MP4KE39AE3 Equivalent & Substitute Parts

Part Overview

The MP4KE39AE3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This through-hole component operates with a reverse standoff voltage of 33.3V and provides clamping at 53.9V with a peak pulse current rating of 7.5A. The device is classified as military-grade and qualified to MIL-PRF-19500 standards. Substitute parts are identified to provide equivalent electrical performance and mechanical compatibility for applications requiring alternative sourcing, packaging formats, or compliance certifications.

Substiute Parts

MP4KE39AE3

Microchip TechnologyIn Stock: 1020MP4KE39AE3 Datasheet

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P4KE39A

Taiwan Semiconductor CorporationIn Stock: 967P4KE39A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP4KE39AE3 is determined by electrical parameter equivalence and mechanical compatibility. The primary substitute identified is the P4KE39A, manufactured by Taiwan Semiconductor Corporation. Both devices share the same base product number (P4KE39) and maintain identical electrical specifications for the critical protection parameters: reverse standoff voltage of 33.3V, breakdown voltage minimum of 37.1V, and clamping voltage maximum of 53.9V at peak pulse current. The devices are functionally interchangeable in through-hole applications using the DO-204AL (DO-41) axial package format.

Substitution eligibility is based on the following key parameters:

• Voltage - Reverse Standoff (Typ): 33.3V
• Voltage - Clamping (Max) @ Ipp: 53.9V
• Package / Case: DO-204AL (DO-41)
• Unidirectional Channel Configuration: 1
• Mounting Type: Through Hole

Parameter Comparison

Engineering Selection Recommendations

Both the MP4KE39AE3 and P4KE39A are active products with equivalent electrical performance in the critical protection parameters. The MP4KE39AE3 is qualified to MIL-PRF-19500 military standards and carries military-grade classification, making it suitable for defense and aerospace applications requiring formal qualification documentation. The P4KE39A is ROHS3 compliant and operates across a wider temperature range (-55 to 175°C versus -65 to 150°C), providing extended thermal performance margins in high-temperature environments.

Selection between these devices should be based on application-specific requirements:

• Military/Aerospace Applications: MP4KE39AE3 is required due to MIL-PRF-19500 qualification
• Commercial Applications with RoHS Compliance Requirements: P4KE39A meets ROHS3 compliance
• High-Temperature Operation: P4KE39A supports extended upper temperature limit of 175°C
• Packaging Requirements: MP4KE39AE3 available in bulk; P4KE39A available in tape and reel format

Both devices maintain identical clamping voltage and reverse standoff specifications, ensuring functional interchangeability in circuit protection applications where these parameters are specified.

Frequently Asked Questions (FAQ)

Q: Can the P4KE39A directly replace the MP4KE39AE3 in all applications?

A: The P4KE39A provides electrical equivalence in all critical protection parameters (reverse standoff voltage, clamping voltage, and peak pulse current). However, direct replacement depends on application requirements. Military applications requiring MIL-PRF-19500 qualification must use the MP4KE39AE3. Commercial applications may use the P4KE39A, which offers ROHS3 compliance and extended temperature range.

Q: What is the difference in peak pulse current between these devices?

A: The MP4KE39AE3 is rated for 7.5A peak pulse current, while the P4KE39A is rated for 7.7A. Both devices maintain the same 400W peak pulse power rating. The P4KE39A provides slightly higher current capacity within the same power envelope.

Q: Are the packages identical?

A: Both devices use the DO-204AL (DO-41) axial through-hole package, ensuring mechanical and pin compatibility. The primary packaging difference is format: MP4KE39AE3 is supplied in bulk, while P4KE39A is supplied in tape and reel format. This affects handling and automated assembly processes but does not impact electrical performance or physical dimensions.

Q: What is the temperature operating range difference?

A: The MP4KE39AE3 operates from -65°C to 150°C (TJ), while the P4KE39A operates from -55°C to 175°C (TJ). The P4KE39A provides a 25°C higher upper temperature limit, beneficial for applications in elevated thermal environments. The MP4KE39AE3 provides a 10°C lower minimum temperature rating.

Q: Does RoHS compliance affect electrical performance?

A: RoHS compliance relates to material composition and environmental restrictions, not electrical performance. Both devices maintain identical electrical specifications for voltage protection parameters. The P4KE39A's ROHS3 compliance indicates adherence to restricted substance directives and may be required for certain commercial and consumer applications.

Q: Can these devices be used interchangeably in PCB designs?

A: Yes, for non-military applications. Both devices share identical DO-204AL (DO-41) package dimensions and electrical protection characteristics. PCB layouts, footprints, and circuit designs require no modification. For military applications, design documentation and qualification records must specify the MIL-PRF-19500 qualified MP4KE39AE3.