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Microchip Technology SMDA24C-4E3/TR7
- Part No.:
- SMDA24C-4E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA24C-4E3/TR7.pdf
- Description:
- TVS DIODE 24VWM 55VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,150
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Product details
Overview
SMDA24C-4E3/TR7 from Microsemi (now Microchip Technology) is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 24 V standoff voltage (VWM), and 43 V clamping voltage at 1 A. It protects four I/O lines against ESD per IEC 61000-4-2 (±15 kV contact), EFT per IEC 61000-4-4, and lightning-induced surges in industrial interface circuits.
For engineers reviewing the SMDA24C-4E3/TR7 datasheet, SMDA24C-4E3/TR7 pinout, SMDA24C-4E3/TR7 application, or SMDA24C-4E3/TR7 equivalent, key selection criteria include VWM ≥ 24 V circuit operating voltage, sub-100 pF line capacitance for high-speed data integrity, and SO-8 thermal/power derating compatibility with board-level layout constraints.
Technical Context
This TVS array employs silicon avalanche diode technology in a monolithic quad-bidirectional configuration - each of the four channels integrates two back-to-back avalanche diodes to provide symmetrical clamping for AC-coupled or differential signal lines. Its low leakage (<1 µA at 24 V) and tight VBR tolerance (26.7 V min / 30 V max) ensure minimal interference with 24 V logic and industrial control bus signaling.
The device operates across –55 °C to +150 °C and maintains stable clamping performance under repeated surge stress (<0.01% duty cycle), making it suitable for harsh-environment applications where thermal cycling and long-term reliability are critical. Its SO-8 footprint supports standard reflow profiles without requiring thermal relief modifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 24 V - Maximum continuous DC or RMS operating voltage the protected line may see without triggering conduction |
| VBR (Breakdown Voltage @ 1 mA) | 26.7–30 V - Avalanche onset threshold; ensures reliable turn-on before sensitive 24 V logic rails exceed absolute maximum ratings |
| VC @ 1 A (Clamping Voltage) | 43 V - Peak voltage seen by downstream circuitry during 1 A 8/20 µs surge; limits stress on 30 V-rated transceivers |
| VC @ 5 A (Clamping Voltage) | 55 V - Clamped voltage under higher-energy 5 A transient; defines worst-case overvoltage exposure during EFT bursts |
| IPP (Peak Pulse Power) | 300 W (8/20 µs) - Sustains single high-energy surges common in industrial I/O ports without degradation |
| C (Capacitance @ 0 V, 1 MHz) | 90 pF - Low enough to avoid signal integrity issues on RS-485, CAN, or 24 V sensor interfaces up to ~10 Mbps |
| ID (Leakage @ VWM) | <1 µA - Negligible loading on high-impedance 24 V analog inputs or open-collector monitoring lines |
Pinout & Package
SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm body, 1.75 mm max height, gull-wing leads, pin #1 marked by dot on top surface. Thermal pad not present; standard SO-8 PCB land pattern applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of Channel 1 | Connects to Line 1 input; forms one half of bidirectional clamp pair with Pin 2 |
| 2 | Cathode of Channel 1 | Connects to Line 1 return/GND reference; completes symmetric ESD path for Line 1 |
| 3 | Anode of Channel 2 | Connects to Line 2 input; independent bidirectional protection path |
| 4 | Cathode of Channel 2 | Connects to Line 2 return; electrically isolated from other channels |
| 5 | Anode of Channel 3 | Connects to Line 3 input; identical clamping behavior as Channels 1–2 |
| 6 | Cathode of Channel 3 | Line 3 return node; no internal connection to Pins 1–4 or 7–8 |
| 7 | Anode of Channel 4 | Line 4 input terminal; supports discrete routing for multi-channel industrial I/O |
| 8 | Cathode of Channel 4 | Line 4 return; enables star-grounding or individual GND plane tie-down per channel |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 4-line protection | Single SO-8 IC replaces four discrete TVS diodes - reduces PCB area by >60% and eliminates inter-channel skew |
| IEC 61000-4-2 ESD compliance | Withstands ±15 kV contact discharge without parametric shift - meets industrial equipment immunity requirements |
| Low 90 pF line capacitance | Preserves signal edge rate on 24 V digital I/O (e.g., PLC discrete inputs) up to 10 Mbps without added jitter |
| –55 °C to +150 °C operation | Validated for under-hood automotive control modules and factory-floor motor drive I/O cards without derating |
| 300 W peak pulse rating (8/20 µs) | Handles induced lightning surges per IEC 61000-4-5 Level 3 (2 kV line-earth) when used with series impedance |
Applications
| Industrial PLC Digital I/O Modules | 24 V Sensor Interface Boards |
|---|---|
Use Scenario: Protection of discrete 24 V sink/source inputs in programmable logic controller backplanes exposed to field wiring transients. IC Role / Device Role / Timing Role: Board-level transient suppressor placed directly at connector entry point, clamping surges before they reach optocoupler or MCU GPIO. Use Value: Prevents latch-up or permanent damage to 24 V-tolerant microcontrollers and isolation drivers during maintenance hot-plug events or cable coupling. | Use Scenario: Shielding analog/digital 24 V sensors (e.g., pressure transmitters, proximity switches) from ESD during installation or EFT noise in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end surge limiter on sensor signal lines, operating in parallel with RC filtering and before signal conditioning amplifiers. Use Value: Maintains <1 µA leakage to avoid offset errors in precision 4–20 mA loop receivers while suppressing ±8 kV ESD per IEC 61000-4-2. |
| RS-485/422 Fieldbus Nodes | Motor Drive Control I/O Terminals |
