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Semtech Corporation SMS12.TCT
- Part No.:
- SMS12.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
SMS12.TCT.pdf
- Description:
- TVS DIODE 12VWM 23VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,674
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Product details
Overview
SMS12.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 peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SMS12.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat voltage response, DFN-6 package layout constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SMS12.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 conventional TVS diodes, its clamping voltage remains nearly constant from 1A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains stable 27.5–28V clamping up to 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), and delivers 1120W peak pulse power while exhibiting only 130–600nA reverse leakage at 22V standoff.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without triggering |
| Clamping Voltage | 27.5–28V at 40A - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD stress levels |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing current |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with medium-speed power/data lines; not suitable for >1Gbps differential pairs |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - requires symmetric trace routing and multi-via ground connections for optimal surge dissipation |
Pinout & Package
Package: DFN-6 (1.6 mm × 1.6 mm × 0.55 mm), Pb-free, RoHS-compliant, UL 94V-0 molding compound, marked "T22" + date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must be connected with low-inductance vias to maximize surge current handling |
| Pins 4, 5, 6 | IN | Protected line input; parallel connection required to distribute surge current and minimize trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates design margin inflation needed with traditional TVS |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - enables reliable operation in uncontrolled thermal environments |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces IR drop and improves energy diversion efficiency |
| High-energy surge rating | 1120W peak pulse power - supports repeated exposure to 40A surges without degradation |
| Integrated trigger + FET topology | No external bias or control required - single-component solution with self-activating shunt behavior |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt device placed directly at connector, clamping transients before reaching PD controller and load switch. Use Value: Maintains 27.5–28V clamping across full temperature range, preventing false overvoltage shutdown or latch-up in PD controllers rated for ≤24V absolute max. |
Use Scenario: Front-end protection for high-side load switches (e.g., HS2950P) in remote meters and robotics power rails. IC Role / Device Role / Timing Role: Surge diverter placed between input source and load switch VIN pin to limit voltage stress on internal FET gate oxide. Use Value: Limits clamping to 28V at 40A, staying below typical 30V FET drain-source breakdown, thereby extending load switch lifetime under lightning-induced surges. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Backup Rail Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input rail, coordinated with upstream fuse and downstream LDO. Use Value: Delivers 40A surge handling in 1.6 mm² footprint - enabling compact, ruggedized designs without sacrificing industrial-grade immunity. |
Use Scenario: Protecting 22V backup power rails in NVMe SSDs and enterprise storage controllers during hot-swap or power sequencing events. IC Role / Device Role / Timing Role: Clamping device on backup VCC line feeding real-time clock and firmware retention circuitry. Use Value: 175pF capacitance avoids signal integrity issues on low-frequency backup rails, while ±30kV ESD rating prevents latch-up during handling or connector mating. |
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 and DFN-6 package; same marking "T22", identical 22V working voltage and 27.5–28V clamping. | Direct second-source part from Semtech; identical qualification, tape-and-reel packaging (3,000 pcs/reel), and manufacturing lot traceability. | Select TDS2211P.C when dual-sourcing or extended lead time coverage is required without design revalidation. |
| SP1003-02HTG | TVS diode (not FET-based); 24V working voltage, 38.7V clamping at 40A, higher dynamic resistance (~150mΩ), 120pF capacitance. | Lacks flat clamping behavior - clamping rises significantly with temperature and current; suitable only where 38.7V clamping is acceptable. | Choose SP1003-02HTG only if board space allows larger SOD-323 package and system can tolerate higher clamping voltage margin. |
Compared with SMS12.TCT, TDS2211P.C offers identical performance and supply chain flexibility, while SP1003-02HTG trades clamping precision and thermal stability for lower cost and smaller capacitance - making it viable only in non-critical 24V rails where 38.7V clamping does not violate downstream IC limits.
Availability
SMS12.TCT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT edge node power buses, and storage device backup rails requiring stable component supply with guaranteed long-term availability.
Supply support for SMS12.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, sensing, and connectivity.
SMS12.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability 20–24V power and interface protection applications demanding flat clamping and temperature stability.
FAQ
What is the exact clamping voltage of SMS12.TCT at 40A surge current?
The SMS12.TCT clamps at 27.5–28V under IEC 61000-4-5 combination waveform (1.2/50μs voltage + 8/20μs current, RS = 2Ω) at 40A peak pulse current. This value is guaranteed across –40°C to +125°C and reflects the device's FET-based architecture, which maintains near-constant voltage via decreasing RDS(on). The SMS12.TCT datasheet specifies this as a design-critical parameter for protecting 24V-rated ICs.
Is SMS12.TCT pin-compatible with TDS2211P.C?
Yes, SMS12.TCT is pin-compatible with TDS2211P.C: both use identical DFN-6 (1.6 × 1.6 mm) packages with matching pin 1 location, GND on pins 1–3, and IN on pins 4–6. They share identical electrical specifications, marking ("T22"), and tape-and-reel packaging. SMS12.TCT and TDS2211P.C are functionally interchangeable without PCB modification or layout change.
Can SMS12.TCT protect USB Type-C CC lines?
No, SMS12.TCT is not suitable for USB Type-C CC (Configuration Channel) lines. Its 175pF junction capacitance and 22V working voltage exceed the low-capacitance (<10pF) and low-voltage (5V-typical) requirements of CC signaling. For CC/SBU protection, Semtech recommends uClamp2411ZA - a 24V, <10pF device. SMS12.TCT is intended for VBus or power-line protection, not data-line ESD suppression.
What is the maximum ambient temperature SMS12.TCT supports during surge events?
SMS12.TCT is rated for continuous operation from –40°C to +125°C, and its clamping performance remains stable across this full range during surge events. At +125°C, the device still delivers 27.5–28V clamping at 40A - verified per Figure 3 in the official datasheet. This makes SMS12.TCT suitable for under-hood automotive modules, industrial motor drives, and enclosed IoT enclosures where thermal management is constrained.
Does SMS12.TCT require external bias or control circuitry?
No, SMS12.TCT operates autonomously without external bias, enable signals, or control logic. Its internal precision trigger circuit activates the shunt FET when transient voltage exceeds breakdown threshold - fully self-contained. SMS12.TCT connects only between protected line (pins 4–6) and ground (pins 1–3), making it a true plug-in protection solution ideal for space-constrained layouts where simplicity and reliability are critical.
SMS12.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:
- 4
- 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:
- 350W
- 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
SMS12.TCT FAQ
1.How can I place an order for SMS12.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS12.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 SMS12.TCT reliable?
The price and inventory of SMS12.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS12.TCT is usually 5 days.
3.What payment methods are accepted for SMS12.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS12.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS12.TCT?
SMS12.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS12.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 SMS12.TCT?
For technical support, including SMS12.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS12.TCT requirements.
6.How does Aetrix verify that SMS12.TCT is sourced from the original manufacturer or authorized distributors?
All SMS12.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 SMS12.TCT meets industry standards.
7.What is the process for return or replacement of SMS12.TCT?
All SMS12.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMS12.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 SMS12.TCT part is unused and in its original packaging.
Return procedure for SMS12.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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