Page 1
This product complies with the RoHS Directive (EU 2002/95/EC).
B
C
E
Transistors
2SD1478A
Silicon NPN epitaxial planar type darlington
For low frequency amplification
Features
Forward current transfer ratio hFE is designed high, which is appropriate to the
driver circuit of motors and printer hammer.
A shunt resistor is omitted from the driver.
Package
Code
Mini3-G1
Pin Name
1: Base
Absolute Maximum Ratings Ta = 25°C
Parameter Symbol Rating Unit
Collector-base voltage (Emitter open) V
Collector-emitter voltage (Base open) V
Emitter-base voltage (Collector open) V
Collector current I
Peak collector current I
Collector power dissipation P
Junction temperature T
Storage temperature T
CBO
CEO
EBO
C
CP
C
j
stg
60 V
50 V
5 V
500 mA
750 mA
200 mW
150
-55 to +150
°C
°C
2: Emitter
3: Collector
Marking Symbol: 2O
Internal Connection
Electrical Characteristics Ta = 25°C±3°C
Parameter Symbol Conditions Min Typ Max Unit
Collector-base voltage (Emitter open) V
Collector-emitter voltage (Base open) V
Emitter-base voltage (Collector open) V
Collector-base cutoff current (Emitter open) I
Emitter-base cutoff current (Collector open) I
1,
2
*
Forward current transfer ratio
Collector-emitter saturation voltage
Base-emitter saturation voltage
*
1
*
1
*
Transition frequency f
Note) 1. Measuring methods are based on JAPANESE INDUSTRIAL STANDARD JIS C 7030 measuring methods for transistors.
2. *1: Pulse measurement
*2: Rank classification
Rank Q R
h
FE
4 000 to 10 000 8 000 to 20 000
CBOIC
CEOIC
EBOIE
CBO
EBO
h
FE
V
CE(sat)IC
V
BE(sat)IC
T
= 100 mA, IE = 0 60 V
= 1 mA, IB = 0 50 V
= 100 mA, IC = 0 5 V
VCB = 25 V, IE = 0 100 nA
VEB = 4 V, IC = 0 100 nA
VCE = 10 V, IC = 500 mA 4 000 20 000
= 500 mA, IB = 0.5 mA 2.5 V
= 500 mA, IB = 0.5 mA 3.0 V
VCB = 10 V, IE = -50 mA, f = 200 MHz 200 MHz
Publication date: October 2008 SJC00414AED 1
Page 2
This product complies with the RoHS Directive (EU 2002/95/EC).
0
40
80
120 160
0
80
160
240
2SD1478A_ PC-T
a
Collector power dissipation P
C
(
mW
)
Ambient temperature Ta (°C)
10
−1
1 10 10
2
10
−1
1
10
10
2
10
3
2SD1478A_ IC-V
CE
Collector current I
C
(
mA
)
Collector-emitter voltage VCE (V)
Ta = 25°C
IB = 50 µA
45 µA
40 µA
35 µA
30 µA
25 µA
20 µA
15 µA
10 µA
5 µA
10
−2
10
−1
1 10
10
−1
10
1
2SD1478A_ V
CE(sat)-IC
Collector-emitter saturation voltage V
CE(sat)
(
V
)
Collector current IC (A)
IC / IB = 1 000
Ta = 75°C
25°C
−25°C
10
−2
10
−1
1 10
10
−1
10
1
2SD1478A_ V
BE(sat)-IC
Base-emitter saturation voltage V
BE(sat)
(
V
)
Collector current IC (A)
IC / IB = 1 000
Ta = −25°C
25°C
75°C
10
−2
10
−1
1
10
2
10
3
10
4
10
5
2SD1478A_ hFE-I
C
Forward current transfer ratio h
FE
Collector current IC (A)
V
CE
= 10 V
Ta = 75°C
25°C
−25°C
1
10 10
2
0
2
4
6
2SD1478A_ Cob-V
CB
Collector output capacitance
(Common base, input open circuited) C
ob
(pF)
Collector-base voltage VCB (V)
IE = 0
f = 1 MHz
Ta = 25°C
2SD1478A
PC Ta IC VCE V
V
IC hFE IC Cob V
BE(sat)
CE(sat)
I
C
CB
2 SJC00414AED
Page 3
This product complies with the RoHS Directive (EU 2002/95/EC).
Mini3-G1 Unit: mm
(0.95)
(0.95)
1.9 ±0.1
0.40
1.50
2.8
2.90
3
2
1
5
°
0.4 ±0.2
0.16
1
0
°
1.1
1.1
0 to 0.1
(0.65)
+0.10
−0.05
+0.25
−0.05
+0.2
−0.3
+0.20
−0.05
+0.2
−0.1
+0.3
−0.1
+0.10
−0.05
2SD1478A
SJC00414AED 3
Page 4
Request for your special attention and precautions in using the technical information and
semiconductors described in this book
(1)If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and
regulations of the exporting country, especially, those with regard to security export control, must be observed.
(2)The technical information described in this book is intended only to show the main characteristics and application circuit examples
of the products. No license is granted in and to any intellectual property right or other right owned by Panasonic Corporation or any
other company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any
other company which may arise as a result of the use of technical information described in this book.
(3)The products described in this book are intended to be used for standard applications or general electronic equipment (such as office
equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
– Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body.
– Any applications other than the standard applications intended.
(4)The products and product specifications described in this book are subject to change without notice for modification and/or im-
provement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5)When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6)Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which
damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages.
(7)This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of our company.
20080805
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