3KP45C Equivalent & Substitute Parts

Part Overview

The 3KP45C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 45V reverse standoff voltage rating with a 76.34V maximum clamping voltage and 41.3A peak pulse current capability in a through-hole P600 axial package. The 3KP45C is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

3KP45C

Littelfuse Inc.In Stock: 8363KP45C Datasheet

Current PartRFQ

5KP45CA

Littelfuse Inc.In Stock: 32335KP45CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP45C is determined by the following critical parameters:

• Voltage Rating Compatibility: Reverse standoff voltage of 45V and breakdown voltage minimum of 47.39V establish the protection threshold. Substitute parts must maintain identical or tighter voltage specifications to ensure equivalent circuit protection.
• Package and Mounting: The P600 axial through-hole package is a physical and electrical requirement. Substitute parts must use the same package designation to ensure direct board-level compatibility without redesign.
• Bidirectional Configuration: Single-channel bidirectional operation is required for the application. Substitute parts must maintain this channel configuration.
• Temperature Range: Operating temperature range of -55°C to 175°C defines the thermal operating envelope. Substitute parts must support this range.
• Compliance Standards: RoHS3 compliance is mandatory. Substitute parts must maintain equivalent or superior compliance status.

The 5KP45CA qualifies as a direct substitute based on matching voltage ratings, identical package specification, equivalent bidirectional configuration, and maintained RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The 5KP45CA is a direct functional substitute for the 3KP45C. Both components share identical voltage ratings, package specifications, and operating temperature ranges. The 5KP45CA offers enhanced performance characteristics with higher peak pulse current (70.2A versus 41.3A) and greater peak pulse power dissipation (5000W versus 3000W), providing superior transient protection capability within the same physical footprint.

The 5KP45CA maintains active product status with full RoHS3 compliance, ensuring long-term availability and regulatory alignment. The transition from the obsolete 3KP45C to the 5KP45CA requires no circuit redesign, as both components are pin-compatible and functionally equivalent at the specified voltage protection level.

Frequently Asked Questions (FAQ)

Q: Can the 5KP45CA directly replace the 3KP45C without circuit modification?

A: Yes. Both components share identical reverse standoff voltage (45V), breakdown voltage specifications, clamping voltage characteristics, and P600 axial through-hole package. Direct substitution is possible without circuit redesign.

Q: What is the significance of the higher peak pulse current and power rating in the 5KP45CA?

A: The 5KP45CA provides 70.2A peak pulse current and 5000W power dissipation compared to the 3KP45C's 41.3A and 3000W. These enhanced ratings indicate greater transient suppression capability. The substitute part handles more severe transient events while maintaining the same voltage protection threshold.

Q: Are there any compliance or certification differences between the two parts?

A: Both the 3KP45C and 5KP45CA are ROHS3 compliant. The 5KP45CA additionally carries REACH Unaffected status. No compliance barriers exist for substitution.

Q: Why is the 3KP45C obsolete while the 5KP45CA remains active?

A: The 5KP45CA represents the current generation of Littelfuse's 45V bidirectional TVS diode product line. The higher power rating and improved performance characteristics of the 5KP45CA have superseded the earlier 3KP45C design in the manufacturer's active portfolio.

Q: Are the clamping voltage specifications identical between the two parts?

A: The 5KP45CA exhibits a slightly lower maximum clamping voltage (72.7V) compared to the 3KP45C (76.34V). Both values remain within acceptable protection parameters for 45V standoff voltage applications. The lower clamping voltage in the substitute part represents improved transient suppression efficiency.