1N6291A Equivalent & Substitute Parts

Part Overview

The 1N6291A is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole axial configurations. This part operates with a 58.1V reverse standoff voltage and 92V clamping voltage, delivering 1500W peak pulse power. The 1N6291A is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

1N6291A

onsemiIn Stock: 42911N6291A Datasheet

Current PartRFQ

1.5KE68A

MeritekIn Stock: 371261.5KE68A Datasheet

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1.5KE68A

MeritekIn Stock: 371261.5KE68A Datasheet

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1.5KE68A-B

Littelfuse Inc.In Stock: 7181.5KE68A-B Datasheet

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1.5KE68A-G

Comchip TechnologyIn Stock: 9101.5KE68A-G Datasheet

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1.5KE68A-HF

Comchip TechnologyIn Stock: 11901.5KE68A-HF Datasheet

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1.5KE68A-TP

Micro Commercial CoIn Stock: 16641.5KE68A-TP Datasheet

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1V5KE68A

Taiwan Semiconductor CorporationIn Stock: 7651V5KE68A Datasheet

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TP6KE68A

LittelfuseIn Stock: 2435TP6KE68A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6291A is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Breakdown (Min): 64.6V
• Voltage - Clamping (Max) @ Ipp: 92V
• Power - Peak Pulse: 1500W (1.5kW)
• Unidirectional Channels: 1
• Mounting Type: Through Hole
• Package / Case: Axial (DO-201 series)

All substitute parts listed maintain these core electrical specifications. Variations in peak pulse current (Ipp), operating temperature ranges, and RoHS compliance status are noted but do not prevent functional substitution when the voltage and power ratings align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Electrical & Compliance Match):

1.5KE68A-B (Littelfuse Inc.), 1.5KE68A-TP (Micro Commercial Co), and 1V5KE68A (Taiwan Semiconductor Corporation) are the preferred substitutes. These parts maintain all critical voltage and power specifications while offering active product status and ROHS3 compliance, addressing the obsolescence of the 1N6291A.

Secondary Substitutes (Voltage & Power Match with Temperature Limitations):

1.5KE68A-G and 1.5KE68A-HF (Comchip Technology) provide equivalent electrical performance but operate within a reduced temperature range (-55°C ~ 150°C versus -65°C ~ 175°C). These are suitable for applications not requiring the full temperature span of the original part.

Alternative Substitute (Lower Power Rating):

TP6KE68A (Littelfuse) maintains voltage specifications but delivers 600W peak pulse power versus 1500W. This part is suitable only for applications with lower energy transient requirements and operates in a smaller DO-204AC (DO-15) package.

Compliance Consideration:

The 1N6291A is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, making them suitable for new designs subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE68A-B directly replace 1N6291A in existing designs?

A: Yes. The 1.5KE68A-B maintains identical voltage specifications (58.1V standoff, 64.6V breakdown, 92V clamping) and power rating (1500W). Both use through-hole axial packages. The primary difference is RoHS compliance status and a slightly reduced operating temperature range (-55°C ~ 175°C versus -65°C ~ 175°C). Verify that your application does not require operation below -55°C.

Q: What is the difference between 1.5KE68A-TP and 1.5KE68A-B?

A: Both parts share identical electrical specifications. The primary differences are manufacturer (Micro Commercial Co versus Littelfuse Inc.), packaging format (Cut Tape versus Bulk), and package designation (DO-201AE versus DO-201AA). Electrical performance and substitution capability are equivalent.

Q: Why is TP6KE68A listed as a substitute if it has lower power rating?

A: TP6KE68A maintains the same voltage clamping characteristics (92V) and reverse standoff voltage (58.1V) as the 1N6291A. However, its 600W peak pulse power rating is half that of the original part. This substitute is applicable only to circuits where transient energy levels do not exceed 600W. Do not use TP6KE68A in applications requiring the full 1500W protection capability.

Q: Are there package compatibility concerns when substituting?

A: The 1N6291A uses DO-201AD axial package. Most substitutes (1.5KE68A-B, 1.5KE68A-G, 1.5KE68A-HF, 1V5KE68A) use compatible DO-201 series packages. The 1.5KE68A-TP uses DO-201AE, which is mechanically compatible. TP6KE68A uses DO-204AC (DO-15), a smaller package; verify PCB footprint compatibility before selection.

Q: Which substitute offers the widest operating temperature range?

A: 1.5KE68A-TP and 1V5KE68A both operate across -55°C ~ 175°C, matching the upper temperature limit of the original 1N6291A. However, the 1N6291A extends to -65°C minimum. If operation below -55°C is required, no listed substitute provides full temperature coverage.

Q: Is the 1.5KE68A (base part number without suffix) a valid substitute?

A: The 1.5KE68A from Meritek maintains voltage specifications but lacks complete parameter documentation in the provided data. Use 1.5KE68A-B, 1.5KE68A-TP, or 1V5KE68A for documented substitution with full electrical and compliance specifications.