BF421
SMALL SIGNAL PNP TRANSISTOR
PRELIMINARY DATA
■SILICO N EP ITA X IAL PLANA R PNP HIGH
VOLTAGE TRANSISTOR
■TO-92 PACKAGE SUITABLE FOR
TH ROUGH- HOLE PCB ASSEMBLY
■THE NP N COMP LE ME NT ARY T Y PE I S
BF420
APPLICATIONS
■VIDE O AMP LIF IER CIRCUI T S (RGB
CATHO DE CURRENT CONTROL)
■TELEPHONE WIRELINE INTERFACE (HOOK
SWITCHES, DIALER CIRCUITS)
®
INTERNAL SCHEMATI C DIAG RAM
February 2003
A BSO LUT E MAX IMU M RATIN GS
Symbol Parameter Value Unit
VCBO Collector-Base Voltage (IE = 0) -300 V
VCEO Collector-Emitter Voltage (IB = 0) -300 V
VEBO Emitter-Base Voltage (IC = 0) -5 V
ICCollector Current -500 mA
ICM Collector Peak Current (tp < 5ms) -600 mA
Ptot Total Dissipation at TC = 25 oC 830 mW
Tstg Storage Temperature -65 to 150 oC
TjMax. Operating Junction Temperature 150 oC
Ordering Code Marking Package / Shipment
BF421 BF421 TO-92 / Bulk
BF421-AP BF421 TO-92 / Ammopack
TO-92
Bulk TO-92
Ammopack
1/5
THERMAL DATA
Rthj-amb •
Rthj-Case • Thermal Resistance Junction-Ambient Max
Thermal Resistance Junction-Case Max 150
50
oC/W
oC/W
ELE CT RICAL CHAR ACT ERISTI CS (Tcase = 25 oC unless otherwis e specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ICBO Collector Cut-off
Current (IE = 0) VCB = -200 V
VCB = -200 V TC = 150 oC
VCB = -300 V
-10
-10
-100
nA
µA
µA
IEBO Emitter Cut-off Current
(IC = 0) VEB = -5 V -50 nA
V(BR)CEO∗Collector-Emitter
Breakdown Voltage
(IB = 0)
IC = -10 mA -300 V
V(BR)CBO Collector-Base
Breakdown Voltage
(IE = 0)
IC = -10 µA-300 V
V(BR)EBO Emitter-Base
Breakdown Voltage
(IC = 0)
IE = -100 µA-5 V
VCE(sat)∗Collector-Emitter
Saturation Voltage IC = -30 mA IB = -5 mA -0.6 V
VBE(sat)∗Base-Emitter
Saturation Voltage IC = -30 mA IB = -5 mA -1.2 V
hFE∗DC Current Gain IC = -25 mA VCE = -20 V 50
fTTransition Frequency I C = -10 m A VCE = -10 V f =100MHz 60 MHz
CRE Reverse Capacitance I E = 0 VCB = -30 V f = 1MHz 1.6 pF
∗ Pulsed: Pulse duration ≤ 300 µs, duty cycle ≤ 2 %
BF421
2/5
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.32 4.95 0.170 0.195
b 0.36 0.51 0.014 0.020
D 4.45 4.95 0.175 0.194
E 3.30 3.94 0.130 0.155
e 2.41 2.67 0.095 0.105
e1 1.14 1.40 0.045 0.055
L 12.70 15.49 0.500 0.609
R 2.16 2.41 0.085 0.094
S1 1.14 1.52 0.045 0.059
W 0.41 0.56 0.016 0.022
V 4 degree 6 degree 4 degree 6 degree
TO-9 2 MEC HANICAL DAT A
BF421
3/5
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A1 4.80 0.189
T 3.80 0.150
T1 1.60 0.063
T2 2.30 0.091
d 0.48 0.019
P0 12.50 12.70 12.90 0.492 0.500 0.508
P2 5.65 6.35 7.05 0.222 0.250 0.278
F1,F2 2.44 2.54 2.94 0.096 0.100 0.116
delta H -2.00 2.00 -0.079 0.079
W 17.50 18.00 19.00 0.689 0.709 0.748
W0 5.70 6.00 6.30 0.224 0.236 0.248
W1 8.50 9.00 9.25 0.335 0.354 0.364
W2 0.50 0.020
H 18.50 20.50 0.728 0.807
H0 15.50 16.00 16.50 0.610 0.630 0.650
H1 25.00 0.984
D0 3.80 4.00 4.20 0.150 0.157 0.165
t 0.90 0.035
L 11.00 0.433
I1 3.00 0.118
delta P -1.00 1.00 -0.039 0.039
TO-92 AMMOPACK SHIPMENT (Suffix"-AP") MECHANICAL DATA
BF421
4/5
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BF421
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