BC640G Equivalent & Substitute Parts

Part Overview

The BC640G is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a Through Hole TO-92 (TO-226-3) configuration and is rated for 625 mW maximum power dissipation. The BC640G is classified as an obsolete product. Identification of equivalent and substitute parts is necessary due to product discontinuation and potential supply constraints.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	500	mA
Voltage - Collector Emitter Breakdown (Max)	80	V
Power - Max	625	mW
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the BC640G is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters (Must Match or Exceed):

Transistor Type: PNP
Maximum Collector Current (Ic): 500 mA
Maximum Collector-Emitter Breakdown Voltage: 80 V
Maximum Power Dissipation: 625 mW
Operating Temperature Range: -55°C to 150°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226 family)

The MPSA56-AP manufactured by Micro Commercial Co meets all critical electrical specifications and shares identical mechanical packaging. Both devices are classified as obsolete products with unlimited moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	BC640G (onsemi)	MPSA56-AP (Micro Commercial Co)	Match Status
Transistor Type	PNP	PNP	Equivalent
Current - Collector (Ic) (Max)	500 mA	500 mA	Equivalent
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	Equivalent
Power - Max	625 mW	625 mW	Equivalent
Vce Saturation (Max)	500 mV @ 50 mA, 500 mA	250 mV @ 10 mA, 100 mA	MPSA56-AP Superior
DC Current Gain (hFE) (Min)	40 @ 150 mA, 2 V	100 @ 100 mA, 1 V	MPSA56-AP Superior
Frequency - Transition	150 MHz	50 MHz	BC640G Superior
Current - Collector Cutoff (Max)	100 nA	100 nA	Equivalent
Operating Temperature Range	-55 to 150°C	-55 to 150°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-92-3 (TO-226)	TO-92-3 (TO-226AA)	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent

Engineering Selection Recommendations

The MPSA56-AP is a direct electrical and mechanical substitute for the BC640G. Both devices are obsolete products with identical maximum ratings for collector current, collector-emitter breakdown voltage, and power dissipation. Both share the same TO-92-3 Through Hole package configuration and identical operating temperature range.

The MPSA56-AP demonstrates superior saturation voltage characteristics and higher DC current gain at specified test conditions. The BC640G exhibits higher transition frequency (150 MHz versus 50 MHz). Selection between these devices depends on application-specific requirements for switching speed versus gain and saturation performance.

Both devices carry REACH Unaffected status and EAR99 export classification. The MPSA56-AP carries RoHS3 compliance certification, whereas the BC640G compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the MPSA56-AP directly replace the BC640G in existing designs?

A: Yes. Both devices are PNP transistors with identical maximum ratings for collector current (500 mA), collector-emitter breakdown voltage (80 V), and power dissipation (625 mW). Both use the TO-92-3 Through Hole package and operate across the same temperature range (-55°C to 150°C). Pinout compatibility is maintained.

Q: What are the differences between BC640G and MPSA56-AP?

A: The primary differences are transition frequency (BC640G: 150 MHz; MPSA56-AP: 50 MHz), saturation voltage characteristics, and DC current gain specifications. The MPSA56-AP exhibits lower saturation voltage and higher current gain. Applications requiring high-speed switching may favor the BC640G, while applications prioritizing gain and saturation performance may favor the MPSA56-AP.

Q: Are both devices still in production?

A: No. Both the BC640G and MPSA56-AP are classified as obsolete products. Availability is limited to existing inventory from authorized distributors.

Q: Do package variations affect substitution?

A: Both devices use TO-92-3 packaging within the TO-226 family. The BC640G is specified as TO-226-3, TO-92-3 Long Body, while the MPSA56-AP is specified as TO-226-3, TO-92-3 with Formed Leads. Both configurations are mechanically compatible with standard TO-92 footprints and through-hole PCB layouts.

Q: What compliance certifications apply to these devices?

A: Both devices carry REACH Unaffected status and EAR99 export classification. The MPSA56-AP is RoHS3 compliant. Both devices have unlimited moisture sensitivity level (MSL 1).

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