STBV42-AP Equivalent & Substitute Parts

Part Overview

The STBV42-AP is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 400 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is packaged in a TO-92AP through-hole configuration with a maximum power dissipation of 1 W. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging variations.

Substiute Parts

STBV42-AP

STMicroelectronicsIn Stock: 17540STBV42-AP Datasheet

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BUJ100,126

WeEn SemiconductorsIn Stock: 940BUJ100,126 Datasheet

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BUJ100LR,126

WeEn SemiconductorsIn Stock: 746BUJ100LR,126 Datasheet

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BUJ100LR,412

WeEn SemiconductorsIn Stock: 5183BUJ100LR,412 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STBV42-AP is determined by equivalence across the following critical electrical parameters: transistor type (NPN), maximum collector current (1 A), maximum collector-emitter breakdown voltage (400 V), saturation voltage characteristics, collector cutoff current, DC current gain specifications, and maximum power dissipation. All substitute parts must operate within the same temperature range (150°C TJ maximum) and utilize compatible through-hole TO-92-3 packaging. Packaging format variations (Cut Tape, Tape & Box, Bulk) do not affect electrical substitution but reflect inventory and supply chain considerations. RoHS compliance status and moisture sensitivity classification are secondary selection criteria based on application requirements and environmental exposure.

The three WeEn Semiconductors alternatives—BUJ100,126; BUJ100LR,126; and BUJ100LR,412—satisfy the primary electrical substitution criteria. These parts maintain the 400 V breakdown voltage and 1 A collector current ratings. Differences in maximum power dissipation (2 W or 2.1 W versus 1 W) and collector cutoff current specifications represent enhanced performance margins rather than incompatibilities. All substitute parts are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

All three WeEn Semiconductors alternatives are suitable for direct substitution of the obsolete STBV42-AP in applications requiring NPN transistors with 400 V breakdown voltage and 1 A collector current ratings. The active product status of BUJ100,126; BUJ100LR,126; and BUJ100LR,412 ensures long-term availability and manufacturing continuity.

BUJ100LR,126 and BUJ100LR,412 are preferred selections due to exact electrical parameter matching with the STBV42-AP, including saturation voltage (1.5V @ 250mA, 750mA), collector cutoff current (1mA), and DC current gain (10 @ 400mA, 5V). These parts provide enhanced power dissipation capability (2.1 W) compared to the original specification (1 W), offering improved thermal margin. The distinction between BUJ100LR,126 (Tape & Box packaging) and BUJ100LR,412 (Bulk packaging) reflects supply chain and inventory management preferences without affecting electrical performance.

BUJ100,126 presents an alternative with slightly different saturation voltage characteristics (1V @ 150mA, 750mA) and reduced collector cutoff current (100µA). This part maintains the 400 V breakdown voltage and 1 A collector current specifications with 2 W maximum power dissipation. Selection of BUJ100,126 is appropriate for applications where the lower saturation voltage and cutoff current specifications provide operational advantages.

All substitute parts comply with RoHS regulations and maintain MSL 1 (Unlimited) moisture sensitivity classification, matching the environmental compliance profile of the original STBV42-AP.

Frequently Asked Questions (FAQ)

Q: Can BUJ100,126 be used as a direct replacement for STBV42-AP?

A: BUJ100,126 is electrically compatible for applications requiring NPN transistors with 400 V breakdown voltage and 1 A collector current. The saturation voltage specification differs (1V @ 150mA, 750mA versus 1.5V @ 250mA, 750mA), and collector cutoff current is lower (100µA versus 1mA). These differences do not prevent substitution but reflect distinct performance characteristics that may benefit specific circuit designs.

Q: What is the difference between BUJ100LR,126 and BUJ100LR,412?

A: BUJ100LR,126 and BUJ100LR,412 are electrically identical, with identical electrical parameters including saturation voltage, collector cutoff current, and DC current gain. The distinction is packaging format: BUJ100LR,126 is supplied in Tape & Box format, while BUJ100LR,412 is supplied in Bulk format. Selection depends on inventory management and supply chain requirements rather than electrical performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. BUJ100,126; BUJ100LR,126; and BUJ100LR,412 are all RoHS compliant, matching the ROHS3 compliance status of the STBV42-AP. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification.

Q: Can these substitute parts handle the same power dissipation as the STBV42-AP?

A: The substitute parts exceed the original power dissipation specification. STBV42-AP is rated for 1 W maximum power dissipation, while BUJ100,126 is rated for 2 W and BUJ100LR,126 and BUJ100LR,412 are rated for 2.1 W. This enhanced capability provides additional thermal margin and does not create compatibility issues.

Q: Are the TO-92-3 packages mechanically compatible with the original TO-92AP package?

A: Yes. All substitute parts utilize TO-226-3 and TO-92-3 (TO-226AA) formed leads packaging, which is mechanically compatible with the original STBV42-AP TO-92AP configuration. Through-hole mounting characteristics are identical across all parts.

Q: What is the inventory status of these substitute parts?

A: BUJ100,126 has 838 units in stock, BUJ100LR,126 has 715 units in stock, and BUJ100LR,412 has 5100 units in stock. All parts are classified as active products with current manufacturing status, ensuring ongoing availability.