M5KP43AE3 Equivalent & Substitute Parts

Part Overview

The M5KP43AE3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This component features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 72A peak pulse current capability in a through-hole DO-204AR axial package. The device is classified as active and carries military-grade qualification under MIL-PRF-19500. Substitute parts are identified to address packaging preferences, compliance requirements, or inventory availability while maintaining equivalent electrical performance within specified parameters.

Substiute Parts

M5KP43AE3

Microchip TechnologyIn Stock: 651M5KP43AE3 Datasheet

Current PartRFQ

5KP43A

Littelfuse Inc.In Stock: 34105KP43A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the M5KP43AE3 is determined by equivalence across the following critical electrical parameters: reverse standoff voltage (43V), breakdown voltage minimum (47.8V), clamping voltage maximum (69.4V), peak pulse current (72A minimum), and peak pulse power (5000W). All substitute parts must maintain these specifications within the same tolerance bands to ensure functional interchangeability in the circuit.

The 5KP43A from Littelfuse Inc. qualifies as an equivalent substitute based on matching all core electrical parameters. Both devices are unidirectional zener-type TVS diodes with identical voltage ratings and power dissipation capability. Differences in packaging format (DO-204AR versus P600), supplier device package designation, and RoHS compliance status do not affect electrical equivalence but may influence procurement and assembly considerations.

Parameter Comparison

Engineering Selection Recommendations

Both the M5KP43AE3 and 5KP43A are active products suitable for general-purpose TVS applications. The M5KP43AE3 carries military-grade qualification under MIL-PRF-19500, which may be required for defense or aerospace applications. The 5KP43A offers ROHS3 compliance, which is advantageous for applications subject to environmental or regulatory restrictions on hazardous substances.

The 5KP43A demonstrates a slightly higher peak pulse current rating (73.5A versus 72A) and an extended upper operating temperature limit (175°C versus 150°C), providing marginal performance advantages in high-temperature environments. The operating temperature range of the 5KP43A (-55 to 175°C) is narrower at the lower bound compared to the M5KP43AE3 (-65 to 150°C), which may be a consideration for applications requiring operation below -55°C.

Package designation differences (DO-204AR versus P600) reflect manufacturer-specific axial package nomenclature and do not indicate functional incompatibility. Both are through-hole axial packages suitable for identical PCB footprints.

Frequently Asked Questions (FAQ)

Q: Can the 5KP43A directly replace the M5KP43AE3 in an existing circuit?

A: Yes, the 5KP43A is electrically equivalent to the M5KP43AE3 across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse power. Both are unidirectional zener-type TVS diodes with identical voltage ratings and power dissipation. The through-hole axial package format is compatible with standard PCB footprints designed for either device.

Q: What is the difference between DO-204AR and P600 packages?

A: DO-204AR and P600 are manufacturer-specific designations for axial through-hole packages. Both refer to the same physical form factor and pin configuration. The difference is nomenclature only; the packages are mechanically and electrically interchangeable for PCB assembly purposes.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance status does not affect electrical performance or functional interchangeability. The M5KP43AE3 is RoHS non-compliant, while the 5KP43A is ROHS3 compliant. Selection between these parts depends on regulatory requirements applicable to the end application or market region.

Q: Are there temperature range limitations when substituting?

A: The M5KP43AE3 operates from -65°C to 150°C, while the 5KP43A operates from -55°C to 175°C. For applications requiring operation below -55°C, the M5KP43AE3 is required. For applications requiring operation above 150°C, the 5KP43A is required. Within the overlapping range (-55°C to 150°C), both devices are suitable.

Q: Is military qualification a factor in substitution decisions?

A: Military qualification under MIL-PRF-19500 is specific to the M5KP43AE3. If military-grade certification is a contractual or regulatory requirement, the M5KP43AE3 must be used. The 5KP43A does not carry this qualification and is not a suitable substitute for applications requiring MIL-PRF-19500 compliance.

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

A: The M5KP43AE3 is rated for 72A peak pulse current, while the 5KP43A is rated for 73.5A. Both devices meet the 5000W peak pulse power specification. The 1.5A difference represents a marginal performance variation and does not affect substitution eligibility for applications designed around the 72A specification.

Q: Can packaging format affect PCB assembly compatibility?

A: Both the M5KP43AE3 (DO-204AR) and 5KP43A (P600) are through-hole axial packages with identical lead spacing and footprint requirements. Packaging format does not affect PCB assembly compatibility. The choice between bulk and cut tape packaging affects procurement and automated assembly processes but not component interchangeability.