1N6281A Equivalent & Substitute Parts

Part Overview

The 1N6281A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole axial configurations. This component features a 23.1V reverse standoff voltage and 37.5V maximum clamping voltage with 1500W peak pulse power handling capability. The 1N6281A is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives from multiple manufacturers provide identical electrical performance with improved availability and RoHS3 compliance.

Substiute Parts

1N6281A

onsemiIn Stock: 43951N6281A Datasheet

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1.5KE27A

Taiwan Semiconductor CorporationIn Stock: 301961.5KE27A Datasheet

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1.5KE27A

Taiwan Semiconductor CorporationIn Stock: 301961.5KE27A Datasheet

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1.5KE27A-B

LittelfuseIn Stock: 16611.5KE27A-B Datasheet

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1.5KE27A-G

Comchip TechnologyIn Stock: 9121.5KE27A-G Datasheet

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1.5KE27A-HF

Comchip TechnologyIn Stock: 7461.5KE27A-HF Datasheet

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1.5KE27A-TP

Micro Commercial CoIn Stock: 20621.5KE27A-TP Datasheet

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1V5KE27A

Taiwan Semiconductor CorporationIn Stock: 10671V5KE27A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6281A is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 23.1V
• Voltage - Breakdown (Min): 25.7V (±0.05V tolerance acceptable)
• Voltage - Clamping (Max) @ Ipp: 37.5V
• Power - Peak Pulse: 1500W (1.5kW)
• Type: Zener, Unidirectional
• Mounting Type: Through Hole, Axial package family (DO-201 variants)
• Operating Temperature: Minimum -55°C to maximum 150°C or higher

All identified substitute parts meet these core electrical specifications. Package variants within the DO-201 family (DO-201AA, DO-201AD, DO-201AE, DO-27) are mechanically and electrically interchangeable for through-hole axial applications. Differences in peak pulse current ratings (40A to 42A) do not affect substitution eligibility, as this parameter is not specified for the main part.

Parameter Comparison

Engineering Selection Recommendations

All seven substitute parts are electrically equivalent to the 1N6281A across the critical voltage and power parameters. Selection among these alternatives should be based on the following factors:

Product Status & Availability: All substitute parts carry Active product status with current manufacturing and inventory availability, eliminating obsolescence risk associated with the 1N6281A.

RoHS3 Compliance: All substitutes are RoHS3 compliant, meeting modern environmental and regulatory requirements. The 1N6281A is RoHS non-compliant and should be replaced in new designs subject to RoHS directives.

Operating Temperature Range: The 1.5KE27A-G and 1.5KE27A-HF variants operate to 150°C maximum junction temperature, compared to 175°C for other substitutes and the original 1N6281A. For applications requiring the full 175°C upper temperature limit, select from 1.5KE27A (TSC), 1.5KE27A-B (Littelfuse), 1.5KE27A-TP (MCC), or 1V5KE27A (TSC).

Package Compatibility: The 1V5KE27A maintains the exact DO-201AD package of the original part. Other substitutes use DO-201AA, DO-201AE, or DO-27 variants, which are mechanically and electrically interchangeable in through-hole axial applications.

Packaging Format: For automated assembly, 1.5KE27A (TSC) and 1.5KE27A-TP (MCC) are available in Cut Tape format. For manual assembly or reel applications, 1.5KE27A-G and 1.5KE27A-HF are supplied in Tape & Box format. 1V5KE27A is available in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1N6281A with any of these substitute parts?

A: Yes. All seven substitute parts meet the electrical specifications of the 1N6281A: 23.1V reverse standoff voltage, 37.5V clamping voltage, and 1500W peak pulse power. The through-hole axial package variants (DO-201AA, DO-201AD, DO-201AE, DO-27) are mechanically interchangeable on standard PCB layouts designed for axial components.

Q: What is the difference between DO-201AD, DO-201AA, and DO-201AE packages?

A: These are all variants of the DO-201 through-hole axial package family. DO-201AD is the original package used for the 1N6281A. DO-201AA and DO-201AE are functionally equivalent packages with identical electrical performance and mechanical compatibility. All three fit standard axial component footprints on PCBs.

Q: Why should I choose an active substitute over the obsolete 1N6281A?

A: The 1N6281A is classified as obsolete, meaning onsemi has discontinued production. Active substitutes ensure long-term supply chain reliability, current manufacturing processes, and compliance with modern standards. All substitutes are RoHS3 compliant, whereas the 1N6281A is RoHS non-compliant.

Q: Does the peak pulse current rating (40A to 42A) affect substitution?

A: No. The peak pulse current is not specified for the 1N6281A. All substitutes deliver the same 1500W peak pulse power at the specified voltage levels. Variations in peak pulse current (40A to 42A) reflect different manufacturer specifications but do not affect functional equivalence.

Q: Which substitute should I select for new designs?

A: For new designs, select based on supply chain availability and packaging requirements. The 1.5KE27A from Taiwan Semiconductor Corporation offers the highest inventory (30,100 pcs) and full 175°C operating temperature range. For exact package matching, the 1V5KE27A maintains the DO-201AD package. All substitutes are RoHS3 compliant and suitable for production.

Q: Are there temperature limitations I should consider?

A: The 1.5KE27A-G and 1.5KE27A-HF are rated to 150°C maximum junction temperature, compared to 175°C for other substitutes. If your application requires operation above 150°C, select from 1.5KE27A (TSC), 1.5KE27A-B (Littelfuse), 1.5KE27A-TP (MCC), or 1V5KE27A (TSC).

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. All substitute parts use through-hole axial packages compatible with standard PCB footprints designed for the 1N6281A. No PCB layout changes are required. Lead spacing and component orientation remain identical across all DO-201 package variants.