MP4KE43AE3 Equivalent & Substitute Parts

Part Overview

The MP4KE43AE3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This through-hole component operates across a wide temperature range (-65°C to 150°C) and is qualified to MIL-PRF-19500 military standards. The device is currently in active production status with 676 units available in bulk packaging.

Identifying equivalent and substitute parts is necessary when bulk packaging is unavailable, when alternative compliance certifications are required, or when extended operating temperature ranges are needed for specific application requirements.

Substiute Parts

MP4KE43AE3

Microchip TechnologyIn Stock: 688MP4KE43AE3 Datasheet

Current PartRFQ

P4KE43A

Taiwan Semiconductor CorporationIn Stock: 1026P4KE43A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MP4KE43AE3 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 36.8V
• Voltage - Breakdown (Min): 40.9V
• Voltage - Clamping (Max) @ Ipp: 59.3V
• Current - Peak Pulse (10/1000µs): 7A
• Power - Peak Pulse: 400W

Mechanical Equivalence Criteria:

• Package / Case: DO-204AL (DO-41) Axial
• Mounting Type: Through Hole
• Unidirectional Channels: 1
• Type: Zener

The P4KE43A manufactured by Taiwan Semiconductor Corporation meets all electrical and mechanical equivalence criteria. This substitute maintains identical voltage ratings, peak pulse current, and peak pulse power specifications. Both devices share the same base product number (P4KE43) and are housed in identical DO-204AL through-hole packages.

Parameter Comparison

Engineering Selection Recommendations

MP4KE43AE3 (Microchip Technology) is the primary selection when:

• Military qualification per MIL-PRF-19500 is a contractual or design requirement
• RoHS non-compliance is acceptable for the application
• Bulk packaging format is preferred for inventory management
• Operating temperature range of -65°C to 150°C is sufficient

P4KE43A (Taiwan Semiconductor Corporation) is the appropriate substitute when:

• ROHS3 compliance is required by design specifications or customer requirements
• Extended operating temperature range (-55°C to 175°C) provides margin for high-temperature applications
• Tape & Reel packaging format is compatible with automated assembly processes
• Military qualification is not a contractual requirement
• 994 units in stock provide greater availability than the 676 units of the primary part

Both parts are active products with identical electrical performance and mechanical compatibility. Selection between them depends on compliance certifications, packaging requirements, and temperature operating envelope specifications.

Frequently Asked Questions (FAQ)

Q: Can P4KE43A be used as a direct replacement for MP4KE43AE3 in existing designs?

A: Yes, the P4KE43A is electrically and mechanically equivalent. Both devices share identical voltage ratings (36.8V standoff, 59.3V clamping), peak pulse current (7A), and power dissipation (400W). The through-hole DO-204AL package is identical, enabling direct PCB substitution. Compliance certifications differ; verify that ROHS3 compliance and the absence of MIL-PRF-19500 qualification are acceptable for your application.

Q: What is the difference between bulk and Tape & Reel packaging?

A: Bulk packaging (MP4KE43AE3) supplies components loose in containers, suitable for manual assembly or small-volume production. Tape & Reel packaging (P4KE43A) presents components on continuous carrier tape within reels, optimized for automated pick-and-place assembly equipment. Both formats contain the same component; packaging selection depends on assembly process requirements.

Q: Does the extended operating temperature range of P4KE43A affect circuit performance?

A: The P4KE43A operating range (-55°C to 175°C) encompasses the MP4KE43AE3 range (-65°C to 150°C). The extended upper temperature limit provides additional thermal margin but does not alter electrical performance within the overlapping temperature window. Applications operating below -55°C require the MP4KE43AE3.

Q: Is MIL-PRF-19500 qualification required for my application?

A: MIL-PRF-19500 qualification is mandatory only when specified in design requirements, procurement specifications, or military/aerospace contracts. For commercial and industrial applications without such requirements, the P4KE43A provides equivalent electrical performance with improved RoHS compliance.

Q: Are there any circuit design considerations when substituting between these parts?

A: No circuit design modifications are required. Both parts are pin-compatible, electrically identical across all specified parameters, and housed in the same package. Substitution is transparent to circuit operation.

Q: What inventory considerations apply to these parts?

A: The P4KE43A has 994 units in stock compared to 676 units for the MP4KE43AE3, providing greater availability. If immediate delivery is critical, the P4KE43A may offer shorter lead times. Verify current inventory status with your supplier for time-sensitive applications.