Microchip Technology MDA3KP22A

Overview

MDA3KP22A from Microsemi is a unidirectional 3000 W surface-mount transient voltage suppressor (TVS) array designed for high-reliability secondary lightning and ESD protection in power rails and signal lines. It features a 22 V reverse standoff voltage (VWM), 24.4–26.9 V breakdown voltage (V(BR)), 35.5 V maximum clamping voltage at 84.4 A peak pulse current, and operates from −55 °C to +150 °C - used in telecom power supplies and industrial motor drives.

For engineers reviewing the MDA3KP22A datasheet, MDA3KP22A pinout, MDA3KP22A application, or MDA3KP22A equivalent, key selection criteria include clamping performance under 10/1000 µs surge, standoff voltage margin versus system DC rail, thermal derating above 25 °C, and RoHS-compliant matte-tin termination compatibility with lead-free reflow.

Technical Context

The MDA3KP22A is a single-channel, unidirectional TVS diode optimized for fast transient suppression in DC power distribution networks. Its sub-100 ps response time enables effective ESD (IEC61000-4-2) and EFT (IEC61000-4-4) mitigation, while its 3000 W peak pulse power rating at 10/1000 µs supports IEC61000-4-5 Class 1–4 secondary lightning protection with 42 Ω, 12 Ω, or 2 Ω source impedances.

It uses a void-free thermosetting epoxy package rated UL94V-0, with tin-lead or annealed matte-tin plating per MIL-STD-750 Method 2026. Polarity is defined by dot marking; odd-numbered pins are cathodes - consistent across the MDA3KPxxA series.

Key Specifications

Pinout & Package

MDA3KP22A is housed in a vertically mounted, transfer-molded plastic package (case outline per RF01243 Page 6) with two terminals: Pin 1 (cathode) and Pin 2 (anode). The dot-marked top surface identifies Pin 1. Package dimensions: 21.03–22.05 mm length × 6.86–7.87 mm width × 8.64–9.65 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ22A and SMCJ22A, the MDA3KP22A delivers 2× and 2× higher peak pulse power respectively, enabling compliance with stringent secondary lightning standards (IEC61000-4-5 Class 4) and supporting longer surge duration without thermal runaway - critical for mission-critical infrastructure.

Availability

MDA3KP22A is available at Aetrix Electronics and suitable for telecom power systems, industrial PLCs, motor drive controls, and renewable energy inverters requiring stable component supply and long-term lifecycle support.

Supply support for MDA3KP22A 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 MDA3KPxxA series was developed for high-energy transient suppression in defense, aerospace, and industrial systems where MIL-PRF-19500 screening, lot traceability, and guaranteed 3000 W surge capability are mandatory design requirements.

FAQ

What is the clamping voltage of MDA3KP22A at its rated peak pulse current?

The MDA3KP22A has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current (IPP) of 84.4 A under 10/1000 µs waveform conditions. This value is measured per standard test methods in the RF01243 datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Designers use this parameter to verify that downstream components remain within their absolute maximum voltage ratings when MDA3KP22A is active.

Is MDA3KP22A RoHS compliant and what plating does it use?

Yes, MDA3KP22A is RoHS compliant (designated by "e3" suffix in part marking) and uses annealed matte-tin plating on its terminals, qualified per MIL-STD-750 Method 2026. This plating ensures excellent solderability in lead-free reflow processes up to 260 °C for 10 seconds, with no degradation in surge performance or intermetallic formation. The RoHS compliance status is confirmed in the "Part Nomenclature" section of the RF01243 datasheet.

How does MDA3KP22A differ from bidirectional variants like MDA3KP22CA?

MDA3KP22A is unidirectional and protects only positive-going transients on a DC line referenced to ground, whereas MDA3KP22CA is bidirectional and suppresses both polarities - suitable for AC lines or data lines with no fixed DC bias. The MDA3KP22A exhibits forward clamping behavior below 0 V (not specified in datasheet), while MDA3KP22CA provides symmetric clamping. Selection depends strictly on signal polarity and grounding architecture - MDA3KP22A is preferred for 24 V/48 V DC power rails.

What is the standoff voltage margin between MDA3KP22A and a typical 24 V DC system?

The MDA3KP22A has a 22 V rated working standoff voltage (VWM), providing a 2 V margin above nominal 24 V DC systems when accounting for tolerance and ripple. Per Microsemi guidance, VWM should equal or exceed peak operating voltage - so MDA3KP22A is appropriate for 24 V systems with ≤22 V peak, while MDA3KP24A (24 V VWM) is recommended for systems with tighter regulation or higher transient overshoot. This margin prevents leakage-induced heating during normal operation.

Does MDA3KP22A require derating at elevated ambient temperatures?

Yes, MDA3KP22A requires thermal derating above 25 °C ambient, as shown in Figure 3 of the RF01243 datasheet. At 100 °C ambient, its peak pulse power drops to ~65% of the 3000 W rating. Designers must apply this curve when placing MDA3KP22A near heat sources (e.g., power inductors or IGBTs) or in sealed enclosures. The 150 °C max junction temperature allows operation in high-temp environments, but sustained surges at elevated ambient require reduced duty cycle or parallel devices.