BC546ATA Equivalent & Substitute Parts

Part Overview

The BC546ATA is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 65 V, and a power dissipation rating of 500 mW in a Through Hole TO-92-3 package. The BC546ATA is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

BC546ATA

onsemiIn Stock: 1003BC546ATA Datasheet

Current PartRFQ

BC546BTA

onsemiIn Stock: 2545BC546BTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC546ATA is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN
• Current - Collector (Ic) Max: 100 mA
• Voltage - Collector Emitter Breakdown (Max): 65 V
• Vce Saturation (Max): 600 mV @ 5mA, 100mA
• Current - Collector Cutoff (Max): 15 nA
• Power - Max: 500 mW
• Frequency - Transition: 300 MHz
• Operating Temperature: 150°C
• Package / Case: TO-92-3
• RoHS Status: ROHS3 Compliant

The BC546BTA meets all critical electrical specifications and maintains identical package configuration, making it a direct substitute. The primary distinction between these parts is product status and DC current gain specification, which does not affect functional substitution in applications where the BC546ATA was originally specified.

Parameter Comparison

Engineering Selection Recommendations

The BC546BTA is the direct substitute for the BC546ATA. Both parts are manufactured by onsemi and share identical electrical ratings and package specifications. The BC546BTA carries Active product status, ensuring continued availability and supply chain support, whereas the BC546ATA is classified as Obsolete.

Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for new designs and legacy system maintenance. The BC546BTA is supplied in Cut Tape packaging, which is standard for active production components.

The DC current gain (hFE) specification differs between the two parts (110 minimum for BC546ATA versus 200 minimum for BC546BTA). This difference reflects manufacturing grade classification and does not prevent functional substitution in circuits designed for the BC546ATA, as the higher gain of the BC546BTA remains within acceptable operating parameters for standard switching and amplification applications.

Frequently Asked Questions (FAQ)

Q: Can the BC546BTA directly replace the BC546ATA in existing designs?

A: Yes. The BC546BTA meets all electrical specifications and package requirements of the BC546ATA. Both parts are NPN transistors with identical maximum ratings for collector current (100 mA), breakdown voltage (65 V), power dissipation (500 mW), and operating temperature (150°C). The TO-92-3 package pinout is identical, enabling direct board-level substitution.

Q: What is the significance of the different DC current gain specifications?

A: The BC546ATA specifies a minimum DC current gain (hFE) of 110 at 2 mA and 5 V, while the BC546BTA specifies 200 under the same conditions. The BC546BTA's higher gain does not create incompatibility; it represents a higher-grade device. Circuits designed for the BC546ATA will function with the BC546BTA without modification, as the higher gain provides improved performance margin.

Q: Why is the BC546ATA listed as Obsolete?

A: The BC546ATA is classified as Obsolete by onsemi, indicating it is no longer in active production. The BC546BTA is the active equivalent and is the recommended part for new designs and ongoing procurement.

Q: Are there packaging differences between BC546ATA and BC546BTA?

A: Both parts use the TO-92-3 package with Through Hole mounting. The BC546BTA is supplied in Cut Tape packaging format, which is standard for active production components. This does not affect electrical performance or board-level compatibility.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the BC546ATA and BC546BTA are ROHS3 Compliant and REACH Unaffected, satisfying current regulatory requirements for electronic components in most jurisdictions.