P4KE400-B Equivalent & Substitute Parts

Part Overview

The P4KE400-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This component features a 342V reverse standoff voltage with a 575.4V maximum clamping voltage and 750mA peak pulse current capability in a through-hole DO-204AL (DO-41) package format.

The P4KE400-B is classified as obsolete. Equivalent and substitute parts are available from active product lines within the same P4KE series, offering comparable electrical performance with improved availability and current manufacturing status.

Substiute Parts

P4KE400-B

LittelfuseIn Stock: 754P4KE400-B Datasheet

Current PartRFQ

P4KE400A

Taiwan Semiconductor CorporationIn Stock: 1152P4KE400A Datasheet

DirectRFQ

P4KE400A-B

Littelfuse Inc.In Stock: 919P4KE400A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE400-B are qualified based on the following electrical and mechanical parameters:

• Reverse standoff voltage: 342V (identical)
• Package format: DO-204AL / DO-41 axial through-hole (identical)
• Mounting type: Through-hole (identical)
• Zener diode type: Unidirectional, single channel (identical)
• Operating temperature range: -55°C ~ 175°C (identical)
• Peak pulse power rating: 400W (identical)
• RoHS3 compliance: Required
• Moisture sensitivity level: MSL 1 (Unlimited)

Substitute parts must maintain these core parameters to ensure direct functional equivalence in circuit applications. Variations in clamping voltage and peak pulse current within the P4KE series are acceptable provided they remain within the specified electrical operating window for the application.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE400A and P4KE400A-B are active product alternatives to the obsolete P4KE400-B. Selection between these substitutes is determined by availability, packaging requirements, and supply chain considerations.

P4KE400A-B (Littelfuse Inc., Bulk packaging) maintains the original manufacturer lineage and identical peak pulse current specification (750mA), providing the closest functional match to the P4KE400-B.

P4KE400A (Taiwan Semiconductor Corporation, Tape & Reel packaging) offers marginally improved peak pulse current (760mA) and is suitable for automated assembly processes requiring tape-and-reel format.

Both alternatives demonstrate lower maximum clamping voltage (548V versus 575.4V) and higher minimum breakdown voltage (380V versus 360V) compared to the main part. These variations remain within acceptable tolerance for general-purpose transient voltage suppression applications and do not compromise circuit protection functionality.

All substitute parts maintain identical reverse standoff voltage, operating temperature range, power rating, and RoHS3 compliance status.

Frequently Asked Questions (FAQ)

Q: Can P4KE400A or P4KE400A-B be used as direct replacements for P4KE400-B?

A: Yes. Both parts share identical reverse standoff voltage (342V), package format (DO-204AL / DO-41), mounting type (through-hole), and operating temperature range (-55°C ~ 175°C). The clamping voltage and breakdown voltage variations are within acceptable engineering tolerances for general-purpose TVS applications.

Q: What is the difference between P4KE400A and P4KE400A-B?

A: The primary differences are manufacturer (Taiwan Semiconductor Corporation versus Littelfuse Inc.), packaging format (Tape & Reel versus Bulk), and peak pulse current specification (760mA versus 750mA). Electrical performance and package dimensions remain equivalent.

Q: Does packaging format affect circuit performance?

A: No. Tape & Reel and Bulk packaging formats contain identical components. Packaging selection is determined by assembly process requirements and inventory management practices, not electrical performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. P4KE400A and P4KE400A-B are both ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance status of the original P4KE400-B.

Q: Why is the clamping voltage lower in the substitute parts?

A: P4KE400A and P4KE400A-B specify 548V maximum clamping voltage compared to 575.4V for P4KE400-B. This variation reflects manufacturing tolerance and specification refinement within the P4KE series. Both values remain within acceptable operating parameters for transient voltage suppression in general-purpose applications.