BC548CBU Equivalent & Substitute Parts

Part Overview

The BC548CBU is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device operates at a maximum collector voltage of 30 V with a collector current rating of 100 mA and a maximum power dissipation of 500 mW. The BC548CBU is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support and procurement continuity. Active alternative parts with identical electrical and mechanical specifications are available to maintain circuit functionality and performance.

Substiute Parts

BC548CBU

onsemiIn Stock: 792BC548CBU Datasheet

Current PartRFQ

BC548CTA

Fairchild SemiconductorIn Stock: 1783BC548CTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC548CBU is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

• Transistor Type: NPN configuration
• Maximum Collector Current: 100 mA
• Maximum Collector-Emitter Breakdown Voltage: 30 V
• Saturation Voltage: 600 mV @ 5mA, 100mA
• Collector Cutoff Current: 15 nA (ICBO)
• DC Current Gain (hFE): Minimum 420 @ 2mA, 5V
• Maximum Power Dissipation: 500 mW
• Transition Frequency: 300 MHz
• Maximum Operating Temperature: 150°C
• Package Type: TO-92-3 Through Hole

The BC548CTA manufactured by Fairchild Semiconductor meets all specified electrical and mechanical parameters and is classified as an active product, providing a direct functional equivalent for the obsolete BC548CBU.

Parameter Comparison

Engineering Selection Recommendations

The BC548CTA is a direct electrical and mechanical equivalent to the BC548CBU. The primary distinction between these components is product status: the BC548CBU is classified as obsolete, while the BC548CTA is active and currently manufactured by Fairchild Semiconductor. Both devices share identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and frequency response.

For new designs and ongoing procurement, the BC548CTA is the appropriate selection due to its active product status and assured long-term availability. The BC548CTA maintains full compatibility with existing circuit designs originally specified for the BC548CBU, requiring no circuit modifications or re-qualification. Both components carry the same ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the BC548CTA be used as a direct replacement for the BC548CBU in existing circuits?

A: Yes. The BC548CTA is electrically and mechanically identical to the BC548CBU across all specified parameters. No circuit modifications are required for substitution.

Q: What is the primary reason for substituting the BC548CBU?

A: The BC548CBU is classified as obsolete. The BC548CTA provides an active, currently manufactured equivalent with identical electrical and mechanical specifications.

Q: Are the package types compatible between BC548CBU and BC548CTA?

A: Yes. Both components use the TO-92-3 (TO-226AA) through-hole package with identical pin configuration and lead spacing.

Q: Do the electrical specifications differ between these two parts?

A: No. The BC548CTA and BC548CBU share identical specifications for collector current, breakdown voltage, saturation voltage, current gain, power dissipation, transition frequency, and operating temperature.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both components carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications.

Q: What is the inventory status of the BC548CTA?

A: The BC548CTA is available as an active product with 1749 pieces in stock as new original inventory.