Microchip Technology MAPLAD36KP22A

Overview

MAPLAD36KP22A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps transients to ≤36.4 V at 990 A, and features a 22 V reverse standoff voltage (VWM), 24.4–26.9 V breakdown voltage (V(BR)), and 1.0 °C/W junction-to-case thermal resistance - enabling robust secondary lightning protection per RTCA DO-160 Section 22 and IEC 61000-4-5.

For engineers reviewing the MAPLAD36KP22A datasheet, MAPLAD36KP22A pinout, MAPLAD36KP22A application, or MAPLAD36KP22A equivalent, key selection criteria include its 22 V VWM rating, 990 A IPP capability, low-profile PLAD package with metal-base cathode, and compliance with AEC-Q101 and MIL-PRF-19500 screening options for high-reliability deployments.

Technical Context

The MAPLAD36KP22A employs an avalanche diode structure optimized for fast response (<100 ps clamping rise time) and high cumulative energy handling. Its metal-base thermal path enables direct heatsink mounting, achieving RθJC = 1.0 °C/W - critical for sustained multi-stroke lightning events under RTCA DO-160 Waveform 4 and 5A testing.

It operates as a unidirectional clamp with cathode on the metal base (bottom side), requiring PCB pad layout per specification RF01216 Rev B. Standby current ID is ≤10 μA at 22 V, and temperature coefficient αV(BR) is +20 mV/°C - ensuring stable breakdown across -55°C to +150°C junction range.

Key Specifications

Pinout & Package

MAPLAD36KP22A uses the PLAD surface-mount package: void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.08 mm), matte-tin plated terminals, and metal base acting as cathode terminal. Mounting requires recommended FR4 pad layout (A = 11.94 mm, B = 5.85 mm) for optimal thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ22A and SMCJ22A, MAPLAD36KP22A provides 24× higher peak power, direct metal-base thermal coupling for sustained duty, and documented compliance with RTCA DO-160F Section 22 - making it the only option qualified for certified aircraft secondary lightning protection at 22 V.

Availability

MAPLAD36KP22A is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU, industrial PLC, and railway signaling applications requiring stable component supply, long-term lifecycle support, and high-reliability surge protection.

Supply support for MAPLAD36KP22A 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The MAPLAD36KP22A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical 24 V DC systems where thermal stability and multi-event endurance are mandatory.

FAQ

What is the maximum clamping voltage of the MAPLAD36KP22A at its rated peak pulse current?

The MAPLAD36KP22A has a maximum clamping voltage (VC) of 36.4 V at its rated peak pulse current (IPP) of 990 A under 10/1000 μs waveform conditions. This value is specified in the official RF01216 Rev B datasheet and ensures downstream circuitry remains below safe overvoltage thresholds during full-rated surge events. The MAPLAD36KP22A maintains this clamping performance across its operational temperature range.

Is the MAPLAD36KP22A RoHS compliant, and what does the 'e3' marking indicate?

Yes, the MAPLAD36KP22A is RoHS compliant, indicated by the 'e3' suffix in its full part number per Microsemi nomenclature. The 'e3' designation confirms matte-tin plating meeting JEDEC J-STD-020B Level 1 moisture sensitivity and lead-free reflow compatibility. This applies to all standard MAPLAD36KP22A units supplied by Aetrix Electronics unless otherwise specified in order documentation.

How is polarity configured on the MAPLAD36KP22A, and where is the cathode located?

The MAPLAD36KP22A is a unidirectional TVS with the cathode located on the metal base (bottom surface) of the PLAD package. The top surface pad serves as the anode. This configuration is explicitly stated in the RF01216 datasheet: "The cathode is the metal base under the body of this device." Correct orientation is essential for proper clamping function and thermal performance in the MAPLAD36KP22A.

Does the MAPLAD36KP22A meet AEC-Q101 qualification, and what tests are included?

Yes, the MAPLAD36KP22A is tested in accordance with AEC-Q101 requirements, including high-temperature operating life, temperature cycling, humidity bias, and surge testing. Microsemi documentation confirms AEC-Q101 qualification for the entire MPLAD36KPxxA series. This validation ensures the MAPLAD36KP22A meets automotive-grade reliability standards for under-hood and chassis-mounted applications.

What is the thermal resistance from junction to case (RθJC) for the MAPLAD36KP22A, and why is it critical?

The MAPLAD36KP22A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, measured with the metal base mounted to a heatsink per specification. This low value is critical because it enables rapid heat dissipation during repetitive surges - such as multi-stroke lightning events - preventing thermal runaway and ensuring long-term reliability. Without this metal-base thermal path, the MAPLAD36KP22A could not sustain its 36 kW rating.