P4KE91 Equivalent & Substitute Parts

Part Overview

The P4KE91 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in through-hole applications. This component features a DO-204AL (DO-41) axial package with a peak pulse power rating of 400W and a reverse standoff voltage of 77.8V.

The P4KE91 is classified as obsolete. Equivalent and substitute parts listed below provide active alternatives that maintain electrical and mechanical compatibility within the specified parameter tolerances for this product category.

Substiute Parts

P4KE91

Littelfuse Inc.In Stock: 993P4KE91 Datasheet

Current PartRFQ

P4KE91A

Taiwan Semiconductor CorporationIn Stock: 1147P4KE91A Datasheet

DirectRFQ

P4KE91A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1118P4KE91A-E3/54 Datasheet

DirectRFQ

P4KE91AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 773P4KE91AHE3/54 Datasheet

DirectRFQ

P4KE91A-AP

Micro Commercial CoIn Stock: 828P4KE91A-AP Datasheet

MFR RecommendedRFQ

P4KE91A-BP

Micro Commercial CoIn Stock: 1221P4KE91A-BP Datasheet

MFR RecommendedRFQ

P4KE91A-G

Comchip TechnologyIn Stock: 801P4KE91A-G Datasheet

MFR RecommendedRFQ

P4KE91A-TP

Micro Commercial CoIn Stock: 943P4KE91A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE91 are qualified based on the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 125V to 131.25V (within acceptable clamping range)
• Current - Peak Pulse (10/1000µs): 3.2A to 3.3A (within tolerance)
• Power - Peak Pulse: 400W (exact match)
• Operating Temperature Range: -55°C to 150°C minimum (P4KE91A-G operates to 150°C; all others to 175°C)
• Mounting Type: Through Hole (exact match)
• Package / Case: DO-204AL, DO-41, Axial (exact match)
• Type: Zener, Unidirectional (exact match)

All substitute parts maintain the same functional classification as TVS diodes for general-purpose transient voltage suppression and are compatible with the original P4KE91 footprint and electrical requirements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status, providing reliable alternatives to the obsolete P4KE91. Selection among these equivalents should be based on the following criteria:

Compliance and Certification: P4KE91AHE3/54 is qualified to AEC-Q101 automotive standards and carries the Automotive grade designation, making it suitable for automotive and high-reliability applications. All other substitutes are general-purpose grade.

RoHS and Environmental Compliance: P4KE91A, P4KE91A-E3/54, P4KE91AHE3/54, and P4KE91A-G are ROHS3 compliant. P4KE91A-AP, P4KE91A-BP, and P4KE91A-TP do not specify RoHS status in available documentation. All listed parts are REACH unaffected or unspecified.

Packaging Format: Tape & Reel (TR) packaging is available from Vishay (P4KE91A-E3/54, P4KE91AHE3/54) for automated assembly. Bulk packaging is available from Taiwan Semiconductor Corporation (P4KE91A), Micro Commercial Co (P4KE91A-AP, P4KE91A-BP, P4KE91A-TP), and Comchip Technology (P4KE91A-G).

Operating Temperature Range: P4KE91A-G operates to 150°C maximum junction temperature, which is 25°C lower than all other substitutes. Applications requiring full -55°C to 175°C operation should use alternative parts.

Peak Pulse Current: P4KE91A-E3/54, P4KE91AHE3/54, and P4KE91A-G specify 3.2A peak pulse current, compared to 3.3A for the original P4KE91 and other substitutes. This represents a 3% reduction in peak pulse capability.

Frequently Asked Questions (FAQ)

Q: Can P4KE91A-G be used in applications requiring the full -55°C to 175°C operating temperature range?

A: No. P4KE91A-G is rated to -55°C to 150°C (TJ) maximum, which is 25°C below the original P4KE91 specification. Applications requiring operation above 150°C junction temperature must use alternative substitutes with extended temperature ratings.

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

A: Tape & Reel (TR) packaging is designed for automated pick-and-place assembly equipment and is supplied on continuous carrier tape. Bulk packaging is supplied loose or in trays and is suitable for manual assembly or lower-volume applications. Both formats are electrically and mechanically equivalent.

Q: Are all substitute parts suitable for automotive applications?

A: Only P4KE91AHE3/54 carries automotive qualification (AEC-Q101) and Automotive grade designation. Other substitutes are classified as general-purpose and should not be used in automotive applications without additional qualification.

Q: What is the significance of the voltage clamping difference between P4KE91 (131.25V) and substitute parts (125V)?

A: The P4KE91 specifies a maximum clamping voltage of 131.25V at peak pulse current, while substitute parts specify 125V. This 6.25V difference represents tighter voltage clamping in the substitute parts, which provides improved transient suppression performance. Both values fall within the acceptable range for this product category and are compatible with circuit designs specified for 77.8V standoff voltage protection.

Q: Can P4KE91A-E3/54 and P4KE91AHE3/54 be used interchangeably?

A: Yes, electrically and mechanically. Both parts are manufactured by Vishay, share identical electrical specifications, and use the same DO-204AL (DO-41) package. The primary difference is that P4KE91AHE3/54 carries AEC-Q101 automotive qualification, while P4KE91A-E3/54 is general-purpose grade.

Q: What does the 3.2A versus 3.3A peak pulse current difference mean for circuit design?

A: The 3.2A specification (P4KE91A-E3/54, P4KE91AHE3/54, P4KE91A-G) represents a 3% reduction in peak pulse current handling compared to 3.3A parts. For most general-purpose transient suppression applications, this difference is negligible. However, circuits designed to operate at the maximum 3.3A specification should use parts rated for 3.3A to maintain design margin.