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Semtech Corporation SMS24.TCT
- Part No.:
- SMS24.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
SMS24.TCT.pdf
- Description:
- TVS DIODE 24VWM 44VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,150
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Product details
Overview
SMS24.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, 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 SMS24.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 compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards in high-voltage bus protection.
Technical Context
The SMS24.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) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains stable 22V reverse stand-off voltage and <600nA leakage at VRWM, and delivers 1120W peak pulse power. Its functional architecture separates trigger threshold (≈27V VBR) from conduction path, enabling superior thermal and current-handling performance versus junction-limited TVS devices.
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 wave) - ensures downstream ICs (e.g., USB PD controllers) remain below damage thresholds during surge events. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) on unsymmetrical lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in handheld and connector-facing designs. |
| Dynamic Resistance | 20mΩ - enables minimal voltage rise under increasing current, critical for maintaining tight clamping across full surge range. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC power rails and low-speed signal lines (e.g., CC/SBU, VBUS), not suited for >1Gbps data lanes. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, UL 94V-0 molding compound, lead-free finish, tape-and-reel packaging (3,000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3 | GND | Common ground return for surge current; all three must be connected with low-inductance paths (e.g., multiple vias) to maximize 40A handling. |
| Pin 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); all three pins are internally paralleled and must be shorted externally for rated performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - avoids overvoltage risk during worst-case surge currents where standard TVS voltage rises linearly. |
| Temperature-stable clamping | Clamps at ~27.5V across –40°C to +125°C - eliminates derating and enables reliable protection in automotive under-hood or industrial ambient environments. |
| FET-based surge conduction | Dissipates energy in low-RDS(on) channel rather than PN junction - improves reliability and cycle life vs. thermally stressed TVS diodes. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving voltage margin for downstream overvoltage protection. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary high-energy EOS suppressor placed directly at connector, shunting transients before reaching PD controller or buck converter. Use Value: Maintains 27.5V clamping at full 40A surge - keeps PD controller gate oxide and internal FETs within safe operating area, even at 125°C ambient. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: First-line transient diverter upstream of e-fuse ICs, preventing gate oxide failure and latch-up during 40A surge events. Use Value: Limits voltage across load switch input to ≤28V - avoids breakdown of internal high-side MOSFET and preserves OVP/UVLO functionality during surge recovery. |
| IoT Device DC Power Rail Protection | Notebook/Tablet Main Power Bus Protection |
Use Scenario: Securing 12–24V DC input rails in battery-powered IoT gateways subjected to hot-plug, cable discharge, and EFT bursts. IC Role / Device Role / Timing Role: Standalone EOS protector on main system rail, replacing multi-stage TVS+MLV solutions to reduce BOM count and board space. Use Value: Delivers 1120W peak pulse power in 1.6×1.6mm footprint - achieves >50% board area reduction versus discrete TVS+capacitor approaches. |
Use Scenario: Hardening 20V VBUS lines in ultrabooks and 2-in-1 tablets against accidental adapter misconnection and ESD coupling from metal chassis. IC Role / Device Role / Timing Role: High-reliability clamping device co-located with USB-C receptacle, ensuring consistent protection across product lifecycle and thermal profiles. Use Value: Stable 27.5V clamping independent of temperature - eliminates need for thermal derating margins, simplifying safety validation for UL/IEC certification. |
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 - direct manufacturer-equivalent marking variant per Semtech ordering documentation. | Identical use case and placement; functionally interchangeable in all TDS2211P-designated layouts. | Select SMS24.TCT when sourcing from authorized Semtech distribution channels requiring traceable lot coding per TCT suffix convention. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but only 12A IPP (8/20μs); higher clamping (~33V at 12A); 0.25pF capacitance. | Targeted at low-capacitance signal lines (CC/SBU), not power rails - insufficient current rating or clamping for VBUS or load switch inputs. | Use uClamp2411ZA only for auxiliary signal protection; SMS24.TCT remains required for primary 22V power rail surge suppression. |
Compared with TDS2211P, SMS24.TCT is a functionally identical Semtech-marked variant with identical clamping, thermal, and surge performance - while uClamp2411ZA serves complementary low-capacitance roles but cannot replace SMS24.TCT in high-current power-line protection due to lower IPP and higher VC.
Availability
SMS24.TCT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and IoT power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SMS24.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, and signal integrity.
SMS24.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) family - engineered to replace traditional TVS diodes in high-voltage, high-energy EOS applications where flat clamping and temperature stability are critical.
FAQ
What is the exact package type and dimensions of SMS24.TCT?
SMS24.TCT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad-less construction. Pin 1–3 are GND; Pin 4–6 are IN. All six terminals must be soldered per Semtech's layout guidelines to achieve rated 40A surge performance - no thermal pad is required as energy is dissipated in the FET channel.
How does SMS24.TCT differ from standard TVS diodes in clamping behavior?
SMS24.TCT employs a triggered FET architecture instead of a PN junction. Its clamping voltage stays nearly constant (27.5–28V) from 24A to 40A and across –40°C to +125°C, unlike TVS diodes whose VC rises linearly with current and temperature. This is confirmed by TDS2211P datasheet Figure 3 and clamping vs. temperature plots on page 3.
Can SMS24.TCT be used to protect USB SuperSpeed (SS) differential pairs?
No - SMS24.TCT has 175pF junction capacitance, which would severely degrade signal integrity on USB 3.x/PCIe/DisplayPort lanes. For SS lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SMS24.TCT is intended only for VBUS, CC, SBU, or power-rail protection where bandwidth is not critical.
What is the maximum operating temperature and thermal derating profile for SMS24.TCT?
SMS24.TCT is rated for continuous operation from –40°C to +125°C ambient. Its clamping voltage shows negligible drift across this range (page 3, "Clamping Voltage vs. Temperature" plot), and peak pulse current capability remains stable - no thermal derating is required, unlike conventional TVS diodes whose IPP drops significantly above 85°C.
Is SMS24.TCT compliant with IEC 61000-4-5 for industrial surge immunity?
Yes - SMS24.TCT is rated for ±1kV (1.2/50μs voltage, 8/20μs current, RS = 42Ω) on unsymmetrical lines per IEC 61000-4-5, and supports 40A (8/20μs) surge current. This meets Level 4 immunity requirements for industrial equipment. The 1120W peak pulse power rating further validates its suitability for harsh electromagnetic environments.
SMS24.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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 350W
- 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-23-6
SMS24.TCT FAQ
1.How can I place an order for SMS24.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS24.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 SMS24.TCT reliable?
The price and inventory of SMS24.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS24.TCT is usually 5 days.
3.What payment methods are accepted for SMS24.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS24.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS24.TCT?
SMS24.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS24.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 SMS24.TCT?
For technical support, including SMS24.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS24.TCT requirements.
6.How does Aetrix verify that SMS24.TCT is sourced from the original manufacturer or authorized distributors?
All SMS24.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 SMS24.TCT meets industry standards.
7.What is the process for return or replacement of SMS24.TCT?
All SMS24.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMS24.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 SMS24.TCT part is unused and in its original packaging.
Return procedure for SMS24.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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