Microchip Technology SMDA03C-4E3/TR7

Overview

SMDA03C-4E3/TR7 from Microsemi (now Microchip Technology) is a 4-channel bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 3.3 V standoff voltage (V_WM), and clamping ≤7.0 V at 1 A. It protects I/O transceivers, microprocessors, and SRAM/DRAM interfaces against ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges.

For engineers reviewing the SMDA03C-4E3/TR7 datasheet, SMDA03C-4E3/TR7 pinout, SMDA03C-4E3/TR7 application, or SMDA03C-4E3/TR7 equivalent, key selection criteria include V_WM ≥ circuit operating voltage, low clamping voltage under 1–5 A surge current, SO-8 footprint compatibility, and sub-300 pF line capacitance for high-speed data lines.

Technical Context

This TVS array uses silicon avalanche diode technology with symmetrical bidirectional breakdown per channel, enabling protection of both polarities of AC-coupled or dual-rail signal lines without polarity constraints. Each of the four channels operates independently with matched V_BR (min 4.0 V, max not specified), temperature coefficient of −5 mV/°C, and leakage <200 µA at 3.3 V.

The device is optimized for board-level surge immunity: its 8/20 µs waveform response supports IEC 61000-4-4 compliance, while low dynamic impedance ensures rapid clamping during ESD events (±15 kV contact per IEC 61000-4-2). The SO-8 thermal design sustains operation from −55 °C to +150 °C.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm body, 1.75 mm max height, 1.27 mm pitch, pin #1 marked by dot. Molded plastic body with matte finish and laser-marked device code "REA" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMDA05C-4 and SMF03C-4, the SMDA03C-4E3/TR7 offers optimal balance of low-voltage compatibility, robust 300 W surge rating, and SO-8 manufacturability-making it preferred for 3.3 V industrial I/O where long-term reliability outweighs minimal size savings.

Availability

SMDA03C-4E3/TR7 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive infotainment subsystems, and medical device I/O protection requiring stable component supply across multi-year production cycles.

Supply support for SMDA03C-4E3/TR7 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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The SMDAxxC-4 series was developed to deliver cost-effective, board-level ESD/EFT protection for high-speed digital interfaces in harsh environments-emphasizing thermal robustness, repeatable clamping, and JEDEC-standard packaging.

FAQ

What is the standoff voltage (V_WM) specification for SMDA03C-4E3/TR7?

The SMDA03C-4E3/TR7 has a standoff voltage (V_WM) of 3.3 V, meaning it remains non-conductive up to this DC or peak AC voltage. This value is selected to match standard 3.3 V logic rails while providing margin above typical signal swings. Exceeding 3.3 V continuously may cause leakage increase or premature conduction, so system designers must verify that the protected line's maximum operating voltage does not surpass this rating.

Does SMDA03C-4E3/TR7 support IEC 61000-4-2 ESD testing?

Yes, the SMDA03C-4E3/TR7 is designed and characterized to meet IEC 61000-4-2 requirements for electrostatic discharge immunity, including ±15 kV contact discharge and ±25 kV air discharge. Its 300 W peak pulse power rating and low clamping voltage (≤7.0 V at 1 A) ensure protected circuits remain within safe operating limits during such events, as validated in Microsemi's application testing per the MSC0886.PDF datasheet.

How many independent protection channels does SMDA03C-4E3/TR7 provide?

The SMDA03C-4E3/TR7 provides four independent bidirectional TVS channels in a single SO-8 package. Pins 1–2 form Channel 1, pins 3–4 form Channel 2, pins 5–6 form Channel 3, and pins 7–8 form Channel 4. Each channel functions autonomously, allowing simultaneous protection of four separate data or control lines without crosstalk or shared impedance effects.

What is the maximum clamping voltage of SMDA03C-4E3/TR7 at 5 A surge current?

The SMDA03C-4E3/TR7 has a maximum clamping voltage (V_C) of 9.0 V at 5 A (8/20 µs waveform), as specified in the Electrical Characteristics table of the MSC0886.PDF datasheet. This value reflects worst-case voltage seen by downstream circuitry during high-current transients and is critical for ensuring protected ICs-such as 3.3 V microcontrollers or transceivers-remain below their absolute maximum input voltage ratings.

Is SMDA03C-4E3/TR7 compatible with lead-free reflow soldering processes?

Yes, the SMDA03C-4E3/TR7 is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its SO-8 package withstands peak temperatures up to 260 °C for 10 seconds, consistent with standard Pb-free assembly profiles. The device's −55 °C to +150 °C operating range and molded epoxy construction ensure mechanical and electrical integrity post-reflow, with no special pre-conditioning required.