Microchip Technology SMDA24C-5E3/TR7

Overview

SMDA24C-5E3/TR7 from Microsemi (now Microchip Technology) is a 5-line bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 24 V standoff voltage (V_WM), and clamping voltage of 43 V at 1 A. It protects I/O transceivers, microprocessors, and memory interfaces against ESD per IEC 61000-4-2, EFT per IEC 61000-4-4, and lightning-induced surges.

For engineers reviewing the SMDA24C-5E3/TR7 datasheet, SMDA24C-5E3/TR7 pinout, SMDA24C-5E3/TR7 application, or SMDA24C-5E3/TR7 equivalent, key selection criteria include V_WM ≥ circuit operating voltage, clamping performance under 1–5 A surge current, SO-8 footprint compatibility, and leakage current ≤1 µA at 24 V.

Technical Context

This TVS array integrates five identical bidirectional avalanche diode pairs in a single SO-8 package, with common ground connection on Pin 5 and no-connect (N.C.) terminals on Pins 2 and 4. Each line provides symmetrical clamping in both polarities without polarity dependence.

It operates across –55 °C to +150 °C, supports tape-and-reel packaging (EIA-481-1-A, 2500 pcs/reel), and exhibits 35 pF typical capacitance per line at 0 V and 1 MHz - optimized for high-speed data lines including RS-485, USB 2.0, and parallel I/O buses.

Key Specifications

Pinout & Package

SO-8 surface-mount package with gull-wing leads, 1.27 mm pitch, 4.9 mm × 6.0 mm body size, and pin 1 identified by dot marking. Weight: 0.066 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ24A-E3/5A and SP1003-02HTG, the SMDA24C-5E3/TR7 offers integrated 5-line protection in standard SO-8 with verified N.C. pin configuration, making it optimal for space-constrained industrial I/O designs where layout reuse and ESD robustness are prioritized over marginal capacitance reduction.

Availability

SMDA24C-5E3/TR7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 communication ports, and PLC digital I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SMDA24C-5E3/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-5 series was developed specifically for board-level ESD and surge protection of 24 V industrial control systems, emphasizing rugged SO-8 integration, wide temperature operation, and compliance with IEC 61000-4-x immunity standards.

FAQ

What is the standoff voltage rating of the SMDA24C-5E3/TR7?

The SMDA24C-5E3/TR7 has a standoff voltage (V_WM) of 24 V, meaning it remains non-conductive under continuous 24 V DC or peak AC conditions. This matches standard 24 V industrial control rails and ensures no leakage or power loss during normal operation. The SMDA24C-5E3/TR7 is designed so that V_WM equals the maximum steady-state voltage of the protected line - a key criterion for reliable transient suppression without false triggering.

Does the SMDA24C-5E3/TR7 support bidirectional transient suppression?

Yes, the SMDA24C-5E3/TR7 provides symmetrical bidirectional clamping on all five protected lines, enabling protection against both positive and negative transients such as ESD contact discharge or inductive kickback reversal. Each line uses a back-to-back diode configuration referenced to Pin 5 (GND), allowing it to suppress surges regardless of polarity - essential for AC-coupled or floating data buses like RS-485 or CAN physical layers.

What is the clamping voltage of the SMDA24C-5E3/TR7 at 5 A surge current?

The SMDA24C-5E3/TR7 clamps to a maximum of 55 V when subjected to a 5 A, 8/20 µs surge current, as specified in the MSC0331A.PDF datasheet. This value defines the upper voltage limit imposed on protected circuitry during high-current transients. Engineers use this figure to verify that downstream components - such as 3.3 V or 5 V logic buffers powered from 24 V rails - remain within absolute maximum ratings during worst-case surge events.

Can the SMDA24C-5E3/TR7 be used in automotive applications?

Yes, the SMDA24C-5E3/TR7 is qualified for operation from –55 °C to +150 °C and meets IEC 61000-4-2 and IEC 61000-4-4 immunity requirements - making it suitable for under-hood and body-control automotive applications. While not AEC-Q200 certified out-of-box, its thermal and surge performance aligns with secondary protection needs in LIN, sensor supply, and actuator drive circuits where system-level testing validates robustness.

How many protected lines does the SMDA24C-5E3/TR7 provide, and what is the pin configuration?

The SMDA24C-5E3/TR7 protects exactly five bidirectional signal lines using an SO-8 package with ground on Pin 5 and no-connect (N.C.) terminals on Pins 2 and 4. Pins 1, 3, 6, 7, and 8 serve as the five protected line terminals, each internally connected to a bidirectional TVS diode pair. This configuration is explicitly documented in the MSC0331A.PDF mounting diagram and circuit schematic - confirming the SMDA24C-5E3/TR7's validated 5-line architecture.