Microchip Technology MAPLAD18KP8.0A

Overview

MPLAD18KP8.0A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤13.6 V under 1324 A peak impulse current, and features a 7.5 V reverse standoff voltage (VWM) with 8.89–9.83 V breakdown voltage (V(BR)). 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 MPLAD18KP8.0A datasheet, MPLAD18KP8.0A pinout, MPLAD18KP8.0A application, or MPLAD18KP8.0A equivalent, key selection criteria include its 7.5 V VWM for 5–6 V rail protection, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and validated performance under multi-stroke lightning stress per DO-160 Section 22.

Technical Context

The MPLAD18KP8.0A employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under repetitive surges at ≤0.05% duty factor when mounted on FR4 with recommended pad layout.

It operates across –55 °C to +150 °C junction temperature range and complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) standards using 2 Ω, 12 Ω, and 42 Ω source impedances - with verified clamping performance up to 13.6 V at 1324 A IPP.

Key Specifications

Pinout & Package

The MPLAD18KP8.0A uses a 2-terminal PLAD package with cathode connected to the exposed metal base (bottom side) and anode accessible via top-side metallization. The metal base serves as both thermal path and electrical terminal, requiring PCB copper pour for thermal management and grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.0A and SMCJ7.0A, the MPLAD18KP8.0A provides 30× and 12× higher peak pulse power respectively, enabling single-device compliance with RTCA DO-160F Level 4 and ISO 7637-2 Pulse 5 - eliminating cascaded TVS designs and reducing BOM count in safety-critical platforms.

Availability

MPLAD18KP8.0A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive inputs requiring stable component supply across extended product lifecycles.

Supply support for MPLAD18KP8.0A 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 MPLAD18KP8.0A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for certified lightning and load-dump protection in mission-critical systems where failure is not an option.

FAQ

What is the clamping voltage of the MPLAD18KP8.0A at its rated peak pulse current?

The MPLAD18KP8.0A has a maximum clamping voltage (VC) of 13.6 V at its rated peak impulse current (IPP) of 1324 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01215 datasheet and ensures downstream circuitry remains within safe operating voltage limits during severe transients. The MPLAD18KP8.0A maintains this clamping performance across its full operating temperature range.

Is the MPLAD18KP8.0A suitable for automotive applications requiring AEC-Q101 qualification?

Yes, the MPLAD18KP8.0A is explicitly tested and qualified to AEC-Q101 standards, as confirmed in the RF01215 Rev B datasheet. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and surge endurance - making it appropriate for under-hood automotive use such as engine control units and battery management systems. The MPLAD18KP8.0A also supports load dump protection per ISO 7637-2 Pulse 5a/b.

How does the PLAD package of the MPLAD18KP8.0A improve thermal performance compared to standard SMC or SMB packages?

The PLAD package of the MPLAD18KP8.0A features an exposed metal base that serves as both the cathode terminal and primary thermal path, achieving a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W - over 5× better than typical SMC packages (~4–5 °C/W). This enables direct mounting to heatsinks or large PCB copper areas, allowing the MPLAD18KP8.0A to sustain repetitive 18 kW surges without thermal saturation. The design eliminates reliance on PCB traces for heat dissipation.

Does the MPLAD18KP8.0A meet RTCA DO-160F lightning protection requirements?

Yes, the MPLAD18KP8.0A is validated for RTCA DO-160F Section 22 lightning-induced transient susceptibility, specifically Waveform 4 (6.4/69 μs) at Level 4. Its 13.6 V clamping voltage at 1324 A ensures compliance when mounted per recommended pad layout on FR4. The MPLAD18KP8.0A is also rated for multi-stroke lightning events, a key requirement for aircraft power distribution systems.

What is the polarity configuration and marking convention for the MPLAD18KP8.0A?

The MPLAD18KP8.0A is a unidirectional TVS diode with cathode on the exposed metal base (bottom side) and anode on the top metallization surface. Per the datasheet, "The cathode is the metal base under the body of this device." Polarity is indicated by part number suffix 'A' (unidirectional); bidirectional variants use 'CA'. No additional polarity marking is present on the body - orientation is defined solely by mechanical placement and thermal interface requirements.