Microchip Technology MPLAD18KP18AE3

Overview

MPLAD18KP18AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤29.2 V under 617 A peak impulse current, and features a 18 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (20.0–22.1 V). It is RoHS-compliant (e3), AEC-Q101 qualified, and rated for -55°C to +150°C operation.

For engineers reviewing the MPLAD18KP18AE3 datasheet, MPLAD18KP18AE3 pinout, MPLAD18KP18AE3 application, or MPLAD18KP18AE3 equivalent, key selection criteria include its 18 kW lightning surge rating per RTCA DO-160 Section 22, IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source), ESD/EFT compliance per IEC 61000-4-2/4-4, and thermal resistance of 0.7 °C/W junction-to-case.

Technical Context

This TVS diode operates as a clamping device in parallel with protected circuitry, triggering when transient voltage exceeds its breakdown threshold (V(BR)). Its low RθJC (0.7 °C/W) enables effective heat transfer to a heatsink or PCB copper plane, critical for multi-stroke lightning events. The device uses silicon avalanche technology with void-free epoxy encapsulation meeting UL94V-0.

It supports both single-pulse and repetitive surge conditions (duty factor ≤0.05%), with derating applied above 100°C case temperature. Polarity is unidirectional: cathode is the metal base (bottom side), requiring correct PCB layout for proper orientation and thermal conduction.

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Power Leadless Array Device), thermosetting epoxy body with metal base for thermal conduction and mechanical anchoring. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Cathode is the exposed metal bottom surface; anode is the top-side metallization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ18A and SMCJ18A, the MPLAD18KP18AE3 provides 12× and 12× higher peak pulse power respectively, enabling robust protection in mission-critical aerospace and heavy-duty automotive systems where thermal management via metal-base conduction is essential.

Availability

MPLAD18KP18AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and certified surge performance.

Supply support for MPLAD18KP18AE3 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, mixed-signal, and timing solutions for aerospace, defense, and industrial markets.

The MPLAD series was developed to address high-energy transient protection needs in safety-critical platforms, emphasizing low thermal resistance, AEC-Q101 qualification, and compliance with RTCA DO-160 and IEC 61000-4-x standards.

FAQ

What is the clamping voltage of MPLAD18KP18AE3 at its rated peak pulse current?

The MPLAD18KP18AE3 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 617 A under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during surge events. The MPLAD18KP18AE3 achieves this clamping performance while maintaining low leakage and stable breakdown characteristics.

Is MPLAD18KP18AE3 suitable for automotive applications?

Yes, MPLAD18KP18AE3 is AEC-Q101 qualified and explicitly rated for automotive load dump protection per ISO 16750-2. Its 18 kW surge capability, -55°C to +150°C operating range, and robust thermal design make it suitable for engine control units, battery management systems, and ADAS power supplies. The MPLAD18KP18AE3 also meets ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) immunity requirements common in automotive ECUs.

How does the metal base of MPLAD18KP18AE3 function electrically and thermally?

The metal base of MPLAD18KP18AE3 serves as the cathode terminal and primary thermal conduction path. Electrically, it must be connected to the lowest potential reference (e.g., ground or negative rail) in the protected circuit. Thermally, it transfers >90% of surge energy directly to the PCB copper pour or external heatsink, enabled by its ultra-low 0.7 °C/W junction-to-case resistance. This dual-role design is integral to the MPLAD18KP18AE3's ability to survive multi-stroke lightning events.

Does MPLAD18KP18AE3 meet RTCA DO-160 lightning protection requirements?

Yes, MPLAD18KP18AE3 is specifically validated for RTCA DO-160 Section 22 lightning-induced transient protection. It meets Level 4 and Level 5 pin injection requirements for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) at 25°C, and is rated for multi-stroke capability. The MPLAD18KP18AE3's 18 kW rating and low clamping voltage ensure compliance across aircraft subsystems including flight controls and navigation sensors.

What is the meaning of the "E3" suffix in MPLAD18KP18AE3?

"E3" in MPLAD18KP18AE3 denotes RoHS-compliant construction with annealed matte-tin plating on terminals, fully compliant with Directive 2011/65/EU. It replaces lead-based finishes while maintaining solderability per MIL-STD-750 Method 2026 and thermal cycling reliability. The E3 marking confirms that the MPLAD18KP18AE3 contains no restricted substances above allowable thresholds and supports lead-free reflow assembly processes.