Microchip Technology MPLAD18KP58CA

Overview

MPLAD18KP58CA 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 58 V reverse standoff voltage (VWM), clamps to ≤93.6 V at 207 A peak impulse current (IPP), and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–4 secondary lightning protection with 42 Ω source impedance.

For engineers reviewing the MPLAD18KP58CA datasheet, MPLAD18KP58CA pinout, MPLAD18KP58CA application, or MPLAD18KP58CA equivalent, this device is selected for high-reliability DC bus and signal line protection where multi-stroke lightning immunity, low thermal resistance (RθJC = 0.7 °C/W), and RoHS-compliant SMT packaging are critical design requirements.

Technical Context

This TVS diode uses an avalanche breakdown structure optimized for fast response (<5 ns clamping time) and stable breakdown voltage (64.4–71.2 V at I(BR)), enabling precise overvoltage clamping on bidirectional AC or differential signal lines. Its metal-base package provides direct thermal path to PCB copper, supporting sustained energy dissipation under repetitive surges at ≤0.05% duty factor.

The device complies with AEC-Q101 stress testing and supports MIL-PRF-19500 upscreening options. It achieves IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (4 kV), and RTCA DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) immunity - validated across its full operating temperature range (−55 °C to +150 °C).

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Leaded Anode/Cathode) with metal baseplate for thermal conduction. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Cathode terminal is the exposed metal base (bottom side); anode is top-side metallization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ58CA and SMCJ58CA, the MPLAD18KP58CA delivers 30× higher peak power handling, 3.5× lower thermal resistance, and certified compliance with aviation lightning standards - making it irreplaceable in safety-critical, high-energy surge environments where reliability under repeated stress is non-negotiable.

Availability

MPLAD18KP58CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive ADAS power systems, and industrial railway signaling requiring stable component supply with full traceability and long-lifecycle support.

Supply support for MPLAD18KP58CA 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 MPLAD18KP58CA belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection in mission-critical platforms where thermal performance, qualification rigor, and surge repetition endurance are paramount.

FAQ

What is the clamping voltage of MPLAD18KP58CA at its rated peak impulse current?

The MPLAD18KP58CA exhibits a maximum clamping voltage (VC) of 93.6 V when subjected to its rated peak impulse current of 207 A under 10/1000 μs waveform conditions. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuits during worst-case surge events, ensuring downstream components remain within safe operating margins.

Does MPLAD18KP58CA require a heatsink for standard operation?

The MPLAD18KP58CA does not require an external heatsink for single-event surge suppression, but its 0.7 °C/W junction-to-case thermal resistance mandates direct soldering of the metal baseplate to a minimum 250 mm² copper pour (per Microsemi's recommended pad layout) to manage cumulative heating during repetitive surges. Without adequate PCB copper, thermal derating reduces peak pulse power capability significantly.

Is MPLAD18KP58CA qualified for automotive applications per AEC-Q101?

Yes, the MPLAD18KP58CA is tested and qualified in accordance with AEC-Q101 requirements for discrete semiconductors. This includes stress tests for high-temperature operating life, temperature cycling, and surge robustness - confirming suitability for under-hood and chassis-mounted automotive electronics subject to harsh thermal and electrical environments.

How does the bidirectional construction of MPLAD18KP58CA affect its circuit placement?

The bidirectional construction of MPLAD18KP58CA allows placement across any two nodes requiring symmetrical overvoltage protection - such as AC mains inputs, RS-485 differential pairs, or isolated DC-DC feedback paths - without regard to polarity. Its cathode is the metal baseplate (PCB side), and anode is the top metallization, enabling straightforward orientation-independent layout in high-density designs.

Can MPLAD18KP58CA be used for IEC 61000-4-5 Class 5 lightning protection?

No, the MPLAD18KP58CA is rated for IEC 61000-4-5 Class 1–4 secondary lightning protection with 42 Ω and 12 Ω source impedances, but not Class 5. Per the datasheet, Class 5 compliance is limited to MPLAD18KP7.0A–130CA variants. Using MPLAD18KP58CA for Class 5 would exceed its validated clamping and energy-handling envelope, risking premature failure.