P4KE7.5-B Equivalent & Substitute Parts

Part Overview

The P4KE7.5-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 6.4V reverse standoff voltage and 11.87V maximum clamping voltage with 36.3A peak pulse current capability in a through-hole DO-204AL (DO-41) axial package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

P4KE7.5-B

Littelfuse Inc.In Stock: 1216P4KE7.5-B Datasheet

Current PartRFQ

P4KE7.5A

Taiwan Semiconductor CorporationIn Stock: 1112P4KE7.5A Datasheet

DirectRFQ

P4KE7.5A-B

Littelfuse Inc.In Stock: 1095P4KE7.5A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE7.5-B is determined by the following critical parameters:

• Reverse Standoff Voltage (Typ): 6.4V — must match exactly to ensure proper circuit protection threshold
• Package / Case: DO-204AL (DO-41) axial through-hole — mechanical and electrical interface compatibility
• Unidirectional Channels: 1 — functional topology requirement
• Operating Temperature Range: -55°C ~ 175°C (TJ) — thermal operating envelope
• Power - Peak Pulse: 400W — energy dissipation capability
• RoHS Status: ROHS3 Compliant — regulatory compliance requirement

The identified substitute parts maintain these core parameters while offering active product status and improved availability. Variations in clamping voltage (11.87V vs. 11.3V) and peak pulse current (36.3A vs. 37A) remain within acceptable engineering tolerances for general-purpose TVS applications, as both values fall within the P4KE series design specifications.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE7.5A and P4KE7.5A-B are qualified substitutes for the obsolete P4KE7.5-B based on electrical parameter compatibility and regulatory compliance.

P4KE7.5A (Taiwan Semiconductor Corporation) is suitable for applications requiring tape and reel packaging for automated assembly processes. This part maintains active product status with ROHS3 compliance and REACH unaffected designation.

P4KE7.5A-B (Littelfuse Inc.) is suitable for applications requiring bulk packaging or direct component sourcing from the original manufacturer. This part maintains active product status with ROHS3 compliance and REACH unaffected designation, offering continuity with the original manufacturer's product line.

Selection between these substitutes should be based on packaging requirements and supply chain preferences rather than electrical performance, as both parts meet the functional specifications of the P4KE7.5-B.

Frequently Asked Questions (FAQ)

Q: Can P4KE7.5A or P4KE7.5A-B be used as direct replacements for P4KE7.5-B?

A: Yes. Both parts share identical reverse standoff voltage (6.4V), operating temperature range (-55°C ~ 175°C), package type (DO-204AL axial through-hole), and power rating (400W). The clamping voltage and peak pulse current variations are within acceptable tolerances for general-purpose TVS applications.

Q: What is the difference between P4KE7.5A and P4KE7.5A-B?

A: The primary difference is packaging format. P4KE7.5A is supplied in tape and reel (TR) format suitable for automated pick-and-place assembly. P4KE7.5A-B is supplied in bulk format. Electrical specifications are functionally equivalent.

Q: Why does the clamping voltage differ between the main part and substitutes?

A: P4KE7.5-B specifies 11.87V maximum clamping voltage, while P4KE7.5A and P4KE7.5A-B specify 11.3V. Both values are within the P4KE7.5 series design envelope and maintain circuit protection function. The lower clamping voltage of the substitutes provides marginally improved transient suppression.

Q: Are all three parts RoHS compliant?

A: Yes. P4KE7.5-B, P4KE7.5A, and P4KE7.5A-B are all ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts use identical DO-204AL (DO-41) axial through-hole package geometry, allowing direct mechanical and electrical substitution without PCB redesign.