Equivalent & Substitute Parts for 3KP8.0-B

Part Overview

The 3KP8.0-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose voltage protection applications. This component features an 8V reverse standoff voltage with a 14.28V maximum clamping voltage and 220.6A peak pulse current capability in a through-hole P600 axial package. The product is currently classified as obsolete, necessitating identification of active alternative components that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

3KP8.0-B

LittelfuseIn Stock: 10623KP8.0-B Datasheet

Current PartRFQ

5KP8.0A-B

Littelfuse Inc.In Stock: 10545KP8.0A-B Datasheet

DirectRFQ

3KP8.0A-TP

Micro Commercial CoIn Stock: 12073KP8.0A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP8.0-B are identified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff: 8V (primary protection threshold)
• Voltage - Clamping (Max) @ Ipp: Must not exceed 14.28V to ensure circuit protection integrity
• Current - Peak Pulse: Minimum 220.6A to handle transient events
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: P600 or equivalent axial package
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener diode, unidirectional configuration

The 5KP8.0A-B qualifies as a direct substitute with superior current handling (375A) and power dissipation (5000W) while maintaining the same voltage protection characteristics. The 3KP8.0A-TP, manufactured by Micro Commercial Co, provides equivalent electrical performance with identical peak pulse current (220.6A) and power rating (3000W), though it uses an R-6 package variant.

Parameter Comparison

Engineering Selection Recommendations

The 5KP8.0A-B is the primary substitute for the obsolete 3KP8.0-B. Both components are manufactured by Littelfuse, maintain identical voltage protection parameters, and use the same P600 axial package. The 5KP8.0A-B offers enhanced current handling (375A versus 220.6A) and increased power dissipation (5000W versus 3000W), providing superior transient protection margin. The component is currently in active production status with ROHS3 compliance certification.

The 3KP8.0A-TP, manufactured by Micro Commercial Co, provides an alternative with matched electrical performance (220.6A peak pulse current, 3000W power rating) and active product status. This option maintains the same voltage protection characteristics as the original 3KP8.0-B. The R-6 package variant requires mechanical board layout verification to ensure footprint compatibility with existing P600 designs.

Frequently Asked Questions (FAQ)

Q: Can the 5KP8.0A-B be used as a direct replacement for the 3KP8.0-B?

A: Yes. Both components share the same 8V reverse standoff voltage, identical clamping voltage characteristics, and P600 axial package. The 5KP8.0A-B provides higher current and power ratings, making it functionally superior for the same application.

Q: What is the difference between the P600 and R-6 packages?

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 are different package designations that may have different physical dimensions. Board layout verification is required when substituting between these package types.

Q: Are all substitute parts RoHS compliant?

A: The 5KP8.0A-B is ROHS3 compliant. The 3KP8.0A-TP RoHS status is not specified in the provided data.

Q: What determines whether a TVS diode can substitute for the 3KP8.0-B?

A: The critical parameters are reverse standoff voltage (8V), maximum clamping voltage (not exceeding 14.28V), peak pulse current capability (minimum 220.6A), through-hole mounting type, and operating temperature range (-55°C to 175°C). Package compatibility must also be verified for board integration.

Q: Can the 3KP8.0A-TP be used if the board layout uses P600 footprints?

A: The 3KP8.0A-TP uses an R-6 package, which differs from the P600 package of the original component. Physical footprint compatibility must be confirmed before substitution.