Microchip Technology SMDA15-6E3/TR13

Overview

SMDA15-6E3/TR13 from Microsemi (now Microchip Technology) is a unidirectional transient voltage suppressor (TVS) array in SO-8 package, designed for board-level ESD and EFT protection of six I/O lines. It features 15 V standoff voltage (V_WM), 16.7 V minimum breakdown voltage (V_BR), 24 V clamping voltage at 1 A, 300 W peak pulse power (8/20 µs), and 140 pF line capacitance - ideal for safeguarding CMOS, HCMOS, and I/O transceivers in industrial control interfaces.

For engineers reviewing the SMDA15-6E3/TR13 datasheet, SMDA15-6E3/TR13 pinout, SMDA15-6E3/TR13 application, or SMDA15-6E3/TR13 equivalent, key selection criteria include standoff voltage matching circuit operating voltage, clamping performance under 1–5 A surge, IEC 61000-4-2/4-4 compliance, SO-8 thermal and layout compatibility, and low-line capacitance for high-speed data integrity.

Technical Context

This TVS array implements six independent unidirectional avalanche diode junctions in a single SO-8 package, each configured as a cathode-to-rail clamp to ground. Its architecture delivers fast response (<1 ns) to ESD events per IEC 61000-4-2 Level 4 (±15 kV contact), with defined clamping behavior up to 5 A per line and thermal stability across –55°C to +150°C.

The device operates with zero bias on protected lines during normal operation, drawing only ≤1 µA leakage at 15 V standoff. Its 140 pF capacitance per line (measured at 1 MHz, 0 V) supports signal integrity in sub-25 Mbps digital interfaces such as RS-232, RS-485, and parallel I/O buses without significant rise-time degradation.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), molded plastic body, 0.150" width, 1.27 mm pitch, pin #1 marked by dot on top surface. 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 SMDA15-6/TR7, the SMDA15-6E3/TR13 offers identical protection performance with optimized logistics for high-volume manufacturing; versus SMCJ15A, it delivers superior layout efficiency and lower ground-loop impedance but requires verification of SO-8 pad stack compatibility in legacy designs.

Availability

SMDA15-6E3/TR13 is available at Aetrix Electronics and suitable for industrial serial interface protection, automotive body control modules, medical diagnostic front panels, and point-of-sale terminal interfaces requiring stable component supply and long-term obsolescence management.

Supply support for SMDA15-6E3/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

Microsemi Corporation (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 SMDAxx-6 TVS array product line was engineered specifically for compact, multi-line board-level ESD/EFT hardening in space-constrained embedded systems - prioritizing low capacitance, repeatable clamping, and extended temperature resilience over cost-optimized consumer-grade alternatives.

FAQ

What is the standoff voltage rating of the SMDA15-6E3/TR13?

The SMDA15-6E3/TR13 has a standoff voltage (V_WM) of 15.0 V, meaning it remains non-conductive under continuous DC or RMS voltages up to this level. This value matches typical 12 V nominal industrial bus systems and provides margin above 13.8 V automotive battery rails. The SMDA15-6E3/TR13 is not intended for circuits operating above 15 V without risk of premature conduction.

Does the SMDA15-6E3/TR13 meet IEC 61000-4-2 ESD immunity standards?

Yes, the SMDA15-6E3/TR13 is characterized to suppress ±15 kV contact and ±20 kV air discharge per IEC 61000-4-2. Its 24 V clamping voltage at 1 A ensures downstream logic ICs (e.g., SN65HVD7x transceivers) remain below absolute maximum ratings during ESD events. The SMDA15-6E3/TR13 achieves this without external components or layout dependencies beyond proper ground plane design.

How many protected lines does the SMDA15-6E3/TR13 support, and how are they arranged?

The SMDA15-6E3/TR13 protects exactly six unidirectional signal lines, each with its own avalanche diode junction tied to common ground. Pin configuration alternates between I/O anodes and dual GND terminals (Pins 1,3,5,6,7,8 = I/O; Pins 2 and 4 = GND). This arrangement minimizes ground inductance during simultaneous multi-line surges and is documented in the MSC0332A.PDF datasheet Figure "CIRCUIT DIAGRAM".

What is the line-to-line capacitance of the SMDA15-6E3/TR13, and why does it matter?

The SMDA15-6E3/TR13 exhibits 140 pF capacitance per line at 1 MHz and 0 V bias. This value directly affects signal integrity on high-speed digital interfaces: lower capacitance preserves rise/fall times and reduces crosstalk. For example, on a 25 Mbps RS-485 link, 140 pF adds <0.5 ns delay skew - well within spec for TIA/EIA-485-A compliance. The SMDA15-6E3/TR13's capacitance is measured and guaranteed per line, not total package.

Is the SMDA15-6E3/TR13 compatible with lead-free reflow soldering processes?

Yes, the SMDA15-6E3/TR13 is qualified for lead-free reflow per JEDEC J-STD-020 Rev E, with peak temperature tolerance up to 260°C for 30 seconds. Its SO-8 package uses matte tin (Sn) plating and passes thermal cycling (–55°C to +150°C, 1000 cycles) and moisture sensitivity level 1 (MSL-1) requirements. The SMDA15-6E3/TR13's marking "E3" denotes lead-free finish per Microsemi specification.