Microchip Technology MAPLAD36KP400CA

Overview

MAPLAD36KP400CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 36,000 W peak pulse power at 10/1000 μs, features a 400 V reverse standoff voltage (VWM), clamps to ≤644 V at 50 A peak pulse current, and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.

For engineers reviewing the MAPLAD36KP400CA datasheet, MAPLAD36KP400CA pinout, MAPLAD36KP400CA application, or MAPLAD36KP400CA equivalent, key selection criteria include bidirectional polarity, IEC 61000-4-5 Class 5 secondary lightning protection with 42 Ω source impedance, DO-160F Waveform 4 Level 4 compliance, thermal resistance of 1.0 °C/W junction-to-case, and RoHS-compliant e3 plating.

Technical Context

The MAPLAD36KP400CA employs an avalanche breakdown structure optimized for fast response (<5 ns clamping time) and low thermal resistance. Its void-free transfer-molded UL94V-0 epoxy package enables direct metal-base heat sinking, supporting sustained surge handling under 0.05% duty cycle conditions per Figure 1 and Figure 2 waveforms.

It operates across –55 °C to +150 °C junction temperature range and maintains stable breakdown voltage (389–431 V at I(BR)) with ±0.1 mV/°C temperature coefficient. Standby leakage is limited to 10 μA at 400 V VWM, ensuring minimal system loading during normal operation.

Key Specifications

Pinout & Package

MAPLAD36KP400CA uses a surface-mount PLAD package with metal base cathode (bidirectional symmetry eliminates polarity marking). Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1.7–2.0 g. Recommended pad layout per RF01216 Rev B: 11.94 mm × 5.85 mm footprint with 2.44 mm solder mask opening.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Littelfuse SP3050-040HDT and Vishay SMAJ400CA, the MAPLAD36KP400CA uniquely supports multi-stroke lightning endurance, DO-160F Waveform 4 Level 4, and 36 kW single-pulse dissipation in a thermally optimized surface-mount package-making it irreplaceable for certified avionics and high-reliability automotive power systems.

Availability

MAPLAD36KP400CA is available at Aetrix Electronics and suitable for avionics power distribution, automotive 48 V battery management, and industrial motor drive input protection requiring stable component supply and full DO-160/IEC 61000-4-5 compliance.

Supply support for MAPLAD36KP400CA 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, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.

The MAPLAD36KP400CA belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning survival and DO-160F-certified avionics surge protection in surface-mount form.

FAQ

What is the clamping voltage of MAPLAD36KP400CA at its rated peak pulse current?

The MAPLAD36KP400CA has a maximum clamping voltage (VC) of 644 V at 50 A peak pulse current (IPP) 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 worst-case surge events. The clamping performance remains stable across –55 °C to +150 °C operating temperatures.

Is MAPLAD36KP400CA compliant with RTCA DO-160F Section 22 lightning testing?

Yes, MAPLAD36KP400CA is validated for RTCA DO-160F Section 22 multi-stroke lightning testing. It meets Waveform 4 (6.4/69 μs) Level 4 protection up to 400 V VWM devices and supports full certification when mounted per recommended pad layout. The device's 36 kW rating and <5 ns response ensure robustness against repeated lightning-induced transients in aircraft electrical systems.

Does MAPLAD36KP400CA require dry packing before reflow soldering?

No, MAPLAD36KP400CA has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1 rating, meaning it does not require dry packing or baking prior to SMT reflow. The device can be stored and processed under standard factory humidity conditions, simplifying manufacturing flow and reducing handling overhead compared to higher MSL-rated components.

What is the thermal resistance from junction to case for MAPLAD36KP400CA?

The MAPLAD36KP400CA has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, as specified in the "MAXIMUM RATINGS" table of RF01216 Rev B. This low value is achieved via direct metal-base mounting and enables efficient heat transfer to PCB copper pours or external heatsinks-critical for sustaining multiple surge events without thermal runaway.

Can MAPLAD36KP400CA be used in automotive applications?

Yes, MAPLAD36KP400CA is AEC-Q101 qualified and rated for automotive use, including 48 V mild-hybrid battery management systems. Its 400 V VWM, 36 kW pulse rating, and bidirectional capability make it suitable for protecting DC/DC converters and motor controllers from load dump and alternator transients-provided thermal design follows Microsemi's recommended pad layout and copper area guidelines.