Equivalent & Substitute Parts for 3KP45C-B TVS Diode

Part Overview

The 3KP45C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This bidirectional Zener diode operates with a 45V reverse standoff voltage and provides 3000W peak pulse power protection in a through-hole P600 axial package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting current availability and compliance requirements.

Substiute Parts

3KP45C-B

Littelfuse Inc.In Stock: 8463KP45C-B Datasheet

Current PartRFQ

5KP45CA-B

LittelfuseIn Stock: 8775KP45CA-B Datasheet

DirectRFQ

15KPA45CAE3/TR13

Microchip TechnologyIn Stock: 95615KPA45CAE3/TR13 Datasheet

MFR RecommendedRFQ

30KP45CA-TP

Micro Commercial CoIn Stock: 94130KP45CA-TP Datasheet

MFR RecommendedRFQ

3KP45CA-TP

Micro Commercial CoIn Stock: 9553KP45CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP45C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 45V (exact match required)
• Voltage - Breakdown (Min): 47.39V to 50.3V (acceptable range)
• Voltage - Clamping (Max) @ Ipp: 72.7V to 77.4V (acceptable range)
• Mounting Type: Through Hole (required)
• Operating Temperature: -55°C ~ 175°C (required)
• RoHS Status: ROHS3 Compliant (required)

The identified substitute parts maintain the same reverse standoff voltage and operating temperature range. Variations in clamping voltage and peak pulse current reflect different power rating classes within the 45V TVS diode family. Package variations (P600 vs. R-6) are noted as mechanical differences that may affect board layout compatibility.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment and long-term availability compared to the obsolete 3KP45C-B.

The 3KP45CA-TP (Micro Commercial Co) provides the closest electrical match with identical 3000W power rating and 41.3A peak pulse current. The primary difference is the package variant (R-6 vs. P600), which requires board layout verification for mechanical compatibility.

The 5KP45CA-B (Littelfuse) offers increased power handling (5000W) while maintaining the original P600 package footprint, suitable for applications requiring enhanced transient protection margin.

The 15KPA45CAE3/TR13 (Microchip Technology) and 30KP45CA-TP (Micro Commercial Co) represent higher power rating options (15000W and 30000W respectively) for applications with more severe transient conditions. These parts maintain the 45V standoff voltage and operating temperature range but differ in package configuration.

Frequently Asked Questions (FAQ)

Q: Can the 3KP45CA-TP directly replace the 3KP45C-B on existing PCBs?

A: The 3KP45CA-TP maintains identical electrical specifications and power rating. However, the package differs (R-6 vs. P600 axial). Physical compatibility depends on the PCB footprint design. Verify hole spacing and lead diameter before substitution.

Q: What is the difference between the 3KP45CA-TP and 5KP45CA-B?

A: Both maintain the 45V reverse standoff voltage. The 5KP45CA-B provides 5000W peak pulse power versus 3000W for the 3KP45CA-TP. The 5KP45CA-B retains the original P600 package. Selection depends on transient energy requirements and available board space.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why do some substitute parts have higher power ratings?

A: The 15KPA45CAE3/TR13 and 30KP45CA-TP represent different power classes within the 45V TVS diode family. Higher ratings provide greater transient suppression capability for circuits experiencing more severe voltage spikes. Selection should match the actual transient energy in the application.

Q: What is the significance of the package designation (P600 vs. R-6)?

A: Both are through-hole axial packages for the same voltage class. P600 and R-6 differ in physical dimensions and lead configuration. PCB footprint compatibility must be confirmed before substitution.