Littelfuse 3KP7.0A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP7.0A-B is a unidirectional Zener-type transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features a 7V reverse standoff voltage with 12V maximum clamping voltage and 250A peak pulse current capability in a through-hole P600 axial package. The 3KP7.0A-B is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

3KP7.0A-B

LittelfuseIn Stock: 11343KP7.0A-B Datasheet

Current PartRFQ

5KP7.0A-B

Littelfuse Inc.In Stock: 7565KP7.0A-B Datasheet

DirectRFQ

3KP7.0A-TP

Micro Commercial CoIn Stock: 12723KP7.0A-TP Datasheet

DirectRFQ

1.5KE8.2A-TP

Micro Commercial CoIn Stock: 17661.5KE8.2A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP7.0A-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 7V
• Voltage - Breakdown (Min): 7.78V minimum
• Voltage - Clamping (Max) @ Ipp: 12V maximum
• Unidirectional Zener type configuration
• Operating Temperature range: -55°C ~ 175°C

Mechanical Compatibility Criteria:

• Through-hole axial package configuration
• Acceptable package variants: P600, R-6, or DO-201AE

Regulatory Compliance:

• RoHS3 compliance required

Substitute parts are grouped into two categories based on these parameters: direct electrical equivalents with identical or superior current handling capability, and functional equivalents with modified electrical characteristics within acceptable tolerance ranges.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 5KP7.0A-B (Littelfuse Inc.)

The 5KP7.0A-B is the preferred direct substitute for the obsolete 3KP7.0A-B. Both components are manufactured by Littelfuse, share identical voltage specifications (7V reverse standoff, 7.78V breakdown minimum, 12V clamping maximum), and maintain the same through-hole P600 axial package. The 5KP7.0A-B offers enhanced current handling capability (425A versus 250A) and increased power dissipation (5kW versus 3kW), providing superior performance margins. Product status is active with ROHS3 compliance confirmed.

Secondary Substitute: 3KP7.0A-TP (Micro Commercial Co)

The 3KP7.0A-TP provides electrical equivalence with identical voltage and current specifications (7V standoff, 250A peak pulse, 3kW power dissipation). This component is manufactured by Micro Commercial Co and maintains active product status. The package variant is R-6 axial instead of P600, requiring mechanical verification for board-level compatibility. REACH compliance is confirmed; RoHS status is not specified in available documentation.

Tertiary Substitute: 1.5KE8.2A-TP (Micro Commercial Co)

The 1.5KE8.2A-TP is a functional equivalent with voltage specifications within acceptable tolerance (7.02V standoff, 7.79V breakdown minimum, 12.1V clamping maximum). This component is classified as manufacturer-recommended and maintains active product status with ROHS3 compliance. Peak pulse power is reduced to 1.5kW, and peak pulse current is not specified. The DO-201AE axial package differs from the original P600, requiring mechanical compatibility assessment. This substitute is suitable for applications where reduced power dissipation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 5KP7.0A-B directly replace the 3KP7.0A-B without circuit modification?

A: Yes. The 5KP7.0A-B maintains identical voltage specifications and package configuration. The increased current and power ratings provide enhanced protection margins without requiring circuit redesign.

Q: What is the primary difference between the 3KP7.0A-B and 5KP7.0A-B?

A: The 5KP series designation indicates higher current handling capability (425A versus 250A) and power dissipation (5kW versus 3kW). Voltage characteristics remain identical.

Q: Are the R-6 and P600 packages mechanically interchangeable?

A: Both are through-hole axial packages, but physical dimensions differ. Board layout and component spacing must be verified before substitution. Consult package datasheets for dimensional specifications.

Q: Is the 1.5KE8.2A-TP suitable for all applications using the 3KP7.0A-B?

A: The 1.5KE8.2A-TP is suitable only for applications where peak pulse power requirements do not exceed 1.5kW. Voltage specifications are within acceptable tolerance. Applications requiring 3kW or higher dissipation require the 3KP7.0A-TP or 5KP7.0A-B.

Q: What compliance certifications are confirmed for all substitute parts?

A: ROHS3 compliance is confirmed for the 5KP7.0A-B and 1.5KE8.2A-TP. The 3KP7.0A-TP documentation does not specify RoHS status. REACH compliance is confirmed for the 3KP7.0A-TP and 1.5KE8.2A-TP.

Q: Can I use the 3KP7.0A-TP as a substitute if the 5KP7.0A-B is unavailable?

A: Yes. The 3KP7.0A-TP provides electrical equivalence with identical voltage and current specifications. Package verification (R-6 versus P600) is required for mechanical compatibility.