P4KE39-B Equivalent & Substitute Parts

Part Overview

The P4KE39-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 33.3V reverse standoff voltage with a 56.6V maximum clamping voltage and 7.6A peak pulse current capability in a through-hole DO-204AL (DO-41) axial package. The part is currently listed as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

P4KE39-B

Littelfuse Inc.In Stock: 1167P4KE39-B Datasheet

Current PartRFQ

P4KE39A

Taiwan Semiconductor CorporationIn Stock: 967P4KE39A Datasheet

DirectRFQ

P4KE39A-B

Littelfuse Inc.In Stock: 1183P4KE39A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4KE39-B is determined by strict alignment of electrical and mechanical parameters within the P4KE series. The critical substitution criteria are:

• Reverse standoff voltage: 33.3V (Typ)
• Unidirectional Zener configuration with single channel
• Through-hole axial package (DO-204AL / DO-41)
• Operating temperature range: -55°C to 175°C
• Peak pulse power rating: 400W
• General-purpose transient voltage suppression application

The identified substitutes maintain these core parameters while operating within acceptable tolerances for clamping voltage and peak pulse current. Substitutes are grouped by manufacturer and product status to support procurement decisions.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the P4KE39-B, the P4KE39A-B (Littelfuse Inc., Bulk packaging) is the primary substitute. This part maintains identical reverse standoff voltage, peak pulse power rating, and operating temperature specifications while offering active product status and ROHS3 compliance. The clamping voltage is reduced to 53.9V, representing improved performance within the same application envelope.

The P4KE39A (Taiwan Semiconductor Corporation, Tape & Reel packaging) provides an alternative from a secondary manufacturer with equivalent electrical performance. This variant includes a marginally higher peak pulse current (7.7A versus 7.6A) and maintains all critical electrical and thermal parameters. Selection between these two substitutes should be based on procurement availability, packaging requirements (Bulk versus Tape & Reel), and supply chain preferences.

Both substitutes carry ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can P4KE39A-B be used as a direct replacement for P4KE39-B?

A: Yes. Both parts share identical reverse standoff voltage (33.3V), peak pulse power (400W), operating temperature range (-55°C to 175°C), and through-hole DO-204AL package configuration. The P4KE39A-B offers improved clamping voltage performance (53.9V versus 56.6V) while maintaining all critical electrical parameters.

Q: What is the difference between P4KE39A-B and P4KE39A?

A: Both parts are electrically equivalent with identical reverse standoff voltage and operating temperature range. The primary differences are manufacturer (Littelfuse versus Taiwan Semiconductor) and packaging format (Bulk versus Tape & Reel). Selection depends on procurement requirements and supply chain availability.

Q: Are there packaging differences between these substitutes?

A: Yes. The P4KE39-B and P4KE39A-B are supplied in Bulk packaging, while the P4KE39A is supplied in Tape & Reel format. All three parts use the same DO-204AL (DO-41) axial through-hole package for PCB mounting.

Q: Do these substitutes maintain RoHS compliance?

A: Yes. All three parts are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), meeting current environmental and manufacturing standards.

Q: What are the key electrical parameters that determine substitutability?

A: Substitutability is determined by matching reverse standoff voltage (33.3V), unidirectional Zener configuration, through-hole axial package, peak pulse power rating (400W), and operating temperature range (-55°C to 175°C). Clamping voltage and peak pulse current variations within the specified ranges do not affect functional substitution.