5KP190-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP190-B is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 190V reverse standoff voltage rating and 325.5V maximum clamping voltage with 5000W peak pulse power handling capability in a through-hole P600 axial package.

The 5KP190-B is classified as obsolete. Identifying functionally equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

5KP190-B

LittelfuseIn Stock: 6635KP190-B Datasheet

Current PartRFQ

5KP190A

Littelfuse Inc.In Stock: 8235KP190A Datasheet

DirectRFQ

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 5KP190-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

• Voltage - Reverse Standoff (Typ): 190V (exact match required)
• Voltage - Clamping (Max) @ Ipp: must not exceed 325.5V to ensure protection threshold compatibility
• Power - Peak Pulse: 5000W (5kW) minimum
• Operating Temperature Range: -55°C ~ 175°C (TJ) minimum
• Type: Zener diode, unidirectional configuration

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole
• Package / Case: P600 or equivalent axial package
• Unidirectional Channels: 1

Substitute parts must maintain identical reverse standoff voltage and equivalent or superior clamping voltage performance. All identified substitutes meet these criteria while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Manufactured):

The 5KP190A and 5KP190A-B are direct Littelfuse equivalents with active product status. Both maintain the 190V reverse standoff voltage specification and reduce clamping voltage to 310V, providing improved transient suppression performance compared to the obsolete 5KP190-B. The 5KP190A is supplied in Tape & Reel packaging, while the 5KP190A-B is supplied in Bulk packaging. Both are ROHS3 compliant with identical operating temperature ranges and MSL ratings.

Secondary Substitute (Alternative Manufacturer):

The 5KP190A-TP, manufactured by Micro Commercial Co, meets all electrical specifications with identical 190V reverse standoff voltage and 310V clamping voltage. This part is supplied in Cut Tape packaging and uses an R-6 axial package variant. While mechanically compatible with through-hole PCB designs, the R-6 package differs from the P600 specification. This substitute is suitable when package variant compatibility is acceptable and alternative manufacturer sourcing is permissible.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) ratings, ensuring compatibility with modern manufacturing and environmental standards. Active product status across all substitutes ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the 5KP190A directly replace the 5KP190-B without circuit modifications?

A: Yes. Both parts maintain identical 190V reverse standoff voltage and equivalent power handling (5000W peak pulse). The 5KP190A provides superior clamping voltage performance at 310V versus 325.5V, resulting in improved transient suppression. No circuit modifications are required.

Q: What is the difference between 5KP190A and 5KP190A-B?

A: Both parts are electrically identical. The difference is packaging format: 5KP190A is supplied in Tape & Reel (TR) format for automated assembly, while 5KP190A-B is supplied in Bulk format for manual handling or alternative assembly processes. Electrical performance and component specifications are identical.

Q: Is the 5KP190A-TP compatible with existing PCB designs for the 5KP190-B?

A: The 5KP190A-TP is electrically compatible and maintains through-hole mounting capability. However, the package variant differs: 5KP190A-TP uses R-6 axial packaging versus P600 for the original part. Physical dimensions may vary slightly. Verify PCB footprint compatibility before implementation.

Q: Why does the 5KP190A have a lower clamping voltage (310V) than the 5KP190-B (325.5V)?

A: The 5KP190A represents an improved design iteration within the 5KP series. The reduced clamping voltage provides superior transient voltage suppression performance while maintaining the same reverse standoff voltage and power rating. This is a performance enhancement, not a limitation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 5KP190A, 5KP190A-B, and 5KP190A-TP are all ROHS3 compliant with MSL 1 (Unlimited) ratings, meeting current environmental and manufacturing standards.

Q: Which substitute should be selected for new production designs?

A: For new production, select based on assembly requirements: 5KP190A for automated tape-and-reel assembly, or 5KP190A-B for bulk component handling. Both are Littelfuse manufactured with active product status. The 5KP190A-TP is suitable when alternative manufacturer sourcing is acceptable and package variant compatibility is confirmed.