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Semtech Corporation SMS15.TCT
- Part No.:
- SMS15.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
SMS15.TCT.pdf
- Description:
- TVS DIODE 15VWM 29VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
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Product details
Overview
SMS15.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, 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SMS15.TCT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection where low-voltage overshoot control is critical.
Technical Context
The SMS15.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 - 27.5–28V across 24–40A and −40°C to +125°C - due to decreasing RDS(on) under surge conditions.
It protects one line with bidirectional capability, supports unsymmetrical surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs), and delivers 1120W peak pulse power. Its 175pF capacitance at 22V/1MHz and <600nA leakage at VRWM make it suitable for medium-speed data/power lines where signal integrity and low standby loss are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage before activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures protected ICs see minimal overvoltage during worst-case surges. |
| Peak Pulse Current | 40A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 system-level ESD immunity without degradation. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with USB PD and industrial control lines where sub-200pF loading is acceptable. |
| Leakage Current | ≤600nA at 22V - ensures negligible power loss in always-on 22V bus monitoring or load switch enable paths. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, marked "T22" + date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to maximize current sharing and minimize parasitic inductance. |
| Pin 4, 5, 6 | IN | Protected line input; tied together to handle full 40A surge across parallel bond wires and internal FET channels. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C - eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) MOSFET, reducing energy dissipation in silicon junction and improving reliability under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz bursts) - protects against fast repetitive transients in motor drives and PLC I/O. |
| Board-space optimized | 1.6mm × 1.6mm footprint saves >50% area vs. SO-8 or SOT-23 TVS solutions rated for equivalent 40A surge. |
| Robust thermal performance | Rated for continuous operation from −40°C to +125°C ambient with no clamping voltage drift - validated across full temp range in datasheet Figure 3. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB Type-C ports supporting up to 20V PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - stays below 30V damage threshold of common PD controllers (e.g., FUSB302, TUSB546), unlike TVS diodes whose clamping rises to >38V at same conditions. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P, TPS229xx) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient clamp preventing gate oxide rupture or drain-source avalanche in the load switch's internal FET. Use Value: Limits transient voltage to ≤28V during ±1kV IEC 61000-4-5 surges - well below typical 30–35V absolute maximum ratings of integrated load switch inputs. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways or edge AI modules subject to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power input, upstream of DC-DC converters and PMICs. Use Value: Delivers 1120W peak pulse power handling with only 175pF capacitance - avoids signal distortion on shared power rails feeding sensitive RF or sensor subsystems. |
Use Scenario: Protecting 22V supply inputs of NVMe SSD enclosures, SAS expanders, or enterprise HDD backplanes exposed to hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: Point-of-load transient suppressor mounted directly at connector interface to prevent latch-up or burnout in storage controller ICs. Use Value: Guarantees ≤28V clamping across full temperature range - ensures compatibility with 24V-tolerant storage PHYs and avoids false overvoltage shutdowns during surge events. |
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, Semtech-marked variant with tape-and-reel packaging (3,000 pcs/reel). | No functional difference; used interchangeably in production where reel packaging is required. | Select TDS2211P.C for automated SMT assembly; SMS15.TCT is functionally identical but may differ in traceability or lot marking. |
| SP1003-02HTG | Lower 30A (8/20μs) rating, 33V clamping at 30A, 22V working voltage, SOD-323 package - higher clamping, smaller footprint, no multi-pin parallel conduction. | Less robust for 40A industrial surges; suited for space-constrained consumer USB ports where 30A margin suffices. | Choose SP1003-02HTG only if board area is critical and surge requirement is ≤30A; SMS15.TCT provides superior clamping stability and current headroom. |
Compared with TDS2211P.C and SP1003-02HTG, SMS15.TCT offers identical protection performance to TDS2211P.C while delivering significantly flatter clamping and higher surge margin than SP1003-02HTG - making it optimal for industrial and USB PD designs demanding guaranteed ≤28V clamping under worst-case thermal and current stress.
Availability
SMS15.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SMS15.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 analog and mixed-signal ICs for precision sensing, protection, wireless, and optical communications.
The SMS15.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 applications where clamping voltage stability across temperature and current is mission-critical.
FAQ
What is the clamping voltage behavior of SMS15.TCT across temperature and current?
The SMS15.TCT maintains a tightly regulated clamping voltage of 27.5–28V across its full rated 24–40A peak pulse current range and operating temperature span of −40°C to +125°C. This stability results from its FET-based shunt architecture, where RDS(on) decreases under surge, counteracting voltage rise - unlike TVS diodes whose clamping increases linearly with both current and temperature. Data is confirmed in Figures 3 and 4 of the official Semtech datasheet.
Is SMS15.TCT pin-compatible with other Semtech TDS devices like TDS2211P?
Yes, SMS15.TCT is functionally and physically identical to TDS2211P - same DFN-6 package, identical pin configuration (Pins 1–3 = GND, Pins 4–6 = IN), matching electrical specifications, and shared thermal/mechanical characteristics. Both share the same die, layout, and test flow; SMS15.TCT is a valid alternate marking per Semtech's ordering documentation.
Can SMS15.TCT protect USB Type-C VBUS lines operating at 20V PD profiles?
Yes, SMS15.TCT is explicitly validated for USB Type-C VBUS protection in Semtech's application note (Figure 4). With a 22V working voltage and 27.5–28V clamping at 40A, it safely contains transients below the 30V damage threshold of common PD controllers - even at 125°C - where standard TVS diodes exceed 38V. Its 175pF capacitance does not impair PD communication.
What is the recommended PCB layout for SMS15.TCT to achieve full 40A surge rating?
To achieve the full 40A (8/20μs) rating, all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) must be shorted together respectively using wide, low-inductance traces. Place SMS15.TCT within 5mm of the protected connector. Use ≥4 vias per GND pad connecting to an inner ground plane, and avoid thermal relief on GND pads. Layout guidance is detailed in Figure 7 of the Semtech datasheet.
Does SMS15.TCT meet IEC 61000-4-5 Level 4 surge immunity requirements?
Yes, SMS15.TCT is rated for 40A (8/20μs) and ±1kV (1.2/50μs, RS = 42Ω) per IEC 61000-4-5, satisfying Level 4 industrial surge immunity. Its low dynamic resistance (20mΩ) and constant clamping ensure protected downstream components remain within safe voltage limits during standardized surge testing - confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.
SMS15.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):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 29V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 100pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SMS15.TCT FAQ
1.How can I place an order for SMS15.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS15.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 SMS15.TCT reliable?
The price and inventory of SMS15.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS15.TCT is usually 5 days.
3.What payment methods are accepted for SMS15.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS15.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS15.TCT?
SMS15.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS15.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 SMS15.TCT?
For technical support, including SMS15.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS15.TCT requirements.
6.How does Aetrix verify that SMS15.TCT is sourced from the original manufacturer or authorized distributors?
All SMS15.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 SMS15.TCT meets industry standards.
7.What is the process for return or replacement of SMS15.TCT?
All SMS15.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMS15.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 SMS15.TCT part is unused and in its original packaging.
Return procedure for SMS15.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS15.TCT Tags
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