P4KE91C Equivalent & Substitute Parts

Part Overview

The P4KE91C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 77.8V reverse standoff voltage with 131.25V maximum clamping voltage and 400W peak pulse power rating in a through-hole DO-204AL (DO-41) package. The P4KE91C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Substiute Parts

P4KE91C

Littelfuse Inc.In Stock: 1097P4KE91C Datasheet

Current PartRFQ

P4KE91CA

Taiwan Semiconductor CorporationIn Stock: 904P4KE91CA Datasheet

DirectRFQ

P4KE91CA-AP

Micro Commercial CoIn Stock: 1029P4KE91CA-AP Datasheet

MFR RecommendedRFQ

P4KE91CA-BP

Micro Commercial CoIn Stock: 797P4KE91CA-BP Datasheet

MFR RecommendedRFQ

P4KE91CA-G

Comchip TechnologyIn Stock: 746P4KE91CA-G Datasheet

MFR RecommendedRFQ

P4KE91CA-TP

Micro Commercial CoIn Stock: 1080P4KE91CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4KE91C is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V (all substitutes match)
• Current - Peak Pulse (10/1000µs): 3.3A nominal (primary rating)
• Power - Peak Pulse: 400W (all substitutes match)
• Mounting Type: Through Hole
• Package / Case: DO-204AL, DO-41, Axial
• Bidirectional Channels: 1
• Type: Zener

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in voltage clamping (125V vs. 131.25V) and operating temperature ranges are secondary parameters that do not prevent functional substitution within the defined application envelope. Packaging format (Tape & Reel vs. Bulk) affects procurement and assembly processes but does not alter electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: P4KE91CA-TP (Micro Commercial Co) is the preferred substitute for new designs and production transitions. This part maintains full electrical equivalence with 3.3A peak pulse current, 400W power rating, and -55°C to 175°C operating temperature range. Tape & Reel packaging supports automated assembly processes. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

Alternative Options:

• P4KE91CA (Taiwan Semiconductor Corporation): Active status with matching electrical specifications. Available in Tape & Reel packaging. ROHS3 compliant. Suitable for applications requiring standard packaging formats.

• P4KE91CA-AP and P4KE91CA-BP (Micro Commercial Co): Both maintain electrical equivalence with bulk packaging. Active product status. Appropriate for applications where packaging format flexibility is acceptable.

• P4KE91CA-G (Comchip Technology): Meets core voltage and power specifications. Operating temperature range limited to -55°C to 150°C (vs. 175°C maximum for primary part). Peak pulse current rated at 3.2A (vs. 3.3A). Suitable for applications within the reduced temperature envelope.

All substitutes are through-hole mounted in DO-204AL/DO-41 packages, ensuring direct mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can P4KE91CA directly replace P4KE91C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (77.8V), peak pulse power (400W), and through-hole DO-41 package configuration. The primary difference is product status: P4KE91C is obsolete while P4KE91CA is active. Electrical performance is equivalent for general-purpose transient suppression applications.

Q: What is the significance of the voltage clamping difference (131.25V vs. 125V)?

A: The P4KE91C specifies 131.25V maximum clamping voltage, while substitute parts specify 125V. Both values fall within acceptable transient suppression performance for the 77.8V standoff voltage class. The lower clamping voltage in substitutes provides slightly tighter voltage regulation. Circuit designs must confirm that 125V clamping is acceptable for the protected circuit topology.

Q: Does packaging format (Tape & Reel vs. Bulk) affect electrical performance?

A: No. Packaging format affects procurement, storage, and assembly processes only. Tape & Reel (TR) packaging supports automated pick-and-place assembly, while Bulk packaging is suitable for manual assembly or lower-volume applications. Electrical specifications remain identical regardless of packaging format.

Q: Why is P4KE91CA-G rated at 3.2A instead of 3.3A peak pulse current?

A: P4KE91CA-G (Comchip Technology) specifies 3.2A peak pulse current versus 3.3A for other substitutes. This represents a 3% reduction in peak current handling. Applications requiring the full 3.3A rating should select alternative substitutes. The 400W power rating remains constant across all parts.

Q: Is the reduced operating temperature range of P4KE91CA-G (-55°C to 150°C) a limitation?

A: The P4KE91CA-G maximum junction temperature is 150°C versus 175°C for the primary part and most substitutes. This 25°C reduction may be significant for high-temperature applications or circuits with elevated ambient conditions. Applications operating consistently below 150°C junction temperature are unaffected.

Q: Are all substitute parts ROHS3 compliant?

A: P4KE91CA (Taiwan Semiconductor), P4KE91CA-TP (Micro Commercial), and P4KE91CA-G (Comchip) are explicitly ROHS3 compliant. P4KE91CA-AP and P4KE91CA-BP (Micro Commercial) do not specify RoHS status in available documentation. Confirm RoHS compliance requirements with your procurement or quality department before final part selection.

Q: Can these parts be used interchangeably in production?

A: Yes, within the constraints of electrical specifications and compliance requirements. All substitute parts maintain the core voltage and power ratings necessary for transient suppression. Verify that your circuit design accommodates the 125V clamping voltage (vs. 131.25V original) and confirm any temperature or compliance requirements specific to your application before implementing production transitions.