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BC637; BCP55; BCX55
60 V, 1 A NPN medium power transistors
Rev. 07 -- 25 June 2007 Product data sheet

1. Product profile

1.1 General description
NPN medium power transistor series.

Table 1. Product overview
Type number[1] Package PNP complement
NXP JEITA JEDEC
BC637[2] SOT54 SC-43A TO-92 BC638
BCP55 SOT223 SC-73 - BCP52
BCX55 SOT89 SC-62 TO-243 BCX52

[1] Valid for all available selection groups.
[2] Also available in SOT54A and SOT54 variant packages (see Section 2).

1.2 Features
I High current
I Two current gain selections
I High power dissipation capability

1.3 Applications
I Linear voltage regulators
I Low-side switches
I MOSFET drivers
I Amplifiers

1.4 Quick reference data
Table 2. Quick reference data
Symbol Parameter Conditions Min Typ Max Unit
VCEO collector-emitter voltage open base - - 60 V
IC collector current - - 1 A
ICM peak collector current single pulse; tp 1 ms - - 1.5 A
hFE DC current gain VCE = 2 V; IC = 150 mA 63 - 250
hFE selection -10 VCE = 2 V; IC = 150 mA 63 - 160
hFE selection -16 VCE = 2 V; IC = 150 mA 100 - 250
NXP Semiconductors BC637; BCP55; BCX55
60 V, 1 A NPN medium power transistors

2. Pinning information
Table 3. Pinning
Pin Description Simplified outline Symbol
SOT54
1 base
2
2 collector
3 emitter 1 1
2
3
3
001aab347
sym056

SOT54A
1 base
2
2 collector
3 emitter 1 1
2
3 3
001aab348
sym056

SOT54 variant
1 base
2
2 collector
3 emitter 1 1
2
3
3
001aab447
sym056

SOT223
1 base
4 2, 4
2 collector
3 emitter 1
4 collector
1 2 3 3
sym016

SOT89
1 emitter
2
2 collector
3 base 3

1
3 2 1 sym042

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