Microchip Technology MPLAD18KP58CAE3

Overview

MPLAD18KP58CAE3 from Microsemi is a bidirectional 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 58 V reverse standoff voltage (VWM), clamps to ≤93.6 V at 207 A peak impulse current (IPP), and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–4 lightning standards.

For engineers reviewing the MPLAD18KP58CAE3 datasheet, MPLAD18KP58CAE3 pinout, MPLAD18KP58CAE3 application, or MPLAD18KP58CAE3 equivalent, key selection criteria include bidirectional clamping capability, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant matte-tin plating, and verified compliance with aircraft secondary lightning protection requirements under 42 Ω and 12 Ω source impedances.

Technical Context

This TVS diode employs an avalanche breakdown structure optimized for multi-stroke lightning transients per RTCA DO-160 Section 22. Its metal-base cathode construction enables direct thermal coupling to PCB copper or heatsinks, supporting sustained surge handling with minimal junction temperature rise.

It operates as a voltage-clamped shunt protector: when transient voltage exceeds the 64.4–71.2 V breakdown range (V(BR) @ I(BR)), it switches into low-impedance conduction within <5 ns, limiting downstream voltage to ≤93.6 V while diverting up to 207 A of 10/1000 μs impulse current.

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal on underside; void-free UL94V-0 epoxy body; dimensions 12.32 × 10.54 × 5.33 mm (L × W × H); weight ≈1 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ58CA and SMCJ58CA, the MPLAD18KP58CAE3 delivers 30× higher peak power, 3.6× lower thermal resistance, and certified multi-stroke lightning performance - making it the only option for DO-160F-compliant avionics and high-reliability automotive ECU protection.

Availability

MPLAD18KP58CAE3 is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU protection, and industrial motor drive monitoring requiring stable component supply across extended production lifecycles.

Supply support for MPLAD18KP58CAE3 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.

The MPLAD18KP58CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning and load-dump protection in safety-critical platforms where thermal robustness and certification traceability are mandatory.

FAQ

What does the "CA" suffix indicate in MPLAD18KP58CAE3?

The "CA" suffix in MPLAD18KP58CAE3 denotes bidirectional construction, meaning the device provides symmetrical clamping for both positive and negative transients. This is essential for protecting AC-coupled lines, floating differential buses, or ungrounded systems where polarity cannot be assumed. Unlike unidirectional variants (e.g., MPLAD18KP58AE3), the CA version has identical V(BR) and VC characteristics in both directions, validated per IEC 61000-4-5 and RTCA DO-160F test waveforms.

Does MPLAD18KP58CAE3 require a heatsink for standard operation?

MPLAD18KP58CAE3 does not require an external heatsink for single-event surge suppression, but its metal base must be soldered to a minimum 10 cm² copper pad (2 oz Cu) to achieve the specified RθJC = 0.7 °C/W. For repetitive surges (>0.05% duty factor), thermal derating per Figure 3 in RF01215 Rev B applies. The device's low thermal resistance enables direct PCB copper to serve as the primary heatsink - no mechanical fasteners or thermal interface materials are needed if layout follows the recommended pad dimensions (12.32 × 10.54 mm).

Is MPLAD18KP58CAE3 qualified to AEC-Q101?

Yes, MPLAD18KP58CAE3 is tested in accordance with AEC-Q101 requirements for discrete semiconductors, including stress testing for temperature cycling, humidity bias, and surge robustness. This qualification confirms suitability for automotive under-hood applications such as engine control units and transmission control modules. The "E3" suffix further indicates RoHS-compliant matte-tin plating, satisfying automotive solderability and corrosion resistance standards per JESD22-A110.

How does MPLAD18KP58CAE3 perform under RTCA DO-160F Waveform 4?

MPLAD18KP58CAE3 is certified to RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) at Level 4 (500 V), meeting the stringent pin-injection surge immunity required for commercial aircraft avionics. Its <5 ns response time and 93.6 V clamping voltage ensure protected circuits remain below 12 V logic thresholds during transients. Performance is validated across temperature (−55 °C to +125 °C) and after 1000+ surge cycles - data confirmed in Microsemi's RF01215 Rev B test report.

Can MPLAD18KP58CAE3 replace older PLAD-series parts like MPLAD18KP58CA?

Yes, MPLAD18KP58CAE3 is a direct replacement for MPLAD18KP58CA, with identical electrical specifications, package dimensions, and thermal performance. The "E3" suffix indicates RoHS-compliant matte-tin plating versus legacy tin-lead, but solderability, reflow profile compatibility (up to 260 °C for 10 s), and mechanical footprint are fully maintained. No PCB layout changes or qualification retesting are required when upgrading from non-RoHS to E3 versions within the same PLAD family.