P4KE9.1A-B Equivalent & Substitute Parts

Part Overview

The P4KE9.1A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This through-hole component operates across a wide temperature range and provides reliable clamping performance in DO-204AL (DO-41) axial packaging. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

P4KE9.1A-B

Littelfuse Inc.In Stock: 970P4KE9.1A-B Datasheet

Current PartRFQ

P4KE9.1A

Taiwan Semiconductor CorporationIn Stock: 863P4KE9.1A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE9.1A-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 7.78V
• Voltage - Breakdown (Min): 8.65V
• Voltage - Clamping (Max) @ Ipp: 13.4V
• Current - Peak Pulse (10/1000µs): minimum 30.6A
• Power - Peak Pulse: 400W
• Package / Case: DO-204AL (DO-41) axial through-hole
• Operating Temperature Range: -55°C to 175°C (TJ)
• Type: Zener, Unidirectional

Substitute parts must maintain identical voltage specifications and mechanical compatibility. Variations in packaging format (Bulk vs. Tape & Reel) do not affect electrical substitutability. Peak pulse current ratings equal to or exceeding the main part specification are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The P4KE9.1A manufactured by Taiwan Semiconductor Corporation is a direct electrical and mechanical substitute for the P4KE9.1A-B. Both parts maintain identical voltage specifications (7.78V reverse standoff, 8.65V breakdown minimum, 13.4V clamping maximum) and operate within the same temperature envelope. The Taiwan Semiconductor variant demonstrates a marginally higher peak pulse current rating (31A vs. 30.6A), which provides equivalent or superior performance within the 400W power dissipation limit.

Both parts carry active product status with full RoHS3 compliance and REACH unaffected designation, ensuring regulatory compatibility for current and future applications. Packaging format differences (Bulk vs. Tape & Reel) reflect supply chain and assembly process variations and do not affect circuit-level performance or reliability.

Frequently Asked Questions (FAQ)

Q: Can the P4KE9.1A (Taiwan Semiconductor) be used as a direct replacement for the P4KE9.1A-B (Littelfuse)?

A: Yes. Both parts share identical voltage specifications, clamping characteristics, and operating temperature ranges. The mechanical compatibility (DO-204AL through-hole axial package) and electrical performance parameters are equivalent.

Q: What is the significance of the different peak pulse current ratings (30.6A vs. 31A)?

A: Both ratings operate within the same 400W peak pulse power envelope. The 31A rating of the Taiwan Semiconductor part represents a marginal increase and does not introduce incompatibility. The parts are functionally equivalent for circuit protection applications.

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

A: No. Packaging format reflects supply and assembly logistics only. Electrical performance and mechanical fit remain identical. Component selection should be based on procurement and manufacturing process requirements.

Q: Are there any compliance or certification differences between the two parts?

A: No. Both parts maintain identical RoHS3 compliance status and REACH unaffected designation. Both are active products with no known end-of-life status.

Q: What parameters must remain constant for substitution eligibility?

A: Voltage specifications (reverse standoff, breakdown minimum, and clamping maximum), package type (DO-204AL axial through-hole), operating temperature range (-55°C to 175°C), and power rating (400W) must remain unchanged. Peak pulse current must meet or exceed the original specification.