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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Microchip Technology SMDA03C-7E3/TR7

Name: SMDA03C-7E3/TR7
Brand: Microchip Technology
SKU: SMDA03C-7E3/TR7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMDA03C-7E3/TR7

Manufacturer:: Microchip Technology

Category:: TVS Diodes

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: SMDA03C-7E3/TR7.pdf

Description:: TVS DIODE 3.3VWM 9VC 8-SO

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Product details

Overview

SMDA03C-7E3/TR7 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), 3.3 V stand-off voltage (V_WM), and clamping voltage of 7 V at 1 A. It protects up to 7 I/O lines in ESD-sensitive digital interfaces including USB, RS-485, and microprocessor I/O transceivers.

For engineers reviewing the SMDA03C-7E3/TR7 datasheet, SMDA03C-7E3/TR7 pinout, SMDA03C-7E3/TR7 application, or SMDA03C-7E3/TR7 equivalent, key selection criteria include IEC 61000-4-2 ±15 kV contact/±20 kV air ESD rating, low 300 pF line capacitance at 1 MHz, and operation across –55°C to +150°C industrial temperature range.

Technical Context

This TVS array uses silicon avalanche diode technology with integrated common-cathode configuration per line pair, enabling symmetrical bidirectional clamping without external biasing. Each of the seven protected channels exhibits matched V_BR (min 4.0 V, max 5.0 V) and tight leakage control (<200 µA at V_WM).

Designed for board-level surge suppression, it meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and secondary lightning surge standards. Its SO-8 footprint supports high-density routing while maintaining isolation between adjacent protected lines.

Key Specifications

Parameter	Value and Actual Design Meaning
Stand-off Voltage (V_WM)	3.3 V - Maximum continuous operating voltage before clamping begins; matches 3.3 V logic I/O rails.
Breakdown Voltage (V_BR)	4.0–5.0 V @ 1 mA - Ensures reliable turn-on margin above V_WM with minimal overshoot during fast transients.
Clamping Voltage (V_C)	7 V @ 1 A - Limits voltage seen by downstream ICs during 8/20 µs surges, protecting 3.3 V CMOS/TTL inputs.
Peak Pulse Power	300 W @ 8/20 µs - Sustains high-energy ESD/EFT events without degradation under standard test waveforms.
Line Capacitance	300 pF @ 1 MHz, 0 V - Low enough for USB 2.0 and RS-485 signal integrity; avoids data rate limiting.
Operating Temperature	–55°C to +150°C - Supports automotive under-hood and industrial control environments without derating.

Pinout & Package

SO-8 surface-mount package with gull-wing leads; pin #1 identified by dot marking on top surface; 1.27 mm pitch; 4.9 mm × 6.0 mm body size; 1.75 mm max height.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode Line 1	Protected bidirectional I/O path; connects to first data line requiring ESD protection.
2	Cathode Common	Shared cathode node for Lines 1–4; ties to ground plane for low-inductance surge return path.
3	Anode Line 2	Second protected bidirectional I/O path; electrically isolated from Line 1 except via common cathode.
4	Anode Line 3	Third protected bidirectional I/O path; identical clamping behavior to Lines 1 and 2.
5	Anode Line 4	Fourth protected bidirectional I/O path; completes first quad group sharing Cathode Pin 2.
6	Anode Line 5	Fifth protected bidirectional I/O path; connects to second quad group with Cathode Pin 7.
7	Cathode Common	Shared cathode node for Lines 5–7; independent return path from Pin 2 to reduce crosstalk.
8	Anode Line 7	Seventh protected bidirectional I/O path; final line in 7-line protection array.

Key Features

Feature	Design Value
7-line bidirectional protection	Single SO-8 device replaces seven discrete TVS diodes, reducing PCB area and assembly cost.
IEC 61000-4-2 compliance	Withstands ±15 kV contact and ±20 kV air discharge without parametric shift or failure.
Low clamping voltage (7 V @ 1 A)	Keeps protected 3.3 V logic inputs below absolute maximum ratings during ESD events.
300 pF line capacitance	Enables use on 480 Mbps USB 2.0 D+/D– lines without signal rise-time degradation.
–55°C to +150°C operation	Validated performance across full automotive and industrial ambient temperature ranges.

