P4KE43C-B Equivalent & Substitute Parts

Part Overview

The P4KE43C-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) 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 essential for ongoing system support and new design implementations.

Substiute Parts

P4KE43C-B

Littelfuse Inc.In Stock: 990P4KE43C-B Datasheet

Current PartRFQ

P4KE43CA

Taiwan Semiconductor CorporationIn Stock: 860P4KE43CA Datasheet

DirectRFQ

P4KE43CA-B

LittelfuseIn Stock: 836P4KE43CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE43C-B is determined by the following critical parameters:

• Reverse standoff voltage must match at 36.8V (Typ)
• Breakdown voltage minimum must fall within acceptable range (38.75V or higher)
• Clamping voltage must not exceed application limits
• Peak pulse current rating must support the 6.9A requirement
• Peak pulse power rating must equal or exceed 400W
• Package type must remain DO-204AL (DO-41) through-hole axial configuration
• Operating temperature range must span -55°C to 175°C (TJ)
• Bidirectional channel count must equal 1
• Zener diode type classification must be maintained

The P4KE series base product number ensures compatibility within the substitute group. Substitute parts must maintain identical mechanical and electrical interfaces while meeting or exceeding the specified performance envelope.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE43CA and P4KE43CA-B qualify as functional equivalents to the obsolete P4KE43C-B based on matching critical electrical and mechanical parameters. The primary distinction between substitute options relates to product status and packaging format:

P4KE43CA (Taiwan Semiconductor Corporation) is an active product supplied in Tape & Reel (TR) packaging, suitable for automated assembly environments and high-volume production runs. This part maintains full ROHS3 compliance and REACH unaffected status.

P4KE43CA-B (Littelfuse) is an active product supplied in Bulk packaging, suitable for manual assembly or lower-volume applications. This part also maintains full ROHS3 compliance and REACH unaffected status, with the advantage of remaining within the original manufacturer's product line.

Both substitutes demonstrate improved clamping voltage performance (59.3V versus 62.27V), resulting in tighter voltage regulation. The P4KE43CA offers marginally higher peak pulse current (7A versus 6.9A). Selection between these options should be based on procurement requirements, assembly methodology, and supply chain preferences rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can P4KE43CA or P4KE43CA-B be used as direct replacements for P4KE43C-B in existing designs?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (36.8V), operating temperature range (-55°C to 175°C), package configuration (DO-204AL through-hole axial), and peak pulse power rating (400W). The electrical performance envelope is compatible with the original specification.

Q: What is the difference between P4KE43CA and P4KE43CA-B?

A: The primary differences are manufacturer (Taiwan Semiconductor Corporation versus Littelfuse), product status (both active), and packaging format (Tape & Reel versus Bulk). Electrical specifications are functionally equivalent. P4KE43CA-B maintains continuity with the original Littelfuse manufacturer line.

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

A: P4KE43CA and P4KE43CA-B specify a maximum clamping voltage of 59.3V compared to 62.27V in the P4KE43C-B. This represents improved voltage regulation performance and does not constitute a limitation. Applications designed for the original 62.27V specification will operate within acceptable margins at 59.3V.

Q: Are there packaging considerations when switching between these parts?

A: P4KE43CA is supplied in Tape & Reel format for automated pick-and-place assembly. P4KE43CA-B is supplied in Bulk format for manual handling. Both use identical through-hole DO-204AL (DO-41) axial package geometry and are mechanically interchangeable on PCBs. Selection depends on assembly process requirements.

Q: Do all three parts meet the same compliance standards?

A: Yes. P4KE43C-B, P4KE43CA, and P4KE43CA-B are all ROHS3 compliant with MSL rating of 1 (Unlimited). P4KE43CA and P4KE43CA-B additionally carry REACH unaffected status documentation.