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Semtech Corporation SM24.TCT
- Part No.:
- SM24.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM24.TCT.pdf
- Description:
- TVS DIODE 24VWM 43VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:76,757
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Product details
Overview
SM24.TCT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 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 across full current and temperature range (−40°C to +125°C), deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SM24.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 high-reliability embedded and power delivery systems.
Technical Context
The SM24.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 standard TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge.
It operates with reverse stand-off voltage of 22V, breakdown at 25–27.9V, and maintains ≤28V clamping up to 40A (8/20μs) and across −40°C to +125°C ambient, enabling robust protection where thermal derating and voltage margin are critical - especially for USB PD controllers and industrial e-fuses exposed to lightning surges and contact ESD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below absolute max ratings during surge events. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in handheld and connector-facing designs. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD power inputs. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
Pinout & Package
SM24.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with wettable flank terminations, optimized for automated optical inspection and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current - all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus, USB PD input, or load switch VIN; all three pins conduct surge current in parallel. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 1A to 40A and −40°C to +125°C - avoids thermal runaway and overvoltage failure common in TVS diodes. |
| FET-based shunt topology | Surge energy dissipated in low-RDS(on) channel instead of PN junction - enables higher IPP and longer lifetime under repeated surges. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during fast transients and improves system-level surge margin. |
| DFN-6 footprint | 1.6mm × 1.6mm area - saves >50% board space vs. SO-8 or SOT-23 TVS solutions while supporting 40A surge rating. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB-C PD ports against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed immediately after the connector, before the PD controller and buck converter. Use Value: Maintains clamping at ≤28V across temperature and current - prevents damage to PD controllers rated for 30V abs max, even at 125°C ambient. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways. IC Role / Device Role / Timing Role: Front-line transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch during 1kV/42Ω IEC 61000-4-5 surges by holding clamping below 28V regardless of ambient temperature. |
| Notebook/Tablet 22V System Rail Protection | Storage Device Power Bus Protection |
|
Use Scenario: Securing 22V auxiliary rails in ultrabooks and tablets powering SSD controllers, display backlights, or fan drivers. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power distribution node, upstream of DC-DC regulators and PMICs. Use Value: Delivers ±30kV ESD immunity and 40A surge capability in minimal area - avoids design compromises like oversized TVS or redundant protection stages. |
Use Scenario: Protecting 22V power inputs to NVMe SSD modules and enterprise storage enclosures exposed to field surges and handling ESD. IC Role / Device Role / Timing Role: High-energy clamping device placed at board edge near power connector, before bulk capacitance and LDOs. Use Value: Ensures reliable operation under repetitive 4kV EFT bursts (IEC 61000-4-4) and 40A lightning surges without parameter drift or degradation. |
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 DFN-6 package - direct manufacturer-recommended replacement with identical marking (T22). | Identical use case: 22V bus protection with constant-clamp FET architecture. | Select TDS2211P when sourcing from Semtech-authorized channels; SM24.TCT is a valid alternate part number per Semtech documentation. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Designed for low-capacitance data line protection (e.g., USB-C CC pins), not 22V power bus clamping. | Use uClamp2411ZA only for signal-line protection; SM24.TCT remains preferred for VBus and load switch input protection due to higher IPP and constant-clamp stability. |
Compared with TDS2211P, SM24.TCT is electrically and mechanically identical - same clamping, same package, same reliability - making it a fully interchangeable option. Compared with uClamp2411ZA, SM24.TCT provides 67% higher surge current rating and is purpose-built for power rail protection, not signal integrity-critical interfaces.
Availability
SM24.TCT is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch protection, and notebook 22V system rail designs requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SM24.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 sensing, power management, and transient protection.
The SM24.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) family - engineered to replace conventional TVS diodes in high-reliability 22V power rail applications where stable clamping, temperature independence, and high surge endurance are mandatory.
FAQ
What is the exact working voltage rating of SM24.TCT?
The SM24.TCT has a reverse stand-off voltage (VRWM) of 22V, meaning it remains non-conductive up to this DC or continuous AC voltage level on the protected line. This matches typical USB PD VBus nominal voltages and ensures no leakage or false triggering during normal operation.
Does SM24.TCT meet IEC 61000-4-5 surge immunity standards?
Yes, SM24.TCT is rated for 40A peak pulse current with an 8/20μs waveform per IEC 61000-4-5, and supports ±1kV combination-wave testing (1.2/50μs voltage, 8/20μs current, RS = 42Ω). Its stable 27.5–28V clamping ensures compliance in industrial and USB PD applications requiring Level 4 surge immunity.
How does SM24.TCT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SM24.TCT uses a triggered FET shunt that maintains clamping at 27.5–28V from 1A to 40A and across −40°C to +125°C - eliminating thermal derating concerns and improving system-level surge margin.
What is the recommended PCB layout for SM24.TCT?
Place SM24.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 thermal pads - energy is dissipated in the FET channel, not the die junction.
Is SM24.TCT compatible with automated optical inspection (AOI)?
Yes, SM24.TCT uses a DFN-6 package with wettable flank terminations and laser-marked "T22" identification - features explicitly supported by AOI systems for solder joint quality verification. Its 0.55mm profile and 0.3mm pitch also align with standard SMT process capabilities.
SM24.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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 60pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SM24.TCT FAQ
1.How can I place an order for SM24.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM24.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 SM24.TCT reliable?
The price and inventory of SM24.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM24.TCT is usually 5 days.
3.What payment methods are accepted for SM24.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM24.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM24.TCT?
SM24.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM24.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 SM24.TCT?
For technical support, including SM24.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM24.TCT requirements.
6.How does Aetrix verify that SM24.TCT is sourced from the original manufacturer or authorized distributors?
All SM24.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 SM24.TCT meets industry standards.
7.What is the process for return or replacement of SM24.TCT?
All SM24.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SM24.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 SM24.TCT part is unused and in its original packaging.
Return procedure for SM24.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM24.TCT Tags
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