Microchip Technology MPLAD36KP54A

Overview

MPLAD36KP54A 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 36 kW peak pulse power at 10/1000 μs, clamps transients to ≤87.1 V at 414 A, and features a 54 V reverse standoff voltage (V_WM) with 60.0–66.3 V breakdown range. It meets RTCA DO-160 Section 22 multi-stroke lightning requirements and IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source).

For engineers reviewing the MPLAD36KP54A datasheet, MPLAD36KP54A pinout, MPLAD36KP54A application, or MPLAD36KP54A equivalent, this device is selected for high-reliability DC bus protection where precise V_WM margining, low thermal resistance (1.0 °C/W junction-to-case), and verified surge endurance under repetitive lightning waveforms are critical design criteria.

Technical Context

This TVS diode operates as a clamping-type overvoltage protector, triggered when transient voltage exceeds its specified breakdown range (60.0–66.3 V at I_BR = 5 mA). Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained energy dissipation with R_θJC = 1.0 °C/W and R_θJA = 50 °C/W on FR4.

It is rated for 414 A peak impulse current (I_PP) at 10/1000 μs, with clamping voltage VC ≤ 87.1 V - a key parameter defining maximum protected-circuit stress during surge events. All units undergo 100% surge testing per AEC-Q101 and support MIL-PRF-19500 upscreening options for high-reliability programs.

Key Specifications

Pinout & Package

Package: PLAD (Plastic Leaded Anode Down) - surface-mount, low-profile thermoset epoxy case (UL94V-0), metal base cathode terminal, weight ≈1.8 g. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with recommended pad layout per RF01216 Rev B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ54A and SMCJ54A, the MPLAD36KP54A provides 24× and 24× higher peak pulse power respectively, enabling robust multi-stroke lightning protection with verified thermal performance via metal-base mounting - essential for mission-critical aerospace and automotive power systems.

Availability

MPLAD36KP54A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU load dump protection, and industrial motor drive DC link applications requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.

Supply support for MPLAD36KP54A 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 analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.

The MPLAD36KP54A belongs to the PLAD-series high-power TVS family engineered specifically for multi-stroke lightning protection in safety-critical platforms where thermal management, surge endurance, and qualification to DO-160 and AEC-Q101 are mandatory.

FAQ

What is the clamping voltage of the MPLAD36KP54A at its rated peak pulse current?

The MPLAD36KP54A has a maximum clamping voltage (V_C) of 87.1 V at its rated peak impulse current of 414 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01216 Rev B and defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The MPLAD36KP54A maintains this clamping performance across its operating temperature range when properly mounted with thermal interface to a heatsink.

Is the MPLAD36KP54A suitable for bidirectional surge protection?

No, the MPLAD36KP54A is a unidirectional TVS diode, indicated by the "A" suffix (not "CA"). It conducts only during positive transients relative to its cathode (metal base). For bidirectional protection at 54 V standoff, the correct part is MPLAD36KP54CA. Using MPLAD36KP54A in AC or bipolar surge environments will result in forward conduction failure on negative half-cycles.

Does the MPLAD36KP54A require special PCB layout considerations?

Yes - the MPLAD36KP54A requires a dedicated thermal pad layout per RF01216 Rev B: 11.94 × 5.85 mm copper area on the bottom layer, connected to internal ground planes via ≥4 thermal vias (1.15 mm diameter). The metal cathode must make low-resistance contact with this pad to achieve the specified 1.0 °C/W R_θJC. Failure to implement this layout risks thermal runaway during repetitive surges.

What standards does the MPLAD36KP54A meet for lightning protection?

The MPLAD36KP54A is validated for RTCA DO-160 Section 22 multi-stroke lightning (Waveform 3, 10/1000 μs) and IEC 61000-4-5 secondary lightning protection at Class 4 with 42 Ω source impedance. It also supports Class 3 with 12 Ω and Class 2 with 2 Ω source impedances per the manufacturer's test matrix in RF01216 Rev B - making it suitable for aircraft, rail, and industrial infrastructure applications.

Can the MPLAD36KP54A be used in automotive applications?

Yes - the MPLAD36KP54A is AEC-Q101 qualified and widely deployed for 12 V and 24 V automotive load dump protection in ECUs, battery management systems, and ADAS power supplies. Its 54 V V_WM provides appropriate margin above nominal 48 V systems, and its 414 A I_PP exceeds ISO 7637-2 Pulse 5a requirements. Full qualification data and lot traceability are provided per RF01216 Rev B.