BC517RL1G Equivalent & Substitute Parts

Part Overview

The BC517RL1G 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 BC517RL1G is classified as an obsolete product, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage ratings, current capacity, and thermal characteristics while accommodating modern packaging and compliance standards.

Substiute Parts

BC517RL1G

onsemiIn Stock: 798BC517RL1G Datasheet

Current PartRFQ

BC517-D74Z

onsemiIn Stock: 31888BC517-D74Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC517RL1G is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor topology: NPN Darlington configuration
• Voltage rating: Collector-emitter breakdown voltage of 30 V (minimum)
• Current capacity: Collector current rating of 1 A or greater
• Saturation characteristics: Vce saturation at specified bias conditions
• DC current gain: hFE minimum of 30000 at specified operating point
• Thermal performance: Operating temperature range of -55°C to 150°C

Mechanical Compatibility Criteria:

• Mounting classification: Through Hole technology
• Package family: TO-92 or TO-226 variants
• Lead configuration: Formed leads compatible with standard PCB layouts

Regulatory & Compliance Criteria:

• REACH compliance status
• RoHS compliance status (where applicable)
• ECCN classification consistency

The BC517-D74Z qualifies as a direct substitute based on matching all electrical parameters within acceptable tolerances, maintaining identical package family classification, and meeting or exceeding regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

BC517-D74Z as Primary Substitute:

The BC517-D74Z is the qualified substitute for BC517RL1G applications. This selection is based on the following factors:

Product Status Alignment: The BC517-D74Z maintains Active product status, ensuring continued availability and manufacturing support. The BC517RL1G is classified as Obsolete, making the BC517-D74Z the appropriate long-term replacement for production continuity.

Electrical Parameter Equivalence: The BC517-D74Z meets or exceeds all critical electrical specifications. The collector current rating of 1.2 A exceeds the 1 A requirement of the original part, providing design margin. Voltage ratings, saturation characteristics, and DC current gain specifications are identical. The reduced collector cutoff current (100nA versus 500nA) represents an improvement in leakage performance.

Regulatory Compliance: Both parts maintain REACH Unaffected status. The BC517-D74Z carries RoHS3 Compliance certification, meeting modern environmental and hazardous substance restrictions. The BC517RL1G does not specify RoHS status.

Package Compatibility: Both devices utilize Through Hole mounting in TO-92-3 package variants with formed leads, ensuring direct PCB layout compatibility without redesign requirements.

Moisture Sensitivity: The BC517-D74Z specifies Not Applicable MSL classification, indicating no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can BC517-D74Z directly replace BC517RL1G in existing designs?

A: Yes. The BC517-D74Z is electrically and mechanically compatible with BC517RL1G. Both devices share identical voltage ratings, saturation characteristics, and DC current gain specifications. The TO-92-3 package configuration permits direct PCB substitution without layout modifications.

Q: What are the key differences between these parts?

A: The BC517-D74Z provides a higher maximum collector current rating (1.2 A versus 1 A) and lower collector cutoff current (100nA versus 500nA). The BC517-D74Z has a lower maximum power dissipation rating (625 mW versus 1.5 W). The BC517-D74Z is an Active product with RoHS3 compliance, while BC517RL1G is Obsolete.

Q: Are there packaging differences that affect assembly?

A: Both parts use Through Hole TO-92-3 packages with formed leads. The BC517RL1G specifies Long Body configuration, while BC517-D74Z specifies standard TO-92-3 dimensions. Both are compatible with standard TO-92 PCB footprints. Verify specific lead length requirements for your application if critical spacing is a design constraint.

Q: What is the significance of the higher collector current rating on BC517-D74Z?

A: The 1.2 A rating on BC517-D74Z provides additional design margin for applications operating near the 1 A limit of BC517RL1G. This does not require circuit modification; it simply indicates the substitute part can handle higher current levels without exceeding its absolute maximum ratings.

Q: Does the lower power dissipation rating of BC517-D74Z affect substitution?

A: The BC517-D74Z power rating of 625 mW is lower than the BC517RL1G rating of 1.5 W. Verify that your application does not require sustained power dissipation exceeding 625 mW. For most switching applications, this rating is sufficient. Thermal analysis of your specific circuit is required if power dissipation approaches this limit.

Q: Are there compliance or certification differences?

A: The BC517-D74Z carries RoHS3 Compliance certification, meeting current environmental standards. Both parts maintain REACH Unaffected status. The BC517-D74Z is the appropriate choice for applications requiring RoHS compliance.

Q: What is the product status significance?

A: BC517RL1G is classified as Obsolete, indicating onsemi no longer manufactures this part. BC517-D74Z is Active, ensuring continued production and availability. For new designs and ongoing production, BC517-D74Z is the recommended selection to avoid future supply discontinuation.