P4KE56C-B Equivalent & Substitute Parts

Part Overview

The P4KE56C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates in the DO-204AL (DO-41) axial through-hole package with a reverse standoff voltage of 47.8V and peak pulse power rating of 400W. The product is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

P4KE56C-B

Littelfuse Inc.In Stock: 951P4KE56C-B Datasheet

Current PartRFQ

P4KE56CA

Taiwan Semiconductor CorporationIn Stock: 959P4KE56CA Datasheet

DirectRFQ

P4KE56CA-B

Littelfuse Inc.In Stock: 1075P4KE56CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE56C-B are qualified based on the following electrical and mechanical parameters:

• Identical reverse standoff voltage: 47.8V (Typ)
• Identical bidirectional channel configuration: 1 channel
• Identical package type: DO-204AL (DO-41) axial through-hole
• Identical mounting type: Through Hole
• Identical operating temperature range: -55°C ~ 175°C (TJ)
• Identical base product series: P4KE
• Identical power rating: 400W peak pulse
• Identical application category: General Purpose
• Identical RoHS compliance: ROHS3 Compliant
• Identical moisture sensitivity level: MSL 1 (Unlimited)

The substitute parts P4KE56CA and P4KE56CA-B meet all these criteria. Variations in clamping voltage (77V vs. 80.85V) and peak pulse current (5.3A to 5.4A) remain within the functional tolerance band for this product category and do not preclude substitution in general-purpose transient suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE56CA and P4KE56CA-B are active product alternatives to the obsolete P4KE56C-B. Selection between these substitutes should be based on the following factors:

P4KE56CA-B is the preferred substitute when Littelfuse Inc. manufacturer continuity is required for supply chain consistency or when bulk packaging aligns with procurement specifications. This part maintains the original manufacturer identity while offering active product status and full ROHS3 compliance.

P4KE56CA provides an alternative from Taiwan Semiconductor Corporation with identical electrical performance and mechanical compatibility. This option is suitable when multi-source qualification is acceptable and tape & reel packaging meets assembly requirements.

Both substitutes are ROHS3 compliant and carry MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols. The minor variations in clamping voltage and peak pulse current do not affect functional equivalence for general-purpose transient suppression applications within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can P4KE56CA or P4KE56CA-B be used as direct replacements for P4KE56C-B?

A: Yes. Both parts share identical reverse standoff voltage (47.8V), package type (DO-204AL axial through-hole), operating temperature range (-55°C to 175°C), and power rating (400W). They are electrically and mechanically compatible for general-purpose transient suppression applications.

Q: What is the difference between P4KE56CA and P4KE56CA-B?

A: The primary differences are manufacturer (Taiwan Semiconductor Corporation vs. Littelfuse Inc.) and packaging format (Tape & Reel vs. Bulk). Both parts have identical electrical specifications and are active products. P4KE56CA-B maintains the original Littelfuse manufacturer lineage.

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

A: The P4KE56C-B specifies 80.85V maximum clamping voltage, while P4KE56CA and P4KE56CA-B specify 77V. Both values fall within acceptable operating parameters for this product category and do not preclude substitution in general-purpose applications. The lower clamping voltage of the substitutes provides slightly improved transient suppression performance.

Q: Are there any compliance or certification differences?

A: All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. P4KE56CA includes REACH Unaffected status. No compliance barriers exist to substitution.

Q: What packaging options are available?

A: P4KE56C-B and P4KE56CA-B are supplied in bulk packaging. P4KE56CA is supplied in Tape & Reel (TR) format. Selection should align with assembly and procurement requirements.

Q: Is the P4KE56C-B still available?

A: P4KE56C-B is classified as obsolete. P4KE56CA and P4KE56CA-B are active products with current inventory availability and are the recommended alternatives for new designs and ongoing system support.