BC548C A1G Equivalent & Substitute Parts

Part Overview

The BC548C A1G is a bipolar NPN transistor manufactured by Taiwan Semiconductor Corporation, designed for general-purpose switching and amplification applications. This device operates at a maximum collector voltage of 30 V with a collector current rating of 100 mA and dissipates up to 500 mW. The BC548C A1G is packaged in a TO-92 through-hole configuration, suitable for through-hole PCB assembly.

The BC548C A1G carries an obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term product support and repair operations.

Substiute Parts

BC548C A1G

Taiwan Semiconductor CorporationIn Stock: 1136BC548C A1G Datasheet

Current PartRFQ

BC549CTA

onsemiIn Stock: 35783BC549CTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC548C A1G is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters:

• Transistor type (NPN)
• Maximum collector current (100 mA)
• Maximum collector-emitter breakdown voltage (30 V)
• Minimum DC current gain (420 @ 2mA, 5V)
• Maximum power dissipation (500 mW)
• Maximum collector cutoff current (15 nA)

Mechanical Parameters:

• Mounting type (Through Hole)
• Package type (TO-92-3)

Compliance Parameters:

• RoHS3 compliance
• REACH unaffected status

The BC549CTA meets all specified electrical and mechanical requirements and maintains full compliance with applicable regulatory standards. This substitute is classified as a direct functional equivalent for the BC548C A1G.

Parameter Comparison

Engineering Selection Recommendations

The BC549CTA is a direct substitute for the BC548C A1G based on electrical and mechanical parameter equivalence. The BC549CTA carries an active product status, ensuring ongoing availability and supply chain continuity. Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and legacy support applications.

The BC549CTA is manufactured by onsemi and is available in cut tape packaging with significantly higher inventory levels (35,685 pieces in stock) compared to the obsolete BC548C A1G. The BC549CTA provides identical electrical performance across all specified operating conditions and is pin-compatible with the BC548C A1G in TO-92-3 through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can the BC549CTA be used as a direct replacement for the BC548C A1G in existing designs?

A: Yes. The BC549CTA meets all electrical specifications and mechanical requirements of the BC548C A1G. Both devices are NPN transistors with identical maximum ratings for collector current (100 mA), collector-emitter breakdown voltage (30 V), power dissipation (500 mW), and DC current gain (420 @ 2mA, 5V). The TO-92-3 package pinout is identical, enabling direct PCB substitution without circuit modification.

Q: Are there any compliance differences between the BC548C A1G and BC549CTA?

A: No. Both devices are ROHS3 compliant and REACH unaffected. Regulatory compliance is maintained across both parts.

Q: What is the primary advantage of selecting the BC549CTA over the BC548C A1G?

A: The BC549CTA carries an active product status with robust supply availability. The BC548C A1G is obsolete, making long-term sourcing difficult. The BC549CTA ensures design continuity and supports ongoing production requirements.

Q: Are the operating temperature ranges equivalent?

A: The BC548C A1G operates from -65°C to 150°C. The BC549CTA operates up to 150°C. For applications requiring operation below 0°C, the BC548C A1G specification should be verified against actual circuit requirements. For standard industrial and consumer applications operating above 0°C, both devices are equivalent.

Q: Is the packaging format identical between these two parts?

A: Yes. Both the BC548C A1G and BC549CTA use the TO-92-3 through-hole package with formed leads. PCB footprints and lead spacing are identical, enabling direct mechanical substitution.