BC517G Equivalent & Substitute Parts

Part Overview

The BC517G is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 30 V collector-emitter breakdown voltage rating and 1 A maximum collector current capability in a Through Hole TO-92 package. The BC517G is classified as an obsolete product, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

BC517G

onsemiIn Stock: 2918BC517G Datasheet

Current PartRFQ

BC517-D74Z

onsemiIn Stock: 31888BC517-D74Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC517G is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

• Transistor type must be NPN - Darlington configuration
• Collector-emitter breakdown voltage (VCEO) must be 30 V or greater
• Maximum collector current (Ic) must be equal to or exceed 1 A
• DC current gain (hFE) minimum must be 30000 or greater at specified test conditions
• Vce saturation characteristics must be compatible at specified base and collector currents
• Power dissipation rating must be 625 mW or greater
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Requirements:

• Package type must be TO-92-3 or TO-226-3 (Through Hole)
• Lead configuration must be compatible with existing PCB layouts

Regulatory and Compliance Requirements:

• REACH compliance status must be unaffected or compliant
• ECCN classification must be EAR99

The BC517-D74Z meets all substitution criteria as an active product offering improved specifications and enhanced availability.

Parameter Comparison

Engineering Selection Recommendations

The BC517-D74Z is a direct substitute for the BC517G based on the following engineering criteria:

Electrical Equivalence: The BC517-D74Z maintains identical electrical specifications across all critical parameters including collector-emitter breakdown voltage, saturation characteristics, and DC current gain. The substitute device provides enhanced collector current capability (1.2 A versus 1 A) and reduced collector cutoff current (100 nA versus 500 nA), both of which represent improvements over the original specification without introducing incompatibility.

Product Status: The BC517G is classified as obsolete, while the BC517-D74Z is an active product. This transition ensures continued availability and supply chain reliability for new designs and ongoing production requirements.

Regulatory Compliance: Both devices maintain identical REACH compliance status (REACH Unaffected) and ECCN classification (EAR99), ensuring no regulatory barriers to substitution.

Mechanical Compatibility: Both devices utilize identical Through Hole TO-92-3 and TO-226-3 package configurations, permitting direct PCB layout compatibility without redesign.

Packaging Format: The BC517-D74Z is supplied in Cut Tape (CT) format with significantly higher inventory availability (31,849 pieces versus 2,900 pieces), supporting production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the BC517-D74Z be used as a direct replacement for the BC517G in existing designs?

A: Yes. The BC517-D74Z is electrically and mechanically equivalent to the BC517G. All critical electrical parameters including voltage ratings, current gain, and saturation characteristics are identical. The TO-92-3 package configuration is identical, permitting direct PCB substitution without layout modifications.

Q: What are the key differences between the BC517G and BC517-D74Z?

A: The primary differences are product status and enhanced specifications. The BC517G is obsolete while the BC517-D74Z is an active product. The BC517-D74Z provides higher maximum collector current (1.2 A versus 1 A) and lower collector cutoff current (100 nA versus 500 nA). These differences represent improvements that do not compromise compatibility with applications designed for the BC517G.

Q: Are there any thermal or frequency limitations when substituting the BC517-D74Z for the BC517G?

A: No. Both devices share identical maximum power dissipation (625 mW) and operating temperature range (-55°C to 150°C). The BC517G specifies a transition frequency of 200 MHz; the BC517-D74Z does not specify this parameter in the provided data, but this does not indicate a limitation for applications within the BC517G's frequency specification.

Q: What packaging options are available for the BC517-D74Z?

A: The BC517-D74Z is supplied in Cut Tape (CT) format in TO-92-3 package configuration. This format is suitable for automated assembly processes and high-volume production environments.

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

A: No. Both devices maintain identical REACH compliance status (REACH Unaffected) and ECCN classification (EAR99). No regulatory barriers exist to substitution.

Q: Why is the BC517G classified as obsolete?

A: The BC517G is listed as an obsolete product by the manufacturer. The BC517-D74Z represents the active equivalent in the onsemi product portfolio, ensuring continued support and availability for this device category.