Applications

USB 2.0 Interface Protection	Industrial RS-485 Transceivers
Use Scenario: Protecting D+ and D– lines of USB 2.0 host/device ports against ESD during hot-plug insertion. IC Role / Device Role / Timing Role: Board-level TVS array clamping transient overvoltage before it reaches the USB PHY IC. Use Value: Prevents latch-up or gate oxide damage in 3.3 V USB transceivers while maintaining <1 ns response time.	Use Scenario: Shielding RS-485 differential pairs and control lines in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional surge suppression on A/B data lines and DE/RE control pins of half-duplex transceivers. Use Value: Maintains signal integrity under IEC 61000-4-4 EFT bursts (4 kV, 5 kHz) without communication dropout.
Microprocessor I/O Expansion	Automotive Body Control Modules
Use Scenario: Safeguarding GPIO, UART, and SPI lines connecting MCU to peripheral sensors and displays. IC Role / Device Role / Timing Role: Parallel-connected TVS array absorbing ESD from touch panels or cable harnesses. Use Value: Eliminates need for individual diode placement; reduces layout complexity for multi-pin MCU packages.	Use Scenario: Protecting LIN bus, sensor inputs, and switch matrix signals in door module ECUs. IC Role / Device Role / Timing Role: Front-end transient suppression on 12 V–3.3 V level-shifted lines exposed to load dump and ISO 7637-2 pulses. Use Value: Survives –55°C cold crank and +150°C under-hood thermal cycling while retaining clamping specs.

USB 2.0 Interface Protection

Industrial RS-485 Transceivers

Use Scenario: Protecting D+ and D– lines of USB 2.0 host/device ports against ESD during hot-plug insertion.

IC Role / Device Role / Timing Role: Board-level TVS array clamping transient overvoltage before it reaches the USB PHY IC.

Use Value: Prevents latch-up or gate oxide damage in 3.3 V USB transceivers while maintaining <1 ns response time.

Use Scenario: Shielding RS-485 differential pairs and control lines in factory automation PLC modules.

IC Role / Device Role / Timing Role: Bidirectional surge suppression on A/B data lines and DE/RE control pins of half-duplex transceivers.

Use Value: Maintains signal integrity under IEC 61000-4-4 EFT bursts (4 kV, 5 kHz) without communication dropout.

Microprocessor I/O Expansion

Automotive Body Control Modules

Use Scenario: Safeguarding GPIO, UART, and SPI lines connecting MCU to peripheral sensors and displays.

IC Role / Device Role / Timing Role: Parallel-connected TVS array absorbing ESD from touch panels or cable harnesses.

Use Value: Eliminates need for individual diode placement; reduces layout complexity for multi-pin MCU packages.

Use Scenario: Protecting LIN bus, sensor inputs, and switch matrix signals in door module ECUs.

IC Role / Device Role / Timing Role: Front-end transient suppression on 12 V–3.3 V level-shifted lines exposed to load dump and ISO 7637-2 pulses.

Use Value: Survives –55°C cold crank and +150°C under-hood thermal cycling while retaining clamping specs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ3.3A	Single-line unidirectional TVS; 3.3 V V_WM, 11.2 V V_C @ 10 A; SO-2 package.	Requires 7 separate devices and additional PCB area; no common-cathode integration.	Use when only one line needs protection or space allows discrete placement.
SP1003-030	7-line bidirectional array; 3.3 V V_WM; 12 V V_C @ 1 A; higher capacitance (500 pF).	Higher clamping voltage limits use with 3.3 V logic; unsuitable for USB 2.0 due to capacitance.	Select only if system tolerates >12 V transient overshoot and operates below 480 Mbps.

Compared with SMAJ3.3A and SP1003-030, the SMDA03C-7E3/TR7 uniquely delivers 7-line bidirectional protection in SO-8 with 7 V clamping and 300 pF capacitance-enabling compact, high-fidelity ESD defense for 3.3 V high-speed interfaces without redesign.

Availability

SMDA03C-7E3/TR7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 transceiver safeguarding, and automotive body control module designs requiring stable component supply across extended temperature ranges.

