Microchip Technology MPLAD18KP180AE3

Overview

MPLAD18KP180AE3 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, features a 180 V reverse standoff voltage (VWM), clamps to ≤291 V at 500 A, and exhibits <100 ps response time. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22 and secondary lightning suppression per IEC 61000-4-5.

For engineers reviewing the MPLAD18KP180AE3 datasheet, MPLAD18KP180AE3 pinout, MPLAD18KP180AE3 application, or MPLAD18KP180AE3 equivalent, key selection criteria include its 180 V VWM rating, 291 V max clamping voltage at 500 A, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and qualification to AEC-Q101 and MIL-PRF-19500 screening levels.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode on the metal base (package bottom), enabling low-inductance mounting directly to heatsinks. Its silicon avalanche structure supports multi-stroke surge endurance under RTCA DO-160 Waveform 4 (Level 4) and Waveform 5A (Level 4 up to 36 V variants), with validated performance at 25 °C ambient and controlled case temperature.

Thermal management is integral: RθJC = 0.7 °C/W enables efficient heat transfer to external heatsinks, while RθJA = 50 °C/W (on FR4 with recommended pad layout) defines ambient-limited derating. Steady-state dissipation is rated at 2.5 W at TA = 25 °C and 71 W at TC = 100 °C, confirming its suitability for hybrid transient + DC-bias applications.

Key Specifications

Pinout & Package

The MPLAD18KP180AE3 uses a surface-mount plastic package with void-free UL94V-0 epoxy body and tin-plated terminals (RoHS-compliant e3 finish). The cathode is the metal base (bottom side); anode is the top-side metallization. Mounting requires thermal pad layout per RF01215 Rev B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ180A and 1.5KE180A, the MPLAD18KP180AE3 provides 30× higher peak power, 0.7 °C/W thermal resistance for heatsink integration, and qualification to AEC-Q101 and DO-160 - making it the sole choice for mission-critical aviation, automotive, and industrial surge protection where multi-stroke endurance and thermal robustness are mandatory.

Availability

MPLAD18KP180AE3 is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU power inputs, and industrial PLC DC bus protection requiring stable component supply across extended production lifecycles.

Supply support for MPLAD18KP180AE3 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 power solutions for aerospace, defense, and industrial markets.

The MPLAD18KP180AE3 belongs to Microsemi's PLAD high-power TVS family, engineered specifically for multi-stroke lightning and load dump protection in safety-critical systems where thermal stability, surge endurance, and qualification to RTCA DO-160 and AEC-Q101 are non-negotiable.

FAQ

What is the clamping voltage of MPLAD18KP180AE3 at 500 A?

The MPLAD18KP180AE3 has a maximum clamping voltage (VC) of 291 V when subjected to a 500 A peak impulse current under 10/1000 μs waveform conditions. This value is specified in the Electrical Characteristics table of RF01215 Rev B and ensures downstream circuitry remains below critical voltage thresholds during surge events. The clamping performance is guaranteed across the full operating temperature range and is validated per IEC 61000-4-5 test protocols.

Is MPLAD18KP180AE3 RoHS compliant?

Yes, MPLAD18KP180AE3 is RoHS compliant, indicated by the "e3" suffix in its part number. It features annealed matte-tin plating per J-STD-020B Level 1 moisture sensitivity, requires no dry pack, and meets lead-free soldering requirements up to 260 °C for 10 seconds. The e3 designation confirms full compliance with EU Directive 2011/65/EU and associated amendments, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE.

Does MPLAD18KP180AE3 support bidirectional surge protection?

No, MPLAD18KP180AE3 is a unidirectional TVS diode. Its polarity is designated by the "A" suffix (versus "CA" for bidirectional variants). The cathode is located on the metal base, and it conducts only during reverse-biased overvoltage events. For bidirectional protection at 180 V standoff, the correct variant is MPLAD18KP180CA - which shares identical power rating, package, and thermal specs but clamps symmetrically for AC or floating-line applications.

What thermal interface is required for MPLAD18KP180AE3 to achieve rated 18 kW performance?

To sustain full 18,000 W peak pulse power, MPLAD18KP180AE3 must be mounted with its metal cathode base onto a thermally conductive surface - such as a copper heatsink or large PCB copper pour - using solder or thermally enhanced adhesive. The 0.7 °C/W junction-to-case resistance assumes direct metal-to-metal contact; thermal interface materials with <0.1 °C·in²/W resistance are recommended. Pad layout must follow RF01215 Rev B specifications to ensure mechanical stability and thermal uniformity.

Which industry standards does MPLAD18KP180AE3 meet for lightning protection?

MPLAD18KP180AE3 is validated for secondary lightning protection per IEC 61000-4-5 (Classes 1–5 with 42 Ω source, Classes 1–4 with 12 Ω, and Class 2–3 with 2 Ω), and for pin-injection lightning immunity per RTCA DO-160F Section 22 Waveform 4 (Level 4) and Waveform 5A (Level 4 up to 36 V variants). Its 18 kW rating and multi-stroke endurance make it suitable for primary lightning protection zones in aircraft power distribution systems.