BD140 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The BD140 is a PNP bipolar junction transistor rated for 80 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a through-hole package. The original onsemi BD140 is classified as obsolete, creating the need for equivalent substitutes from active product lines. Substitute parts maintain identical electrical specifications while offering improved availability and compliance status. Selection of appropriate substitutes depends on matching electrical parameters, package compatibility, and application requirements.

Substiute Parts

BD140

onsemiIn Stock: 76285BD140 Datasheet

Current PartRFQ

BD140G

onsemiIn Stock: 1543BD140G Datasheet

DirectRFQ

BD14010STU

onsemiIn Stock: 2086BD14010STU Datasheet

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BD14016S

onsemiIn Stock: 2450BD14016S Datasheet

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BD14016STU

onsemiIn Stock: 1222BD14016STU Datasheet

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BD140

STMicroelectronicsIn Stock: 76250BD140 Datasheet

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BD140-16

STMicroelectronicsIn Stock: 30809BD140-16 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD140 is determined by strict equivalence in electrical performance parameters: collector current rating (1.5 A), collector-emitter breakdown voltage (80 V), saturation voltage (500 mV), and power dissipation (1.25 W). All substitute parts listed maintain these core electrical specifications. DC current gain (hFE) varies across the substitute range (40–100 @ 150mA, 2V) but remains within acceptable operating margins for PNP transistor applications. Package variants (TO-126, TO-126-3, SOT-32, SOT-32-3) are considered equivalent when mounted in through-hole configurations. Substitutes are grouped by manufacturer (onsemi and STMicroelectronics) and product status (active, last-time-buy, obsolete). RoHS3 compliance and REACH unaffected status are consistent across active substitutes.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BD140G (onsemi)

BD140G is the direct active equivalent to the obsolete onsemi BD140. It maintains identical electrical specifications and is available in the same TO-126 package. Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Alternative Recommendation: BD140 (STMicroelectronics)

The STMicroelectronics BD140 provides equivalent electrical performance in SOT-32-3 package configuration. Active product status and ROHS3 compliance support sustained supply. This option is suitable when SOT-32-3 package compatibility exists in the application.

Secondary Options: BD14010STU, BD14016S, BD14016STU (onsemi)

These variants maintain core electrical specifications with package variants (TO-126-3, SOT-32-3). BD14010STU and BD14016STU offer elevated DC current gain (63–100 @ 150mA, 2V) compared to the base specification (40 minimum). BD14016S and BD14016STU carry last-time-buy status, indicating limited future availability. Selection of these parts is appropriate only when package form factor or elevated gain characteristics align with circuit requirements.

Compliance Consideration

All active and last-time-buy substitutes are ROHS3 compliant and REACH unaffected. The original onsemi BD140 is RoHS non-compliant. Migration to compliant substitutes is necessary for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can BD140G directly replace the obsolete onsemi BD140?

A: Yes. BD140G is the active equivalent with identical electrical specifications (1.5 A, 80 V, 500 mV saturation, 40 minimum hFE) and the same TO-126 package. No circuit modifications are required.

Q: What is the difference between BD140G and BD14010STU?

A: Both are onsemi PNP transistors with identical voltage and current ratings. BD14010STU is packaged in TO-126-3 and specifies a minimum DC current gain of 63 @ 150mA, 2V, compared to 40 for BD140G. The higher gain may affect circuit biasing in applications with tight gain tolerance requirements.

Q: Are STMicroelectronics BD140 and BD140-16 interchangeable with onsemi BD140G?

A: Electrically, yes. All three maintain 1.5 A, 80 V, and 500 mV saturation specifications. However, package differences exist: BD140G uses TO-126, while STMicroelectronics BD140 uses SOT-32-3 and BD140-16 uses SOT-32. Physical package compatibility with the PCB layout must be verified before substitution.

Q: Why do some substitutes show last-time-buy status?

A: BD14016S and BD14016STU are designated last-time-buy, indicating onsemi has announced end-of-life for these variants. Existing inventory is available, but future procurement is not guaranteed. For new designs, active-status parts (BD140G or STMicroelectronics BD140) are preferred.

Q: Does the DC current gain variation (40–100 hFE) affect circuit compatibility?

A: DC current gain affects base current requirements and switching speed in amplifier and switching circuits. Applications with fixed base bias may experience performance variation across the hFE range. Circuit designs with feedback or current-source biasing are less sensitive to gain variation.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other markets. All active substitutes (BD140G, STMicroelectronics BD140, BD140-16) are ROHS3 compliant. The original onsemi BD140 is non-compliant and unsuitable for regulated applications.

Q: Can I use BD140 in a new design, or should I select an active substitute?

A: Active substitutes are required for new designs. The original onsemi BD140 is obsolete and carries non-compliant RoHS status. BD140G (onsemi) or BD140 (STMicroelectronics) are the appropriate selections for production designs.