Low Noise Transistors
NPN Silicon
MAXIMUM RATINGS
Rating Symbol BC549 BC550 Unit
Collector–Emitter Voltage VCEO 30 45 Vdc
Collector–Base Voltage VCBO 30 50 Vdc
Emitter–Base V oltage VEBO 5.0 Vdc
Collector Current — Continuous IC100 mAdc
Total Device Dissipation @ TA = 25°C
Derate above 25°CPD625
5.0 mW
mW/°C
Total Device Dissipation @ TC = 25°C
Derate above 25°CPD1.5
12 Watt
mW/°C
Operating and Storage Junction
Temperature Range TJ, Tstg –55 to +150 °C
THERMAL CHARACTERISTICS
Characteristic Symbol Max Unit
Thermal Resistance, Junction to Ambient RJA 200 °C/W
Thermal Resistance, Junction to Case RJC 83.3 °C/W
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
Characteristic Symbol Min Typ Max Unit
OFF CHARACTERISTICS
Collector–Emitter Breakdown Voltage
(IC = 10 mAdc, IB = 0) BC549B,C
BC550B,C
V(BR)CEO 30
45 —
——
—
Vdc
Collector–Base Breakdown Voltage
(IC = 10 µAdc, IE = 0) BC549B,C
BC550B,C
V(BR)CBO 30
50 —
——
—
Vdc
Emitter–Base Breakdown Voltage
(IE = 10 Adc, IC = 0) V(BR)EBO 5.0 — — Vdc
Collector Cutoff Current
(VCB = 30 V, IE = 0)
(VCB = 30 V, IE = 0, TA = +125°C)
ICBO —
——
—15
5.0 nAdc
µAdc
Emitter Cutoff Current
(VEB = 4.0 Vdc, IC = 0) IEBO — — 15 nAdc
Semiconductor Components Industries, LLC, 2001
February, 2001 – Rev. 1 1Publication Order Number:
BC549B/D
BC549B,C
BC550B,C
CASE 29–04, STYLE 17
TO–92 (TO–226AA)
123
COLLECTOR
1
2
BASE
3
EMITTER
BC549B,C BC550B,C
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2
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) (Continued)
Characteristic Symbol Min Typ Max Unit
ON CHARACTERISTICS
DC Current Gain
(IC = 10 µAdc, VCE = 5.0 Vdc) BC549B/550B
BC549C/550C
(IC = 2.0 mAdc, VCE = 5.0 Vdc) BC549B/550B
BC549C/550C
hFE 100
100
200
420
150
270
290
500
—
—
450
800
—
Collector–Emitter Saturation Voltage
(IC = 10 mAdc, IB = 0.5 mAdc)
(IC = 10 mAdc, IB = see note 1)
(IC = 100 mAdc, IB = 5.0 mAdc, see note 2)
VCE(sat) —
—
—
0.075
0.3
0.25
0.25
0.6
0.6
Vdc
Base–Emitter Saturation Voltage
(IC = 100 mAdc, IB = 5.0 mAdc) VBE(sat) — 1.1 — Vdc
Base–Emitter On Voltage
(IC = 10 µAdc, VCE = 5.0 Vdc)
(IC = 100 µAdc, VCE = 5.0 Vdc)
(IC = 2.0 mAdc, VCE = 5.0 Vdc)
VBE(on) —
—
0.55
0.52
0.55
0.62
—
—
0.7
Vdc
SMALL–SIGNAL CHARACTERISTICS
Current–Gain — Bandwidth Product
(IC = 10 mAdc, VCE = 5.0 Vdc, f = 100 MHz) fT— 250 — MHz
Collector–Base Capacitance
(VCB = 10 Vdc, IE = 0, f = 1.0 MHz) Ccbo — 2.5 — pF
Small–Signal Current Gain
(IC = 2.0 mAdc, VCE = 5.0 V, f = 1.0 kHz) BC549B/BC550B
BC549C/BC550C
hfe 240
450 330
600 500
900
—
Noise Figure
(IC = 200 µAdc, VCE = 5.0 Vdc, RS = 2.0 kΩ, f = 1.0 kHz)
(IC = 200 µAdc, VCE = 5.0 Vdc, RS = 100 kΩ, f = 1.0 kHz) NF1
NF2—
—0.6
—2.5
10
dB
NOTES:
1. IB is value for which IC = 11 mA at VCE = 1.0 V.
2. Pulse test = 300 µs – Duty cycle = 2%.
RSin
enIDEAL
TRANSISTOR
Figure 1. Transistor Noise Model
BC549B,C BC550B,C
http://onsemi.com
3
2.0
1.5
1.0
0.2
0.3
0.4
0.6
0.8
2000.2 0.5 1.0 2.0 5.0 10 20 50 100
IC, COLLECTOR CURRENT (mAdc)
Figure 2. Normalized DC Current Gain
hFE, NORMALIZED DC CURRENT GAIN
VCE = 10 V
TA = 25°C
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.20.1 0.5 1.0 2.0 5.0 10 20 50 100
IC, COLLECTOR CURRENT (mAdc)
Figure 3. “Saturation” and “On” Voltages
V, VOLTAGE (VOLTS)
TA = 25°C
VBE(sat) @ IC/IB = 10
VBE(on) @ VCE = 10 V
VCE(sat) @ IC/IB = 10
400
20
30
40
60
80
100
200
300
0.5 1.00.7 2.0 5.0 7.0 10 20 50
IC, COLLECTOR CURRENT (mAdc)
Figure 4. Current–Gain — Bandwidth Product
fT, CURRENT-GAIN BANDWIDTH PRODUCT (MHz)
C, CAPACITANCE (pF)
10
1.0
2.0
3.0
5.0
7.0
0.4 0.6 1.0 2.0 4.0 10 20 40
VR, REVERSE VOLTAGE (VOLTS)
Figure 5. Capacitance
VCE = 10 V
TA = 25°C
TA = 25°C
Cib
Cob
rb, BASE SPREADING RESISTANCE (OHMS)
170
160
150
140
130
120 100.1 0.2 0.5 1.0 2.0 5.0
IC, COLLECTOR CURRENT (mAdc)
Figure 6. Base Spreading Resistance
VCE = 10 V
f = 1.0 kHz
TA = 25°C
BC549B,C BC550B,C
http://onsemi.com
4
PACKAGE DIMENSIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. CONTOUR OF PACKAGE BEYOND DIMENSION R
IS UNCONTROLLED.
4. DIMENSION F APPLIES BETWEEN P AND L.
DIMENSION D AND J APPLY BETWEEN L AND K
MINIMUM. LEAD DIMENSION IS UNCONTROLLED
IN P AND BEYOND DIMENSION K MINIMUM.
R
A
P
J
L
F
B
K
G
HSECTION X–X
C
V
D
N
N
XX
SEATING
PLANE
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.175 0.205 4.45 5.20
B0.170 0.210 4.32 5.33
C0.125 0.165 3.18 4.19
D0.016 0.022 0.41 0.55
F0.016 0.019 0.41 0.48
G0.045 0.055 1.15 1.39
H0.095 0.105 2.42 2.66
J0.015 0.020 0.39 0.50
K0.500 --- 12.70 ---
L0.250 --- 6.35 ---
N0.080 0.105 2.04 2.66
P--- 0.100 --- 2.54
R0.115 --- 2.93 ---
V0.135 --- 3.43 ---
1
CASE 029–04
(TO–226AA)
ISSUE AD
STYLE 17:
PIN 1. COLLECTOR
2. BASE
3. EMITTER
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