BC372G Equivalent & Substitute Parts

Part Overview

The BC372G is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 100 V collector-emitter breakdown voltage rating and 1 A maximum collector current capability in a Through Hole TO-92 package. The BC372G is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Maximum Collector Current (Ic)	1	A
Collector-Emitter Breakdown Voltage (Max)	100	V
Maximum Power Dissipation	625	mW
DC Current Gain (hFE Min)	10000	@ 100mA, 5V
Transition Frequency	200	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package	TO-92-3 (TO-226)	—

Substitute Part Grouping Explanation

Substitution of the BC372G is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor topology: NPN Darlington configuration
Collector-emitter breakdown voltage: 100 V minimum
Maximum collector current: equal to or greater than 1 A
DC current gain (hFE): minimum 10000 at specified test conditions
Power dissipation capability: 625 mW or greater
Operating temperature range: -55°C to 150°C or wider

Mechanical Compatibility Criteria:

Package type: TO-92-3 (TO-226) Through Hole
Pin configuration: standard three-pin Darlington layout

The MPSA29 satisfies the core electrical requirements for NPN Darlington operation with identical voltage rating and power dissipation. However, the MPSA29 exhibits reduced maximum collector current (800 mA versus 1 A) and lower transition frequency (125 MHz versus 200 MHz), making it suitable for applications where these reduced specifications remain within design margins.

Parameter Comparison

Parameter	BC372G	MPSA29	Unit
Manufacturer	onsemi	onsemi	—
Product Status	Obsolete	Active	—
Transistor Type	NPN - Darlington	NPN - Darlington	—
Maximum Collector Current	1	0.8	A
Collector-Emitter Breakdown Voltage	100	100	V
Vce Saturation (Max)	1.1 @ 250µA, 250mA	1.5 @ 100µA, 100mA	V
DC Current Gain (hFE Min)	10000 @ 100mA, 5V	10000 @ 100mA, 5V	—
Maximum Power Dissipation	625	625	mW
Transition Frequency	200	125	MHz
Operating Temperature Range	-55 to 150	-55 to 150	°C
Package / Case	TO-92-3 (TO-226)	TO-92-3 (TO-226AA)	—
Mounting Type	Through Hole	Through Hole	—
REACH Status	REACH Unaffected	REACH Unaffected	—
ECCN	EAR99	EAR99	—

Engineering Selection Recommendations

BC372G (Obsolete): The BC372G is classified as obsolete and no longer in active production. While 972 units remain in inventory, this part number should not be selected for new designs or long-term procurement strategies.

MPSA29 (Active Substitute): The MPSA29 is an active production component from onsemi with 2869 units in current inventory. This device is RoHS3 compliant and maintains REACH Unaffected status, aligning with modern regulatory requirements. The MPSA29 is suitable for applications where the reduced maximum collector current (800 mA) and transition frequency (125 MHz) specifications remain within design operating margins. Direct pin-compatible substitution is supported through the identical TO-92-3 package configuration.

Selection of the MPSA29 is appropriate for designs requiring active component status, regulatory compliance, and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MPSA29 directly replace the BC372G in existing designs?

A: Direct mechanical substitution is supported through identical TO-92-3 package pinouts. Electrical substitution requires verification that application requirements accommodate the MPSA29's reduced maximum collector current (800 mA versus 1 A) and lower transition frequency (125 MHz versus 200 MHz). Applications operating below these thresholds support direct substitution without circuit modification.

Q: What are the key electrical differences between BC372G and MPSA29?

A: Both devices share identical 100 V collector-emitter breakdown voltage, 625 mW power dissipation, and 10000 minimum DC current gain. The MPSA29 exhibits 200 mA lower maximum collector current and 75 MHz lower transition frequency. Vce saturation characteristics differ at specified test conditions, with the MPSA29 showing 1.5 V maximum versus 1.1 V for the BC372G.

Q: Are there package compatibility considerations?

A: Both the BC372G and MPSA29 utilize Through Hole TO-92-3 (TO-226) packages with standard three-pin Darlington configurations. Physical dimensions and pin spacing are compatible, supporting direct board-level substitution without PCB redesign.

Q: What is the regulatory compliance status of the MPSA29?

A: The MPSA29 is RoHS3 compliant and maintains REACH Unaffected status. Both devices carry EAR99 ECCN classification. These certifications support use in applications subject to modern environmental and export control requirements.

Q: Why is the BC372G classified as obsolete?

A: Obsolete classification indicates the BC372G is no longer in active production by onsemi. The MPSA29 serves as the active equivalent for ongoing design support and procurement requirements.

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