BD442 Equivalent & Substitute Parts

Part Overview

The BD442 is a PNP bipolar junction transistor manufactured by STMicroelectronics, rated for 80 V collector-emitter breakdown voltage and 4 A maximum collector current in a Through Hole SOT-32 package. The device is classified as obsolete, necessitating identification of active equivalent components for continued circuit implementation and procurement. Substitute parts must maintain electrical performance characteristics and mechanical compatibility within the specified parameter ranges.

Substiute Parts

BD442

STMicroelectronicsIn Stock: 2396BD442 Datasheet

Current PartRFQ

BD442G

onsemiIn Stock: 1552BD442G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD442 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor polarity: PNP configuration
• Maximum collector current: 4 A minimum
• Collector-emitter breakdown voltage: 80 V minimum
• Vce saturation: 800 mV maximum at specified base and collector currents
• Collector cutoff current: 100 µA maximum
• DC current gain (hFE): 40 minimum at 500 mA, 1 V
• Maximum power dissipation: 36 W minimum

Mechanical Equivalence Criteria:

• Mounting type: Through Hole
• Package compatibility: TO-225AA or TO-126-3
• RoHS3 compliance required

The BD442G from onsemi satisfies all specified electrical parameters and maintains mechanical compatibility through equivalent package designation, enabling direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The BD442G from onsemi is the direct equivalent substitute for the obsolete BD442 from STMicroelectronics. Both components are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for electronic component procurement.

The BD442G maintains active product status, ensuring continued availability and supply chain reliability. All electrical parameters, including collector current, breakdown voltage, saturation voltage, and power dissipation, are equivalent or superior to the original BD442 specification.

Mechanical compatibility is confirmed through identical package designation (TO-225AA, TO-126-3) and Through Hole mounting type, permitting direct board-level substitution without circuit redesign or PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the BD442G replace the BD442 in existing circuit designs?

A: Yes. The BD442G satisfies all electrical and mechanical parameters specified for the BD442. Direct substitution is permissible without circuit modification.

Q: What is the primary reason for substituting the BD442?

A: The BD442 is classified as obsolete. The BD442G provides an active, equivalent alternative for continued procurement and circuit implementation.

Q: Are there package compatibility concerns between BD442 and BD442G?

A: No. Both components use identical package designations (TO-225AA, TO-126-3) and Through Hole mounting, ensuring mechanical and electrical compatibility on PCB layouts.

Q: Do both components meet the same regulatory compliance standards?

A: Yes. Both the BD442 and BD442G are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component use.

Q: What are the critical electrical parameters for substitution validation?

A: Substitution is validated through equivalence in collector current (4 A), collector-emitter breakdown voltage (80 V), saturation voltage (800 mV), collector cutoff current (100 µA), and DC current gain (40 minimum). All parameters are matched between the BD442 and BD442G.

Q: Is the BD442G available in the same packaging options as the BD442?

A: Yes. The BD442G is supplied in TO-126 package format, which corresponds to the TO-126-3 case designation compatible with BD442 circuit applications.