3KP54 Equivalent & Substitute Parts

Part Overview

The 3KP54 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 54V reverse standoff voltage with a 91.46V maximum clamping voltage and 34.4A peak pulse current capability in a P600 axial through-hole package. The 3KP54 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing component sourcing.

Substiute Parts

3KP54

Littelfuse Inc.In Stock: 10573KP54 Datasheet

Current PartRFQ

5KP54A

Littelfuse Inc.In Stock: 18515KP54A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP54 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): Must match at 54V to maintain circuit protection thresholds
• Unidirectional Configuration: Single channel requirement must be preserved
• Package Type: P600 axial through-hole package is mandatory for mechanical compatibility
• Operating Temperature Range: -55°C ~ 175°C (TJ) establishes thermal operating envelope
• RoHS3 Compliance: Required for regulatory alignment

The 5KP54A qualifies as a direct substitute based on matching all critical parameters. While the 5KP54A exhibits higher peak pulse current (58.6A vs. 34.4A) and greater peak pulse power (5000W vs. 3000W), these represent enhanced performance characteristics within the same voltage class and package specification. The lower clamping voltage of the 5KP54A (87.1V vs. 91.46V) provides improved transient suppression performance.

Parameter Comparison

Engineering Selection Recommendations

The 5KP54A is the qualified substitute for the obsolete 3KP54. Selection is based on the following engineering criteria:

Product Status: The 5KP54A maintains active product status with Littelfuse Inc., ensuring ongoing availability and manufacturing support. The 3KP54 obsolete status necessitates transition to an active equivalent.

Regulatory Compliance: Both parts maintain ROHS3 compliance, satisfying environmental and regulatory requirements for new designs and manufacturing operations.

Electrical Compatibility: Matching reverse standoff voltage (54V) and identical unidirectional channel configuration ensure functional equivalence in circuit protection applications. The 5KP54A's enhanced current and power ratings provide performance margin without introducing incompatibility.

Mechanical Compatibility: Identical P600 axial through-hole package specification ensures direct board-level substitution without design modification or PCB rework.

Frequently Asked Questions (FAQ)

Q: Can the 5KP54A be used as a direct replacement for the 3KP54 in existing designs?

A: Yes. The 5KP54A qualifies as a direct substitute. Both parts share identical reverse standoff voltage (54V), unidirectional configuration, operating temperature range (-55°C ~ 175°C), and P600 axial through-hole package specification. No circuit redesign or PCB modification is required.

Q: What are the key differences between the 3KP54 and 5KP54A?

A: The primary differences are product status and power handling capability. The 3KP54 is obsolete with 3000W peak pulse power, while the 5KP54A is active with 5000W peak pulse power. The 5KP54A also provides higher peak pulse current (58.6A vs. 34.4A) and lower maximum clamping voltage (87.1V vs. 91.46V), representing enhanced transient suppression performance.

Q: Are there any package or mounting considerations when substituting the 5KP54A for the 3KP54?

A: No. Both parts use the P600 axial through-hole package with identical mechanical specifications. Direct board-level substitution is possible without PCB modification or component rework.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the 3KP54 and 5KP54A are ROHS3 compliant and carry identical environmental certifications. The 5KP54A additionally carries REACH Unaffected status.

Q: What is the operating temperature range for both parts?

A: Both the 3KP54 and 5KP54A operate across the identical temperature range of -55°C to 175°C (junction temperature), ensuring thermal compatibility in all specified applications.