
B
C
D
G
H
J
K
L
S
V
V
G
C
D
H
K
J
INCHES
MIN
MAX
0.1102
0.1197
0.0472
0.0551
0.0350
0.0440
0.0150
0.0200
0.0701
0.0807
0.0005
0.0040
0.0034
0.0070
0.0140
0.0285
0.0350
0.0401
0.0830
0.1039
0.0177
0.0236
MILLIMETERS
MIN
MAX
2.80
3.04
1.20
1.40
0.89
1.11
0.37
0.50
1.78
2.04
0.013
0.100
0.085
0.177
0.35
0.69
0.89
1.02
2.10
2.64
0.45
0.60
PIN 1. BASE
2. EMITTER
3. COLLECTOR
0.037
0.95
0.037
0.95
0.079
2.0
0.035
0.9
0.031
0.8
inches
mm
LMUN2237LT1-4/4
DSP and ARM Processors
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