
Transistor
2SD1244
Silicon NPN epitaxial planer type
For low-frequency power amplification
Features
■
●
Low collector to emitter saturation voltage V
●
Satisfactory operation performances at high efficiency with the 
low-voltage power supply.
●
M type package allowing easy automatic and manual insertion as 
well as stand-alone fixing to the printed circuit board.
Absolute Maximum Ratings (Ta=25˚C)
■
Parameter
Collector to base voltage 
Collector to emitter voltage 
Emitter to base voltage 
Peak collector current 
Collector current 
Collector power dissipation 
Junction temperature 
Storage temperature
*
Printed circuit board: Copper foil area of 1cm2 or more, and the board 
thickness of 1.7mm for the collector portion
Symbol
V
CBO
V
CEO
V
EBO
I
CP
I
C
*
P
C
T
j
T
stg
Ratings
40 
20
150
–55 ~ +150
7 
8 
5 
1
CE(sat)
.
Unit
V 
V 
V 
A
A 
W 
˚C 
˚C
6.9±0.1
1.5
1.5 R0.9
0.4
R0.9
R0.7
1.0±0.1
0.85
0.55±0.1 0.45±0.05
2.5 2.5
1:Base 
2:Collector EIAJ:SC–71 
3:Emitter M Type Mold Package
2.5±0.1
3.5±0.1
2.0±0.2
2.4±0.21.25±0.05
123
Unit: mm
1.0
1.0
4.1±0.2 4.5±0.1
Electrical Characteristics (Ta=25˚C)
■
Parameter
Collector cutoff current 
Emitter cutoff current 
Collector to emitter voltage 
Emitter to base voltage
Forward current transfer ratio
Collector to emitter saturation voltage 
Transition frequency 
Collector output capacitance
*1
h
 Rank classification
FE1
Symbol
I
CBO
I
EBO
V
CEO
V
EBO
h
FE1
h
FE2
V
CE(sat)
f
T
C
ob
Rank Q R
h
FE1
230 ~ 380 340 ~ 600
Conditions
VCB = 10V, IE = 0 
VEB = 7V, IC = 0 
IC = 1mA, IB = 0 
IE = 10µA, IC = 0
*1
VCE = 2V, IC = 0.5A 
VCE = 2V, IC = 2A 
IC = 3A, IB = 0.1A
*2
*2
*2
VCB = 6V, IE = –50mA, f = 200MHz 
VCB = 20V, IE = 0, f = 1MHz
min
20
7 
230 
150
typ
max
0.1
0.1
600
150
50
*2
 Pulse measurement
Unit
µA 
µA
V 
V
1
V
MHz
pF
1
 

Transistor
2SD1244
PC — Ta IC — V
1.2
) 
W
(
1.0
C
0.8
0.6
0.4
0.2
Collector power dissipation  P
0
)
10
V
(
3
CE(sat)
1
0.3
0.1
0.03
0.01
0.003
0.001
Collector to emitter saturation voltage  V
0.01 0.1 1 100.03 0.3 3
Printed circut board: Copper 
foil area of 1cm 
the board thickness of 1.7mm 
for the collector portion.
0 16040 12080 14020 10060
2
 or more, and
Ambient temperature  Ta  (˚C
V
— I
CE(sat) 
Ta=75˚C
25˚C
C
IC/IB=30
–25˚C
Collector current  IC  (A
)
)
CE
2.4
2.0
) 
A
(
1.6
C
1.2
0.8
Collector current  I
0.4
0
0 2.42.01.60.4 1.20.8
Ta=25˚C
IB=7mA
6mA
5mA 
4mA
3mA
2mA
1mA
Collector to emitter voltage  VCE  (V
V
 — I
BE(sat)
100
) 
V
(
30
BE(sat)
10
3
1
0.3
0.1
0.03
Base to emitter saturation voltage  V
0.01
0.01 0.1 1 100.03 0.3 3
Ta=–25˚C
Collector current  IC  (A
C
IC/IB=30
25˚C
75˚C
)
IC — V
6
VCE=2V
5
) 
A
(
4
C
3
2
Collector current  I
1
0
02.01.60.4 1.20.8
)
Base to emitter voltage  VBE  (V
hFE — I
600
FE
500
400
300
200
100
Forward current transfer ratio  h
0
0.01 0.1 1 100.03 0.3 3
Collector current  IC  (A
Ta=75˚C
Ta=75˚C
25˚C
–25˚C
BE
25˚C
–25˚C
)
C
=2V
V
CE
)
400
350
) 
MHz
300
(
T
250
200
150
100
Transition frequency  f
50
0
– 0.01
– 0.1 –1 –10
– 0.03
Emitter current  IE  (A
2
fT — I
E
– 0.3 –3
VCB=6V 
Ta=25˚C
)
) 
pF
(
Cob — V
100
80
ob
60
40
20
CB
Collector output capacitance  C
0
1 3 10 30 100
Collector to base voltage  VCB  (V
IE=0 
f=1MHz 
Ta=25˚C
) 
A
(
Collector current  I
)
Area of safe operation (ASO)
100
30
I
CP
10
C
I
C
3
1
0.3
0.1
0.03
0.01
0.1 1 10 1000.3 3 30
Collector to emitter voltage  VCE  (V
t=1s
Single pulse 
Ta=25˚C
t=10ms
)