3KP190A-B Equivalent & Substitute Parts

Part Overview

The 3KP190A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 190V reverse standoff voltage with a 310V maximum clamping voltage and 9.7A peak pulse current capability in a through-hole P600 axial package. The device is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

3KP190A-B

Littelfuse Inc.In Stock: 7573KP190A-B Datasheet

Current PartRFQ

5KP190A-B

Littelfuse Inc.In Stock: 12105KP190A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP190A-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 190V
• Voltage - Breakdown (Min): 211V
• Voltage - Clamping (Max) @ Ipp: 310V
• Package / Case: P600, Axial
• Mounting Type: Through Hole
• Type: Zener, Unidirectional

Allowable Variations:

• Current - Peak Pulse (10/1000µs): Equal or greater than 9.7A
• Power - Peak Pulse: Equal or greater than 3000W
• Operating Temperature Range: Must encompass or match -55°C to 175°C

The 5KP190A-B qualifies as a direct substitute because it maintains identical voltage specifications, package configuration, and mounting type while providing enhanced current handling (16.5A) and power dissipation (5000W) capabilities.

Parameter Comparison

Engineering Selection Recommendations

The 5KP190A-B is the qualified substitute for the obsolete 3KP190A-B. Both devices are manufactured by Littelfuse Inc. and maintain identical electrical specifications for voltage protection parameters. The 5KP190A-B offers superior performance characteristics with increased peak pulse current (16.5A versus 9.7A) and peak pulse power (5000W versus 3000W), providing enhanced transient suppression capability within the same physical footprint.

The 5KP190A-B is currently in active production status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and identical operating temperature ranges, supporting direct substitution in existing designs without thermal or regulatory concerns.

Frequently Asked Questions (FAQ)

Q: Can the 5KP190A-B directly replace the 3KP190A-B in existing designs?

A: Yes. The 5KP190A-B maintains identical voltage specifications (190V reverse standoff, 310V clamping), package configuration (P600 axial), and mounting type (through hole). The increased current and power ratings provide enhanced performance without compatibility issues.

Q: What are the key differences between these two parts?

A: The primary differences are peak pulse current (5KP190A-B: 16.5A versus 3KP190A-B: 9.7A) and peak pulse power (5KP190A-B: 5000W versus 3KP190A-B: 3000W). All voltage parameters and physical characteristics remain identical.

Q: Why is the 3KP190A-B obsolete?

A: The 3KP190A-B is classified as obsolete by the manufacturer. The 5KP190A-B represents the active production equivalent with enhanced specifications.

Q: Are there any thermal or compliance differences?

A: No. Both devices operate across the same temperature range (-55°C to 175°C) and maintain ROHS3 compliance. No thermal or regulatory modifications are required for substitution.

Q: Is the P600 axial package identical between both parts?

A: Yes. Both the 3KP190A-B and 5KP190A-B use the P600 axial through-hole package, ensuring mechanical and electrical compatibility on existing PCB layouts.