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BF257
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BF257

SKU: BF257
BF257 is a silicon NPN bipolar transistor for high-voltage video amplifier and output stages. Supplied in a TO-39 metal case, it offers VCEO/VCBO of 160 V, VEBO 5 V, collector current 100 mA (peak 200 mA), 5 W power dissipation and 90 MHz transition frequency.
Price:
£5.75 Inc. VAT (£4.79 Ex. VAT)
£5.75 Inc. VAT (£4.79 Ex. VAT)
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Datasheet
BF257 Datasheet
Product specifications
Type Transistor Silicon NPN
Case TO39
Manufacturer ST Microelectronics - STM
Vbr CBO 160
Vbr CEO 160
Max. PD (W) 5.0
Min hFE 25
Ic Max. (A) 100m
@Ic (test) (A) 30m
Icbo Max. @Vcb Max. (A) 50n
Polarity NPN
Derate Above 25°C 28m
Trans. Freq (Hz) Min. 90M
Oper. Temp (°C) Max. 175
@VCE (V) 10
Pinout Equivalence Number 3-12
Surface Mounted Yes/No NO
Maximum Collector Power Dissipation (Pc) 0.5 W
Maximum Collector-Base Voltage |Vcb| 160 V
Maximum Collector-Emitter Voltage |Vce| 160 V
Maximum Emitter-Base Voltage |Veb| 5 V
Maximum Collector Current |Ic max| 0.1 A
Max. Operating Junction Temperature (Tj) 125 °C
Collector Capacitance (Cc) 7 pF
Transition Frequency (ft): 55 MHz
Forward Current Transfer Ratio (hFE), MIN 25
SKU 79868
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