P4KE250-B Equivalent & Substitute Parts

Part Overview

The P4KE250-B is a unidirectional Zener transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Manufactured by Littelfuse, this through-hole component operates across a temperature range of -55°C to 175°C and is housed in a DO-204AL (DO-41) axial package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

P4KE250-B

LittelfuseIn Stock: 1116P4KE250-B Datasheet

Current PartRFQ

P4KE250A

Taiwan Semiconductor CorporationIn Stock: 3091P4KE250A Datasheet

DirectRFQ

P4KE250A-B

Littelfuse Inc.In Stock: 1139P4KE250A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE250-B is determined by the following critical parameters:

• Reverse Standoff Voltage: 214V (Typ)
• Peak Pulse Current: 1.2A
• Peak Pulse Power: 400W
• Package Type: DO-204AL (DO-41) through-hole axial
• Unidirectional configuration: 1 channel
• Operating temperature range: -55°C to 175°C

The identified substitute parts maintain these core electrical and mechanical specifications. Variations in clamping voltage (Voltage - Clamping Max @ Ipp) are permissible within the P4KE series design envelope, as this parameter reflects manufacturing tolerance and does not alter the fundamental protection function for the specified standoff and breakdown voltage window.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE250A and P4KE250A-B are active production alternatives to the obsolete P4KE250-B. Selection between these substitutes should be based on procurement and packaging requirements:

P4KE250A (Taiwan Semiconductor Corporation): Available in Tape & Reel packaging with 3040 units in stock. Suitable for automated assembly processes and high-volume applications requiring continuous reel format.

P4KE250A-B (Littelfuse Inc.): Available in bulk packaging with 1090 units in stock. Maintains original manufacturer continuity and is appropriate for manual assembly or lower-volume requirements.

Both substitutes maintain ROHS3 compliance and identical electrical performance within the P4KE250 series specification envelope. The clamping voltage differential (344V versus 361.2V) falls within acceptable manufacturing tolerance for this component class and does not compromise circuit protection function.

Frequently Asked Questions (FAQ)

Q: Can P4KE250A or P4KE250A-B be used as direct replacements for P4KE250-B?

A: Yes. Both parts maintain the critical electrical parameters: 214V reverse standoff voltage, 1.2A peak pulse current, 400W peak pulse power, and identical operating temperature range. The DO-204AL through-hole package is mechanically identical across all three variants.

Q: What is the significance of the clamping voltage difference (361.2V vs. 344V)?

A: Clamping voltage represents the maximum voltage across the diode during peak pulse conditions. The variation between P4KE250-B (361.2V) and the substitutes (344V) reflects normal manufacturing tolerance within the P4KE series design. Both values are within acceptable limits for general-purpose transient suppression applications at the specified 214V standoff voltage.

Q: Does the change from Littelfuse to Taiwan Semiconductor Corporation (P4KE250A) affect compatibility?

A: No. Both manufacturers produce components to the same electrical and mechanical specifications for the P4KE250 series. The part number designation (P4KE250A) indicates conformance to the established series standard.

Q: What packaging considerations apply to these substitutes?

A: P4KE250A is supplied in Tape & Reel format, optimized for automated pick-and-place assembly. P4KE250A-B is supplied in bulk format, suitable for manual assembly or lower-volume applications. Both are through-hole components with identical lead geometry and PCB footprint.

Q: Are there any compliance or certification differences?

A: All three parts are ROHS3 compliant. P4KE250A includes REACH Unaffected status documentation. Both substitutes carry the same EAR99 export classification and HTSUS code as the original part.