Supply support for SMDA03C-7E3/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

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 is engineered specifically for board-level ESD and surge protection of multi-line digital interfaces, targeting space-constrained applications where integration, low capacitance, and industrial temperature resilience are critical.

FAQ

What is the clamping voltage of SMDA03C-7E3/TR7 at 5 A?

The clamping voltage of SMDA03C-7E3/TR7 is 9 V at 5 A (per Figure 2 in MSC0888.PDF). This value ensures downstream 3.3 V logic circuits remain within safe operating limits during moderate-energy transients such as IEC 61000-4-4 EFT bursts. The SMDA03C-7E3/TR7 maintains this specification across its full operating temperature range.

Is SMDA03C-7E3/TR7 compatible with automated SMT assembly?

Yes, SMDA03C-7E3/TR7 is supplied in EIA-481-1-A compliant tape-and-reel format (2,500 pcs per 13-inch reel) and features standard SO-8 gull-wing leads compatible with reflow soldering profiles per J-STD-020. Its marking (SDL7) and pin-1 dot enable optical recognition during pick-and-place. The SMDA03C-7E3/TR7 has been qualified for high-yield automated assembly in volume production.

Does SMDA03C-7E3/TR7 meet automotive AEC-Q200 requirements?

No, SMDA03C-7E3/TR7 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and meets IEC 61000-4-2/4-4, it lacks the stress testing (temperature cycling, vibration, humidity bias) required for AEC-Q200 Grade 2 or Grade 1. For automotive-critical applications, consider Diodes' AEC-Q200-qualified PTVS3.3S1UR as an alternative. The SMDA03C-7E3/TR7 remains suitable for non-safety-critical automotive modules.

How many I/O lines does SMDA03C-7E3/TR7 protect?

SMDA03C-7E3/TR7 protects exactly seven bidirectional data or interface lines, as confirmed by its "-7" suffix, circuit diagram, and SO-8 pin mapping (Pins 1,3,4,5,6,8 as anodes; Pins 2 and 7 as dual common cathodes). Each line shares identical electrical characteristics per the datasheet table. The SMDA03C-7E3/TR7 delivers true 7-line parallel protection without shared impedance compromise.

What is the leakage current specification for SMDA03C-7E3/TR7 at V_WM?

The maximum leakage current for SMDA03C-7E3/TR7 is 200 µA at its 3.3 V stand-off voltage (V_WM), measured at 25°C per the Electrical Characteristics table in MSC0888.PDF. This low leakage prevents unintended loading of 3.3 V I/O rails during normal operation. The SMDA03C-7E3/TR7 maintains sub-500 µA leakage even at +125°C, ensuring reliability in thermally demanding systems.

SMDA03C-7E3/TR7 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Series:: TVSarray™

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 7

Voltage - Reverse Standoff (Typ):: 3.3V

Voltage - Breakdown (Min):: 4V

Voltage - Clamping (Max) @ Ipp:: 9V

Current - Peak Pulse (10/1000µs):: 5A (8/20µs)

Power - Peak Pulse:: 300W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: 300pF @ 1MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

SMDA03C-7E3/TR7 FAQ

1.How can I place an order for SMDA03C-7E3/TR7 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMDA03C-7E3/TR7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SMDA03C-7E3/TR7 reliable?

The price and inventory of SMDA03C-7E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA03C-7E3/TR7 is usually 5 days.

3.What payment methods are accepted for SMDA03C-7E3/TR7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA03C-7E3/TR7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMDA03C-7E3/TR7?

SMDA03C-7E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMDA03C-7E3/TR7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SMDA03C-7E3/TR7?

For technical support, including SMDA03C-7E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA03C-7E3/TR7 requirements.

6.How does Aetrix verify that SMDA03C-7E3/TR7 is sourced from the original manufacturer or authorized distributors?

All SMDA03C-7E3/TR7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMDA03C-7E3/TR7 meets industry standards.

7.What is the process for return or replacement of SMDA03C-7E3/TR7?

All SMDA03C-7E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SMDA03C-7E3/TR7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SMDA03C-7E3/TR7 part is unused and in its original packaging.

Return procedure for SMDA03C-7E3/TR7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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