3KP190-B Equivalent & Substitute Parts

Part Overview

The 3KP190-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 190V reverse standoff voltage with a maximum clamping voltage of 325.5V at peak pulse current. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility for new designs and ongoing production requirements.

Substiute Parts

3KP190-B

Littelfuse Inc.In Stock: 7203KP190-B Datasheet

Current PartRFQ

5KP190A-B

Littelfuse Inc.In Stock: 12105KP190A-B Datasheet

DirectRFQ

5KP190A-TP

Micro Commercial CoIn Stock: 15635KP190A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP190-B is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 190V (exact match required)
• Unidirectional Channels: 1 (single channel configuration)
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: P600 or R-6 Axial (physical footprint compatibility)
• Operating Temperature Range: -55°C to 175°C (thermal envelope)
• RoHS3 Compliance: Required for regulatory alignment

Secondary Compatibility Factors:

• Voltage - Clamping (Max) @ Ipp: Substitute values must not exceed application voltage limits
• Current - Peak Pulse: Higher ratings provide enhanced protection margin
• Power - Peak Pulse: Higher ratings indicate improved transient handling capability

The identified substitutes maintain the 190V reverse standoff voltage specification and through-hole axial package configuration, ensuring direct functional replacement in circuit designs.

Parameter Comparison

Engineering Selection Recommendations

5KP190A-B (Littelfuse Inc.): This substitute is the primary equivalent for the 3KP190-B. Both components are manufactured by Littelfuse Inc., share identical reverse standoff voltage specifications, and maintain the same through-hole P600 axial package. The 5KP190A-B is currently in active production status, ensuring long-term availability. The substitute provides improved performance characteristics with higher peak pulse current (16.5A versus 9.7A) and increased peak pulse power (5000W versus 3000W), delivering enhanced transient protection capability. All regulatory certifications, including ROHS3 compliance and moisture sensitivity level 1, are maintained.

5KP190A-TP (Micro Commercial Co): This alternative substitute maintains electrical compatibility with identical reverse standoff voltage and clamping voltage specifications. The component is supplied in cut tape packaging with an R-6 axial package configuration, which differs from the original P600 package. This substitute is suitable for applications where packaging format flexibility is acceptable. The part is actively produced and fully compliant with ROHS3 and REACH requirements. Peak pulse power rating matches the 5KP190A-B at 5000W.

Both substitutes are recommended based on active product status, regulatory compliance, and electrical parameter compatibility with the obsolete 3KP190-B.

Frequently Asked Questions (FAQ)

Q: Can the 5KP190A-B directly replace the 3KP190-B in existing designs?

A: Yes. Both components share the same 190V reverse standoff voltage, unidirectional channel configuration, through-hole mounting type, and P600 axial package. The 5KP190A-B provides equivalent electrical functionality with improved performance margins.

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

A: Both are through-hole axial packages for TVS diodes. The P600 is the original package format for the 3KP190-B and 5KP190A-B. The R-6 is an alternative axial package used for the 5KP190A-TP. Package selection depends on PCB layout and mechanical assembly requirements.

Q: Why does the 5KP190A-TP not specify peak pulse current?

A: The peak pulse current parameter is not provided in the component data for the 5KP190A-TP. However, the peak pulse power rating of 5000W is specified, indicating comparable transient handling capability to the 5KP190A-B.

Q: Are all substitutes RoHS3 compliant?

A: Yes. The 3KP190-B, 5KP190A-B, and 5KP190A-TP are all ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What is the impact of the higher clamping voltage in the 3KP190-B compared to substitutes?

A: The 3KP190-B exhibits a maximum clamping voltage of 325.5V, while both substitutes clamp at 310V. The lower clamping voltage in substitutes provides tighter voltage regulation during transient events, which may offer improved circuit protection in applications sensitive to voltage overshoot.

Q: Can the 5KP190A-TP be used in bulk production if the original design specified P600 packaging?

A: The R-6 package is mechanically compatible with through-hole PCB designs, but PCB layout verification is required to confirm footprint compatibility. Consult PCB design documentation and component datasheets for specific package dimensions.