FR155 Equivalent & Substitute Parts

Part Overview

The FR155 is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 1.5 A average rectified current in a through-hole DO-15 package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The FR155 employs fast recovery technology with a reverse recovery time of 250 ns, suitable for standard rectification applications requiring moderate current handling at high voltage levels.

Substiute Parts

FR155

SMC Diode SolutionsIn Stock: 4639FR155 Datasheet

Current PartRFQ

FR155G

Taiwan Semiconductor CorporationIn Stock: 8117FR155G Datasheet

DirectRFQ

3A60 A0G

Taiwan Semiconductor CorporationIn Stock: 11313A60 A0G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FR155 is determined by electrical and mechanical parameter compatibility within the rectifier diode category. The primary substitution criteria are:

Direct Electrical Equivalence: Parts must maintain identical or superior voltage rating (600 V minimum), current rating (1.5 A minimum), forward voltage characteristics, and reverse recovery performance to ensure functional interchangeability without circuit redesign.

Package Compatibility: All substitute parts must use the DO-204AC (DO-15) through-hole axial package to ensure mechanical fit and PCB assembly compatibility.

Temperature Range: Operating junction temperature range must encompass or exceed the original specification to maintain reliability across the intended thermal environment.

Technology Classification: Fast recovery diodes with reverse recovery time ≤ 500 ns are classified as direct equivalents. Standard recovery diodes (> 500 ns) represent functional alternatives with different switching characteristics and are suitable only where circuit design permits extended recovery times.

Substitutes are grouped into two categories: direct manufacturer equivalents (identical electrical performance, different manufacturer or packaging) and similar alternatives (higher current rating, same voltage class, compatible package).

Parameter Comparison

Engineering Selection Recommendations

FR155G (Taiwan Semiconductor Corporation): This part is the direct electrical and mechanical equivalent of the FR155. It maintains identical voltage rating (600 V), current rating (1.5 A), forward voltage (1.3 V @ 1.5 A), and reverse recovery time (250 ns). The FR155G is classified as active product status, ensuring ongoing availability and supply chain continuity. It is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The operating temperature range is -55°C to 150°C, which is narrower than the original FR155 (-65°C to 150°C) at the lower bound; this difference is acceptable for applications not requiring operation below -55°C. The FR155G is the primary substitute for direct replacement in existing designs.

3A60 A0G (Taiwan Semiconductor Corporation): This part shares the same 600 V voltage rating and DO-204AC package but provides double the current rating (3 A versus 1.5 A). It is suitable as a substitute only in applications where the circuit design permits higher current capacity and where the standard recovery speed (> 500 ns) does not conflict with switching frequency or EMI requirements. The 3A60 A0G is active product status and ROHS3 compliant. This part is appropriate for designs requiring current margin or where the original 1.5 A rating was conservative. The lower forward voltage (1.1 V @ 3 A) may reduce power dissipation in high-current applications.

Selection between FR155G and 3A60 A0G depends on circuit current requirements and switching performance specifications. For direct replacement without design modification, FR155G is the appropriate choice. For applications tolerating higher current capacity and standard recovery characteristics, 3A60 A0G provides an alternative with enhanced current handling.

Frequently Asked Questions (FAQ)

Q: Can the FR155G be used as a direct replacement for the FR155?

A: Yes. The FR155G maintains identical electrical specifications: 600 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage at 1.5 A, and 250 ns reverse recovery time. Both parts use the DO-204AC (DO-15) through-hole axial package. The operating temperature range of FR155G (-55°C to 150°C) is narrower at the lower bound; verify that your application does not require operation below -55°C.

Q: What is the difference between the FR155G and the 3A60 A0G?

A: The FR155G is a direct 1:1 electrical equivalent with 1.5 A current rating and fast recovery characteristics (250 ns). The 3A60 A0G has double the current rating (3 A) and uses standard recovery technology (> 500 ns). Both share the same 600 V voltage rating and DO-15 package. The 3A60 A0G is suitable only if your circuit design accommodates higher current capacity and extended reverse recovery time.

Q: Why is the FR155 classified as obsolete?

A: The FR155 is no longer manufactured by SMC Diode Solutions. The FR155G from Taiwan Semiconductor Corporation provides equivalent functionality and is actively produced, ensuring supply continuity for applications requiring this performance class.

Q: Are there any compliance differences between the FR155 and its substitutes?

A: The FR155G and 3A60 A0G are both ROHS3 compliant and REACH unaffected. The original FR155 compliance status is not specified in available documentation. Both substitutes meet current regulatory requirements for electronic component procurement.

Q: Can the 3A60 A0G be used in place of the FR155 in all applications?

A: The 3A60 A0G can be used mechanically and electrically in circuits designed for 600 V operation. However, the standard recovery speed (> 500 ns) differs from the FR155's fast recovery (250 ns). Applications sensitive to switching speed, EMI performance, or operating frequency may require circuit evaluation before substitution. The higher current rating (3 A) is compatible with circuits designed for 1.5 A operation.

Q: What package considerations apply to these substitutes?

A: All three parts (FR155, FR155G, and 3A60 A0G) use the DO-204AC (DO-15) through-hole axial package. They are mechanically interchangeable on PCBs designed for this package. No PCB layout modifications are required for substitution.

Q: Is the lower operating temperature minimum of FR155G (-55°C versus -65°C) a concern?

A: This difference is relevant only if your application requires reliable operation below -55°C. For standard industrial and commercial temperature ranges, the FR155G operating range is sufficient. Verify your application's minimum operating temperature requirement before selection.