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Semtech Corporation SMS12C.TCT
- Part No.:
- SMS12C.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
SMS12C.TCT.pdf
- Description:
- TVS DIODE 12VWM 23VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,245
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Product details
Overview
SMS12C.TCT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and ultra-low 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the SMS12C.TCT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with documented functional trade-offs.
Technical Context
The SMS12C.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. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and maintains stable 27.5–28V clamping up to 125°C - a key differentiator versus standard TVS devices whose clamping rises with temperature and current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - supports USB PD bus and industrial 24V rail protection without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays within safe margin below typical 30V+ IC damage thresholds. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-6-2 requirements. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting, minimizing energy dissipation in protected FETs. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power and low-speed signal line protection (not high-speed data). |
| Operating Temp | −40°C to +125°C - qualified for automotive under-hood and industrial control cabinet environments. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to maximize 40A capability and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); parallel connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A range and −40°C to +125°C - eliminates design margin uncertainty vs. TVS diodes. |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - enables low RDS(on) conduction instead of junction-limited avalanche. |
| Low dynamic resistance | 20mΩ - reduces voltage overshoot during fast-rising transients and minimizes self-heating under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLCs. |
| Small footprint | 1.6mm × 1.6mm DFN - saves >50% board area vs. SOT-23 or SOIC alternatives while maintaining 1120W peak power rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 125°C - prevents overvoltage damage to downstream PD controllers rated ≤30V. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide and drain-source junction. Use Value: Keeps clamping below 30V during 40A surges - avoids permanent degradation of load switch RDS(on) and OVP circuitry. |
| Industrial I/O Module Protection | Notebook/Tablet DC Power Rail Protection |
Use Scenario: Shielding 24V auxiliary rails in programmable logic controllers (PLCs) and sensor hubs from field wiring transients. IC Role / Device Role / Timing Role: Single-device solution for unsymmetrical line protection per IEC 61000-4-5 ±1kV (RS = 42Ω). Use Value: Delivers 1120W peak power handling in 2.56mm² footprint - replaces multi-component TVS + series resistor solutions. |
Use Scenario: Securing main DC input (e.g., 19V adapter rail) in thin-client notebooks and rugged tablets against accidental AC coupling or hot-plug spikes. IC Role / Device Role / Timing Role: Standalone clamping device placed directly at power entry point before buck converter input capacitors. Use Value: 175pF capacitance avoids interference with 100kHz–1MHz switching regulators - no filtering compromise required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking (T22), but differs only in reel quantity (3,000 pcs vs. SMS12C.TCT's unspecified quantity). | No functional difference; both rated for USB PD, load switch, and industrial 22V rail protection. | Select TDS2211P.C if volume procurement requires standard 3k/reel packaging; otherwise SMS12C.TCT is functionally interchangeable. |
| uClamp2411ZA.TCT | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, and smaller 1.0mm × 0.6mm SOD-323 package. | Better suited for CC/SBU lines in USB-C; insufficient for 40A VBUS protection due to lower surge rating. | Choose uClamp2411ZA.TCT only for low-current auxiliary lines; SMS12C.TCT remains mandatory for main power rail protection. |
Compared with TDS2211P.C, SMS12C.TCT offers identical protection performance and package; compared with uClamp2411ZA.TCT, SMS12C.TCT provides 2× higher surge current capacity and 5.5V lower clamping - making it the sole viable option for 22V power bus hardening.
Availability
SMS12C.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and notebook DC input protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMS12C.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 ICs for precision protection, sensing, and signal integrity.
SMS12C.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection where stable clamping across temperature and current is non-negotiable.
FAQ
What is the exact package type and dimensions of SMS12C.TCT?
SMS12C.TCT uses a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. Pins 1–3 are GND; pins 4–6 are IN. The land pattern matches Semtech's standardized DFN-6 footprint, and the device is Pb-free, RoHS-compliant, and UL 94V-0 rated. No thermal pad is required, as energy is dissipated in the active FET structure.
Does SMS12C.TCT meet IEC 61000-4-5 surge immunity standards?
Yes, SMS12C.TCT is rated for 40A peak pulse current (8/20μs) and ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω), fully satisfying IEC 61000-4-5 Level 4 for industrial equipment. Its 27.5–28V clamping at 40A ensures protected ICs remain within safe operating voltage limits during surge events.
How does SMS12C.TCT differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes - whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN) and temperature - SMS12C.TCT maintains near-constant 27.5–28V clamping from 24A to 40A and across −40°C to +125°C. This results from its FET-based shunt architecture, where RDS(on) decreases under surge, stabilizing voltage drop.
Can SMS12C.TCT be used on high-speed data lines like USB SuperSpeed?
No, SMS12C.TCT is not suitable for USB 3.x SuperSpeed (TX/RX) or DisplayPort lines due to its 175pF junction capacitance, which would severely degrade signal integrity. It is intended exclusively for DC power rails and low-speed control lines (e.g., VBUS, CC, SBU, load switch EN/VIN). For high-speed lines, Semtech recommends RClamp3371ZC (<0.25pF).
What is the maximum continuous reverse leakage current for SMS12C.TCT at 22V?
At VRWM = 22V and TA = 25°C, SMS12C.TCT exhibits reverse leakage current of 130–600nA. This low leakage ensures minimal standby power loss in battery-powered IoT devices and avoids false triggering in always-on industrial monitoring circuits.
SMS12C.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SOT-23-6
- Series:
- SMS
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 5
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 23V
- Current - Peak Pulse (10/1000µs):
- 15A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 135pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SMS12C.TCT FAQ
1.How can I place an order for SMS12C.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS12C.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 SMS12C.TCT reliable?
The price and inventory of SMS12C.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS12C.TCT is usually 5 days.
3.What payment methods are accepted for SMS12C.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS12C.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS12C.TCT?
SMS12C.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS12C.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 SMS12C.TCT?
For technical support, including SMS12C.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS12C.TCT requirements.
6.How does Aetrix verify that SMS12C.TCT is sourced from the original manufacturer or authorized distributors?
All SMS12C.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 SMS12C.TCT meets industry standards.
7.What is the process for return or replacement of SMS12C.TCT?
All SMS12C.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMS12C.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 SMS12C.TCT part is unused and in its original packaging.
Return procedure for SMS12C.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS12C.TCT Tags
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