Microchip Technology MPLAD18KP13CAE3

Overview

MPLAD18KP13CAE3 from Microsemi is a bidirectional 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, features a 13 V reverse standoff voltage (VWM), clamps to ≤21.5 V at 838 A peak current, 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 MPLAD18KP13CAE3 datasheet, MPLAD18KP13CAE3 pinout, MPLAD18KP13CAE3 application, or MPLAD18KP13CAE3 equivalent, key selection criteria include its bidirectional polarity, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, 100% surge-tested reliability, and suitability for multi-stroke lightning environments per DO-160 Section 22.

Technical Context

This TVS diode operates as a clamping device in parallel with protected circuitry, responding to transients faster than 5 ns. Its silicon avalanche structure enables precise breakdown at 14.4–15.9 V (V(BR) @ I(BR)), with temperature coefficient αV(BR) of +12 mV/°C - critical for stable clamping across -55°C to +150°C junction range.

Designed for surface-mount implementation on FR4 PCBs with specified pad layout, it leverages metal-base cathode construction for efficient heat transfer to heatsinks. The device supports both 42 Ω and 12 Ω source impedance configurations per IEC 61000-4-5, and passes ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) immunity testing.

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Low-profile Avalanche Diode) with metal base cathode; void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; weight ≈1 g; moisture sensitivity level (MSL) 1 - no dry pack required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ13CA and SMCJ13CA, the MPLAD18KP13CAE3 provides 30× higher peak power handling, certified multi-stroke endurance, and full DO-160F/IEC 61000-4-5 Class 5 compliance - making it the sole option for aerospace power distribution and automotive safety-critical ECUs requiring AEC-Q101 and MIL-PRF-19500 upscreening readiness.

Availability

MPLAD18KP13CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MPLAD18KP13CAE3 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 semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened ICs, timing solutions, and robust discrete components.

The MPLAD18KP13CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection in safety-critical platforms where failure is not an option - including fly-by-wire systems, rail signaling, and military vehicle electronics.

FAQ

What is the clamping voltage of the MPLAD18KP13CAE3 at its rated peak pulse current?

The MPLAD18KP13CAE3 has a maximum clamping voltage (VC) of 21.5 V when subjected to its peak pulse current (IPP) of 838 A under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream circuitry remains below safe voltage thresholds during surge events. The MPLAD18KP13CAE3 achieves this clamping performance while maintaining bidirectional symmetry and low thermal resistance.

Does the MPLAD18KP13CAE3 meet RTCA DO-160F lightning protection requirements?

Yes, the MPLAD18KP13CAE3 is qualified for RTCA DO-160F Section 22 lightning-induced transient testing, specifically Waveform 4 (6.4/69 μs) at Level 4 for devices with VWM up to 130 V. As a 13 V standoff device, it falls within the Level 4 eligibility range and is explicitly listed in RF01215 Rev B for this compliance. The MPLAD18KP13CAE3 also supports Waveform 5A at Level 4 for lower-voltage variants.

How is thermal management implemented for the MPLAD18KP13CAE3 in high-power applications?

The MPLAD18KP13CAE3 uses its metal base as the cathode terminal and primary thermal path, achieving a junction-to-case thermal resistance (RθJC) of 0.7 °C/W when mounted per recommended pad layout on FR4 with thermal vias. Effective heat dissipation requires direct soldering of the metal base to a copper pour or heatsink - the MPLAD18KP13CAE3 cannot rely on PCB traces alone for thermal relief due to its 18 kW pulse rating.

Is the MPLAD18KP13CAE3 RoHS compliant, and what does the 'e3' suffix indicate?

Yes, the MPLAD18KP13CAE3 is RoHS compliant, as confirmed by the 'e3' suffix in its part number. Per Microsemi nomenclature, 'e3' denotes annealed matte-tin plating that meets RoHS Directive 2011/65/EU requirements and is compatible with standard lead-free reflow profiles. The MPLAD18KP13CAE3 undergoes IPC/JEDEC J-STD-020B moisture classification Level 1, eliminating the need for dry-packaging prior to assembly.

What is the significance of the 'CA' in MPLAD18KP13CAE3, and how does it affect circuit design?

The 'CA' in MPLAD18KP13CAE3 indicates bidirectional construction, meaning the device clamps symmetrically for both positive and negative transients - essential for protecting AC-coupled lines, differential buses, or ungrounded systems. Unlike unidirectional variants (e.g., MPLAD18KP13AE3), the MPLAD18KP13CAE3 requires no polarity-aware placement and provides identical V(BR) and VC characteristics in either direction, simplifying layout and enhancing fault tolerance.