Microchip Technology MAPLAD18KP15CA

Overview

MAPLAD18KP15CA 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 ≤24.4 V under 738 A peak impulse current, and features a 15 V reverse standoff voltage (VWM) with ±15 mV/°C temperature coefficient of breakdown voltage. 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 MAPLAD18KP15CA datasheet, MAPLAD18KP15CA pinout, MAPLAD18KP15CA application, or MAPLAD18KP15CA equivalent, this device is selected for high-reliability DC bus protection where low clamping voltage, multi-stroke lightning resilience, and thermal robustness under repeated transients are critical design criteria.

Technical Context

The MAPLAD18KP15CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and low thermal resistance (RθJC = 0.7 °C/W), enabling efficient heat transfer to the PCB copper pad. Its bidirectional construction supports symmetrical surge suppression on AC-coupled or floating signal/power lines without polarity constraints.

It is characterized for operation across –55°C to +150°C junction temperature, with derated peak pulse power above 100°C case temperature per Figure 3. Standby leakage is limited to 10 μA at 15 V VWM, ensuring minimal impact on system quiescent current in always-on applications.

Key Specifications

Pinout & Package

MAPLAD18KP15CA uses a surface-mount PLAD package with two terminals: anode and cathode formed on opposite sides of the metal base. The cathode is the metal backside (package bottom); polarity is marked on the body per Microsemi standard marking practice. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with recommended FR4 pad layout per RF01215 Rev B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAPLAD18KP15CA, SMBJ15CA and SMCJ15CA offer lower cost and smaller footprints but cannot sustain the 18,000 W peak pulse power, multi-stroke endurance, or low-impedance thermal path required for aerospace, heavy-duty automotive, or Class 4+ lightning protection-making MAPLAD18KP15CA the only option for designs demanding verified DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 5 compliance.

Availability

MAPLAD18KP15CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain modules, and industrial motor drive systems requiring stable component supply with long-term lifecycle assurance and traceable sourcing.

Supply support for MAPLAD18KP15CA 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 components for aerospace, defense, and industrial markets.

The MAPLAD18KP15CA belongs to Microsemi's high-power PLAD-series TVS family, engineered specifically for mission-critical surge protection where multi-stroke lightning resilience, AEC-Q101 reliability, and low thermal resistance are mandatory.

FAQ

What is the clamping voltage specification for MAPLAD18KP15CA under peak surge conditions?

The MAPLAD18KP15CA has a maximum clamping voltage (VC) of 24.4 V at 738 A peak pulse current (IPP) under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and reflects the actual voltage seen by downstream circuitry during worst-case surge events, enabling precise overvoltage margin analysis for 24 V systems.

Does MAPLAD18KP15CA meet RTCA DO-160F lightning test requirements?

Yes, MAPLAD18KP15CA is explicitly rated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 at 25°C, and Waveform 5A Level 4 up to 36 V VWM variants. Its 18,000 W peak pulse power and low clamping voltage ensure compliance with multi-stroke lightning standards essential for commercial and military avionics I/O protection.

How is thermal management implemented for MAPLAD18KP15CA in high-duty-cycle applications?

MAPLAD18KP15CA achieves a junction-to-case thermal resistance of 0.7 °C/W by using its metal base as the primary thermal path. Engineers must mount it on a minimum 12.32 mm × 10.54 mm copper pad per RF01215 Rev B, optionally connected to an internal ground plane or external heatsink. Derating curves in Figure 3 define safe PPP limits above 100°C case temperature.

Is MAPLAD18KP15CA compliant with automotive reliability standards?

Yes, MAPLAD18KP15CA is qualified to AEC-Q101 for stress testing including temperature cycling, humidity bias, and mechanical shock. Its wafer fabrication and assembly lot traceability, plus 3σ screening on standby current (ID), support use in automotive powertrain, chassis, and body control modules requiring zero-defect reliability.

What does the "CA" suffix indicate in MAPLAD18KP15CA?

The "CA" suffix in MAPLAD18KP15CA denotes bidirectional construction, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., MAPLAD18KP15A), it requires no polarity alignment during placement and is ideal for AC-coupled lines, differential buses, or floating references where voltage polarity is undefined.