P4KE100-B Equivalent & Substitute Parts

Part Overview

The P4KE100-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 85.5V reverse standoff voltage with a maximum clamping voltage of 143.85V at peak pulse current, housed in a DO-204AL (DO-41) axial through-hole package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	85.5	V
Voltage - Breakdown (Min)	90	V
Voltage - Clamping (Max) @ Ipp	143.85	V
Current - Peak Pulse (10/1000µs)	3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the P4KE100-B is determined by strict equivalence across the following electrical and mechanical parameters:

Reverse standoff voltage: 85.5V (Typ)
Peak pulse current rating: 3A
Power dissipation capability: 400W peak pulse
Package configuration: DO-204AL (DO-41) axial through-hole
Operating temperature range: -55°C to 175°C
Unidirectional channel configuration: 1 channel
Zener diode type classification

The substitute parts P4KE100A-B and P4KE100A maintain these core electrical specifications and mechanical compatibility. Variations in clamping voltage (137V versus 143.85V) and breakdown voltage minimums (95V versus 90V) remain within acceptable substitution parameters for general-purpose TVS applications, as both parts share identical standoff voltage, peak pulse current, and power ratings.

Parameter Comparison

Parameter	P4KE100-B (Main)	P4KE100A-B (Substitute)	P4KE100A (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	85.5V	85.5V	85.5V
Voltage - Breakdown (Min)	90V	95V	95V
Voltage - Clamping (Max) @ Ipp	143.85V	137V	137V
Current - Peak Pulse (10/1000µs)	3A	3A	3A
Power - Peak Pulse	400W	400W	400W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

Both P4KE100A-B and P4KE100A are active product alternatives to the obsolete P4KE100-B. Selection between these substitutes is based on the following criteria:

P4KE100A-B (Littelfuse Inc.): Maintains original manufacturer continuity with Littelfuse Inc. and is supplied in bulk packaging. This option is suitable for applications requiring consistent supplier relationships and standard bulk procurement workflows. ROHS3 compliance and REACH unaffected status are confirmed.

P4KE100A (Taiwan Semiconductor Corporation): Provides an alternative source from Taiwan Semiconductor Corporation and is available in Tape & Reel (TR) packaging format. This option is appropriate for automated assembly processes and high-volume production environments. ROHS3 compliance and REACH unaffected status are confirmed.

Both substitutes meet all electrical performance requirements and thermal operating specifications of the original P4KE100-B. The selection between them depends on procurement strategy, packaging requirements, and supply chain preferences rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can P4KE100A-B or P4KE100A be used as direct replacements for P4KE100-B in existing designs?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (85.5V), peak pulse current (3A), power dissipation (400W), and DO-204AL (DO-41) through-hole package configuration. The clamping voltage difference (137V versus 143.85V) and breakdown voltage minimum variation (95V versus 90V) do not prevent functional substitution in general-purpose TVS applications.

Q: What is the difference between P4KE100A-B and P4KE100A?

A: The primary differences are manufacturer and packaging format. P4KE100A-B is supplied by Littelfuse Inc. in bulk packaging, while P4KE100A is supplied by Taiwan Semiconductor Corporation in Tape & Reel (TR) format. Electrical specifications and thermal performance are equivalent.

Q: Are there packaging considerations when switching between these substitutes?

A: Yes. P4KE100A-B arrives in bulk packaging suitable for manual assembly or standard procurement processes. P4KE100A arrives in Tape & Reel (TR) format optimized for automated pick-and-place assembly. Verify your assembly process compatibility before selection.

Q: Do all three parts meet RoHS and environmental compliance requirements?

A: Yes. P4KE100-B, P4KE100A-B, and P4KE100A are all ROHS3 compliant. P4KE100A-B and P4KE100A additionally carry REACH unaffected status confirmation.

Q: Why is the clamping voltage different between the main part and substitutes?

A: The P4KE100-B specifies a maximum clamping voltage of 143.85V, while P4KE100A-B and P4KE100A specify 137V. Both values remain within acceptable operating parameters for general-purpose transient suppression. The lower clamping voltage of the substitutes provides equivalent or improved protection characteristics.

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