®
MJE521
SILICON NPN TRANSISTOR
s
STMicroelectronics PREFERRED
SALESTYPE
DESCRIPTION
The MJE521 is a silicon Epitaxial-Base NPN
transistor in Jedec SOT-32 plastic package.
It is intended for use in 5 to 20W audio amplifiers,
general purpose amplifier and switching circuits.
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C
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CM
I
B
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INTERNAL SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CBO
V
CEO
V
EBO
Parameter
Collector-Base Voltage (I
E
= 0)
Collector-Emitter Voltage (I
B
= 0)
Emitter-Base Voltage (I
C
= 0)
Collector Current
Collector Peak Current (t
p
< 5 ms)
Base Current
Total Dissipation at Tc
≤
25
o
C
Storage Temperature
Max. Operating Junction Temperature
Value
40
40
4
4
8
2
40
-65 to 150
150
Unit
V
V
V
A
A
A
W
o
o
C
C
September 2003
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MJE521
THERMAL DATA
R
thj-amb
Thermal Resistance Junction-ambient
Max
3.12
o
C/W
ELECTRICAL CHARACTERISTICS
(T
case
= 25
o
C unless otherwise specified)
Symbol
I
CBO
I
EBO
Parameter
Collector Cut-off
Current (I
E
= 0)
Emitter Cut-off Current
(I
C
= 0)
Test Conditions
V
CB
= 40 V
V
EB
= 4 V
I
C
= 0.1 A
40
Min.
Typ.
Max.
100
100
Unit
µA
µA
V
V
CEO(sus)
∗
Collector-Emitter
Sustaining Voltage
(I
B
= 0)
h
FE
DC Current Gain
I
C
= 1 A
V
CE
= 1 V
40
∗
Pulsed: Pulse duration = 300µs, duty cycle
≤
1.5%
bs
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2/4
MJE521
SOT-32 (TO-126) MECHANICAL DATA
mm
MIN.
A
B
b
b1
C
c1
D
e
e3
F
G
H
H2
I
O
V
2.15
1.27
3
7.4
10.5
0.7
0.40
2.4
1.0
15.4
2.2
4.4
3.8
3.2
2.54
TYP.
MAX.
7.8
10.8
0.9
0.65
2.7
1.3
16.0
MIN.
0.291
0.413
0.028
0.015
0.094
0.039
0.606
inch
TYP.
MAX.
0.307
0.425
0.035
0.025
DIM.
0.118
bs
O
et
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o
ro
P
e
uc
d
)-
(s
t
0.3
10
o
b
O
so
te
le
ro
P
0.087
0.173
0.150
0.084
0.05
0.011
10
o
uc
d
0.106
0.051
s)
t(
0.630
0.126
0.100
1: Base
2: Collector
3: Emitter
0016114/B
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MJE521
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a trademark of STMicroelectronics.
All other names are the property of their respective owners.
© 2003 STMicroelectronics – All Rights reserved
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