P4KE47A-B Equivalent & Substitute Parts

Part Overview

The P4KE47A-B is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage transient protection applications. This unidirectional zener diode operates in the 40.2V reverse standoff voltage range with a 64.8V maximum clamping voltage and 6.3A peak pulse current rating. The component is housed in a DO-204AL (DO-41) axial through-hole package and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). Identifying equivalent substitute parts is necessary when the original Littelfuse P4KE47A-B becomes unavailable or when alternative sourcing options are required to maintain supply chain flexibility and project continuity.

Substiute Parts

P4KE47A-B

Littelfuse Inc.In Stock: 1146P4KE47A-B Datasheet

Current PartRFQ

P4KE47A

Taiwan Semiconductor CorporationIn Stock: 785P4KE47A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE47A-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 40.2V
• Voltage - Breakdown (Min): 44.7V
• Voltage - Clamping (Max) @ Ipp: 64.8V
• Current - Peak Pulse (10/1000µs): minimum 6.3A
• Power - Peak Pulse: 400W
• Package / Case: DO-204AL (DO-41) axial through-hole
• Operating Temperature Range: -55°C to 175°C (TJ)
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical voltage specifications, support equivalent or higher peak pulse current ratings, and be housed in the same physical package with identical mounting characteristics. All substitutes must meet or exceed the thermal and regulatory compliance requirements of the original part.

Parameter Comparison

Engineering Selection Recommendations

The P4KE47A manufactured by Taiwan Semiconductor Corporation qualifies as a direct substitute for the P4KE47A-B. Both components share identical voltage specifications (40.2V reverse standoff, 44.7V breakdown minimum, 64.8V clamping maximum), equivalent power ratings (400W peak pulse), and matching thermal operating ranges (-55°C to 175°C). The Taiwan Semiconductor variant provides a marginally higher peak pulse current rating of 6.4A compared to the original 6.3A specification, which represents an improvement in transient handling capability without introducing any compatibility concerns.

Both parts are ROHS3 compliant and maintain the same DO-204AL (DO-41) axial through-hole package configuration, ensuring mechanical and electrical interchangeability in PCB designs. The primary distinction is packaging format: the original part is supplied in bulk, while the substitute is available in Tape & Reel format, which may affect procurement workflows and assembly processes depending on production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the P4KE47A from Taiwan Semiconductor Corporation be used as a direct replacement for the P4KE47A-B from Littelfuse Inc.?

A: Yes. Both components meet identical voltage specifications (40.2V reverse standoff, 44.7V breakdown, 64.8V clamping), operate across the same temperature range (-55°C to 175°C), and are housed in the DO-204AL (DO-41) axial through-hole package. The Taiwan Semiconductor variant provides 6.4A peak pulse current versus 6.3A in the original, representing equivalent or superior performance.

Q: Are there any mechanical compatibility issues when substituting these parts?

A: No. Both the P4KE47A-B and P4KE47A use identical DO-204AL (DO-41) axial package geometry and through-hole mounting configuration. PCB footprints, lead spacing, and soldering requirements remain unchanged.

Q: What is the difference between bulk and Tape & Reel packaging?

A: Bulk packaging supplies components loose in containers, suitable for manual assembly or small-volume production. Tape & Reel packaging provides components on continuous carrier tape in reels, optimized for automated pick-and-place assembly equipment. The electrical and functional characteristics of the component remain identical regardless of packaging format.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the P4KE47A-B and P4KE47A are ROHS3 compliant, REACH unaffected, and carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Moisture sensitivity level is MSL 1 (unlimited) for both variants.

Q: Is the higher peak pulse current rating (6.4A vs 6.3A) significant for circuit design?

A: The 0.1A difference represents a 1.6% increase in peak pulse current capacity. This margin provides additional transient handling capability without requiring circuit redesign. The component remains suitable for all applications originally specified for the P4KE47A-B.