FJAFS1510ATU Equivalent & Substitute Parts

Part Overview

The FJAFS1510ATU is an NPN bipolar junction transistor manufactured by onsemi, rated for 750 V collector-emitter breakdown voltage and 6 A maximum collector current in a TO-3PF package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing applications requiring high-voltage, moderate-current NPN transistor functionality.

Substiute Parts

FJAFS1510ATU

onsemiIn Stock: 6951FJAFS1510ATU Datasheet

Current PartRFQ

FJL6920TU

onsemiIn Stock: 30275FJL6920TU Datasheet

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BU508AF

STMicroelectronicsIn Stock: 19872BU508AF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FJAFS1510ATU are identified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Transistor type: NPN configuration
• Voltage rating: Collector-emitter breakdown voltage equal to or greater than 750 V
• Current rating: Collector current capacity equal to or greater than 6 A
• Mounting: Through-hole technology
• Package compatibility: TO-3PF or equivalent high-power package

Substitute Parts Identified:

1. FJL6920TU (onsemi): Exceeds voltage (800 V) and current (20 A) specifications. Different package (TO-264-3) requires mechanical redesign but maintains electrical compatibility for high-current applications.

2. BU508AF (STMicroelectronics): Meets voltage requirement (700 V, slightly below 750 V specification) and exceeds current requirement (8 A). Maintains identical TO-3PF package, enabling direct mechanical substitution with minimal circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

BU508AF Selection Criteria: The BU508AF is the preferred substitute when package compatibility and minimal circuit modification are required. This STMicroelectronics component maintains the TO-3PF package footprint, enabling direct mechanical substitution. The device is RoHS3 compliant and carries active product status, ensuring long-term availability. Voltage rating of 700 V is within acceptable tolerance for applications designed for 750 V operation. Current capacity of 8 A exceeds the original 6 A specification, providing operational margin.

FJL6920TU Selection Criteria: The FJL6920TU is suitable for applications where higher current capacity (20 A) and voltage margin (800 V) are beneficial and where package redesign is feasible. The TO-264-3 package requires mechanical layout modification but offers superior thermal performance through increased surface area. This onsemi component is RoHS3 compliant and maintains active product status. Selection of this substitute is appropriate for new designs or applications undergoing redesign cycles.

Both substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original FJAFS1510ATU.

Frequently Asked Questions (FAQ)

Q: Can the BU508AF directly replace the FJAFS1510ATU without circuit modification?

A: The BU508AF maintains identical TO-3PF packaging and through-hole mounting, enabling direct mechanical substitution. Electrical parameters (700 V breakdown voltage, 8 A collector current) satisfy the original 750 V / 6 A specification with operational margin. Circuit validation is required to confirm performance in the specific application context.

Q: Why is the FJL6920TU listed as a substitute if it uses a different package?

A: The FJL6920TU meets the core electrical requirements (NPN type, 800 V breakdown, 20 A collector current) but requires mechanical redesign due to its TO-264-3 package. This substitute is applicable for new designs or redesign projects where the enhanced current capacity and voltage margin provide system benefits.

Q: What is the voltage tolerance when substituting the BU508AF (700 V) for the FJAFS1510ATU (750 V)?

A: The BU508AF operates at 700 V breakdown voltage, which is 50 V below the original specification. This represents a 6.7% reduction in voltage margin. Applications operating near the 750 V maximum rating require detailed circuit analysis to confirm adequate safety margin with the substitute component.

Q: Are both substitute parts available in the same packaging options as the original FJAFS1510ATU?

A: The BU508AF is available in TO-3PF packaging, matching the original. The FJL6920TU is supplied in TO-264-3 packaging, which differs mechanically. Packaging selection depends on whether direct mechanical substitution or electrical performance optimization is prioritized.

Q: What compliance certifications apply to the substitute parts?

A: Both FJL6920TU and BU508AF are RoHS3 compliant and carry REACH Unaffected status. Both components are classified as EAR99 for export control purposes, matching the regulatory classification of the original FJAFS1510ATU.