Use Scenario: Protecting differential 24 V RS-485 transceiver lines (A/B) and associated enable/control pins in industrial networking nodes. IC Role / Device Role / Timing Role: Symmetric bidirectional clamp on each data line and control line, preserving differential mode integrity during fast transients. Use Value: Limits common-mode overvoltage to <55 V during 5 A EFT bursts, preventing transceiver shutdown or false state transitions in Modbus RTU networks. | Use Scenario: Safeguarding start/stop, direction, and fault feedback lines between PLCs and variable frequency drives in noisy electrical environments. IC Role / Device Role / Timing Role: Point-of-entry suppression on 24 V control wiring, coordinated with chassis ground bonding to divert surge current away from logic circuitry. Use Value: Enables uninterrupted operation during 300 W lightning-induced surges on adjacent power cables, avoiding nuisance tripping or communication loss. |
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-Q | Unidirectional, DO-214AC package, 300 W, VC = 38.9 V @ 7.7 A - lower clamping but single-line only | Requires four separate devices and larger PCB area; lacks integrated multi-line coordination | Prefer when space allows discrete layout and unidirectional protection suffices (e.g., DC-powered lines with defined polarity) |
| SP1003-02HTG | Quad bidirectional, SOT-23-6 package, 150 W, VC = 45 V @ 1 A, C = 15 pF - lower power, much lower capacitance | Better for high-speed data (e.g., USB 2.0), but insufficient for 2 kV lightning surge handling per IEC 61000-4-5 | Choose when ESD-only protection is needed on low-voltage, high-frequency lines; not suitable for 24 V industrial surge immunity |
Compared with SMAJ24A-Q and SP1003-02HTG, the SMDA24C-4E3/TR7 uniquely delivers quad bidirectional 300 W surge capability in SO-8 - balancing board density, robustness against combined ESD/EFT/lightning threats, and compatibility with legacy 24 V industrial I/O layouts without redesign.
Availability
SMDA24C-4E3/TR7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, 24 V sensor interface boards, RS-485 fieldbus nodes, and motor drive control terminals requiring stable component supply across extended product lifecycles.
Supply support for SMDA24C-4E3/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 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 TVSarray™ series - including SMDA24C-4E3/TR7 - was engineered specifically for board-level ESD and surge protection in harsh industrial environments, emphasizing robustness, predictable clamping, and long-term parametric stability under thermal stress.
FAQ
What is the standoff voltage rating of the SMDA24C-4E3/TR7?
The SMDA24C-4E3/TR7 has a standoff voltage (VWM) of 24 V, meaning it remains non-conductive up to this DC or RMS voltage level. This matches standard 24 V industrial control systems and ensures no interference with normal operation while providing margin before clamping begins at 26.7 V minimum breakdown.
Does the SMDA24C-4E3/TR7 support bidirectional signal lines like RS-485?
Yes, the SMDA24C-4E3/TR7 integrates four independent bidirectional TVS channels using back-to-back diode pairs per line. This architecture preserves signal symmetry on differential buses such as RS-485 and RS-422, enabling effective clamping of both positive and negative transients without polarity constraints.
What is the clamping voltage of the SMDA24C-4E3/TR7 at 5 A surge current?
The SMDA24C-4E3/TR7 clamps to a maximum of 55 V at 5 A (8/20 µs waveform), as specified in the MSC0886 datasheet. This value defines the upper voltage limit imposed on protected circuitry during high-energy EFT or induced lightning events, ensuring compatibility with 30–36 V tolerant transceivers and interface ICs.
Is the SMDA24C-4E3/TR7 RoHS compliant and lead-free?
Yes, the SMDA24C-4E3/TR7 is RoHS compliant and manufactured with lead-free terminations. The "E3" suffix in the part number denotes lead-free plating per JEDEC J-STD-609, and the device meets exemption 7a for high-melting-temperature solder alloys as required for industrial-grade reliability.
Can the SMDA24C-4E3/TR7 replace the SMDA24C-4 in existing designs?
Yes, the SMDA24C-4E3/TR7 is a direct replacement for SMDA24C-4, sharing identical electrical specifications, SO-8 package dimensions, and pinout. The "E3/TR7" suffix indicates lead-free finish and tape-and-reel packaging (7-inch reel, 2500 pcs), with no functional or thermal performance differences from the base SMDA24C-4 variant.
SMDA24C-4E3/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:
- 4
- 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:
- 90pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SMDA24C-4E3/TR7 FAQ
1.How can I place an order for SMDA24C-4E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA24C-4E3/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 SMDA24C-4E3/TR7 reliable?
The price and inventory of SMDA24C-4E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA24C-4E3/TR7 is usually 5 days.
3.What payment methods are accepted for SMDA24C-4E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA24C-4E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA24C-4E3/TR7?
SMDA24C-4E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA24C-4E3/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 SMDA24C-4E3/TR7?
For technical support, including SMDA24C-4E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA24C-4E3/TR7 requirements.
6.How does Aetrix verify that SMDA24C-4E3/TR7 is sourced from the original manufacturer or authorized distributors?
All SMDA24C-4E3/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 SMDA24C-4E3/TR7 meets industry standards.
7.What is the process for return or replacement of SMDA24C-4E3/TR7?
All SMDA24C-4E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SMDA24C-4E3/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 SMDA24C-4E3/TR7 part is unused and in its original packaging.
Return procedure for SMDA24C-4E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA24C-4E3/TR7 Tags
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