Microchip Technology MAPLAD18KP12CA

Overview

MAPLAD18KP12CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤19.9 V under 905 A peak impulse current, and features 12 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (13.3–14.7 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.

For engineers reviewing the MAPLAD18KP12CA datasheet, MAPLAD18KP12CA pinout, MAPLAD18KP12CA application, or MAPLAD18KP12CA equivalent, this device is selected for high-reliability DC bus protection in avionics power distribution units, engine control modules, and airborne communication interfaces where multi-stroke lightning immunity and low thermal resistance are critical.

Technical Context

The MAPLAD18KP12CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and low dynamic impedance under high-current transients. Its metal-base package enables direct thermal coupling to heatsinks, achieving 0.7 °C/W junction-to-case thermal resistance - essential for sustaining repeated 18 kW surges without cumulative heating.

It operates bidirectionally with symmetrical clamping behavior, supports 100% surge testing per lot, and maintains stable performance across –55°C to +150°C junction temperature range. The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and RTCA DO-160F pin-injection standards, with derating defined for pulse repetition rates ≤0.05% duty factor.

Key Specifications

Pinout & Package

MAPLAD18KP12CA uses a surface-mount PLAD package with metal base acting as cathode terminal for unidirectional variants; for bidirectional operation (CA suffix), both terminals are symmetrical and non-polarized. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) with tin-plated terminations solderable per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ12CA and SMCJ12CA, the MAPLAD18KP12CA provides 30× higher pulse power handling, 0.7 °C/W thermal resistance enabling direct heatsink mounting, and formal DO-160F/IEC 61000-4-5 certification - making it uniquely suited for aerospace primary surge protection where reliability under multi-stroke lightning is non-negotiable.

Availability

MAPLAD18KP12CA is available at Aetrix Electronics and suitable for aerospace power distribution, automotive engine control, avionics sensor interface, and industrial motor drive applications requiring stable component supply across extended product lifecycles.

Supply support for MAPLAD18KP12CA 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) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.

The MAPLAD18KP12CA belongs to Microsemi's high-power PLAD TVS family, engineered specifically for mission-critical surge protection in environments demanding RTCA DO-160 compliance, AEC-Q101 qualification, and multi-stroke lightning resilience.

FAQ

What is the clamping voltage of MAPLAD18KP12CA at its rated peak pulse current?

The MAPLAD18KP12CA has a maximum clamping voltage (VC) of 19.9 V at 905 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures protected circuits remain below critical overvoltage thresholds during lightning transients. The low clamping ratio (VC/VWM ≈ 1.66) reflects optimized avalanche dynamics for minimal let-through energy.

Is MAPLAD18KP12CA compliant with RoHS and lead-free assembly requirements?

Yes, MAPLAD18KP12CA is RoHS compliant (e3 marking), featuring annealed matte-tin plating on terminations compatible with standard Pb-free reflow profiles up to 260°C for 10 seconds. Its void-free epoxy body meets UL94V-0 flammability rating, and moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - eliminating need for dry-pack or baking prior to assembly.

Does MAPLAD18KP12CA require heatsinking for continuous operation?

MAPLAD18KP12CA does not require active heatsinking for single-event surge suppression, but its 0.7 °C/W junction-to-case thermal resistance is intended for mounting on large PCB copper pours or external heatsinks when subjected to repetitive surges (e.g., DO-160 multi-stroke testing). Steady-state power dissipation is limited to 2.5 W at 25°C ambient, so thermal design must account for cumulative heating in high-duty-cycle applications.

How is polarity identified on the MAPLAD18KP12CA package?

MAPLAD18KP12CA is a bidirectional device (denoted by "CA" suffix), meaning it has no functional polarity - both terminals behave identically under positive or negative transients. Unlike unidirectional variants (e.g., MAPLAD18KP12A), it lacks cathode marking or directional asymmetry; the metal base serves only as a thermal interface and is not electrically isolated or designated as anode/cathode.

Which industry standards does MAPLAD18KP12CA meet for lightning protection?

MAPLAD18KP12CA meets RTCA DO-160F Section 22 lightning-induced transient requirements (Waveform 4 Level 4 and Waveform 5A Level 4), IEC 61000-4-5 secondary lightning protection (Classes 1–5 at 42 Ω source, Classes 1–4 at 12 Ω), and IEC 61000-4-2/4-4 for ESD and EFT immunity. These certifications are validated per Microsemi RF01215 Rev B test reports and apply directly to the MAPLAD18KP12CA variant.