Microchip Technology MAPLAD18KP54CA

Overview

MAPLAD18KP54CA 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 at ≤87.1 V under 100 A peak impulse current, and features a 54 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (60.0–66.3 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.

For engineers reviewing the MAPLAD18KP54CA datasheet, MAPLAD18KP54CA pinout, MAPLAD18KP54CA application, or MAPLAD18KP54CA equivalent, this device is selected for high-reliability DC bus protection in avionics power distribution units, engine control modules, and flight-critical sensor interfaces where multi-stroke lightning immunity and low thermal resistance are mandatory.

Technical Context

The MAPLAD18KP54CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and low junction-to-case thermal resistance (0.7 °C/W), enabling effective dissipation of repeated 10/1000 μs transients without thermal runaway. Its bidirectional construction supports symmetrical overvoltage suppression on AC-coupled or floating signal/power lines.

It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) using 2 Ω, 12 Ω, and 42 Ω source impedances - validated across Classes 1–5 per test configuration. Pin injection protection per RTCA/DO-160F Waveform 4 (6.4/69 μs) is certified to Level 4 at 25 °C.

Key Specifications

Pinout & Package

MAPLAD18KP54CA uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode and cathode, with polarity marked by the metal base (cathode) on the bottom surface per manufacturer documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ54CA and SMCJ54CA, MAPLAD18KP54CA provides 30× higher peak pulse power and 21× lower junction-to-case thermal resistance - enabling certified multi-stroke lightning protection in safety-critical platforms where thermal accumulation and waveform fidelity are design-critical.

Availability

MAPLAD18KP54CA is available at Aetrix Electronics and suitable for aircraft power distribution units, automotive engine control modules, and avionics sensor interface cards requiring stable component supply across extended production lifecycles.

Supply support for MAPLAD18KP54CA 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 MAPLAD18KP54CA belongs to Microsemi's PLAD high-power TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical transportation systems where AEC-Q101 and RTCA DO-160 compliance are mandatory.

FAQ

What is the clamping voltage of MAPLAD18KP54CA at its rated peak pulse current?

The MAPLAD18KP54CA has a maximum clamping voltage (VC) of 87.1 V at 100 A peak pulse current under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01215 Rev B datasheet and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The clamping performance remains stable across temperature due to low αV(BR) and robust thermal design.

Is MAPLAD18KP54CA qualified for automotive applications?

Yes, MAPLAD18KP54CA is fully qualified to AEC-Q101 for automotive use. It undergoes stress testing including temperature cycling, mechanical shock, and humidity exposure per the standard. Its 54 V VWM and bidirectional architecture make it suitable for protecting 12 V and 24 V power rails in engine control units, ADAS domain controllers, and body electronics exposed to load dump and jump-start transients.

Does MAPLAD18KP54CA meet RTCA DO-160F lightning protection requirements?

Yes, MAPLAD18KP54CA is certified for RTCA DO-160F Section 22 lightning-induced transient susceptibility. Specifically, it meets Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 36 V variants - with MAPLAD18KP54CA explicitly listed for Waveform 4 Level 4 in the RF01215 datasheet. Its 18 kW rating and low clamping ensure compliance across multi-stroke test sequences.

What is the thermal resistance and how does it affect MAPLAD18KP54CA's surge capability?

MAPLAD18KP54CA has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. This ultra-low value allows rapid heat transfer from the silicon die to the PCB copper pour or external heatsink. As a result, the device sustains ≥1000 10/1000 μs surges at 0.05% duty factor without thermal derating - a key requirement for DO-160 multi-stroke validation that lower-RθJC alternatives cannot achieve.

Can MAPLAD18KP54CA be used in bidirectional signal line protection?

Yes, MAPLAD18KP54CA is a bidirectional TVS (denoted by "CA" suffix) and is expressly designed for symmetric surge suppression on AC-coupled, differential, or floating signal lines. Its matched positive/negative clamping characteristics protect both polarities equally, making it ideal for RS-485, CAN FD, and MIL-STD-1553 bus interfaces where polarity reversal or common-mode transients occur.