Microchip Technology MXDA3KP7.5CA

Overview

MXDA3KP7.5CA from Microsemi is a bidirectional 3000 W transient voltage suppressor (TVS) array designed for high-reliability surge protection in industrial and telecom power rails. It features a 7.5 V reverse standoff voltage (VWM), 8.33–9.21 V breakdown voltage (V(BR)), 12.9 V maximum clamping voltage at 100 A peak pulse current, and operates across –55 °C to +150 °C junction temperature.

For engineers reviewing the MXDA3KP7.5CA datasheet, MXDA3KP7.5CA pinout, MXDA3KP7.5CA application, or MXDA3KP7.5CA equivalent, key selection criteria include bidirectional IEC61000-4-5 Class 1–4 secondary lightning compliance (with 2–42 Ω source impedance), 100 ps response time, RoHS-compliant e3 matte-tin plating, and surface-mount vertical package with defined Pin 1 dot marking.

Technical Context

The MXDA3KP7.5CA implements a silicon avalanche diode structure optimized for fast clamping of high-energy transients. Its bidirectional configuration enables symmetrical suppression of both positive and negative polarity surges without external polarity management, supporting dual-rail or AC-coupled signal line protection.

It delivers 3000 W peak pulse power per IEC 61000-4-5 10/1000 µs waveform, with clamping validated at 12.9 V @ 100 A IPP and standby leakage ≤100 µA at 7.5 V VWM. Temperature derating follows Figure 3, maintaining ≥80% power rating up to +100 °C ambient.

Key Specifications

Pinout & Package

MXDA3KP7.5CA uses a 2-pin surface-mount vertical package (case outline per RF01243, Page 6). Pin 1 is cathode for each TVS element and marked by a dot on the top surface; polarity is defined per "Odd number pins are cathodes" rule. The thermosetting epoxy body meets UL94V-0 and weighs ~5 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.5CA and SMCJ7.5CA, MXDA3KP7.5CA provides double the surge power handling of SMCJ7.5CA and five times that of SMBJ7.5CA-enabling robust Class 4 secondary lightning protection in mission-critical infrastructure where failure risk must be minimized.

Availability

MXDA3KP7.5CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeds, automotive body control modules, and medical imaging power supplies requiring stable component supply and long-term lifecycle support.

Supply support for MXDA3KP7.5CA 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 and mixed-signal ICs, radiation-hardened devices, and discrete protection components.

The MDA3KP series was developed for demanding surge protection applications in aerospace, defense, and industrial systems where MIL-PRF-19500 screening, wide temperature operation, and guaranteed 3000 W pulse handling are mandatory.

FAQ

What is the clamping voltage of MXDA3KP7.5CA at its rated peak pulse current?

The MXDA3KP7.5CA has a maximum clamping voltage (VC) of 12.9 V at 100 A peak pulse current (IPP) under 10/1000 µs waveform conditions. This value is measured per Figure 2 in RF01243 Rev B and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The low clamping ensures compatibility with 3.3 V and 5 V logic interfaces downstream.

Is MXDA3KP7.5CA RoHS compliant, and what plating does it use?

Yes, MXDA3KP7.5CA is RoHS compliant, indicated by the "e3" suffix in its full part marking per RF01243 Rev B Page 2. It uses annealed matte-tin plating on terminals, which meets MIL-STD-750 Method 2026 for solderability and ensures reliable reflow performance without lead-based alloys. This plating also supports high-reliability assembly in aerospace and medical applications.

How does the bidirectional configuration of MXDA3KP7.5CA affect its circuit placement?

The bidirectional configuration of MXDA3KP7.5CA allows it to be placed directly across any two nodes-such as power-to-ground, signal-to-signal, or AC line-to-line-without regard to polarity. Unlike unidirectional TVS devices, MXDA3KP7.5CA clamps both positive and negative transients symmetrically, eliminating the need for orientation checks during PCB layout and simplifying design reuse across differential or floating systems.

What IEC standards does MXDA3KP7.5CA meet for surge immunity testing?

MXDA3KP7.5CA meets IEC61000-4-2 (ESD), IEC61000-4-4 (EFT), and IEC61000-4-5 (surge) standards. Specifically, it supports IEC61000-4-5 Class 1–4 secondary lightning protection depending on source impedance: Class 4 with 2 Ω, Class 1–3 with 12 Ω, and Class 1–4 with 42 Ω. These ratings are explicitly listed in the Applications/Benefits section of RF01243 Rev B Page 1.

Does MXDA3KP7.5CA require derating at elevated temperatures, and if so, how much?

Yes, MXDA3KP7.5CA requires thermal derating above 25 °C ambient. Per Figure 3 in RF01243 Rev B Page 5, its peak pulse power drops to 80% at +100 °C and 50% at +125 °C. Designers must apply this curve when sizing for sustained high-temperature environments such as under-hood automotive or enclosed industrial enclosures to ensure the device maintains ≥12.9 V clamping performance throughout its operating life.