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

Microchip Technology SMDA24-6E3/TR7

Name: SMDA24-6E3/TR7
Brand: Microchip Technology
SKU: SMDA24-6E3/TR7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMDA24-6E3/TR7

Manufacturer:: Microchip Technology

Category:: TVS Diodes

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

Datasheet:: SMDA24-6E3/TR7.pdf

Description:: TVS DIODE 24VWM 55VC 8-SO

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Product details

Overview

SMDA24-6E3/TR7 from Microsemi (now Microchip Technology) is a unidirectional 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 six I/O lines in industrial interface circuits against ESD per IEC 61000-4-2 (±15 kV contact), EFT per IEC 61000-4-4, and lightning-induced surges.

For engineers reviewing the SMDA24-6E3/TR7 datasheet, SMDA24-6E3/TR7 pinout, SMDA24-6E3/TR7 application, or SMDA24-6E3/TR7 equivalent, key selection criteria include verified 24 V operating margin, sub-1 µA leakage at V_WM, 88 pF line capacitance at 0 V, SO-8 thermal robustness to +150 °C, and board-level placement compatibility with standard I/O transceivers.

Technical Context

This TVS array implements six independent unidirectional avalanche diode junctions in a single SO-8 monolithic structure, each configured as a cathode-to-rail clamp with common GND terminals (Pins 3 & 6). It operates without biasing and responds within <1 ns to transients exceeding V_BR = 26.7 V (min).

The device meets IEC 61000-4-2 Level 4 (±15 kV contact, ±25 kV air) and IEC 61000-4-4 (40 A, 5/50 ns), with clamping performance validated at 43 V @ 1 A and 55 V @ 5 A per line - critical for preserving signal integrity in 24 V industrial control I/O stages.

Key Specifications

Parameter	Value and Actual Design Meaning
Standoff Voltage (V_WM)	24 V - Maximum continuous DC or RMS operating voltage before conduction begins; matches 24 V industrial bus levels.
Breakdown Voltage (V_BR)	26.7 V min @ 1 mA - Ensures reliable triggering above normal operating margin without false trips.
Clamping Voltage (V_C)	43 V @ 1 A - Limits transient overvoltage to safe level for 24 V logic and transceiver inputs.
Peak Pulse Power	300 W @ 8/20 µs - Sustains high-energy surges typical of industrial EFT and secondary lightning events.
Leakage Current (I_D)	≤1 µA @ 24 V - Prevents signal loading or power drain on protected 24 V data lines.
Capacitance (C)	88 pF @ 0 V, 1 MHz - Low enough to avoid distortion in RS-485, CAN, or digital I/O up to ~10 Mbps.
Operating Temperature	−55 °C to +150 °C - Supports deployment in under-hood automotive ECUs and factory-floor PLC modules.

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm footprint, 1.75 mm max height, gull-wing leads, pin #1 marked by dot. Thermal pad not present; solderable terminations only.

Pin/Terminal	Circuit Role	Design Meaning
1	I/O Line 1 Anode	Unidirectional surge path to GND; connects to protected signal trace (e.g., RS-485 A).
2	I/O Line 2 Anode	Independent clamp for second data line; no internal coupling between lines.
3	GND	Common cathode return for Lines 1–3; must be low-inductance PCB plane connection.
4	I/O Line 3 Anode	Third protected line; shares GND with Pins 3 & 6 only - no internal series impedance.
5	I/O Line 4 Anode	Fourth independent clamp; electrically isolated from other anodes except via shared GND.
6	GND	Second GND terminal for Lines 4–6; reduces ground loop inductance across all six lines.
7	I/O Line 5 Anode	Fifth protected line; layout symmetry enables balanced routing for differential pairs.
8	I/O Line 6 Anode	Sixth and final clamp; full 6-line protection without external components or routing splits.

Key Features

Feature	Design Value
6-line unidirectional protection	Single SO-8 device replaces six discrete TVS diodes, reducing PCB area by >70% and assembly cost.
IEC 61000-4-2/4-4 compliance	Validated ±15 kV contact ESD and 40 A EFT immunity - eliminates need for system-level retesting.
88 pF line capacitance	Enables use on 24 V CAN FD (5 Mbps) and RS-485 (12 Mbps) interfaces without signal rise-time degradation.
−55 °C to +150 °C operation	Supports extended-temperature applications including motor drive I/O and railway signaling modules.
SO-8 tape-and-reel packaging	EIA-481-1-A compliant reel (2500 pcs) enables automated pick-and-place with standard feeders.

