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Ordering number:ENN4135
PNP/NPN Epitaxial Planar Silicon Transistors
2SA1855/2SC4837
50V/4A Switching Applications
Applications
· Power supplies, relay drivers, lamp drivers.
Features
· Adoption of FBET and MBIT processes.
· Large allowable collector dissipation.
· Low saturation voltage.
· Wide ASO and large current capacity.
· Usage of radial taping to meet automatic mounting.
Package Dimensions
unit:mm
2084B
[2SA1855/2SC4837]
4.5
10.5
1.9
1.2
2.6
1.4
( ) : 2SA1855
Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter
Collector-to-Base Voltage
Collector-to-Emitter Voltage
Emitter-to-Base Voltage
Collector Current
Colletor Current (Pulse)
Collector Dissipation
Junction Temperature
Storage Temperature
Symbol
VCBO
VCEO
VEBO
IC
ICP
PC
Tj
Tstg
1.2
1.6
0.5
123
2.5
Conditions
2.5
0.5
1 : Emitter
2 : Collector
3 : Base
SANYO : FLP
Ratings
(–)60
(–)50
(–)6
(–)4
(–)6
1.5
150
–55 to +150
Unit
V
V
V
A
A
W
˚C
˚C
Electrical Characteristics at Ta = 25˚C
Parameter
Symbol
Conditions
Collector Cutoff Current
Emitter Cutoff Current
DC Current Gain
Gain Bandwidth Product
Output Capacitance
ICBO
IEBO
hFE1
hFE2
fT
Cob
VCB=()40V, IE=0
VEB=()4V, IC=0
VCE=()2V, IC=()10mA
VCE=()2V, IC=()3A
VCE=()10V, IC=()50mA
VCB=()10V, f=1MHz
* : The 2SA1855/2SC4837 are classified by 100mA hFE as follows :
Rank
hFE
RST
100 to 200 140 to 280 200 to 400
Ratings
min typ max
Unit
()1 µA
()1 µA
100*
40
400*
150
(39)25
MHz
pF
Continued on next page.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
91003TN (KT)/91098HA (KT)/5132MH (KOTO) No.4135–1/4

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2SA1855/2SC4837
Continued from preceding page.
Parameter
Symbol
Conditions
Collector-to-Emitter Saturation Voltage
Base-to-Emitter Saturation Voltage
Collector-to-Base Breakdown Voltage
Collector-to-Emitter Breakdown Voltage
Emitter-to-Base Breakdown Voltage
Turn-ON Time
Storage Time
Fall Time
Switching Time Test Circuit
VCE(sat) IC=()2A, IB=()100mA
VBE(sat)
V(BR)CBO
V(BR)CEO
V(BR)EBO
ton
IC=()2A, IB=()100mA
IC=10µA, IE=0
IC=1mA, RBE=
IE=10µA, IC=0
See specified Test CIrcuit
tstg See specified Test CIrcuit
tf See specified Test Circuit
PW=20µs
DC1%
INPUT
IB1
IB2
OUTPUT
RB RL
VR
50+
25
+
100µF 470µF
VBE= --5V
VCC=25V
IC=10IB1= --10IB2=1A
Ratings
min typ
(350)
190
()0.94
()60
()50
()6
70
(450)
650
(30)35
max
(700)
500
()1.2
Unit
mV
mV
V
V
V
V
ns
ns
ns
ns
--5
2SA1855
--4
--3
IC -- VCE
--200mA
--100mA
--50mA
--2 --20mA
--10mA
--1 --5mA
0
0
--2.0
--1.6
--1.2
--0.8
IB=0
--0.4
--0.8
--1.2
--1.6
--2.0
Collector-to-Emitter Voltage, VCE – V ITR04917
IC -- VCE
--12mA
--10mA
2SA1855
--8mA
--6mA
--4mA
--2mA
--0.4
0 IB=0
0 --4 --8 --12 --16 --20
Collector-to-Emitter Voltage, VCE – V ITR04919
5
2SC4837
4
3
2
1
IC -- VCE
100mA
80mA
60mA
40mA
20mA
10mA
5mA
0 IB=0
0 0.4 0.8 1.2 1.6 2.0
Collector-to-Emitter Voltage, VCE – V ITR04918
IC -- VCE
2.0
2SC4837
8mA
1.6 7mA
6mA
1.2 5mA
4mA
0.8 3mA
2mA
0.4
1mA
0 IB=0
0 4 8 12 16 20
Collector-to-Emitter Voltage, VCE – V ITR04920
No.4135–2/4

