Microchip Technology MPLAD18KP18CAE3

Overview

MPLAD18KP18CAE3 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 18 V reverse standoff voltage (VWM), clamps to ≤29.2 V at 617 A peak impulse current (IPP), and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning standards.

For engineers reviewing the MPLAD18KP18CAE3 datasheet, MPLAD18KP18CAE3 pinout, MPLAD18KP18CAE3 application, or MPLAD18KP18CAE3 equivalent, key selection criteria include its bidirectional polarity, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, 1 g mass, and compatibility with FR4 PCBs using the specified pad layout per RF01215 Rev B.

Technical Context

This TVS diode operates as a clamping device in parallel with sensitive circuitry, activating when transient voltage exceeds its breakdown threshold (V(BR) = 20.0–22.1 V). Its low RθJC (0.7 °C/W) enables efficient heat transfer to the PCB copper plane or heatsink, critical for multi-stroke lightning compliance under RTCA DO-160 Section 22.

The bidirectional construction (indicated by "CA") allows symmetric suppression of positive and negative transients without polarity sensitivity. It supports IEC 61000-4-2 ESD (±30 kV air/±30 kV contact), IEC 61000-4-4 EFT (4 kV), and IEC 61000-4-5 surge testing with 2 Ω, 12 Ω, and 42 Ω source impedances across multiple protection classes.

Key Specifications

Pinout & Package

The MPLAD18KP18CAE3 uses a 2-terminal surface-mount PLAD package with a metal base acting as the common cathode terminal for both polarities. The plastic body is marked with the full part number; polarity is defined by the metal base (cathode), while the top-side metallization serves as the anode connection point.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ18CA and V26MLA1805, the MPLAD18KP18CAE3 offers 30× higher peak pulse power, certified multi-stroke lightning resilience, and a thermally optimized metal-base package-making it uniquely suitable for mission-critical avionics and industrial power electronics where single-event failure is unacceptable.

Availability

MPLAD18KP18CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU power conditioning, and industrial motor drive protection requiring stable component supply, long-term lifecycle assurance, and traceable high-reliability sourcing.

Supply support for MPLAD18KP18CAE3 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) designs high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.

The MPLAD18KP18CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection in safety-critical platforms where thermal robustness, DO-160F compliance, and long-term parametric stability are mandatory.

FAQ

What is the clamping voltage of the MPLAD18KP18CAE3 at its rated peak pulse current?

The MPLAD18KP18CAE3 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak impulse current (IPP) of 617 A under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and ensures downstream circuitry remains within safe voltage margins during surge events. The MPLAD18KP18CAE3 achieves this performance via low dynamic impedance and optimized silicon geometry.

Does the MPLAD18KP18CAE3 meet RTCA DO-160F lightning protection requirements?

Yes, the MPLAD18KP18CAE3 is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning and Waveform 4 (6.4/69 μs) pin injection at Level 4. Documentation RF01215 Rev B confirms compliance for VWM = 18 V variants including MPLAD18KP18CAE3. Its 18 kW PPP rating and thermal design enable repeated surge handling without degradation - a requirement for aircraft-level certification.

How is thermal management implemented in the MPLAD18KP18CAE3 package?

The MPLAD18KP18CAE3 uses a metal-base PLAD package where the entire bottom surface serves as the cathode and primary thermal conduction path. With a specified RθJC of 0.7 °C/W, it requires mounting on a minimum 1 in² copper area per RF01215 Rev B pad layout. This design transfers heat directly from the junction to the PCB plane, enabling stable operation under repetitive 10/1000 μs surges without external heatsinks.

What does the "CA" suffix indicate in MPLAD18KP18CAE3?

The "CA" suffix in MPLAD18KP18CAE3 denotes bidirectional construction, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., MPLAD18KP18AE3), the CA version has no polarity orientation requirement on the PCB and is used where AC-coupled signals, differential buses, or undefined voltage polarity exist - such as in telecom power feeds or avionics data lines.

Is the MPLAD18KP18CAE3 compliant with RoHS and halogen-free standards?

Yes, the MPLAD18KP18CAE3 carries the "e3" suffix, indicating RoHS-compliant annealed matte-tin plating per JEDEC J-STD-609. It meets EU RoHS Directive 2011/65/EU and is halogen-free per IPC-4101D. The void-free UL94V-0 epoxy body and tin-lead-free terminations ensure compatibility with lead-free reflow profiles up to 260°C for 10 seconds, as verified in RF01215 Rev B.