M5KP28AE3 Equivalent & Substitute Parts

Part Overview

The M5KP28AE3 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 28V reverse standoff voltage and provides 5000W peak pulse power dissipation capability. The part is classified as Active and carries Military grade qualification under MIL-PRF-19500. Substitute parts are identified to address inventory availability, packaging preferences, or compliance requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.5	V
Current - Peak Pulse (10/1000µs)	110	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AR, Axial	—
Unidirectional Channels	1	—
Type	Zener	—

Substitute Part Grouping Explanation

Substitution of the M5KP28AE3 is determined by strict equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage of 28V and breakdown voltage minimum of 31.1V
Clamping Performance: Maximum clamping voltage at peak pulse current (Ipp) of 45.4–45.5V
Peak Pulse Current: Rated current capacity of 110–112.3A at 10/1000µs pulse duration
Power Dissipation: Peak pulse power rating of 5000W
Topology: Unidirectional Zener TVS diode with single channel
Mounting Configuration: Through-hole axial package format

The substitute part 5KP28A from Littelfuse Inc. meets all electrical parameter requirements within specified tolerances. Differences in packaging format (P600 vs. DO-204AR), temperature operating range, and RoHS compliance status are secondary considerations that do not affect electrical substitutability.

Parameter Comparison

Parameter	M5KP28AE3 (Microchip)	5KP28A (Littelfuse)	Match Status
Voltage - Reverse Standoff (Typ)	28V	28V	Equivalent
Voltage - Breakdown (Min)	31.1V	31.1V	Equivalent
Voltage - Clamping (Max) @ Ipp	45.5V	45.4V	Equivalent
Current - Peak Pulse (10/1000µs)	110A	112.3A	Equivalent
Power - Peak Pulse	5000W	5000W	Equivalent
Type	Zener	Zener	Equivalent
Unidirectional Channels	1	1	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature Range	-65°C to 150°C	-55°C to 175°C	Substitute Range Wider
Package / Case	DO-204AR, Axial	P600, Axial	Different Package Code
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

M5KP28AE3 (Microchip Technology) is the primary specification. This part carries Military grade qualification under MIL-PRF-19500 and is suitable for applications requiring military-level component certification. The part is Active and maintains full inventory availability (808 pcs).

5KP28A (Littelfuse Inc.) serves as a direct electrical substitute. This part meets all critical voltage, current, and power parameters within acceptable tolerances. The substitute offers an extended operating temperature range (-55°C to 175°C vs. -65°C to 150°C) and achieves RoHS3 compliance, which may be advantageous for applications subject to environmental or regulatory restrictions. The P600 package is mechanically compatible with DO-204AR in through-hole applications, though PCB layout verification is required for specific board designs. Inventory availability is significantly higher (14,800 pcs).

Selection between these parts depends on certification requirements (Military grade vs. RoHS compliance) and packaging constraints specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28A replace the M5KP28AE3 in all applications?

A: The 5KP28A is electrically equivalent across all critical parameters: voltage rating, clamping performance, peak pulse current, and power dissipation. However, applications requiring Military grade certification (MIL-PRF-19500) must retain the M5KP28AE3. Applications subject to RoHS compliance mandates may require the 5KP28A.

Q: Are the DO-204AR and P600 packages mechanically interchangeable?

A: Both packages are axial through-hole formats with compatible lead spacing for standard PCB hole patterns. Physical package dimensions differ; verification against specific PCB footprint requirements is necessary before substitution.

Q: What is the significance of the different operating temperature ranges?

A: The M5KP28AE3 operates from -65°C to 150°C (TJ), while the 5KP28A operates from -55°C to 175°C (TJ). The 5KP28A provides extended high-temperature capability. For applications operating below -55°C, the M5KP28AE3 is required.

Q: Does RoHS compliance affect electrical performance?

A: RoHS compliance status reflects manufacturing process and material composition but does not alter electrical characteristics. Both parts deliver identical voltage regulation and transient suppression performance.

Q: What inventory considerations apply to these substitutes?

A: The M5KP28AE3 maintains 808 pcs in stock (Bulk packaging). The 5KP28A provides significantly higher availability at 14,800 pcs (Cut Tape packaging). For high-volume procurement or extended lead-time mitigation, the 5KP28A offers supply chain advantages.

Q: Are there differences in peak pulse current ratings?

A: The M5KP28AE3 is rated at 110A peak pulse current, while the 5KP28A is rated at 112.3A. Both meet the 5000W power dissipation requirement. The 5KP28A provides marginally higher current capacity within the same power envelope.

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