P4KE91A-B Equivalent & Substitute Parts

Part Overview

The P4KE91A-B is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This unidirectional Zener diode operates with a reverse standoff voltage of 77.8V and provides clamping at 125V maximum, with a peak pulse current rating of 3.3A. The component is housed in a DO-204AL (DO-41) axial through-hole package and is ROHS3 compliant. Substitute parts are identified when electrical parameters and mechanical specifications align with the original component, enabling direct replacement in circuit designs without functional compromise.

Substiute Parts

P4KE91A-B

LittelfuseIn Stock: 1179P4KE91A-B Datasheet

Current PartRFQ

P4KE91A

Taiwan Semiconductor CorporationIn Stock: 1147P4KE91A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE91A-B is determined by strict alignment of the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• Voltage - Breakdown (Min): 86.5V
• Voltage - Clamping (Max) @ Ipp: 125V
• Current - Peak Pulse (10/1000µs): 3.3A
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C to 175°C (TJ)
• Package / Case: DO-204AL (DO-41) Axial
• Mounting Type: Through Hole
• Unidirectional Channels: 1
• Type: Zener

The P4KE91A manufactured by Taiwan Semiconductor Corporation qualifies as a direct substitute. Both components share identical electrical specifications, thermal operating range, and mechanical package configuration. The primary distinction is packaging format: the original part is supplied in Bulk packaging, while the substitute is available in Tape & Reel (TR) format. This packaging difference does not affect electrical performance or circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the P4KE91A-B (Littelfuse) and P4KE91A (Taiwan Semiconductor) are active products with ROHS3 compliance and REACH unaffected status. Selection between these components should be based on packaging requirements and supply chain considerations. The Littelfuse variant in Bulk packaging is suitable for low-volume applications and prototype development. The Taiwan Semiconductor variant in Tape & Reel format is optimized for automated assembly and high-volume production environments. Both components meet identical electrical and thermal specifications, ensuring functional equivalence in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the P4KE91A (Taiwan Semiconductor) replace the P4KE91A-B (Littelfuse) in existing designs?

A: Yes. Both components are electrically and mechanically identical. The P4KE91A operates at the same voltage levels (77.8V standoff, 125V clamping), current ratings (3.3A peak pulse), and temperature range (-55 to 175°C). The DO-204AL (DO-41) axial through-hole package is identical, enabling direct pin-for-pin substitution.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Bulk packaging supplies individual components loose, suitable for manual assembly and small-quantity applications. Tape & Reel packaging places components on continuous tape for automated pick-and-place assembly systems. Electrical performance is identical; packaging choice depends on assembly method and production volume.

Q: Are both parts RoHS compliant?

A: Yes. Both the P4KE91A-B and P4KE91A are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What applications are these TVS diodes suitable for?

A: Both components are rated for general-purpose transient voltage suppression. They are not designated for power line protection applications. Typical uses include protection of sensitive circuits against voltage transients in industrial control, telecommunications, and consumer electronics.

Q: Can these components be used interchangeably in automated assembly?

A: The Taiwan Semiconductor P4KE91A in Tape & Reel format is optimized for automated assembly. The Littelfuse P4KE91A-B in Bulk packaging requires manual placement. Both deliver identical electrical performance once installed.