3KP45CA Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 3KP45CA is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 45V reverse standoff voltage, 72.7V maximum clamping voltage, and 3000W peak pulse power rating in a through-hole P600 axial package. The 3KP45CA is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.

Substiute Parts

3KP45CA

Littelfuse Inc.In Stock: 9253KP45CA Datasheet

Current PartRFQ

5KP45CA

Littelfuse Inc.In Stock: 32335KP45CA Datasheet

DirectRFQ

3KP45CA-TP

Micro Commercial CoIn Stock: 9553KP45CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP45CA is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 45V (nominal)
• Voltage - Breakdown: 50V (minimum)
• Voltage - Clamping: 72.7V (maximum at Ipp)
• Bidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C to 175°C
• RoHS Compliance: ROHS3 Compliant

Substitute parts must maintain identical voltage specifications and thermal operating range. Package variations (P600 vs. R-6) and peak pulse current/power ratings are secondary considerations that may differ based on application requirements and circuit design margins.

Parameter Comparison

Engineering Selection Recommendations

5KP45CA (Littelfuse Inc.) - Recommended primary substitute. Active product status ensures long-term availability and supply chain continuity. Maintains identical voltage specifications and thermal range. Increased peak pulse current (70.2A) and power rating (5000W) provide enhanced transient protection margin. Identical P600 axial package enables direct mechanical and electrical substitution without PCB layout modification.

3KP45CA-TP (Micro Commercial Co) - Alternative substitute with active product status. Maintains identical voltage specifications, thermal range, and peak pulse current rating (41.3A). Package variant (R-6 axial) requires verification of PCB footprint compatibility and lead spacing before implementation. Suitable for applications where component sourcing from multiple manufacturers is required.

Frequently Asked Questions (FAQ)

Q: Can the 5KP45CA replace the 3KP45CA in all applications?

A: Yes, within the scope of voltage and thermal specifications. The 5KP45CA maintains identical reverse standoff voltage (45V), breakdown voltage (50V), and clamping voltage (72.7V). The increased peak pulse current (70.2A) and power rating (5000W) compared to the original 3KP45CA (41.3A, 3000W) provide additional transient suppression capability. Identical P600 package enables direct substitution.

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

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 represent different physical form factors with potentially different lead spacing and body dimensions. PCB footprint compatibility must be verified before selecting the 3KP45CA-TP variant with R-6 packaging.

Q: Are all substitute parts RoHS compliant?

A: The 5KP45CA is confirmed ROHS3 compliant. The 3KP45CA-TP RoHS status is not specified in available documentation and should be verified with the manufacturer or distributor before procurement for applications requiring RoHS compliance.

Q: Why is the 3KP45CA obsolete?

A: Product obsolescence is determined by the manufacturer. The 5KP45CA serves as the active replacement in the Littelfuse product line, offering equivalent voltage protection with enhanced power handling capability.

Q: Can I use the 3KP45CA-TP as a direct drop-in replacement?

A: Electrical substitution is valid based on voltage and thermal specifications. Mechanical substitution requires PCB footprint verification due to the R-6 package variant. Confirm lead spacing and hole diameter compatibility with your circuit board design before implementation.