Microchip Technology MAPLAD18KP30AE3

Overview

MAPLAD18KP30AE3 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 ≤48.4 V under 372 A peak impulse current, and features 30 V reverse standoff voltage (VWM), 33.3–36.8 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance.

For engineers reviewing the MAPLAD18KP30AE3 datasheet, MAPLAD18KP30AE3 pinout, MAPLAD18KP30AE3 application, or MAPLAD18KP30AE3 equivalent, key selection criteria include its DO-160F Waveform 4 Level 4 compliance, IEC 61000-4-5 Class 1–5 secondary lightning protection capability, RoHS-compliant e3 plating, and low-profile thermoset epoxy package optimized for thermal management on FR4 PCBs.

Technical Context

This TVS diode operates as a clamping device in parallel with sensitive circuitry to divert high-energy transients-such as lightning-induced surges, load dump spikes, and EFT events-away from downstream components. Its unidirectional polarity and metal-base cathode configuration enable efficient heat sinking when mounted on a thermal pad.

It meets AEC-Q101 reliability standards and supports multi-stroke surge endurance per RTCA DO-160 Section 22. The device's 50 °C/W junction-to-ambient thermal resistance (on FR4) and 0.7 °C/W junction-to-case rating confirm its suitability for high-power transient suppression where thermal dissipation is critical.

Key Specifications

Pinout & Package

The MAPLAD18KP30AE3 uses a low-profile, void-free transfer-molded thermosetting epoxy package (UL94V-0 rated) with tin-lead or RoHS-compliant matte-tin plating. The cathode is the metal base (underside), and the anode is the top-side metallized terminal. Recommended pad layout per RF01215 Rev B specifies 12.32–12.57 mm × 10.54–10.80 mm footprint with thermal via support.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ30A and SMCJ33A, the MAPLAD18KP30AE3 provides over 12× higher peak pulse power, certified multi-stroke lightning resilience, and traceable high-reliability screening-making it irreplaceable in safety-critical platforms where single-event surge survival is non-negotiable.

Availability

MAPLAD18KP30AE3 is available at Aetrix Electronics and suitable for aircraft power distribution, automotive alternator protection, and industrial motor drive inputs requiring stable component supply across extended production lifecycles.

Supply support for MAPLAD18KP30AE3 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, communications, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.

The PLAD family-including MAPLAD18KP30AE3-is engineered specifically for high-energy transient suppression in certified avionics and automotive systems, combining ultra-high PPP ratings with rigorous environmental and reliability validation.

FAQ

What is the clamping voltage of MAPLAD18KP30AE3 at its rated peak pulse current?

The MAPLAD18KP30AE3 has a maximum clamping voltage (VC) of 48.4 V at 372 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The clamping performance is validated across temperature and production lots.

Does MAPLAD18KP30AE3 meet DO-160F Section 22 lightning test requirements?

Yes, MAPLAD18KP30AE3 is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing. It achieves Level 4 for pin injection (Waveform 4, 6.4/69 μs) and supports Class 1–5 secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance-key requirements for commercial and military aircraft power systems.

Is MAPLAD18KP30AE3 RoHS compliant, and what does the "E3" suffix indicate?

Yes, MAPLAD18KP30AE3 is RoHS compliant. The "E3" suffix denotes annealed matte-tin plating per JEDEC standards, ensuring compatibility with lead-free reflow processes and long-term solder joint integrity. This plating meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, eliminating the need for dry-pack handling prior to assembly.

How is thermal management implemented for MAPLAD18KP30AE3 in high-power surge scenarios?

Thermal management for MAPLAD18KP30AE3 relies on its metal-base cathode acting as the primary heat path. With a junction-to-case thermal resistance of 0.7 °C/W, the device must be soldered to a large copper pour or external heatsink. The recommended pad layout (12.32–12.57 mm × 10.54–10.80 mm) includes thermal vias to enhance conduction into inner layers-critical for sustaining repeated 18 kW surges without thermal runaway.

Can MAPLAD18KP30AE3 be used in bidirectional configurations?

No-MAPLAD18KP30AE3 is a unidirectional TVS. For bidirectional operation, the equivalent part is MAPLAD18KP30CA (with "CA" suffix). The "A" suffix in MAPLAD18KP30AE3 confirms unidirectional polarity, where the cathode is the metal base and the anode is the top metallization. Using MAPLAD18KP30AE3 in AC or bipolar signal paths would result in forward conduction and potential failure.