MP6KE18AE3 Equivalent & Substitute Parts

Part Overview

The MP6KE18AE3 is an active-status Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This unidirectional zener-type TVS diode features a 15.3V reverse standoff voltage and 25.2V maximum clamping voltage, with a peak pulse current rating of 24A and 600W peak pulse power dissipation. The device is housed in a T-18 axial through-hole package and qualifies to MIL-PRF-19500 military specifications.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for specific board layouts, or when sourcing from multiple suppliers is needed to optimize inventory and procurement strategies.

Substiute Parts

MP6KE18AE3

Microchip TechnologyIn Stock: 715MP6KE18AE3 Datasheet

Current PartRFQ

P6KE18A

Fairchild SemiconductorIn Stock: 45230P6KE18A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP6KE18AE3 is determined by strict equivalence of the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 15.3V
• Voltage - Breakdown (Min): 17.1V
• Voltage - Clamping (Max) @ Ipp: 25.2V
• Current - Peak Pulse (10/1000µs): minimum 24A
• Power - Peak Pulse: 600W
• Type: Zener, Unidirectional (1 channel)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: Axial configuration (T-18 or DO-15/DO-204AC equivalent)

The P6KE18A from Fairchild Semiconductor meets all electrical equivalence criteria and provides compatible through-hole axial packaging. The substitute maintains identical voltage ratings and clamping characteristics while offering a slightly higher peak pulse current rating (25A versus 24A), which does not compromise circuit protection and provides additional design margin.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (MP6KE18AE3): The MP6KE18AE3 is the specified component and maintains active product status with MIL-PRF-19500 military qualification. This part is suitable for applications requiring military-grade compliance and the specific T-18 package format. Current inventory of 690 pieces supports immediate procurement.

Substitute Part (P6KE18A): The P6KE18A is an active-status equivalent that provides identical electrical protection characteristics with compatible through-hole axial packaging (DO-15/DO-204AC). The substitute offers a higher peak pulse current rating (25A) and an extended operating temperature range (-50°C ~ 175°C), providing additional design margin. Significantly higher inventory availability (45,200 pieces) supports supply chain continuity and cost optimization. Both parts carry the same ECCN and HTSUS classifications.

Selection between these parts depends on specific packaging constraints and compliance requirements. The T-18 package of the primary part and the DO-15 package of the substitute are both standard axial through-hole formats and are mechanically interchangeable in most circuit board layouts.

Frequently Asked Questions (FAQ)

Q: Can the P6KE18A directly replace the MP6KE18AE3 in my circuit?

A: Yes. Both devices are unidirectional zener TVS diodes with identical voltage ratings (15.3V standoff, 25.2V clamping) and equivalent power dissipation (600W). The P6KE18A's higher peak pulse current rating (25A versus 24A) provides additional protection margin. Both are through-hole axial packages suitable for standard PCB mounting.

Q: What is the difference between the T-18 and DO-15 packages?

A: Both are standard axial through-hole packages formats for discrete diodes. The T-18 is Microchip's package designation, while DO-15 (DO-204AC) is the industry-standard equivalent used by Fairchild. The physical dimensions and lead spacing are compatible for most circuit board layouts, though specific PCB footprints should be verified against manufacturer datasheets.

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

A: The MP6KE18AE3 carries MIL-PRF-19500 military qualification. The P6KE18A does not list this qualification in the provided specifications. If military-grade certification is a circuit requirement, the MP6KE18AE3 is the appropriate selection. Both parts are RoHS non-compliant and REACH unaffected, with identical ECCN and HTSUS classifications.

Q: Why does the P6KE18A have a wider operating temperature range?

A: The P6KE18A operates from -50°C to 175°C, compared to the MP6KE18AE3 range of -65°C to 150°C. The substitute's upper temperature limit is 25°C higher, which may provide advantages in high-temperature applications. The primary part's lower temperature limit (-65°C) extends 15°C lower, which may be required for extreme cold-environment applications.

Q: Can I use these parts interchangeably in production?

A: Electrical substitution is valid based on identical voltage and power ratings. However, physical package differences (T-18 versus DO-15) require PCB footprint verification. If your design specifies a particular package format, confirm that the substitute's package is compatible with your board layout before implementing production changes.