3KP100A-B Equivalent & Substitute Parts

Part Overview

The 3KP100A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 100V reverse standoff voltage with a 162V maximum clamping voltage and 18.5A peak pulse current capability. The part is classified as obsolete, making identification of suitable equivalent and substitute components essential for ongoing design support and procurement planning.

Substiute Parts

3KP100A-B

Littelfuse Inc.In Stock: 8153KP100A-B Datasheet

Current PartRFQ

5KP100A-B

Littelfuse Inc.In Stock: 9245KP100A-B Datasheet

DirectRFQ

3KP100A-TP

Micro Commercial CoIn Stock: 10753KP100A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP100A-B is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 100V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 162V (exact match required)
• Current - Peak Pulse (10/1000µs): minimum 18.5A
• Operating Temperature Range: -55°C ~ 175°C (minimum requirement)
• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial (compatible footprints)
• Type: Zener, Unidirectional

Two substitute parts meet these criteria:

1. 5KP100A-B (Littelfuse Inc.) - Direct manufacturer upgrade with enhanced current rating (31.5A) and power dissipation (5kW), maintaining identical voltage specifications and through-hole P600 package.

2. 3KP100A-TP (Micro Commercial Co) - Manufacturer-recommended equivalent with identical electrical specifications and current rating (18.5A), utilizing R-6 axial package compatible with P600 footprint requirements.

Parameter Comparison

Engineering Selection Recommendations

5KP100A-B is recommended as the primary substitute for new designs and ongoing production. This part is manufactured by Littelfuse Inc. (original manufacturer), maintains active product status, and provides identical voltage specifications with enhanced current handling (31.5A vs. 18.5A) and power dissipation (5kW vs. 3kW). The P600 package ensures direct mechanical and electrical compatibility. ROHS3 compliance is maintained.

3KP100A-TP serves as an alternative equivalent when 5KP100A-B availability is constrained. Manufactured by Micro Commercial Co, this part delivers identical electrical performance and current rating to the original 3KP100A-B. The R-6 axial package is mechanically compatible with P600 footprint requirements. Active product status ensures long-term supply continuity.

Both substitutes satisfy compliance requirements and operational temperature specifications. Selection between them depends on procurement availability, cost considerations, and specific application thermal management requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5KP100A-B be used as a direct replacement for the 3KP100A-B?

A: Yes. The 5KP100A-B maintains identical voltage specifications (100V standoff, 162V clamping) and through-hole P600 package. The higher current rating (31.5A) and power dissipation (5kW) provide enhanced performance margins without affecting circuit compatibility.

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

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 are mechanically compatible footprints suitable for identical PCB mounting applications.

Q: Why is the 3KP100A-B listed as obsolete?

A: The 3KP100A-B has been discontinued by Littelfuse Inc. The 5KP100A-B represents the active product line continuation with equivalent voltage ratings and enhanced specifications.

Q: Are both substitutes ROHS3 compliant?

A: The 5KP100A-B is confirmed ROHS3 compliant. The 3KP100A-TP RoHS status is not specified in available documentation.

Q: Can I use the 3KP100A-TP if the 5KP100A-B is unavailable?

A: Yes. The 3KP100A-TP provides identical electrical specifications and current rating to the original 3KP100A-B, with active product status ensuring supply availability.

Q: Do these substitutes require circuit modifications?

A: No. Both substitutes maintain the same voltage specifications, current ratings (or higher), and through-hole mounting compatibility, requiring no circuit design changes.