1N6281ARL4 Equivalent & Substitute Parts

Part Overview

The 1N6281ARL4 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This axial through-hole component operates across a temperature range of -65°C to 175°C and delivers 1500W peak pulse power with a 37.5V maximum clamping voltage. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

1N6281ARL4

onsemiIn Stock: 11501N6281ARL4 Datasheet

Current PartRFQ

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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1V5KE27A

Taiwan Semiconductor CorporationIn Stock: 10671V5KE27A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6281ARL4 is determined by strict electrical and mechanical parameter matching:

Critical Matching 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
• Package / Case: DO-201 series (DO-201AA, DO-27, DO-201AD, Axial)

All substitute parts listed maintain these core electrical specifications. Variations in peak pulse current (40A to 42A) and operating temperature ranges are within acceptable engineering tolerances for general-purpose TVS applications. Packaging variants (Cut Tape, Bulk, Tape & Box, Tape & Reel) represent different distribution formats of electrically identical components.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 1V5KE27A (Taiwan Semiconductor Corporation)

The 1V5KE27A provides the closest electrical and mechanical match to the 1N6281ARL4. It maintains identical voltage specifications (23.1V standoff, 25.7V breakdown, 37.5V clamping), equivalent power rating (1500W), and matching DO-201AD axial package geometry. This part is actively manufactured, ROHS3 compliant, and available in high inventory (1007 pcs). The operating temperature range (-55°C to 175°C) covers the original part's upper operating limit, making it suitable for applications not requiring the extended -65°C lower temperature specification.

Secondary Recommendations:

1.5KE27A (Taiwan Semiconductor Corporation) - Active status, ROHS3 compliant, highest peak pulse current specification (42A), available in DO-201AA/DO-27 axial packages. Suitable for applications where the original -65°C lower temperature limit is not required.

1.5KE27A-B (Littelfuse) - Active status, ROHS3 compliant, 40.5A peak pulse current, available in bulk packaging. Appropriate for high-volume production environments.

1.5KE27A-G and 1.5KE27A-HF (Comchip Technology) - Both active, ROHS3 compliant alternatives with 40A peak pulse current. Operating temperature range limited to -55°C to 150°C; suitable only for applications not requiring extended temperature performance.

All substitute parts are electrically interchangeable within the specified parameter tolerances. Selection should prioritize active product status and ROHS3 compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1N6281ARL4 with any of the listed substitutes?

A: Yes, all listed substitutes are electrically and mechanically compatible. They share identical voltage specifications (23.1V standoff, 37.5V clamping), equivalent 1500W power rating, and compatible through-hole axial packaging. The primary consideration is operating temperature range; if your application requires operation below -55°C, only the 1V5KE27A maintains the original -65°C lower limit.

Q: What is the difference between DO-201AD and DO-201AA packaging?

A: Both are axial through-hole packages with identical electrical performance and pin spacing. DO-201AD and DO-201AA are mechanically interchangeable in standard PCB layouts. The designation reflects minor dimensional variations that do not affect circuit functionality or board assembly.

Q: Why are some substitutes ROHS3 compliant while the original is not?

A: The 1N6281ARL4 is an obsolete part manufactured before current RoHS3 regulations were fully implemented. All active substitute parts comply with current environmental and hazardous substance restrictions, making them suitable for modern production and regulatory requirements.

Q: Does peak pulse current variation (40A to 42A) affect substitution suitability?

A: No. All substitute parts maintain the same 1500W peak pulse power specification. Variations in peak pulse current reflect different manufacturer characterization methods and do not impact circuit protection performance in general-purpose TVS applications.

Q: Which substitute has the best availability?

A: The 1.5KE27A (Taiwan Semiconductor Corporation) offers the highest inventory level at 30,100 pcs, followed by 1V5KE27A at 1,007 pcs. Both are actively manufactured and suitable for immediate procurement.