Microchip Technology SMDA15C-4E3/TR7

Overview

SMDA15C-4E3/TR7 from Microsemi (now Microchip Technology) is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 15 V standoff voltage (V_WM), and clamping ≤30 V at 5 A. It protects four I/O lines in industrial interface circuits against ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges.

For engineers reviewing the SMDA15C-4E3/TR7 datasheet, SMDA15C-4E3/TR7 pinout, SMDA15C-4E3/TR7 application, or SMDA15C-4E3/TR7 equivalent, key selection criteria include V_WM ≥ circuit operating voltage, clamping performance under 5 A surge, SO-8 board-level mounting compatibility, and IEC-compliant transient immunity for serial bus protection.

Technical Context

This TVS array employs silicon avalanche diode technology with symmetrical bidirectional breakdown per channel, enabling protection of AC-coupled or differential data lines without polarity constraints. Each of its four channels operates independently with matched V_BR (16.7 V min) and low leakage (<1 µA at 15 V).

Designed for board-level surge suppression, it integrates four identical TVS elements in a single SO-8 footprint, eliminating discrete placement and routing complexity while maintaining <140 pF line-to-line capacitance at 1 MHz - critical for high-speed RS-485, CAN, and USB 2.0 signal integrity.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm body, 1.27 mm pitch, 1.75 mm max height. Pin #1 identified by dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ15A and SP1003-010, the SMDA15C-4E3/TR7 uniquely balances 15 V standoff, 300 W surge capability, and 4-channel integration in SO-8 - making it optimal for 12–24 V industrial data links requiring compact, standards-compliant board-level protection.

Availability

SMDA15C-4E3/TR7 is available at Aetrix Electronics and suitable for industrial communications, automotive body electronics, and medical device interfaces requiring stable component supply and long-term obsolescence management.

Supply support for SMDA15C-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 specifically for compact, multi-line board-level ESD and surge protection in space-constrained industrial and automotive control units - emphasizing IEC/ISO compliance, thermal robustness, and SO-8 manufacturability.

FAQ

What is the standoff voltage rating of the SMDA15C-4E3/TR7?

The SMDA15C-4E3/TR7 has a standoff voltage (V_WM) of 15 V, meaning it remains non-conductive under continuous DC or RMS voltages up to this level. This rating ensures compatibility with 12 V nominal industrial buses and 15 V analog sensor outputs while providing margin against ripple and tolerance drift. The SMDA15C-4E3/TR7 is designed to begin clamping only when transients exceed its specified breakdown threshold.

Does the SMDA15C-4E3/TR7 meet IEC 61000-4-2 ESD immunity requirements?

Yes, the SMDA15C-4E3/TR7 is characterized to meet IEC 61000-4-2 Level 4 (±15 kV contact, ±20 kV air discharge). Its 300 W peak pulse power rating and sub-30 V clamping at 5 A ensure reliable suppression of ESD events without damaging downstream transceivers. The SMDA15C-4E3/TR7 achieves this through matched silicon avalanche junctions in a monolithic SO-8 array.

How many protected lines does the SMDA15C-4E3/TR7 support?

The SMDA15C-4E3/TR7 provides protection for four independent bidirectional data or interface lines using a single SO-8 package. Internal circuitry configures pins 1–2, 2–3, 3–4, and 4–5 as four separate TVS paths, each sharing common cathode connections on pins 5–8. This architecture eliminates discrete part count and routing complexity in the SMDA15C-4E3/TR7 implementation.

What is the maximum clamping voltage of the SMDA15C-4E3/TR7 at 5 A?

The SMDA15C-4E3/TR7 exhibits a maximum clamping voltage (V_C) of 30 V when subjected to a 5 A transient current (8/20 µs waveform), as specified in the MSC0886.PDF datasheet. This value defines the upper voltage limit imposed on protected circuitry during surge events. The SMDA15C-4E3/TR7 maintains this performance across its full −55 °C to +150 °C operating range.

Is the SMDA15C-4E3/TR7 suitable for high-speed data lines?

Yes, the SMDA15C-4E3/TR7 offers 140 pF typical capacitance per line at 1 MHz and 0 V bias, making it suitable for data rates up to 10 Mbps on RS-485 or LIN buses. Its low capacitance minimizes signal rise-time degradation and reflection. For USB 2.0 or CAN FD, verify system-level eye diagram integrity - the SMDA15C-4E3/TR7's capacitance and clamping response support these interfaces when placed at board edges.