3KP9.0 Equivalent & Substitute Parts

Part Overview

The 3KP9.0 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 9V reverse standoff voltage with a 16.17V maximum clamping voltage and 194.8A peak pulse current capability in a P600 axial through-hole package. The product is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

3KP9.0

Littelfuse Inc.In Stock: 7163KP9.0 Datasheet

Current PartRFQ

5KP9.0A

LittelfuseIn Stock: 33145KP9.0A Datasheet

DirectRFQ

5KP9.0A-TP

Micro Commercial CoIn Stock: 63685KP9.0A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP9.0 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 9V (exact match required)
• Voltage - Breakdown (Min): 9.5V minimum
• Unidirectional Channels: 1 (single channel configuration)
• Type: Zener diode
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or equivalent axial through-hole package
• RoHS Status: ROHS3 Compliant

Performance Consideration: Substitute parts may exceed the original 3000W peak pulse power rating and 194.8A peak pulse current, as higher performance ratings provide enhanced protection capability without compromising circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

5KP9.0A (Littelfuse) is the primary substitute for the obsolete 3KP9.0. Both components are manufactured by Littelfuse, share identical reverse standoff voltage (9V), and maintain the same operating temperature range (-55°C ~ 175°C). The 5KP9.0A is active in production status and ROHS3 compliant. The substitute provides enhanced peak pulse power (5000W vs. 3000W) and higher peak pulse current (331.2A vs. 194.8A), delivering superior transient protection while maintaining electrical compatibility. The P600 axial package ensures direct mechanical compatibility.

5KP9.0A-TP (Micro Commercial Co) serves as an alternative substitute, offering the same 9V reverse standoff voltage, identical operating temperature range, and ROHS3 compliance. This component is also active in production. The primary distinction is the R-6 axial package instead of P600; however, both are standard through-hole axial configurations suitable for equivalent circuit board layouts. The 5000W peak pulse power rating matches the Littelfuse 5KP9.0A. Selection between these two substitutes depends on package availability and supplier preference, as electrical performance and compliance characteristics are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 5KP9.0A directly replace the 3KP9.0 in existing designs?

A: Yes. Both components share the critical electrical parameters: 9V reverse standoff voltage, 1 unidirectional channel, Zener type, and identical operating temperature range (-55°C ~ 175°C). The P600 axial through-hole package is mechanically identical. The 5KP9.0A's higher power rating (5000W vs. 3000W) and peak pulse current (331.2A vs. 194.8A) provide enhanced protection without compromising compatibility.

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

A: Both P600 and R-6 are axial through-hole package designations for TVS diodes. The primary difference lies in the specific package dimensions and lead configuration defined by the respective manufacturers. For circuit board layout purposes, both are compatible with standard through-hole axial component footprints, though PCB design files should reference the specific package datasheet to confirm exact lead spacing and hole diameter requirements.

Q: Why does the 5KP9.0A-TP show no peak pulse current specification?

A: The peak pulse current (10/1000µs) is not provided in the available technical data for the 5KP9.0A-TP. However, the specified 5000W peak pulse power rating and 15.4V maximum clamping voltage are the primary electrical parameters for substitution evaluation. Detailed current specifications are available in the manufacturer's complete datasheet.

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both the 5KP9.0A (Littelfuse) and 5KP9.0A-TP (Micro Commercial Co) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance status of the original 3KP9.0.

Q: What is the significance of the "Active" product status for substitute parts?

A: Active product status indicates that the component is currently in production and available from the manufacturer. This ensures long-term supply chain reliability and availability for both new designs and replacement applications, unlike the obsolete 3KP9.0 which is no longer manufactured.