MP4KE51AE3 Equivalent & Substitute Parts

Part Overview

The MP4KE51AE3 is an active Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, classified as a unidirectional Zener-type device in the DO-204AL (DO-41) axial through-hole package. This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 43.6V and peak pulse power rating of 400W. The part is qualified to MIL-PRF-19500 military standards and carries an active product status. Equivalent and substitute parts are identified to address inventory availability, alternative sourcing requirements, or specific application constraints while maintaining electrical and mechanical compatibility.

Substiute Parts

MP4KE51AE3

Microchip TechnologyIn Stock: 973MP4KE51AE3 Datasheet

Current PartRFQ

P4KE51A

Diotec SemiconductorIn Stock: 4463P4KE51A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP4KE51AE3 is determined by equivalence in the following critical electrical parameters: reverse standoff voltage (43.6V), breakdown voltage minimum (48.5V), clamping voltage maximum at peak pulse current (70.1V), and peak pulse power rating (400W). The device must maintain unidirectional Zener-type operation with a single channel configuration. Mechanical compatibility is established through through-hole axial package formats (DO-204AL, DO-204AC, or equivalent designations). The substitute part P4KE51A, manufactured by Diotec Semiconductor, satisfies these electrical and mechanical requirements while sharing the same base product number (P4KE51) designation.

Parameter Comparison

Engineering Selection Recommendations

Both the MP4KE51AE3 and P4KE51A are active products with equivalent electrical performance across all critical transient suppression parameters. The MP4KE51AE3 carries military-grade qualification (MIL-PRF-19500) and is RoHS non-compliant. The P4KE51A is manufactured by Diotec Semiconductor with RoHS status listed as not applicable and REACH status as vendor undefined. Selection between these parts should be based on specific application requirements regarding military qualification, regulatory compliance mandates, and package form factor constraints. The MP4KE51AE3 is packaged in DO-204AL (DO-41), while the P4KE51A is packaged in DO-204AC (DO-15). Both are axial through-hole devices suitable for PCB mounting. The P4KE51A demonstrates a marginally higher peak pulse current rating (6.0A versus 5.7A) and an extended upper operating temperature limit (175°C versus 150°C).

Frequently Asked Questions (FAQ)

Q: Can the P4KE51A directly replace the MP4KE51AE3 in all applications?

A: The P4KE51A is electrically equivalent across all critical transient suppression parameters (reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse power). However, the package form factor differs: MP4KE51AE3 uses DO-204AL (DO-41) while P4KE51A uses DO-204AC (DO-15). Both are axial through-hole packages with compatible lead spacing for standard PCB layouts. Verification of PCB footprint compatibility is required before substitution.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching the following parameters: reverse standoff voltage (43.6V), minimum breakdown voltage (48.5V), maximum clamping voltage at peak pulse current (70.1V), peak pulse power rating (400W), device type (Zener), channel configuration (unidirectional, single channel), and mounting technology (through-hole axial). All listed substitute parts meet these criteria.

Q: Does the operating temperature range difference affect substitution suitability?

A: The MP4KE51AE3 operates from -65°C to 150°C, while the P4KE51A operates from -50°C to 175°C. The P4KE51A provides an extended upper temperature capability. For applications requiring operation below -50°C, the MP4KE51AE3 is required. For applications requiring operation above 150°C, the P4KE51A is required. For applications within the overlapping range (-50°C to 150°C), both parts are suitable.

Q: Are there compliance or certification differences between these parts?

A: The MP4KE51AE3 is qualified to MIL-PRF-19500 military standards and carries military-grade classification. The P4KE51A does not list military qualification. Applications requiring military-grade components must use the MP4KE51AE3. The MP4KE51AE3 is RoHS non-compliant, while the P4KE51A RoHS status is listed as not applicable. Applications with RoHS compliance mandates should evaluate regulatory requirements independently.

Q: What is the significance of the base product number P4KE51?

A: The base product number P4KE51 indicates that both the MP4KE51AE3 and P4KE51A are variants within the same product family, sharing identical electrical specifications for the core transient suppression function. The suffix designations (AE3 for Microchip, A for Diotec) indicate manufacturer-specific packaging, qualification, or grading variations.

Q: How does the peak pulse current difference (5.7A versus 6.0A) affect substitution?

A: The P4KE51A peak pulse current rating of 6.0A exceeds the MP4KE51AE3 rating of 5.7A. Both devices maintain the same 400W peak pulse power rating. The higher current capability of the P4KE51A provides additional margin in transient suppression applications. This difference does not preclude substitution; the P4KE51A is suitable for applications designed for the MP4KE51AE3.