Microchip Technology SMDA05C-7E3/TR13

Overview

SMDA05C-7E3/TR13 from Diodes Incorporated is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 5.0 V standoff voltage (V_WM), and 9.8 V clamping voltage at 1 A. It protects up to 7 I/O lines in ESD-sensitive digital interfaces including USB, RS-485, and parallel bus transceivers.

For engineers reviewing the SMDA05C-7E3/TR13 datasheet, SMDA05C-7E3/TR13 pinout, SMDA05C-7E3/TR13 application, or SMDA05C-7E3/TR13 equivalent, key selection criteria include IEC 61000-4-2 ±15 kV contact/±20 kV air ESD rating, low 40 µA leakage at V_WM, and 200 pF line-to-line capacitance at 1 MHz - critical for high-speed data integrity in industrial and telecom interface protection.

Technical Context

This TVS array employs silicon avalanche diode technology with monolithic integration of seven identical bidirectional clamping cells in a single SO-8 package. Each channel provides symmetrical breakdown (V_BR min = 6.0 V, max = 7.0 V @ 1 mA) and fast response time (<1 ns) to ESD and EFT transients.

Designed for board-level surge suppression, it meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and secondary lightning surge standards. Its thermal design supports continuous operation from –55 °C to +150 °C, enabling use in automotive under-hood and industrial control environments.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm footprint, 1.75 mm max height, with 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 SMAJ5.0A and SP1003-050, the SMDA05C-7E3/TR13 delivers optimal balance of low clamping (9.8 V), tight V_WM tolerance (5.0 V), and integrated 7-line layout - making it ideal for space-constrained 5 V interface protection where ESD robustness and signal fidelity are co-prioritized.

Availability

SMDA05C-7E3/TR13 is available at Aetrix Electronics and suitable for industrial HMI interfaces, USB 2.0 peripheral ports, and RS-485 data links requiring stable component supply across multi-year production cycles.

Supply support for SMDA05C-7E3/TR13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions.

The SMDAxxC-7 series was developed specifically for board-level ESD/EFT protection of multi-line digital interfaces, emphasizing compact integration, IEC compliance, and thermal resilience in harsh environments.

FAQ

What is the clamping voltage of SMDA05C-7E3/TR13 at 5 A, and how does it impact circuit protection?

The clamping voltage of SMDA05C-7E3/TR13 is 11 V at 5 A (per Figure 2 in MSC0888.PDF). This value defines the maximum voltage seen by downstream components during high-current transients such as EFT bursts. At 11 V, the SMDA05C-7E3/TR13 ensures 5 V logic devices remain within their absolute maximum ratings, preventing destructive overvoltage stress on I/O structures while maintaining functional integrity during surge events.

Does SMDA05C-7E3/TR13 support IEC 61000-4-5 surge testing, and what level is validated?

SMDA05C-7E3/TR13 is rated for 300 W peak pulse power with an 8/20 µs waveform, which corresponds to IEC 61000-4-5 Level 3 (1 kV line-to-ground, 2 kV line-to-line) when applied through appropriate source impedance. While not explicitly tested to full IEC 61000-4-5 system-level requirements, its 300 W rating and SO-8 thermal mass provide validated protection against secondary lightning-induced surges in end-equipment designs using proper PCB layout and grounding.

How many independent protection channels does SMDA05C-7E3/TR13 provide, and how are they configured?

SMDA05C-7E3/TR13 provides seven independent bidirectional protection channels. These are implemented as four anode-cathode pairs (Pins 1–2, 3–4, 5–6, 7–8) plus a shared ground path via Pin 8. Each channel protects one signal line referenced to ground, enabling simultaneous safeguarding of up to seven I/O lines such as D+, D–, VBUS, ID, and auxiliary control signals in compact USB or serial interface layouts.

What is the temperature coefficient of breakdown voltage (αV_BR) for SMDA05C-7E3/TR13, and why does it matter?

The temperature coefficient of breakdown voltage (αV_BR) for SMDA05C-7E3/TR13 is +1 mV/°C, indicating a slight positive drift in V_BR with rising temperature. This characteristic ensures stable triggering behavior across the full –55 °C to +150 °C operating range: at high temperatures, the increased V_BR prevents premature clamping during normal operation, while at low temperatures, minimal reduction maintains reliable surge response without compromising protection margin.

Can SMDA05C-7E3/TR13 be used for protecting 3.3 V logic interfaces, and what is the risk?

SMDA05C-7E3/TR13 is not recommended for 3.3 V logic interfaces due to its 5.0 V standoff voltage (V_WM). Using it on 3.3 V rails risks false triggering during normal signal swings (e.g., 3.3 V ±10 %), leading to excessive leakage, signal distortion, or latch-up. For 3.3 V systems, the SMDA03C-7 variant (3.3 V V_WM) is the appropriate choice - the SMDA05C-7E3/TR13 must only be deployed where continuous operating voltage reaches or exceeds 5.0 V.