M5KP78AE3 Equivalent & Substitute Parts

Part Overview

The M5KP78AE3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This component features a 78V reverse standoff voltage with a 126V maximum clamping voltage and 40A peak pulse current capability in a through-hole DO-204AR axial package. The device is classified as military-grade and qualified to MIL-PRF-19500 standards. Substitute parts are identified to address packaging preferences, compliance requirements, or inventory availability while maintaining equivalent electrical performance within specified operating parameters.

Substiute Parts

M5KP78AE3

Microchip TechnologyIn Stock: 1188M5KP78AE3 Datasheet

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5KP78A

Littelfuse Inc.In Stock: 42885KP78A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the M5KP78AE3 is determined by equivalence in the following critical electrical parameters: reverse standoff voltage (78V typical), breakdown voltage (86.7V minimum), clamping voltage (126V maximum at peak pulse current), and peak pulse current rating (40A). The device must maintain unidirectional operation with a single channel in a through-hole axial package configuration. All substitute parts must operate within the specified voltage and current ranges to ensure functional compatibility in the protected circuit. Packaging format (bulk versus cut tape) and compliance certifications do not affect electrical substitutability but may influence procurement and assembly workflows.

Parameter Comparison

Engineering Selection Recommendations

The 5KP78A manufactured by Littelfuse Inc. is electrically equivalent to the M5KP78AE3 across all critical voltage and current parameters. Both devices are active products with identical reverse standoff voltage (78V), breakdown voltage (86.7V minimum), and clamping voltage (126V maximum). The peak pulse current of the Littelfuse substitute (40.5A) exceeds the Microchip specification (40A), providing equivalent or superior performance in transient suppression.

Key differences exist in compliance and packaging:

The M5KP78AE3 is military-grade, qualified to MIL-PRF-19500, and RoHS non-compliant, supplied in bulk packaging with DO-204AR package designation. The 5KP78A is ROHS3 compliant, REACH affected, supplied in cut tape packaging with P600 package designation. The operating temperature range of the Littelfuse part (-55 to 175°C) exceeds that of the Microchip part (-65 to 150°C), providing broader thermal coverage.

Selection between these parts depends on application requirements: choose the M5KP78AE3 for military-specification compliance or bulk procurement; select the 5KP78A for RoHS3 compliance, extended temperature operation, or cut tape packaging preference.

Frequently Asked Questions (FAQ)

Q: Can the 5KP78A directly replace the M5KP78AE3 in circuit applications?

A: Yes. Both devices share identical electrical specifications for reverse standoff voltage (78V), breakdown voltage (86.7V minimum), and clamping voltage (126V maximum). The 5KP78A peak pulse current (40.5A) meets or exceeds the M5KP78AE3 requirement (40A). Both are unidirectional zener TVS diodes in through-hole axial packages.

Q: What are the package differences between DO-204AR and P600?

A: Both designations refer to through-hole axial packages for TVS diodes. DO-204AR is the Microchip supplier package designation; P600 is the Littelfuse supplier package designation. Physical dimensions and lead spacing are equivalent, permitting direct board-level substitution.

Q: Does the operating temperature range difference affect substitutability?

A: The 5KP78A operating range (-55 to 175°C) is broader than the M5KP78AE3 range (-65 to 150°C). For applications within the M5KP78AE3 temperature limits, both parts perform identically. The 5KP78A provides additional margin for high-temperature environments.

Q: What compliance differences exist between these parts?

A: The M5KP78AE3 is military-grade (MIL-PRF-19500 qualified) and RoHS non-compliant. The 5KP78A is ROHS3 compliant and REACH affected. Select based on regulatory requirements: military applications require the M5KP78AE3; commercial applications with RoHS mandates require the 5KP78A.

Q: Are there inventory or packaging format considerations?

A: The M5KP78AE3 is supplied in bulk packaging; the 5KP78A is supplied in cut tape (CT) format. Bulk packaging suits high-volume manufacturing; cut tape suits automated pick-and-place assembly. Inventory availability differs: M5KP78AE3 (1094 pcs), 5KP78A (4200 pcs).

Q: Can these parts be used interchangeably in new designs?

A: Yes, for general-purpose transient voltage suppression applications. Both devices meet the 78V/126V/40A specification envelope. Design selection should account for compliance requirements (military versus RoHS3) and operating temperature margins.