Microchip Technology MAPLAD18KP11AE3

Overview

MAPLAD18KP11AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 11 V reverse standoff voltage (VWM), clamps to ≤18.2 V at 989 A peak current, and exhibits <100 ps response time. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22.

For engineers reviewing the MAPLAD18KP11AE3 datasheet, MAPLAD18KP11AE3 pinout, MAPLAD18KP11AE3 application, or MAPLAD18KP11AE3 equivalent, key selection criteria include its 11 V VWM rating, 18.2 V max clamping voltage at 989 A, RoHS-compliant e3 plating, low thermal resistance (RθJC = 0.7 °C/W), and qualification to AEC-Q101 and MIL-PRF-19500 screening levels.

Technical Context

The MAPLAD18KP11AE3 employs an avalanche diode structure optimized for fast transient suppression with sub-100 ps turn-on. Its metal-base cathode configuration enables direct thermal coupling to PCB copper or heatsinks, supporting high-repetition surges under ≤0.05% duty cycle per Figure 1.

It meets secondary lightning immunity per IEC 61000-4-5 with 42 Ω, 12 Ω, and 2 Ω source impedances (Classes 1–5 depending on impedance), and satisfies RTCA DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4) pin-injection requirements for avionics.

Key Specifications

Pinout & Package

MAPLAD18KP11AE3 uses a surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side), enabling direct thermal path to PCB ground plane or heatsink. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ11A and SMCJ11A, MAPLAD18KP11AE3 provides 30× higher peak power, 0.7 °C/W junction-to-case thermal resistance for superior thermal management, and documented compliance with RTCA DO-160F Section 22 - making it the only option qualified for primary lightning protection in certified avionics.

Availability

MAPLAD18KP11AE3 is available at Aetrix Electronics and suitable for aerospace lightning protection, automotive load dump suppression, and industrial motor drive input protection requiring stable component supply across extended production lifecycles.

Supply support for MAPLAD18KP11AE3 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 MAPLAD18KP11AE3 belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load-dump immunity in safety-critical platforms where thermal performance and qualification rigor are non-negotiable.

FAQ

What is the clamping voltage of MAPLAD18KP11AE3 at its rated peak pulse current?

The MAPLAD18KP11AE3 has a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current (IPP) of 989 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01215 datasheet and ensures downstream components see limited overvoltage during surge events. The clamping performance is guaranteed across the full operating temperature range and supports design margining for 20 V-rated ICs.

Is MAPLAD18KP11AE3 qualified for automotive applications?

Yes, MAPLAD18KP11AE3 is qualified to AEC-Q101 for stress testing including HTGB, HTRB, and temperature cycling. Its construction, wafer-level traceability, and surge testing align with automotive under-hood and powertrain requirements. However, system-level validation per ISO 7637-2 or ISO 16750-2 remains the responsibility of the end designer, as Microsemi specifies electrical parameters-not full-system compliance.

Does MAPLAD18KP11AE3 require special PCB layout considerations?

Yes. MAPLAD18KP11AE3 requires a minimum 100 mm² copper pad on the cathode side (metal base) per the recommended pad layout in RF01215 Rev B. This ensures effective thermal dissipation given its 0.7 °C/W RθJC. Trace inductance must be minimized: keep anode/cathode traces short and wide, avoid vias in surge current paths, and place the device as close as possible to the protected connector or input stage.

What does the "E3" suffix in MAPLAD18KP11AE3 signify?

The "E3" suffix in MAPLAD18KP11AE3 indicates RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity. It replaces legacy tin-lead terminations while maintaining solderability per MIL-STD-750 Method 2026. No dry-pack or baking is required before reflow, simplifying manufacturing and eliminating moisture-related popcorning risks during assembly.

Can MAPLAD18KP11AE3 be used in bidirectional configurations?

No - MAPLAD18KP11AE3 is unidirectional. For bidirectional operation, the equivalent part is MAPLAD18KP11CA (same VWM, V(BR), and PPP). The "CA" suffix denotes bidirectional construction, with symmetrical clamping in both polarities. Using MAPLAD18KP11AE3 in AC or differential signal paths would result in forward conduction and failure during negative transients.