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2SA1855/2SC4837
IC -- VBE
IC -- VBE
--4.8 4.8
2SA1855
2SC4837
VCE= --2V
--4.0 4.0
VCE=2V
--3.2 3.2
--2.4 2.4
--1.6 1.6
--0.8
0
0
1000
7
5
3
2
100
7
5
3
2
--0.2 --0.4 --0.6 --0.8 --1.0 --1.2 --1.4
Base-to-Emitter Voltage, VBE – V ITR04921
hFE -- IC
2SA1855
VCE= --2V
Ta=75°C
25°C
--25°C
10
7 --0.01
1000
7
5
2 3 5 7 --0.1 2 3 5 7 --1.0
Collector Current, IC – A
fT -- IC
23 5
ITR04923
VCE=10V
3
2 2SC4837
2SA1855
100
7
5
3
2
10 (For PNP, minus sign is omitted.)
0.01 2 3 5 7 0.1 2 3 5 7 1.0
Collector Current, IC – A
VCE(sat) -- IC
5
3
2
2 3 5 7 10
ITR04925
2SA1855
IC / IB=20
--1000
7
5
3
2
--100
7
5
3
2
25°C
Ta=
--25°C
75°C
--10
7 --0.01 2 3 5 7 --0.1 2 3 5 7 --1.0
Collector Current, IC – A
23 5
ITR04927
0.8
0
0
1000
7
5
3
2
100
7
5
3
2
0.2 0.4 0.6 0.8 1.0 1.2 1.4
Base-to-Emitter Voltage, VBE – V ITR04922
hFE -- IC
2SC4837
VCE=2V
Ta=75°C 25°C
--25°C
10
7 0.01
5
3
2 3 5 7 0.1 2 3 5 7 1.0
Collector Current, IC – A
Cob -- VCB
23 5
ITR04924
f=1MHz
2
100
7
5 2SA1855
3 2SC4837
2
(For PNP, minus sign is omitted.)
10
1.0
23
5 7 10
23
5 7 100
Collector-to-Base Voltage, VCB – V ITR04926
VCE(sat) -- IC
5
2SC4837
3 IC / IB=20
2
1000
7
5
3
2
100
7
5
25°C
3 Ta=75°C
2 --25°C
10
7 0.01
2 3 5 7 0.1 2 3 5 7 1.0
Collector Current, IC – A
23 5
ITR04928
No.4135–3/4

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2SA1855/2SC4837
VBE(sat) -- IC
--10
2SA1855
7 IC / IB=20
5
3
2
--1.0 Ta= --25°C 25°C
7
5 75°C
3
2
7 --0.01 2 3 5 7 --0.1 2 3 5 7 --1.0 2 3 5
Collector Current, IC – A
ITR04929
ASO
10
7 ICP=6.0A
5 IC=4.0A
3
2
2SA1855 / 2SC4837
100m1s0m1sms
1.0
7
5
DC operation
3
2
0.1
7
5 Ta=25°C
Single pulse
3
2
For PNP, minus sign is omitted.
2 3 5 7 1.0
2 3 5 7 10
23
Collector-to-Emitter Voltage, VCE – V
5 7 100
ITR04931
VBE(sat) -- IC
10
2SC4837
7 IC / IB=20
5
3
2
1.0
25°C
Ta= --25°C
7
5 75°C
3
2
0.1
7 0.01
1.6
1.5
1.4
2 3 5 7 0.1 2 3 5 7 1.0
Collector Current, IC – A
PC -- Ta
23 5
ITR04930
2SA1855 / 2SC4837
1.2
1.0
0.8
0.6
0.4
0.2
0
0 20 40 60 80 100 120 140 160
Ambient Temperature, Ta – ˚C
ITR04932
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of September, 2003. Specifications and information herein are
subject to change without notice.
PS No.4135–4/4