3KP8.0A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP8.0A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features an 8V reverse standoff voltage with a 13.6V maximum clamping voltage and 220.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

3KP8.0A-B

Littelfuse Inc.In Stock: 9433KP8.0A-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

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP8.0A-B are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 8V
• Voltage - Breakdown (Min): 8.89V
• Voltage - Clamping (Max) @ Ipp: 13.6V
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial

Functional Compatibility Criteria:

• Applications: General Purpose
• Power Line Protection: No

The 3KP8.0A-B has two identified substitute parts: the 5KP8.0A-B and the 3KP8.0A-TP. Both maintain identical voltage specifications and operating temperature ranges. The 5KP8.0A-B offers increased peak pulse current (375A vs. 220.6A) and higher peak pulse power (5000W vs. 3000W) while maintaining the same package footprint. The 3KP8.0A-TP provides equivalent electrical performance with identical current and power ratings but uses an R-6 axial package variant and is sourced from Micro Commercial Co.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): The 3KP8.0A-TP from Micro Commercial Co provides electrical and power rating equivalence to the 3KP8.0A-B. Both components maintain 220.6A peak pulse current and 3000W peak pulse power. The primary difference is the axial package variant (R-6 vs. P600). This substitute is suitable when the R-6 package footprint is compatible with existing PCB layouts. The 3KP8.0A-TP is currently in active production status.

For Enhanced Performance (Higher Current/Power Rating): The 5KP8.0A-B from Littelfuse Inc. maintains identical voltage specifications and operating temperature range while providing increased peak pulse current (375A) and peak pulse power (5000W). This component fits the same P600 axial package and is suitable for applications requiring higher transient energy absorption. The 5KP8.0A-B is currently in active production status and ROHS3 compliant.

Both substitute parts maintain compliance with ROHS3 standards and are sourced from established manufacturers with active product status, addressing the obsolescence of the original 3KP8.0A-B component.

Frequently Asked Questions (FAQ)

Q: Can the 5KP8.0A-B be used as a direct replacement for the 3KP8.0A-B? A: Yes, the 5KP8.0A-B is electrically compatible. Both components share identical voltage specifications (8V reverse standoff, 13.6V clamping) and operating temperature range (-55°C to 175°C). The 5KP8.0A-B provides higher peak pulse current (375A vs. 220.6A) and power (5000W vs. 3000W), making it suitable for the same application with enhanced transient protection capability. Both use the P600 axial package.

Q: What is the difference between the P600 and R-6 packages? A: Both P600 and R-6 are axial through-hole package variants for TVS diodes. The primary difference is the physical package geometry and lead configuration. The 3KP8.0A-TP uses the R-6 package while the original 3KP8.0A-B uses P600. Package compatibility depends on PCB layout and lead spacing specifications. Verify footprint compatibility before substitution.

Q: Why is the 3KP8.0A-B obsolete? A: The 3KP8.0A-B is listed as obsolete by Littelfuse Inc. The 5KP8.0A-B and 3KP8.0A-TP are active alternatives that provide equivalent or enhanced functionality, making them suitable for new designs and ongoing system support.

Q: Are both substitute parts ROHS3 compliant? A: The 5KP8.0A-B is confirmed ROHS3 compliant. The 3KP8.0A-TP RoHS status is not specified in the provided data. Verify RoHS compliance requirements with the manufacturer or supplier before final component selection.

Q: Can I use the 3KP8.0A-TP if my PCB is designed for the P600 package? A: The 3KP8.0A-TP uses the R-6 axial package, which has different physical dimensions and lead spacing compared to the P600 package. Direct substitution requires PCB layout modification. If P600 package compatibility is required, use the 5KP8.0A-B instead.