Microchip Technology MAPLAD18KP60A

Overview

MAPLAD18KP60A 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 ≤96.8 V under 100 A peak impulse current, and features a 60 V reverse standoff voltage (VWM) with 66.7–73.7 V breakdown range. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22.

For engineers reviewing the MAPLAD18KP60A datasheet, MAPLAD18KP60A pinout, MAPLAD18KP60A application, or MAPLAD18KP60A equivalent, key selection criteria include its 0.7 °C/W junction-to-case thermal resistance, 50 °C/W junction-to-ambient rating on FR4, RoHS-compliant e3 plating, and compliance with IEC 61000-4-2/4-4/4-5 and RTCA DO-160F Waveform 4 & 5A pin injection standards.

Technical Context

The MAPLAD18KP60A employs an avalanche diode structure optimized for low clamping ratio and fast response (<100 ps), enabling effective suppression of multi-stroke lightning transients and load dump events. Its metal-base cathode construction provides direct thermal path to PCB copper, supporting high-reliability mounting on heat-sinked FR4 layouts.

It operates within -55°C to +150°C junction temperature range and meets AEC-Q101 stress testing requirements. Standby leakage is limited to 10 μA at 60 V, and forward clamping remains ≤2.0 V at 500 A, ensuring minimal interference during normal operation while maintaining robust fault-state conduction.

Key Specifications

Pinout & Package

MAPLAD18KP60A uses a low-profile, void-free thermosetting epoxy surface-mount package with tin-lead or RoHS-compliant matte-tin plating. The cathode is the metal base (bottom side), and the anode is the top-side metallized terminal. Recommended pad layout per RF01215 Rev B supports thermal management and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ60A and SMCJ60A, the MAPLAD18KP60A delivers 12× and 12× higher peak pulse power respectively, certified AEC-Q101 and RTCA DO-160F compliance, and superior thermal performance-making it the only viable option for aerospace-grade, multi-stroke, high-reliability surge protection.

Availability

MAPLAD18KP60A is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU power systems, and industrial motor drive DC bus protection requiring stable component supply across extended product lifecycles.

Supply support for MAPLAD18KP60A 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, radiation-tolerant, and aerospace-qualified analog and mixed-signal solutions.

The PLAD family-including MAPLAD18KP60A-is engineered for mission-critical surge protection in aviation, defense, and transportation systems where multi-stroke lightning resilience and AEC-Q101 validation are mandatory.

FAQ

What is the clamping voltage of MAPLAD18KP60A at its rated peak pulse current?

The MAPLAD18KP60A has a maximum clamping voltage (VC) of 96.8 V at 100 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per RF01215 Rev B and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The MAPLAD18KP60A maintains this clamping performance across its specified operating temperature range.

Is MAPLAD18KP60A qualified for automotive applications?

Yes, MAPLAD18KP60A is tested and qualified to AEC-Q101 standards for stress reliability, including high-temperature operating life, temperature cycling, and surge testing. It is specifically designed for automotive under-hood applications such as engine control units and battery management systems exposed to ISO 7637-2 load dump transients. The MAPLAD18KP60A's 60 V VWM and 100 A IPP rating align directly with 12 V/24 V system protection requirements.

Does MAPLAD18KP60A require moisture-sensitive handling?

No, MAPLAD18KP60A is rated Moisture Sensitivity Level 1 (MSL-1) per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without dry packing or baking prior to reflow soldering. This eliminates process overhead and reduces risk of popcorn cracking during assembly-unlike MSL-3 or higher TVS devices that mandate strict floor-life controls. The MAPLAD18KP60A's epoxy molding compound contributes to this robust moisture resistance.

How does the thermal performance of MAPLAD18KP60A compare to standard SMB/SMC TVS diodes?

MAPLAD18KP60A achieves a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W-over 10× lower than typical SMBJ60A (~10 °C/W) and SMCJ60A (~5 °C/W) devices. This enables significantly higher sustained power handling and reduced thermal derating. When mounted per recommended pad layout on FR4, MAPLAD18KP60A delivers full 18 kW pulse capability with minimal temperature rise, whereas standard packages would require parallel devices or active cooling. The MAPLAD18KP60A's metal-base cathode is integral to this advantage.

Can MAPLAD18KP60A be used for bidirectional protection?

No-MAPLAD18KP60A is a unidirectional TVS diode. For bidirectional protection at the same 60 V standoff, the designated variant is MAPLAD18KP60CA (note the "CA" suffix). The CA version features symmetrical breakdown in both polarities and is validated for AC-coupled signal lines and differential bus protection. Using MAPLAD18KP60A in bidirectional configurations risks catastrophic failure during negative transients, as it lacks reverse conduction capability. Always match polarity suffix to system topology.