Applications

Industrial RS-485 Networks	24 V CAN Bus Nodes
Use Scenario: Protection of half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLC backplanes exposed to cable discharge and ground potential differences. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping A/B differential lines and RE/DE control pins to GND during fast transients. Use Value: Maintains signal fidelity with ≤88 pF loading while limiting surge voltage to 43 V - below RS-485 receiver absolute maximum rating (±12 V common-mode + 24 V supply margin).	Use Scenario: Board-level surge suppression for 24 V-powered CAN FD nodes in commercial vehicle body control modules subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Six-line clamp protecting CAN_H, CAN_L, V_IO, EN, STB, and GND-referenced sense lines from coupled transients. Use Value: 300 W peak power rating absorbs 5/50 ns EFT bursts without degradation; 24 V V_WM ensures no conduction during 24 V nominal operation.
Programmable Logic Controller I/O	Industrial Ethernet PHY Interfaces
Use Scenario: Input/output protection for 24 V digital I/O cards in modular PLC chassis where field wiring induces ESD and inductive kickback. IC Role / Device Role / Timing Role: Per-channel TVS on sink/source transistor outputs and optocoupler inputs, referenced to local GND planes. Use Value: Sub-1 µA leakage prevents false triggering of 24 V sinking inputs; 150 °C rating supports convection-cooled enclosures.	Use Scenario: Transient suppression on MDI/MDIX pairs and management pins (e.g., INT#, RESET) of 10/100BASE-TX PHYs in industrial switches. IC Role / Device Role / Timing Role: Clamping Ethernet differential pairs and auxiliary control lines to GND using dedicated anodes per line. Use Value: 88 pF capacitance avoids skew between TX+/TX−; 43 V clamping preserves PHY's 3.3 V core and 24 V auxiliary rail integrity.

Industrial RS-485 Networks

24 V CAN Bus Nodes

Use Scenario: Protection of half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLC backplanes exposed to cable discharge and ground potential differences.

IC Role / Device Role / Timing Role: Unidirectional TVS array clamping A/B differential lines and RE/DE control pins to GND during fast transients.

Use Value: Maintains signal fidelity with ≤88 pF loading while limiting surge voltage to 43 V - below RS-485 receiver absolute maximum rating (±12 V common-mode + 24 V supply margin).

Use Scenario: Board-level surge suppression for 24 V-powered CAN FD nodes in commercial vehicle body control modules subject to load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Six-line clamp protecting CAN_H, CAN_L, V_IO, EN, STB, and GND-referenced sense lines from coupled transients.

Use Value: 300 W peak power rating absorbs 5/50 ns EFT bursts without degradation; 24 V V_WM ensures no conduction during 24 V nominal operation.

Programmable Logic Controller I/O

Industrial Ethernet PHY Interfaces

Use Scenario: Input/output protection for 24 V digital I/O cards in modular PLC chassis where field wiring induces ESD and inductive kickback.

IC Role / Device Role / Timing Role: Per-channel TVS on sink/source transistor outputs and optocoupler inputs, referenced to local GND planes.

Use Value: Sub-1 µA leakage prevents false triggering of 24 V sinking inputs; 150 °C rating supports convection-cooled enclosures.

Use Scenario: Transient suppression on MDI/MDIX pairs and management pins (e.g., INT#, RESET) of 10/100BASE-TX PHYs in industrial switches.

IC Role / Device Role / Timing Role: Clamping Ethernet differential pairs and auxiliary control lines to GND using dedicated anodes per line.

Use Value: 88 pF capacitance avoids skew between TX+/TX−; 43 V clamping preserves PHY's 3.3 V core and 24 V auxiliary rail integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ24A	Single-line SMA package; 400 W peak power; 38.9 V clamping @ 1 A; 150 pF capacitance.	Requires six discrete placements; higher capacitance limits use on >5 Mbps interfaces.	Choose when board space allows discrete layout and higher clamping voltage is acceptable.
SP1003-02HTG	6-line unidirectional SO-8; 350 W peak power; 40 V clamping @ 1 A; 12 pF capacitance; IEC 61000-4-2 ±30 kV.	Lower capacitance enables USB 2.0 or LVDS protection; tighter clamping improves margin for 3.3 V logic.	Choose when protecting mixed-voltage systems (e.g., 24 V power + 3.3 V data) with stricter ESD requirements.

