Microchip Technology MPLAD18KP64CAE3

Overview

MPLAD18KP64CAE3 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 64 V reverse standoff voltage (VWM), clamps to ≤103 V at 175 A peak impulse current (IPP), and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–4 lightning standards.

For engineers reviewing the MPLAD18KP64CAE3 datasheet, MPLAD18KP64CAE3 pinout, MPLAD18KP64CAE3 application, or MPLAD18KP64CAE3 equivalent, key selection criteria include bidirectional clamping capability, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 termination, and verified compliance with multi-stroke lightning (DO-160 Section 22) and ESD/EFT immunity per IEC 61000-4-2/4-4.

Technical Context

This TVS diode operates as a voltage-clamped crowbar device triggered by avalanche breakdown above its specified V(BR) range of 71.1–78.6 V. Its bidirectional construction enables symmetrical clamping for AC-coupled or floating signal lines without polarity sensitivity.

Thermal design relies on direct metal-base heat sinking-cathode is the metal base under the body-and achieves RθJC = 0.7 °C/W, enabling high-repetition-rate surge handling when mounted per recommended pad layout on FR4. It supports steady-state dissipation up to 71 W at TC = 100°C with derating above that temperature.

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal; void-free UL94V-0 epoxy body; 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 SMBJ64CA and SMCJ64CA, the MPLAD18KP64CAE3 provides 30× higher peak pulse power, 14× lower thermal resistance, and formal qualification for RTCA DO-160F Level 4 - making it uniquely suitable for aerospace-grade, high-repetition-rate surge environments.

Availability

MPLAD18KP64CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain electronics, and industrial motor drive systems requiring stable component supply, long-term lifecycle support, and certified surge immunity.

Supply support for MPLAD18KP64CAE3 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 ruggedized discrete components.

The MPLAD18KP64CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for mission-critical surge protection where multi-stroke lightning resilience, thermal robustness, and AEC-Q101 or DO-160 qualification are mandatory.

FAQ

What is the clamping voltage of MPLAD18KP64CAE3 at its rated peak pulse current?

The MPLAD18KP64CAE3 has a maximum clamping voltage (VC) of 103 V when subjected to its rated peak impulse current (IPP) of 175 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream circuitry remains within safe voltage limits during surge events. The MPLAD18KP64CAE3 maintains this clamping performance across its full operating temperature range.

Is MPLAD18KP64CAE3 suitable for automotive underhood applications?

Yes, the MPLAD18KP64CAE3 is AEC-Q101 qualified and rated for junction temperatures from –55 °C to +150 °C, making it suitable for underhood automotive applications including alternator load dump protection and battery line surge suppression. Its bidirectional construction and 18 kW pulse rating exceed standard ISO 7637-2 and SAE J1113-11 requirements. The MPLAD18KP64CAE3 also supports high-temperature derating per Figure 6 in the datasheet.

Does MPLAD18KP64CAE3 require a heatsink for standard operation?

No external heatsink is required for single-event surge suppression, but the metal base (cathode) must be soldered to a minimum 10 cm² copper area on the PCB to achieve the specified RθJC of 0.7 °C/W. For repetitive surges (>0.05% duty cycle), additional thermal management such as internal layer copper pours or chassis attachment is recommended. The MPLAD18KP64CAE3 thermal performance is validated only with the pad layout shown in RF01215 Rev B.

What does the "CA" suffix indicate in MPLAD18KP64CAE3?

The "CA" suffix in MPLAD18KP64CAE3 denotes bidirectional construction - meaning the device provides symmetrical clamping for both positive and negative transients without polarity dependence. This distinguishes it from unidirectional variants (e.g., MPLAD18KP64AE3), which clamp only in reverse bias. The MPLAD18KP64CAE3 is therefore ideal for protecting AC-coupled buses, differential signaling lines, and floating power domains.

How does MPLAD18KP64CAE3 comply with RTCA DO-160F lightning testing?

The MPLAD18KP64CAE3 is validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 protection when mounted per recommended pad layout. Its 18 kW rating and low clamping voltage ensure compliance with multi-stroke lightning requirements for aircraft avionics. The MPLAD18KP64CAE3 achieves this through optimized silicon geometry and metal-base thermal design, not external components.