3KP22A-B Equivalent & Substitute Parts

Part Overview

The 3KP22A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 84.5A peak pulse current capability in a through-hole P600 axial package. The product is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

3KP22A-B

Littelfuse Inc.In Stock: 9333KP22A-B Datasheet

Current PartRFQ

5KP22A-B

LittelfuseIn Stock: 11255KP22A-B Datasheet

DirectRFQ

3KP22A-TP

Micro Commercial CoIn Stock: 8873KP22A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP22A-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 22V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 35.5V (exact match required)
• Current - Peak Pulse (10/1000µs): minimum 84.5A
• Operating Temperature Range: -55°C to 175°C (minimum requirement)
• Mounting Type: Through Hole (exact match required)
• Package / Case: P600 or equivalent axial package
• Type: Zener, Unidirectional (exact match required)

Substitute parts must maintain identical voltage specifications and temperature operating range while meeting or exceeding the peak pulse current rating. Package compatibility is restricted to through-hole axial configurations with equivalent mechanical and electrical footprints.

Parameter Comparison

Engineering Selection Recommendations

5KP22A-B (Littelfuse): This substitute maintains identical voltage specifications and operating temperature range as the 3KP22A-B while offering enhanced peak pulse current capability (143.7A versus 84.5A) and increased power dissipation (5000W versus 3000W). The component is manufactured by the original equipment manufacturer and carries active product status with ROHS3 compliance certification. This part is suitable for direct replacement in applications where the enhanced current and power ratings provide additional design margin.

3KP22A-TP (Micro Commercial Co): This substitute provides electrical equivalence with matching voltage specifications, peak pulse current (84.5A), and power dissipation (3000W) ratings. The component maintains the same operating temperature range and is manufactured by an alternative supplier with active product status. The package designation differs (R-6 versus P600), requiring verification of mechanical compatibility with existing PCB layouts and component mounting fixtures before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 5KP22A-B be used as a direct replacement for the 3KP22A-B?

A: Yes. The 5KP22A-B maintains identical voltage specifications (22V reverse standoff, 35.5V clamping) and operating temperature range (-55°C to 175°C). Both components use the P600 axial package. The 5KP22A-B provides higher peak pulse current (143.7A) and power dissipation (5000W), which exceeds the original 3KP22A-B requirements and is electrically compatible.

Q: What is the difference between the 3KP22A-TP and the 3KP22A-B?

A: Both components share identical electrical specifications: 22V reverse standoff voltage, 35.5V clamping voltage, 84.5A peak pulse current, and 3000W power dissipation. The primary difference is the package designation: the 3KP22A-TP uses an R-6 axial package while the 3KP22A-B uses a P600 axial package. Mechanical compatibility with existing PCB footprints must be verified before substitution.

Q: Are there any compliance differences between substitute options?

A: The 5KP22A-B and 3KP22A-B both carry ROHS3 compliance certification. The 3KP22A-TP does not specify RoHS status in the provided documentation. Both the 5KP22A-B and 3KP22A-B are classified as REACH Unaffected. Compliance requirements for your specific application should be verified against procurement specifications.

Q: Which substitute should be selected for new designs?

A: Selection depends on application requirements. The 5KP22A-B is recommended for applications requiring maximum design margin due to its higher current and power ratings, while maintaining the same voltage protection characteristics. The 3KP22A-TP is suitable for applications with equivalent electrical requirements and where the R-6 package is mechanically compatible with existing designs.