Microchip Technology MAPLAD18KP54CAE3

Overview

MAPLAD18KP54CAE3 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps transients to ≤87.1 V at 100 A, and features a 54 V reverse standoff voltage (VWM), 60–66.3 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.

For engineers reviewing the MAPLAD18KP54CAE3 datasheet, MAPLAD18KP54CAE3 pinout, MAPLAD18KP54CAE3 application, or MAPLAD18KP54CAE3 equivalent, key selection criteria include bidirectional clamping capability, 18 kW surge rating under IEC 61000-4-5 (42 Ω source), DO-160F compliance for aircraft avionics, and RoHS-compliant e3 termination plating.

Technical Context

This TVS diode employs an avalanche breakdown mechanism to provide fast-response overvoltage protection. Its metal-base package enables low thermal resistance (RθJC = 0.7 °C/W), supporting high-repetition-rate surges when mounted on FR4 with recommended pad layout. The device operates across –55 °C to +150 °C junction temperature range and maintains stable clamping performance under multi-stroke lightning conditions per RTCA DO-160 Section 22.

It is rated for secondary lightning protection per IEC 61000-4-5 at 42 Ω, 12 Ω, and 2 Ω source impedances (Class 1–5 depending on impedance), and provides ESD immunity per IEC 61000-4-2 (±30 kV contact) and EFT per IEC 61000-4-4 (40 A). Standby current ID is ≤10 μA at VWM = 54 V.

Key Specifications

Pinout & Package

The MAPLAD18KP54CAE3 uses a surface-mount plastic package with metal base (cathode side), void-free UL94V-0 epoxy body, and matte-tin (e3) RoHS-compliant terminations. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ54CA and SMCJ54CA, MAPLAD18KP54CAE3 delivers 30× higher peak pulse power, 3.5× lower junction-to-case thermal resistance, and formal DO-160F Level 4 validation-making it uniquely suited for aerospace and high-end automotive safety-critical surge protection where single-event energy absorption and thermal survivability are paramount.

Availability

MAPLAD18KP54CAE3 is available at Aetrix Electronics and suitable for avionics power input protection, automotive DC bus surge suppression, and industrial motor drive DC link protection requiring stable component supply and long-term lifecycle support.

Supply support for MAPLAD18KP54CAE3 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 RF solutions for aerospace, defense, and industrial markets.

The MPLAD18KP family was engineered specifically for high-energy transient suppression in mission-critical platforms-emphasizing thermal robustness, multi-stroke endurance, and compliance with RTCA DO-160, AEC-Q101, and IEC 61000-4-5 standards.

FAQ

What is the clamping voltage of MAPLAD18KP54CAE3 at its rated peak pulse current?

The MAPLAD18KP54CAE3 exhibits a maximum clamping voltage (VC) of 87.1 V at a peak impulse current (IPP) of 100 A under 10/1000 μs waveform conditions. This value is measured per standard test methods defined in the RF01215 datasheet and ensures downstream circuitry remains within safe voltage margins during high-energy transients. The clamping performance is guaranteed across the full operating temperature range.

Is MAPLAD18KP54CAE3 certified for use in aircraft avionics systems?

Yes, MAPLAD18KP54CAE3 is validated for RTCA DO-160F Level 4 pin injection protection using Waveform 4 (6.4/69 μs) and meets multi-stroke lightning requirements per Section 22. It is also qualified to AEC-Q101 and supports secondary lightning protection per IEC 61000-4-5. These certifications make MAPLAD18KP54CAE3 suitable for flight-critical power and signal interfaces in commercial and military aircraft.

Does MAPLAD18KP54CAE3 require moisture sensitivity handling per J-STD-020?

No, MAPLAD18KP54CAE3 is rated Moisture Sensitivity Level 1 (MSL-1) per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and does not require dry-pack packaging or baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related assembly risks in high-volume production environments.

What is the thermal resistance from junction to case for MAPLAD18KP54CAE3?

The junction-to-case thermal resistance (RθJC) of MAPLAD18KP54CAE3 is 0.7 °C/W, measured under specified mounting conditions on FR4 with recommended pad layout. This ultra-low value enables efficient heat transfer from the silicon die to the metal base and into the PCB or heatsink, supporting reliable operation under high-duty-cycle surge conditions without thermal derating penalties.

How does the bidirectional construction of MAPLAD18KP54CAE3 affect its circuit placement?

The bidirectional construction of MAPLAD18KP54CAE3 allows symmetrical placement across any two-node interface-no polarity orientation is required during PCB layout. Its cathode is the metal base (bottom side), and the top surface serves as the anode terminal for both polarities. This simplifies design in AC-coupled or floating systems and eliminates risk of reverse installation in high-density layouts.