HIT 2SC4784 Datasheet
2SC4784
Silicon NPN Epitaxial
Application
VHF / UHF wide band amplifier
Features
• High gain bandwidth product
fT = 10 GHz Typ.
• High gain, low noise figure
PG = 15.0 dB Typ, NF = 1.2 dB Typ at f = 900 MHz
Outline
CMPAK
3
1
2
1. Emitter
2. Base
3. Collector
2SC4784
Absolute Maximum Ratings (Ta = 25°C)
Item Symbol Ratings Unit
Collector to base voltage V
Collector to emitter voltage V
Emitter to base voltage V
Collector current I
Collector power dissipation P
CBO
CEO
EBO
C
C
Junction temperature Tj 150 °C
Storage temperature Tstg –55 to +150 °C
Electrical Characteristics (Ta = 25°C)
Item Symbol Min Typ Max Unit Test conditions
Collector cutoff current I
Emitter cutoff current I
DC current transfer ratio h
CBO
I
CEO
EBO
FE
Collector output capacitance Cob — 0.45 0.8 pF VCB = 5 V, IE = 0, f = 1 MHz
Gain bandwidth product f
T
Power gain PG 12.0 15.0 — dB VCE = 5 V, IC = 10 mA,
Noise figure NF — 1.2 2.5 dB VCE = 5 V, IC = 5 mA,
Note: Marking is “YA–”.
——10µAVCB = 15 V, IE = 0
——1 mAV
——10µAVEB = 1.5 V, IC = 0
50 120 250 VCE = 5 V, IC = 10 mA
7.0 10.0 — GHz VCE = 5 V, IC = 10 mA
15 V
8V
1.5 V
20 mA
100 mW
= 8 V, RBE = ∞
CE
f = 900 MHz
f = 900 MHz
Attention: This is electrostatic sensitve device.
2
Maximum Collector Dissipation Curve
120
(mW)
100
C
80
200
FE
160
120
2SC4784
DC Current Transfer Ratio
vs. Collector Current
V = 5V
CE
60
40
20
Collector Power Dissipation P
0 50 100 150
Ambient Temperature Ta (°C)
Gain Bandwidth Product
vs. Collector Current
12
V = 5 V
CE
10
T
8
6
V = 1 V
CE
4
2
Gain Bandwidth Product f (GHz)
0
12 51020 50
Collector Current I (mA)
C
80
V = 1V
CE
40
DC Current Transfer Ratio h
0
0.1
0.2 0.5 1 2
Collector Current I (mA)
5
10 20 50
C
Collector Output Capacitance vs.
Collector to Base Voltage
0.56
I = 0
E
0.52
f = 1 MHz
0.48
0.44
0.40
0.36
Collector Output Capacitance Cob (pF)
0.5
1
Collector to Base Voltage V (V)
2
51020
CB
3
2SC4784
Power Gain vs. Collector Current
20
f = 900 MHz
16
V = 5V
CE
12
8
4
Power Gain PG (dB)
0
0.3
1 3 10 30
Collector Current I (mA)
V = 1V
CE
C
Noise Figure vs. Collector Current
5
f = 900 MHz
4
3
V = 5V
CE
2
Noise Figure NF (dB)
1
V = 1V
CE
0
0.3
1 3 10 30
Collector Current I (mA)
C
4
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