BC546B A1G Equivalent & Substitute Parts

Part Overview

The BC546B A1G is an NPN bipolar junction transistor (BJT) manufactured by Taiwan Semiconductor Corporation, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 65 V, and power dissipation rating of 500 mW in a Through Hole TO-92 package.

The BC546B A1G is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Substiute Parts

BC546B A1G

Taiwan Semiconductor CorporationIn Stock: 926BC546B A1G Datasheet

Current PartRFQ

BC546BTA

onsemiIn Stock: 2545BC546BTA Datasheet

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BC546BTF

onsemiIn Stock: 7773BC546BTF Datasheet

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BC546CTA

onsemiIn Stock: 62975BC546CTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC546B A1G is determined by electrical and mechanical parameter equivalence within the BC546 transistor family. The following criteria establish valid substitution:

Critical Matching Parameters:

• Transistor Type: NPN
• Maximum Collector Current (Ic): 100 mA
• Collector-Emitter Breakdown Voltage: 65 V
• Maximum Power Dissipation: 500 mW
• Collector Cutoff Current (ICBO): 15 nA
• Mounting Type: Through Hole
• Package Type: TO-92-3

Acceptable Variation Parameters:

• DC Current Gain (hFE): Minimum 200 @ 2mA, 5V (higher values acceptable)
• Transition Frequency: Not specified for main part; substitute parts with specified frequency are acceptable
• Operating Temperature Range: Substitute parts with maximum temperature of 150°C or higher are acceptable
• Vce Saturation: Specified in substitute parts but not in main part; presence of this specification does not preclude substitution

All substitute parts listed maintain electrical equivalence across critical parameters and are compatible with applications designed for the BC546B A1G.

Parameter Comparison

Engineering Selection Recommendations

BC546BTA and BC546BTF (onsemi)

Both BC546BTA and BC546BTF are active-status alternatives manufactured by onsemi. These parts maintain full electrical equivalence to the BC546B A1G across all critical parameters: 100 mA maximum collector current, 65 V collector-emitter breakdown voltage, 500 mW power dissipation, and TO-92-3 package configuration. Both parts are ROHS3 compliant and REACH unaffected. The BC546BTF variant has higher inventory availability (7706 units) compared to BC546BTA (2509 units).

BC546CTA (onsemi)

The BC546CTA is an active-status substitute with the highest inventory availability (62,881 units). This part meets all critical electrical parameters and maintains TO-92-3 package compatibility. The BC546CTA features a higher minimum DC current gain (420 @ 2mA, 5V) compared to the main part specification (200 @ 2mA, 5V). This elevated gain characteristic does not preclude substitution in applications designed for the BC546B A1G, as higher gain provides additional design margin. The BC546CTA is ROHS3 compliant and REACH unaffected.

All three substitute parts are suitable for direct replacement in applications originally designed for the BC546B A1G, with selection based on availability, packaging format preference (Cut Tape), and inventory requirements.

Frequently Asked Questions (FAQ)

Q: Can BC546BTA, BC546BTF, and BC546CTA be used interchangeably with BC546B A1G?

A: Yes. All three substitute parts maintain electrical equivalence across critical parameters: NPN transistor type, 100 mA maximum collector current, 65 V collector-emitter breakdown voltage, 500 mW power dissipation, 15 nA collector cutoff current, and TO-92-3 package configuration. These parts are direct functional replacements.

Q: What is the difference between BC546BTA, BC546BTF, and BC546CTA?

A: The primary differences are manufacturer inventory levels and DC current gain specification. BC546BTA and BC546BTF both specify minimum DC current gain of 200 @ 2mA, 5V, matching the main part. BC546CTA specifies a higher minimum DC current gain of 420 @ 2mA, 5V. All three parts are manufactured by onsemi and share identical electrical ratings and TO-92-3 package configuration.

Q: Does the higher DC current gain of BC546CTA affect circuit compatibility?

A: No. Higher DC current gain does not compromise compatibility with circuits designed for the BC546B A1G. The BC546CTA meets the minimum gain requirement (420 exceeds the 200 minimum specification) and maintains all other electrical parameters within specification.

Q: Are the substitute parts available in the same packaging as the BC546B A1G?

A: The BC546B A1G is specified with Through Hole mounting in TO-92-3 package. All substitute parts (BC546BTA, BC546BTF, BC546CTA) are supplied in Cut Tape (CT) packaging format but maintain identical TO-92-3 package / case configuration for Through Hole mounting. The packaging format difference refers to the supply reel configuration, not the component package itself.

Q: What is the product status significance of the substitute parts?

A: The BC546B A1G is classified as obsolete, indicating discontinued production. BC546BTA, BC546BTF, and BC546CTA are all active-status products with ongoing production and availability. Selection of active-status alternatives ensures long-term supply chain continuity and supports future production requirements.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. BC546BTA, BC546BTF, and BC546CTA are all ROHS3 compliant and REACH unaffected, matching the compliance status of the BC546B A1G.