BC546-AP Equivalent & Substitute Parts

Part Overview

The BC546-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This transistor operates at a maximum collector voltage of 65 V with a collector current rating of 100 mA and a maximum power dissipation of 625 mW. The device is housed in a Through Hole TO-92 package and features a transition frequency of 300 MHz, making it suitable for low-frequency to moderate-frequency circuit applications. The BC546-AP maintains Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

BC546-AP

Micro Commercial CoIn Stock: 1075BC546-AP Datasheet

Current PartRFQ

BC546BTA

onsemiIn Stock: 2545BC546BTA Datasheet

DirectRFQ

BC546BTF

onsemiIn Stock: 7773BC546BTF Datasheet

SimilarRFQ

BC546CTA

onsemiIn Stock: 62975BC546CTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BC546-AP are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Primary Matching Parameters:

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 65 V
• Current - Collector (Ic) (Max): 100 mA
• Frequency - Transition: 300 MHz
• Mounting Type: Through Hole
• Package / Case: TO-92-3

Secondary Compatibility Parameters:

• DC Current Gain (hFE) (Min): 200 or greater @ 2mA, 5V
• Operating Temperature Range: Maximum junction temperature of 150°C or higher
• RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical primary electrical ratings and package specifications. Variations in maximum power dissipation (625 mW for BC546-AP versus 500 mW for substitutes) and Vce saturation characteristics are noted but do not preclude substitution in applications where the substitute ratings are sufficient. The BC546BTA, BC546BTF, and BC546CTA are all manufactured by onsemi and share the BC546 base product number, confirming their design compatibility with the BC546-AP.

Parameter Comparison

Engineering Selection Recommendations

BC546BTA and BC546BTF Selection: The BC546BTA and BC546BTF are direct substitutes for the BC546-AP. Both parts are manufactured by onsemi, maintain Active product status, and are RoHS3 compliant. These parts are electrically equivalent with respect to collector voltage, collector current, and transition frequency. The maximum power dissipation is reduced to 500 mW compared to the BC546-AP's 625 mW; therefore, applications requiring the full 625 mW dissipation capacity should be evaluated for thermal margin. The Vce saturation specification of 600 mV (versus 300 mV for the BC546-AP) indicates slightly higher saturation voltage; circuits sensitive to saturation voltage should account for this difference. Both parts are available in Cut Tape packaging and demonstrate high inventory availability (2509 and 7706 units respectively).

BC546CTA Selection: The BC546CTA is a substitute part with enhanced DC current gain (hFE minimum of 420 @ 2mA, 5V versus 200 for the BC546-AP). This higher gain characteristic makes the BC546CTA suitable for applications where increased amplification or reduced base drive current is beneficial. The BC546CTA maintains all other electrical and mechanical specifications identical to the BC546BTA and BC546BTF. This part is manufactured by onsemi, is RoHS3 compliant, and demonstrates the highest inventory availability (62,881 units). The BC546CTA is appropriate for direct substitution in circuits where the higher current gain does not introduce stability or biasing concerns.

Compliance and Regulatory Status: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility with the BC546-AP across global markets. All parts are classified under ECCN EAR99 and HTSUS 8541.21.0075.

Frequently Asked Questions (FAQ)

Q: Can the BC546BTA, BC546BTF, or BC546CTA be used as direct replacements for the BC546-AP in existing circuit designs?

A: Yes, all three substitute parts are direct replacements from an electrical and mechanical standpoint. All parts share identical collector voltage (65 V), collector current (100 mA), transition frequency (300 MHz), and TO-92-3 package specifications. However, the reduced maximum power dissipation (500 mW versus 625 mW) and increased Vce saturation (600 mV versus 300 mV) should be verified against circuit thermal and switching requirements.

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

A: The BC546BTA and BC546BTF are electrically identical with DC current gain (hFE) minimum of 200 @ 2mA, 5V. The BC546CTA features a higher DC current gain (hFE) minimum of 420 @ 2mA, 5V. All three parts maintain identical voltage, current, frequency, and package specifications. The choice between these parts depends on circuit biasing requirements and desired amplification characteristics.

Q: Are there packaging differences between the BC546-AP and the substitute parts?

A: All parts use the TO-92-3 package with Through Hole mounting. The BC546-AP is supplied in standard packaging, while the BC546BTA, BC546BTF, and BC546CTA are supplied in Cut Tape (CT) packaging. The physical component dimensions and pin configuration are identical, ensuring mechanical compatibility in Through Hole PCB applications.

Q: What is the significance of the Vce saturation difference between the BC546-AP (300 mV) and the substitute parts (600 mV)?

A: Vce saturation represents the voltage drop across the collector-emitter junction when the transistor is fully saturated (conducting at maximum capacity). The BC546-AP exhibits lower saturation voltage (300 mV), resulting in lower power dissipation during saturation. The substitute parts exhibit higher saturation voltage (600 mV), which may increase power dissipation in saturated switching applications. Circuits designed for low-loss switching should account for this difference in thermal calculations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, the BC546BTA, BC546BTF, and BC546CTA are all RoHS3 compliant and REACH Unaffected, matching the regulatory status of the BC546-AP. All parts are suitable for applications requiring compliance with environmental and hazardous substance restrictions.

Q: Which substitute part should be selected for maximum current gain?

A: The BC546CTA provides the highest DC current gain with a minimum hFE of 420 @ 2mA, 5V, compared to 200 for the BC546BTA and BC546BTF. The BC546CTA is appropriate for applications requiring higher amplification or reduced base drive current. This part also demonstrates the highest inventory availability among the substitutes.

Q: Can the BC546-AP be substituted with parts having different maximum power ratings?

A: Substitution with lower power-rated parts (500 mW versus 625 mW) is permissible only when circuit thermal analysis confirms that the substitute part's power dissipation rating is not exceeded during normal operation. Applications operating near the 625 mW limit should be re-evaluated with the 500 mW substitute rating to ensure adequate thermal margin.