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Semtech Corporation SM12.TCT
- Part No.:
- SM12.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM12.TCT.pdf
- Description:
- TVS DIODE 12VWM 19VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:29,157
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Product details
Overview
SM12.TCT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping voltage across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SM12.TCT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The SM12.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown threshold. Unlike standard TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed dynamic resistance.
It operates over –40°C to +125°C with <20mΩ dynamic resistance, 175pF junction capacitance at 22V, and reverse leakage ≤600nA at VRWM = 22V. The device protects one line with bidirectional capability and requires all six pins connected - three IN and three GND - for full 40A rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo waveform) - ensures downstream ICs like USB PD controllers remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with IEC 61000-4-5 ±1kV (RS=42Ω) industrial surge testing. |
| ESD Withstand | ±30kV contact & air per IEC 61000-4-2 - exceeds Level 4 requirements for handheld and interface port protection. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail use but not suitable for high-speed data lines without additional low-C TVS. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; reduces voltage rise under increasing surge current unlike TVS diodes. |
| Package | DFN 1.6mm × 1.6mm × 0.55mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area. |
Pinout & Package
SM12.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required - energy dissipation occurs within the silicon FET structure. All six terminals must be soldered: three dedicated input pins and three ground pins, arranged for low-inductance parallel connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize inductance and achieve full 40A rating. |
| Pins 4, 5, 6 | IN | Protected line input node; tied together externally to connect to VBus or power/data line requiring 22V EOS protection. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A and –40°C to +125°C - eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Replaces junction-limited TVS with low-RDS(on) MOSFET, enabling higher surge energy absorption without thermal runaway. |
| Ultra-low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving clamping stability. |
| High-energy EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in motor drives and PLC environments. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting VBus lines in USB-C receptacles supporting up to 20V PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at connector, clamping transients before reaching PD controller and load switch. Use Value: Maintains 27.5–28V clamping across temperature - avoids overvoltage damage to 22V-tolerant PD controllers where conventional TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: First-line transient diverter upstream of the load switch, limiting voltage stress on internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of load switches rated for ≤28V absolute max, leveraging stable clamping independent of ambient temperature. |
| IoT Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed smart sensors and edge nodes subjected to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power input, operating without bias or control signals. Use Value: Delivers 40A surge capacity in 1.6mm² footprint - enables compact, ruggedized designs without external crowbar or fuse coordination. |
Use Scenario: Protecting 22V backup power inputs in NVMe SSDs and enterprise storage controllers during hot-plug or system-level surge events. IC Role / Device Role / Timing Role: Bidirectional clamping device on unidirectional 22V supply line, absorbing both positive and negative polarity transients. Use Value: Guarantees ≤28V clamping during 8/20μs surges - prevents overvoltage shutdown or capacitor overstress in tightly regulated backup power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and package - SM12.TCT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference; used interchangeably in BOMs for USB-C and industrial designs. | Select SM12.TCT when sourcing through Aetrix Electronics' channel; identical qualification and traceability to TDS2211P. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.1V VC @ 12.3A, higher clamping, no constant-voltage behavior. | Limited to lower-energy surges; clamping rises with temperature and current - unsuitable for 40A or high-temp industrial use. | Only consider SMAJ22A for cost-sensitive, non-critical 22V lines where 35V+ clamping is acceptable and surge levels stay below 15A. |
Compared with TDS2211P (identical part), SM12.TCT offers identical performance and form factor; versus SMAJ22A, SM12.TCT delivers 30% lower clamping voltage, 3× higher surge current rating, and stable voltage response across temperature - critical for protecting modern 22V-tolerant ICs in USB PD and industrial systems.
Availability
SM12.TCT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT power rail protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM12.TCT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.
The TDS family - including SM12.TCT - was engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection, delivering constant clamping via integrated FET architecture for USB PD, industrial, and storage applications.
FAQ
What is the exact relationship between SM12.TCT and TDS2211P?
SM12.TCT is Semtech's alternate manufacturer marking for the TDS2211P device. Both share identical die, electrical specifications, package dimensions (DFN 1.6×1.6×0.55mm), pinout, and qualification data per Semtech's official ordering documentation and datasheet Rev 2.5. SM12.TCT is not a variant or revision - it is a second source identifier for the same product.
Does SM12.TCT require external bias or control signals to operate?
No, SM12.TCT is a fully passive, self-triggering transient suppressor. It contains an integrated precision trigger circuit and surge-rated FET - no external voltage, enable pin, or configuration is needed. It activates automatically when transient voltage exceeds its breakdown threshold (~25–27.9V), making it ideal for simple, robust front-end protection in SM12.TCT-based designs.
Can SM12.TCT be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SM12.TCT is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V is optimized for power rail or low-frequency I/O protection, not signal integrity. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF); SM12.TCT should only be applied to VBus or auxiliary power lines in those systems.
What is the recommended PCB layout for optimal performance of SM12.TCT?
Place SM12.TCT as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid stubs or splits - this minimizes parasitic inductance and ensures full 40A surge capability in SM12.TCT-based layouts.
Is SM12.TCT compliant with RoHS, REACH, and halogen-free standards?
Yes, SM12.TCT is Pb-free, halogen-free, and compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin. Full compliance documentation is available through Semtech's quality portal and is reflected in SM12.TCT's material declarations.
SM12.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 150pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SM12.TCT FAQ
1.How can I place an order for SM12.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM12.TCT 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 SM12.TCT reliable?
The price and inventory of SM12.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM12.TCT is usually 5 days.
3.What payment methods are accepted for SM12.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM12.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM12.TCT?
SM12.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM12.TCT 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 SM12.TCT?
For technical support, including SM12.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM12.TCT requirements.
6.How does Aetrix verify that SM12.TCT is sourced from the original manufacturer or authorized distributors?
All SM12.TCT 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 SM12.TCT meets industry standards.
7.What is the process for return or replacement of SM12.TCT?
All SM12.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SM12.TCT, 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 SM12.TCT part is unused and in its original packaging.
Return procedure for SM12.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM12.TCT Tags
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