P4KE47-B Equivalent & Substitute Parts

Part Overview

The P4KE47-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in through-hole applications. This component features a 40.2V reverse standoff voltage and 68.04V maximum clamping voltage with 6.3A peak pulse current capability in a DO-204AL (DO-41) axial package. The P4KE47-B is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P4KE47-B

Littelfuse Inc.In Stock: 807P4KE47-B Datasheet

Current PartRFQ

P4KE47A

Taiwan Semiconductor CorporationIn Stock: 785P4KE47A Datasheet

DirectRFQ

P4KE47A-B

Littelfuse Inc.In Stock: 1146P4KE47A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE47-B are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 40.2V (identical across all parts)
• Package / Case: DO-204AL, DO-41, Axial (identical across all parts)
• Mounting Type: Through Hole (identical across all parts)
• Type: Zener, Unidirectional (identical across all parts)
• Operating Temperature Range: -55°C ~ 175°C (identical across all parts)
• Power - Peak Pulse: 400W (identical across all parts)

The substitute parts P4KE47A-B and P4KE47A maintain the same reverse standoff voltage, package configuration, and thermal operating range. Minor variations in clamping voltage (64.8V vs. 68.04V) and peak pulse current (6.3A to 6.4A) remain within the functional tolerance for general-purpose transient suppression applications where the primary design parameter is the standoff voltage threshold.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE47A-B and P4KE47A are active product alternatives to the obsolete P4KE47-B. Selection between these substitutes is based on the following criteria:

P4KE47A-B (Littelfuse Inc., Bulk Packaging): Maintains original manufacturer continuity with Littelfuse Inc. and offers bulk packaging. This part is ROHS3 compliant and REACH unaffected. Current inventory is 1063 pieces.

P4KE47A (Taiwan Semiconductor Corporation, Tape & Reel Packaging): Provides an alternative manufacturer source with tape and reel packaging suitable for automated assembly processes. This part is ROHS3 compliant and REACH unaffected. Current inventory is 745 pieces.

Both substitutes meet the same RoHS3 compliance and regulatory requirements as the original part. Selection should be based on packaging requirements (bulk vs. tape & reel) and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can P4KE47A-B or P4KE47A be used as direct replacements for P4KE47-B?

A: Yes. Both parts maintain identical reverse standoff voltage (40.2V), package configuration (DO-204AL/DO-41 axial), mounting type (through hole), and operating temperature range (-55°C to 175°C). The clamping voltage difference (64.8V vs. 68.04V) and peak pulse current variation (6.3A to 6.4A) are within functional tolerance for general-purpose transient suppression applications.

Q: What is the difference between P4KE47A-B and P4KE47A?

A: The primary difference is packaging format. P4KE47A-B is supplied in bulk packaging, while P4KE47A is supplied in tape and reel (TR) format. Both are manufactured to the same electrical specifications and are ROHS3 compliant.

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

A: The P4KE47-B specifies 68.04V maximum clamping voltage, while P4KE47A-B and P4KE47A specify 64.8V. Both values are within acceptable design margins for general-purpose transient voltage suppression where the critical design parameter is the 40.2V reverse standoff voltage threshold.

Q: Are all parts RoHS compliant?

A: Yes. The P4KE47-B, P4KE47A-B, and P4KE47A are all ROHS3 compliant. P4KE47A-B and P4KE47A are additionally REACH unaffected.

Q: What packaging should I select for automated assembly?

A: P4KE47A in tape and reel (TR) format is suitable for automated pick-and-place assembly. P4KE47A-B in bulk packaging is suitable for manual assembly or semi-automated processes.