P4KE43-B Equivalent & Substitute Parts

Part Overview

The P4KE43-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This unidirectional zener diode operates in the DO-204AL (DO-41) through-hole package with a reverse standoff voltage of 36.8V and peak pulse power rating of 400W. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

P4KE43-B

Littelfuse Inc.In Stock: 1013P4KE43-B Datasheet

Current PartRFQ

P4KE43A

Taiwan Semiconductor CorporationIn Stock: 1026P4KE43A Datasheet

DirectRFQ

P4KE43A-B

Littelfuse Inc.In Stock: 1244P4KE43A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by matching the following critical parameters:

• Reverse standoff voltage (Typ): 36.8V
• Unidirectional channel configuration: 1 channel
• Package type: DO-204AL (DO-41) through-hole axial
• Operating temperature range: -55°C ~ 175°C (TJ)
• Power rating class: 400W peak pulse
• Application category: General Purpose

The substitute parts P4KE43A and P4KE43A-B meet these core electrical and mechanical requirements. Both maintain the same reverse standoff voltage, unidirectional topology, through-hole package configuration, and temperature operating range. Variations in clamping voltage and peak pulse current are within the allowable parameter ranges for this product category and do not preclude functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE43A and P4KE43A-B are active production alternatives to the obsolete P4KE43-B. Selection between these substitutes should be based on the following factors:

P4KE43A-B is manufactured by Littelfuse Inc., the original manufacturer of the P4KE43-B, and is available in bulk packaging. This option maintains supply chain continuity with the original manufacturer while providing active product status and full compliance certifications (ROHS3, EAR99).

P4KE43A is manufactured by Taiwan Semiconductor Corporation and is available in tape and reel packaging. This option provides active product status and equivalent compliance certifications (ROHS3, REACH Unaffected, EAR99), with slightly higher peak pulse current capability (7A versus 6.9A) and lower clamping voltage (59.3V versus 62.27V).

Both parts maintain identical reverse standoff voltage, operating temperature range, power rating, and package configuration. Packaging format (bulk versus tape and reel) should be selected based on procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can P4KE43A or P4KE43A-B be used as direct replacements for P4KE43-B in existing designs?

A: Yes. Both substitute parts maintain the same reverse standoff voltage (36.8V), unidirectional channel configuration, DO-204AL through-hole package, and operating temperature range (-55°C ~ 175°C). Electrical performance differences are within acceptable substitution parameters for general-purpose TVS applications.

Q: What is the difference between P4KE43A and P4KE43A-B?

A: The primary differences are manufacturer and packaging format. P4KE43A-B is manufactured by Littelfuse Inc. in bulk packaging, while P4KE43A is manufactured by Taiwan Semiconductor Corporation in tape and reel packaging. Electrical specifications are equivalent with minor variations in clamping voltage and peak pulse current.

Q: Why does the clamping voltage differ between the main part and substitutes?

A: P4KE43-B specifies a maximum clamping voltage of 62.27V, while both P4KE43A and P4KE43A-B specify 59.3V. Both values fall within the acceptable operating range for this product category and do not affect functional substitution for general-purpose transient voltage suppression.

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

A: All three parts are ROHS3 compliant with MSL rating of 1 (Unlimited) and ECCN classification EAR99. P4KE43A additionally carries REACH Unaffected status. These certifications do not create substitution barriers.

Q: Which substitute should be selected for new designs?

A: Selection should be based on packaging requirements and supply chain preferences. P4KE43A-B maintains continuity with the original Littelfuse manufacturer. P4KE43A offers tape and reel packaging suitable for automated assembly processes.