Microchip Technology MPLAD18KP7.5A

Overview

MPLAD18KP7.5A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps to ≤12.9 V at 1396 A peak current, and features a 7.5 V reverse standoff voltage (VWM) with 8.33–9.21 V breakdown voltage (V(BR)). It meets RTCA DO-160 Section 22 multi-stroke lightning and IEC 61000-4-5 Class 1–5 secondary lightning standards.

For engineers reviewing the MPLAD18KP7.5A datasheet, MPLAD18KP7.5A pinout, MPLAD18KP7.5A application, or MPLAD18KP7.5A equivalent, key selection criteria include its 1396 A IPP rating, 12.9 V clamping voltage at rated surge, thermal resistance of 0.7 °C/W junction-to-case, RoHS-compliant e3 plating, and qualification per AEC-Q101 and MIL-PRF-19500 screening options.

Technical Context

The MPLAD18KP7.5A employs an avalanche diode structure optimized for low clamping voltage and minimal thermal resistance. Its metal-base package enables direct heatsinking, supporting junction-to-case thermal resistance of just 0.7 °C/W - critical for repeated surge events in avionics and load-dump scenarios.

It is characterized for operation across –55 °C to +150 °C junction temperature, with standby current ID ≤750 μA at VWM and temperature coefficient αV(BR) = 6.0 mV/°C. The device is surge-tested per IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (lightning), and validated for RTCA DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4).

Key Specifications

Pinout & Package

Package: Surface-mount PLAD (Plastic Low-profile Anode-down) with metal baseplate for thermal conduction. Dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), weight ≈1 g. Cathode is the metal base (bottom side); anode is top-side metallization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.5A and SMCJ7.5A, the MPLAD18KP7.5A provides 12–30× greater peak pulse power and full DO-160F/IEC 61000-4-5 Class 5 compliance - making it the only option for certified lightning protection in safety-critical platforms.

Availability

MPLAD18KP7.5A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC bus applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for MPLAD18KP7.5A 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 semiconductor solutions for aerospace, defense, communications, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and ruggedized discrete components.

The MPLAD series was developed specifically for high-energy transient suppression in mission-critical platforms - combining ultra-low thermal resistance, AEC-Q101 qualification, and full RTCA DO-160F lightning compliance in a surface-mount format.

FAQ

What is the maximum peak pulse current (IPP) rating for MPLAD18KP7.5A?

The MPLAD18KP7.5A has a maximum peak pulse current (IPP) rating of 1396 A under the standard 10/1000 μs waveform. This value is measured at the clamping voltage of 12.9 V and reflects the device's ability to safely divert high-energy transients without failure. The rating is validated per IEC 61000-4-5 and RTCA DO-160F test conditions, and applies only when the cathode baseplate is properly thermally coupled to a heatsink or large copper area.

Is MPLAD18KP7.5A qualified for automotive applications?

Yes, the MPLAD18KP7.5A is AEC-Q101 qualified for automotive applications. It undergoes stress testing including temperature cycling, humidity bias, and mechanical shock per the AEC-Q101 standard, confirming reliability in under-hood environments. Its 7.5 V VWM and 12.9 V clamping voltage make it suitable for protecting 5 V and 12 V automotive subsystems against load dump and ISO 7637-2 transients - though system-level validation remains the customer's responsibility.

Does MPLAD18KP7.5A require special PCB layout considerations?

Yes, the MPLAD18KP7.5A requires specific PCB layout: the metal cathode baseplate must be soldered to a minimum 25 mm² copper pour (ideally connected to internal ground plane via multiple vias) to achieve the specified 0.7 °C/W junction-to-case thermal resistance. Trace inductance between the device and protected node must be minimized - recommended pad layout is provided in RF01215 Rev B, and thermal derating curves apply above 100°C case temperature.

What is the polarity configuration of MPLAD18KP7.5A?

The MPLAD18KP7.5A is a unidirectional transient voltage suppressor, indicated by the "A" suffix (not "CA"). Its cathode is the metal baseplate (bottom side), and the anode is the top-side metallization. This configuration allows it to conduct surge current only when the protected line goes negative relative to ground - making it ideal for DC power rail protection where reverse polarity is not expected.

Can MPLAD18KP7.5A be used in RoHS-compliant manufacturing processes?

Yes, the MPLAD18KP7.5A is offered in RoHS-compliant version with e3 matte-tin plating, fully compatible with lead-free reflow soldering profiles up to 260°C for 10 seconds. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, meaning no dry-pack or baking is required prior to assembly - simplifying handling and reducing process risk in high-reliability production lines.