BC546BU Equivalent & Substitute Parts

Part Overview

The BC546BU is an NPN bipolar junction transistor (BJT) manufactured by onsemi, 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 a transition frequency of 300 MHz in a through-hole TO-92-3 package. The BC546BU is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

BC546BU

onsemiIn Stock: 1211BC546BU Datasheet

Current PartRFQ

BC546ABU

onsemiIn Stock: 5653BC546ABU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC546BU is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

• Transistor Type: NPN configuration
• Current Rating: Maximum collector current of 100 mA
• Voltage Rating: Collector-emitter breakdown voltage of 65 V
• Saturation Characteristics: Vce saturation of 600 mV at specified bias conditions
• Leakage Current: Collector cutoff current of 15 nA maximum
• Current Gain: DC current gain (hFE) minimum of 110 at 2 mA, 5 V
• Power Dissipation: Maximum power rating of 500 mW
• Frequency Response: Transition frequency of 300 MHz
• Temperature Rating: Operating junction temperature of 150 °C
• Package: Through-hole TO-92-3 configuration

Parameter Comparison

Engineering Selection Recommendations

The BC546ABU is a direct parametric equivalent to the BC546BU across all specified electrical and mechanical characteristics. The primary distinction between these components is product status: the BC546BU is classified as obsolete, while the BC546ABU maintains active status with onsemi.

Selection of the BC546ABU is supported by the following factors:

• Electrical Equivalence: All electrical parameters, including current ratings, voltage ratings, gain characteristics, and frequency response, are identical.
• Package Compatibility: Both devices utilize the TO-92-3 through-hole package, ensuring mechanical and thermal compatibility in existing PCB layouts.
• Regulatory Compliance: Both components maintain REACH Unaffected status and EAR99 export classification.
• Supply Continuity: The BC546ABU is available in active production with documented inventory, addressing the obsolescence of the BC546BU.
• Compliance Status: The BC546ABU is RoHS3 compliant, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the BC546ABU be used as a direct replacement for the BC546BU in existing designs?

A: Yes. The BC546ABU is electrically and mechanically equivalent to the BC546BU. All critical parameters—collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, and frequency response—are identical. The TO-92-3 package is unchanged, permitting direct substitution without PCB modification.

Q: What is the primary reason for substituting the BC546BU?

A: The BC546BU is classified as obsolete. The BC546ABU provides equivalent functionality with active production status and current availability, ensuring long-term supply reliability.

Q: Are there any compliance differences between the BC546BU and BC546ABU?

A: Both components maintain REACH Unaffected status and EAR99 export classification. The BC546ABU is additionally certified as RoHS3 compliant, meeting current environmental standards.

Q: Does the TO-92-3 package remain the same for both parts?

A: Yes. Both the BC546BU and BC546ABU utilize the TO-92-3 through-hole package. Pin configuration, lead spacing, and thermal characteristics are identical.

Q: Are there differences in moisture sensitivity between these components?

A: The BC546BU specifies Moisture Sensitivity Level (MSL) 1 (Unlimited). The BC546ABU lists MSL as Not Applicable. Both designations indicate minimal moisture-related risk during standard handling and storage.

Q: What inventory status should be considered when selecting between these parts?

A: The BC546BU has 1138 pieces in stock with obsolete status. The BC546ABU has 5556 pieces in stock with active status. For new designs and long-term applications, the BC546ABU is the preferred selection.