BC638G Equivalent & Substitute Parts

Part Overview

The BC638G is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a 60 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 625 mW power dissipation in a Through Hole TO-92 package. The BC638G is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

BC638G

onsemiIn Stock: 1032BC638G Datasheet

Current PartRFQ

KSP2907ABU

Fairchild SemiconductorIn Stock: 45150KSP2907ABU Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC638G is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor Type: PNP configuration required
• Voltage - Collector Emitter Breakdown (Max): 60 V minimum
• Current - Collector (Ic) (Max): 500 mA or greater
• Power - Max: 625 mW or greater
• Frequency - Transition: 150 MHz or greater

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-92-3 or equivalent TO-226 variant

The KSP2907ABU meets all substitution criteria, offering enhanced electrical performance while maintaining mechanical compatibility with the BC638G footprint and pinout.

Parameter Comparison

Engineering Selection Recommendations

BC638G Status: The BC638G is classified as obsolete. Continued procurement from existing inventory is limited to available stock levels.

KSP2907ABU Status: The KSP2907ABU is classified as active and currently in production by Fairchild Semiconductor. This component is suitable for new designs and ongoing production requirements.

Compliance and Certifications: Both components carry identical ECCN classification (EAR99) and are REACH Unaffected, ensuring regulatory consistency in substitution.

Selection Basis: For applications currently using BC638G, the KSP2907ABU provides direct electrical and mechanical substitution with enhanced performance margins. The KSP2907ABU exceeds BC638G specifications in maximum collector current (600 mA vs. 500 mA) and transition frequency (200 MHz vs. 150 MHz), while maintaining identical voltage and power ratings. The active product status of KSP2907ABU ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the KSP2907ABU directly replace the BC638G in existing designs?

A: Yes. Both components are PNP transistors in TO-92-3 packages with identical pinouts. The KSP2907ABU meets or exceeds all electrical specifications of the BC638G, including voltage breakdown (60 V), power dissipation (625 mW), and operating temperature range. Direct substitution is electrically and mechanically compatible.

Q: What are the key differences between BC638G and KSP2907ABU?

A: The KSP2907ABU provides higher maximum collector current (600 mA vs. 500 mA), higher transition frequency (200 MHz vs. 150 MHz), and lower collector cutoff current (10 nA vs. 100 nA). These differences represent performance enhancements that do not affect backward compatibility.

Q: Why is the BC638G listed as obsolete?

A: The BC638G is no longer in active production. Substitution with the active KSP2907ABU is recommended for new designs and long-term production continuity.

Q: Are there any package or pinout differences between these components?

A: No. Both components use the TO-92-3 package with identical pinout configuration. Through Hole mounting characteristics are equivalent, allowing direct PCB footprint compatibility.

Q: What compliance standards apply to both components?

A: Both the BC638G and KSP2907ABU carry ECCN classification EAR99 and are REACH Unaffected, ensuring consistent regulatory compliance across substitution.

Q: Can the KSP2907ABU be used in applications requiring the full 500 mA collector current specification?

A: Yes. The KSP2907ABU is rated for 600 mA maximum collector current, exceeding the 500 mA requirement of the BC638G. Applications operating at or below 500 mA are fully supported.