Microchip Technology MPLAD18KP20AE3

Overview

MPLAD18KP20AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 20 V reverse standoff voltage (VWM), clamps to ≤32.4 V at 556 A peak current, and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load-dump protection circuits.

For engineers reviewing the MPLAD18KP20AE3 datasheet, MPLAD18KP20AE3 pinout, MPLAD18KP20AE3 application, or MPLAD18KP20AE3 equivalent, key selection criteria include its DO-160F Waveform 4 & 5A compliance up to Level 5, IEC 61000-4-5 secondary lightning protection across multiple source impedances, RoHS-compliant e3 plating, and validated performance under AEC-Q101 stress testing.

Technical Context

This TVS diode operates as a clamping device in parallel with protected circuitry, triggering at breakdown voltage (V(BR) = 22.2–24.5 V) to divert surge energy away from sensitive components. Its low RθJC (0.7 °C/W) enables effective thermal coupling to PCB copper or heatsinks, critical for multi-stroke lightning events per RTCA DO-160 Section 22.

The device supports both unidirectional (A-suffix) and bidirectional (CA-suffix) configurations; MPLAD18KP20AE3 is unidirectional with cathode on the metal base. It meets IEC 61000-4-2 ESD (±15 kV air/±8 kV contact), IEC 61000-4-4 EFT (40 A), and IEC 61000-4-5 surge immunity up to Class 5 with 42 Ω source impedance.

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal. Void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.33 mm), tin-lead or RoHS-compliant matte-tin plating, polarity marked by cathode on bottom metal surface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ20A and SMCJ20A, MPLAD18KP20AE3 provides 30× higher peak pulse power, certified aerospace-grade reliability, and thermal performance enabling sustained operation in high-repetition surge environments - making it irreplaceable for DO-160F and AEC-Q101-compliant systems.

Availability

MPLAD18KP20AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive battery management, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and certified surge protection performance.

Supply support for MPLAD18KP20AE3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.

The MPLAD series was engineered specifically for high-energy transient suppression in mission-critical platforms, emphasizing thermal robustness, multi-stroke survivability, and regulatory compliance across aviation and automotive standards.

FAQ

What is the clamping voltage of MPLAD18KP20AE3 at its rated peak pulse current?

The MPLAD18KP20AE3 has a maximum clamping voltage (VC) of 32.4 V at 556 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value ensures downstream ICs and sensors remain within safe operating voltage limits during severe transients such as automotive load dump or aircraft lightning induction. The clamping behavior is guaranteed across the full operating temperature range of −55 °C to +150 °C.

Does MPLAD18KP20AE3 meet AEC-Q101 qualification requirements?

Yes, MPLAD18KP20AE3 is tested and qualified to AEC-Q101 standards for discrete semiconductors. This includes stress tests for humidity, temperature cycling, mechanical shock, and surge current endurance - confirming suitability for automotive under-hood and powertrain applications. The qualification applies specifically to the MPLAD18KP20AE3 variant, not the entire MPLAD family generically.

How does the PLAD package of MPLAD18KP20AE3 improve thermal performance compared to standard SMC packages?

The PLAD package of MPLAD18KP20AE3 achieves a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W - over 3× better than typical SMC packages (~2.5 °C/W). This is accomplished via direct metal base contact to PCB copper or heatsinks, minimizing thermal bottlenecks during repetitive surge events. The result is lower steady-state junction temperature and extended device lifetime in high-duty-cycle applications like motor drives.

Can MPLAD18KP20AE3 be used for bidirectional surge protection?

No, MPLAD18KP20AE3 is a unidirectional TVS diode, indicated by the "A" suffix (not "CA"). Its cathode is on the metal base, and it conducts only during reverse-biased overvoltage events. For bidirectional protection, the correct variant is MPLAD18KP20CA, which uses symmetrical construction and clamps in both polarities - essential for AC-coupled or floating signal lines.

What DO-160F lightning test levels does MPLAD18KP20AE3 support?

MPLAD18KP20AE3 supports DO-160F Section 22 Waveform 4 (6.4/69 μs) up to Level 5 and Waveform 5A (40/120 μs) up to Level 4. These ratings are explicitly confirmed in the RF01215 datasheet for the MPLAD18KP20A variant. Performance is validated at 25 °C with appropriate PCB pad layout and thermal management per Microsemi's recommended footprint.