Microchip Technology MAPLAD18KP17CAE3

Overview

MAPLAD18KP17CAE3 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 ≤27.6 V under 653 A peak impulse current, and features a 17 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (18.9–20.9 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.

For engineers reviewing the MAPLAD18KP17CAE3 datasheet, MAPLAD18KP17CAE3 pinout, MAPLAD18KP17CAE3 application, or MAPLAD18KP17CAE3 equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), ESD/EFT immunity per IEC 61000-4-2/4-4, and high-reliability avionics power rail protection where thermal resistance (RθJC = 0.7 °C/W) and low-profile mounting are critical.

Technical Context

This TVS diode operates as a bidirectional clamping device with symmetrical avalanche breakdown characteristics. Its metal-base package enables direct thermal coupling to heatsinks, supporting junction-to-case thermal resistance of 0.7 °C/W and steady-state dissipation up to 71 W at TC = 100°C. The device exhibits sub-5 ns response time and clamps transients within 27.6 V at 653 A (10/1000 μs waveform).

It is rated for operation across –55°C to +150°C junction temperature, complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, and supports RoHS-compliant soldering at 260°C for 10 seconds. All units undergo 100% surge testing and 3σ lot norm screening on standby current (ID ≤ 10 μA @ 17 V).

Key Specifications

Pinout & Package

The MAPLAD18KP17CAE3 uses a low-profile, void-free thermosetting epoxy surface-mount package with metal baseplate for thermal conduction. The cathode is the metal base (bottom side); anode terminals are on the top surface. Package dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), with recommended FR4 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 SMBJ17CA and SMCJ17CA, MAPLAD18KP17CAE3 provides 30× and 12× higher peak pulse power respectively, validated thermal performance via metal-base mounting, and formal qualification for aviation and automotive safety-critical systems - making it irreplaceable in high-reliability surge environments.

Availability

MAPLAD18KP17CAE3 is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAPLAD18KP17CAE3 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.

The PLAD family - including MAPLAD18KP17CAE3 - was engineered specifically for high-energy transient suppression in mission-critical power systems where thermal robustness, multi-stroke endurance, and standards compliance (DO-160, AEC-Q101, IEC 61000-4-5) are non-negotiable.

FAQ

What is the clamping voltage of MAPLAD18KP17CAE3 at its rated peak pulse current?

The MAPLAD18KP17CAE3 has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current of 653 A under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and is measured per JEDEC standards. The clamping performance directly enables compliance with IEC 61000-4-5 Class 4 and RTCA DO-160F Waveform 4 requirements.

Is MAPLAD18KP17CAE3 qualified for automotive applications?

Yes, MAPLAD18KP17CAE3 is fully qualified to AEC-Q101 for automotive use. It undergoes stress testing including high-temperature operating life, temperature cycling, and surge validation per automotive load dump profiles. Its 17 V VWM and 27.6 V clamping make it suitable for 12 V battery rail protection in engine control units, ADAS domain controllers, and body electronics modules.

Does MAPLAD18KP17CAE3 require a heatsink for reliable operation?

While MAPLAD18KP17CAE3 can survive single 18 kW surges without external heatsinking, sustained or repetitive surge events demand thermal management. Its 0.7 °C/W RθJC rating assumes direct metal-base contact with a heatsink. For automotive load dump or multi-stroke lightning scenarios, a copper pour or dedicated heatsink is required to maintain junction temperature below 150°C and ensure long-term reliability.

How does the CA suffix in MAPLAD18KP17CAE3 indicate device functionality?

The "CA" suffix in MAPLAD18KP17CAE3 explicitly denotes bidirectional construction - meaning the device provides symmetrical clamping for both positive and negative transients. This differs from "A"-suffixed unidirectional variants, which clamp only in reverse bias. The bidirectional design eliminates polarity concerns in AC-coupled or floating-ground systems such as avionics data buses and railway signaling interfaces.

What packaging options are available for MAPLAD18KP17CAE3?

MAPLAD18KP17CAE3 is supplied in bulk or tape-and-reel format. Tape-and-reel packaging follows EIA-481-B standard and requires adding the "TR" suffix (e.g., MAPLAD18KP17CAE3TR) when ordering. The device weighs approximately 1 gram and features RoHS-compliant matte-tin plating compatible with leaded and lead-free reflow processes up to 260°C for 10 seconds.