Compared with SMAJ24A and SP1003-02HTG, SMDA24-6E3/TR7 offers optimal balance of 24 V system compatibility, 88 pF bandwidth, and SO-8 integration - making it preferred for cost-sensitive industrial I/O where 43 V clamping and −55 °C to +150 °C operation are design-critical.

Availability

SMDA24-6E3/TR7 is available at Aetrix Electronics and suitable for industrial automation, transportation control systems, and factory instrumentation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SMDA24-6E3/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 SMDAxx-6 TVS array product line was designed specifically for board-level ESD/EFT protection of multi-line 24 V industrial interfaces - emphasizing thermal ruggedness, low leakage, and standardized SO-8 manufacturability.

FAQ

What is the standoff voltage rating of SMDA24-6E3/TR7, and why is it critical for 24 V systems?

The SMDA24-6E3/TR7 has a 24 V standoff voltage (V_WM), meaning it remains non-conductive up to 24 V DC or RMS. This matches standard 24 V industrial control bus levels exactly, preventing false triggering during normal operation while ensuring immediate clamping when transients exceed 26.7 V breakdown. Using SMDA24-6E3/TR7 avoids unnecessary power loss or signal distortion in 24 V I/O circuits.

Does SMDA24-6E3/TR7 meet IEC 61000-4-2 Level 4 ESD requirements?

Yes, SMDA24-6E3/TR7 is tested and specified to withstand ±15 kV contact discharge and ±25 kV air discharge per IEC 61000-4-2 Level 4. Its 300 W peak pulse power rating and sub-1 ns response time ensure reliable clamping during ESD events without degradation. The SMDA24-6E3/TR7 datasheet confirms this compliance under standard test conditions.

How many protected lines does SMDA24-6E3/TR7 support, and how are they arranged in the SO-8 package?

SMDA24-6E3/TR7 protects six independent unidirectional lines using all eight pins of the SO-8 package: Pins 1, 2, 4, 5, 7, and 8 serve as anodes for each line, while Pins 3 and 6 are dedicated GND terminals. This dual-GND configuration minimizes ground inductance across all six clamps - a key advantage over single-GND arrays when protecting high-speed or noise-sensitive interfaces with SMDA24-6E3/TR7.

What is the clamping voltage of SMDA24-6E3/TR7 at 5 A, and what does that mean for system protection?

The clamping voltage of SMDA24-6E3/TR7 is 55 V at 5 A (8/20 µs pulse), per the manufacturer's electrical characteristics table. This defines the maximum voltage imposed on protected circuitry during a moderate-energy surge - well below damage thresholds of 24 V-rated transceivers (typically >60 V abs max) and ensuring safe operation even during repeated EFT bursts. That 55 V value is measured directly on SMDA24-6E3/TR7 under standardized test conditions.

Is SMDA24-6E3/TR7 suitable for use in high-temperature environments like motor control cabinets?

Yes, SMDA24-6E3/TR7 is rated for operation from −55 °C to +150 °C, making it suitable for high-temperature industrial environments such as motor control cabinets, railway traction converters, and under-hood automotive ECUs. Its silicon junction and SO-8 mold compound maintain stable V_WM and leakage performance across this full range - a key reliability feature confirmed in the SMDA24-6E3/TR7 datasheet's maximum ratings table.

SMDA24-6E3/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:: 6

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 24V

Voltage - Breakdown (Min):: 26.7V

Voltage - Clamping (Max) @ Ipp:: 55V

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

Power - Peak Pulse:: 300W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: 88pF @ 1MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

SMDA24-6E3/TR7 FAQ

1.How can I place an order for SMDA24-6E3/TR7 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMDA24-6E3/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 SMDA24-6E3/TR7 reliable?

The price and inventory of SMDA24-6E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA24-6E3/TR7 is usually 5 days.

3.What payment methods are accepted for SMDA24-6E3/TR7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA24-6E3/TR7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMDA24-6E3/TR7?

SMDA24-6E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMDA24-6E3/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 SMDA24-6E3/TR7?

For technical support, including SMDA24-6E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA24-6E3/TR7 requirements.

6.How does Aetrix verify that SMDA24-6E3/TR7 is sourced from the original manufacturer or authorized distributors?

All SMDA24-6E3/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 SMDA24-6E3/TR7 meets industry standards.

7.What is the process for return or replacement of SMDA24-6E3/TR7?

All SMDA24-6E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SMDA24-6E3/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 SMDA24-6E3/TR7 part is unused and in its original packaging.

Return procedure for SMDA24-6E3/TR7:

1.Submit a request within 90 days.

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

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