P4KE12-B Equivalent & Substitute Parts

Part Overview

The P4KE12-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. It features a 10.2V reverse standoff voltage with a 17.54V maximum clamping voltage and 24.6A peak pulse current capability in a through-hole DO-204AL (DO-41) axial package. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

P4KE12-B

Littelfuse Inc.In Stock: 1047P4KE12-B Datasheet

Current PartRFQ

P4KE12A

Taiwan Semiconductor CorporationIn Stock: 30224P4KE12A Datasheet

DirectRFQ

P4KE12A-B

Littelfuse Inc.In Stock: 977P4KE12A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4KE12-B is determined by strict equivalence across the following critical parameters:

• Reverse standoff voltage: 10.2V (Typ)
• Unidirectional Zener type configuration
• Through-hole axial mounting (DO-204AL / DO-41 package)
• Operating temperature range: -55°C to 175°C
• RoHS3 compliance and MSL Level 1 rating
• General-purpose TVS application category

The substitute parts P4KE12A and P4KE12A-B maintain these core electrical and mechanical specifications. Variations in clamping voltage (16.7V vs. 17.54V) and peak pulse current (25A vs. 24.6A) remain within the functional tolerance band for this component class and do not preclude substitution when the standoff voltage and package form factor are preserved.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE12A and P4KE12A-B are qualified substitutes for the obsolete P4KE12-B based on electrical parameter equivalence and regulatory compliance.

P4KE12A-B (Littelfuse Inc.) maintains original manufacturer continuity and is available in bulk packaging matching the original part's supply format. This option provides design consistency with the original specification.

P4KE12A (Taiwan Semiconductor Corporation) offers significantly higher inventory availability (30200 units) and is supplied in tape and reel format, supporting automated assembly workflows. This part meets all electrical and compliance requirements for direct substitution.

Selection between these alternatives should be based on procurement requirements, packaging format compatibility with assembly processes, and inventory availability timelines.

Frequently Asked Questions (FAQ)

Q: Can P4KE12A replace P4KE12-B in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (10.2V), operating temperature range (-55°C to 175°C), package form factor (DO-204AL axial), and regulatory compliance (ROHS3, MSL Level 1). The clamping voltage difference (16.7V vs. 17.54V) and peak pulse current variation (25A vs. 24.6A) are within functional tolerance for general-purpose TVS applications.

Q: What is the difference between P4KE12A and P4KE12A-B?

A: Both parts are electrically equivalent with identical electrical parameters. The primary differences are manufacturer (Taiwan Semiconductor Corporation vs. Littelfuse Inc.), packaging format (tape and reel vs. bulk), and inventory availability. P4KE12A-B maintains the original Littelfuse manufacturer designation.

Q: Are there packaging considerations when substituting these parts?

A: Yes. P4KE12A is supplied in tape and reel format, suitable for automated pick-and-place assembly. P4KE12A-B is supplied in bulk packaging. Verify that your assembly process and equipment are compatible with the selected packaging format before procurement.

Q: Does the higher inventory of P4KE12A affect its electrical performance?

A: No. Inventory levels do not impact electrical performance or reliability. Higher availability reflects market demand and supply chain positioning, not component quality or specification differences.

Q: Are all three parts RoHS3 compliant?

A: Yes. P4KE12-B, P4KE12A, and P4KE12A-B are all ROHS3 compliant with MSL Level 1 (unlimited moisture sensitivity), meeting current environmental and regulatory requirements.