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Semtech Corporation SD12C.TCT
- Part No.:
- SD12C.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12C.TCT.pdf
- Description:
- TVS DIODE 12VWM 24VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,719
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Product details
Overview
SD12C.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 peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where stable clamping across temperature and current is critical.
For engineers reviewing the SD12C.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp FET-based architecture, DFN 1.6×1.6mm 6-lead package, 22V working voltage, and superior thermal stability versus conventional TVS diodes in USB PD, IoT, and industrial equipment designs.
Technical Context
The SD12C.TCT uses a surge-rated MOSFET as the primary shunt element, activated by an integrated precision trigger circuit that turns on the FET when transient voltage exceeds breakdown. This architecture delivers near-constant clamping voltage-27.5–28V across 24A to 40A-and maintains stability from −40°C to +125°C.
Unlike standard TVS diodes whose clamping rises linearly with current (VC = VBR + IPP × RDYN), the SD12C.TCT's low RDS(on) causes dynamic resistance to decrease under surge, fixing clamping close to the trigger circuit's reference voltage. Its 175pF junction capacitance at 22V/1MHz supports moderate-speed bus protection without signal integrity compromise.
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 conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements with 2Ω source impedance. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards without degradation. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during high-current transients, minimizing power dissipation and thermal stress. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power rails and low-to-moderate speed data lines (e.g., CC/SBU in USB-C), not high-speed SS lanes. |
Pinout & Package
SD12C.TCT is housed in a RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad-less construction and lead-free finish. The 6-lead layout supports high-current surge handling via parallel pin grouping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize inductance and maximize 40A capability. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping | Delivers flat 27.5–28V clamping across full 24–40A surge range, eliminating voltage rise seen in TVS diodes. |
| Temperature-stable protection | Clamping voltage varies <±0.5V from −40°C to +125°C, enabling reliable operation in uncontrolled industrial environments. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) supports repeated lightning-induced transients per IEC 61000-4-5. |
| Low-leakage design | 600nA max reverse leakage at 22V ensures minimal standby power loss in battery-backed or energy-sensitive systems. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C ports supporting up to 100W PD, exposed to ESD and system-level surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed at connector entry point to clamp overvoltage before reaching PD controller and multiplexer. Use Value: Maintains 27.5–28V clamping across temperature and current-well below typical PD controller absolute max ratings (e.g., 30V)-preventing latch-up or permanent damage. | Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and PLC I/O modules. IC Role / Device Role / Timing Role: Primary front-end EOS protector absorbing 40A surges while limiting voltage across internal FET gate oxide. Use Value: Prevents gate-oxide rupture and drain-source avalanche failure in load switches by holding clamping <28V-below common 30V FET VGS(max) limits. |
| IoT Edge Node Power Rail Protection | Storage Device DC Power Input Protection |
Use Scenario: Securing 12–22V DC input rails of battery-powered or PoE-powered IoT gateways and sensor hubs against EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Solid-state transient suppressor replacing bulkier TVS arrays, providing single-device 4kV EFT (IEC 61000-4-4) and ±30kV ESD immunity. Use Value: Enables compact 1.6×1.6mm footprint while delivering 20mΩ dynamic resistance-reducing voltage overshoot during fast 5/50ns EFT pulses. | Use Scenario: Protecting SATA or NVMe SSD power inputs (12V or 19V rails) from hot-plug transients, backfeed surges, and board-level ESD during handling. IC Role / Device Role / Timing Role: Standalone EOS protector on main power rail, coordinated with low-capacitance TVS on data lanes. Use Value: 175pF capacitance avoids resonance or filtering issues on DC rails, and 22V VRWM ensures no conduction during nominal operation or brownout conditions. |
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 1.6×1.6mm package, identical pinout and marking (T22 code), but differs only in tape-and-reel packaging quantity (3,000 vs. unspecified for SD12C.TCT). | Direct replacement in production; validated for USB-C, load switch, and industrial use per Semtech documentation. | Select TDS2211P.C when standardized reel size and traceability per Semtech ordering guidelines are required. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping, and smaller 1.0×1.0mm 2-pin SOD-523 package-no GND pin group or multi-pin surge sharing. | Suitable for CC/SBU lines in USB-C, not VBUS or power rails; lacks thermal and current-handling headroom for 40A surges. | Choose uClamp2411ZA only for low-capacitance, space-constrained auxiliary signal lines-not as a functional substitute for SD12C.TCT on power rails. |
Compared with TDS2211P.C, SD12C.TCT offers identical protection performance and pin compatibility but may differ in reel logistics; versus uClamp2411ZA, SD12C.TCT provides 67% higher surge current capacity, 2.5× lower clamping voltage at rated current, and dedicated ground pin architecture essential for industrial-grade power rail resilience.
Availability
SD12C.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and verified EOS protection performance.
Supply support for SD12C.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.
The SD12C.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability power rail protection where flat clamping, temperature stability, and high surge endurance are mandatory.
FAQ
What is the maximum continuous operating voltage for SD12C.TCT?
The SD12C.TCT has a reverse stand-off voltage (VRWM) of 22V, meaning it remains non-conductive and exhibits ≤600nA leakage up to this DC or RMS voltage. Exceeding 22V risks premature conduction and accelerated wear; it is not rated for sustained operation above this value, even if below the 27.9V breakdown threshold.
Does SD12C.TCT require a thermal pad on the PCB?
No, SD12C.TCT does not require a thermal pad. Its DFN 1.6×1.6mm package dissipates surge energy primarily through its low 20mΩ dynamic resistance and parallel ground pins (1–3), not junction-to-board conduction. Semtech explicitly states "no thermal pad is needed" in the datasheet, and layout guidelines emphasize multiple vias to ground instead of copper pour under the device.
Can SD12C.TCT protect high-speed USB SuperSpeed differential pairs?
No, SD12C.TCT is not suitable for USB SuperSpeed (TX/RX) lanes. Its 175pF junction capacitance would severely degrade signal integrity at 5+ Gbps. For those lines, Semtech specifies low-capacitance devices like RClamp3371ZC (<0.25pF). SD12C.TCT is intended exclusively for VBUS, CC, SBU, or other low-to-moderate speed power/sideband signals.
How does SD12C.TCT's clamping behavior differ from standard TVS diodes?
SD12C.TCT uses a triggered MOSFET shunt, yielding nearly constant 27.5–28V clamping from 24A to 40A and across −40°C to +125°C. Standard TVS diodes follow VC = VBR + IPP × RDYN, causing clamping to rise linearly with current and temperature-e.g., a 22V TVS may clamp at >38V at 125°C and 24A, risking IC damage where SD12C.TCT remains safe.
Is SD12C.TCT compatible with automated SMT assembly processes?
Yes, SD12C.TCT is fully compatible with standard SMT reflow processes. Its DFN 1.6×1.6mm package uses lead-free terminations, complies with RoHS/WEEE, and has a moisture sensitivity level (MSL) consistent with IPC/JEDEC J-STD-020. Semtech's recommended land pattern and layout guidelines ensure reliable solder joint formation without tombstoning or voiding.
SD12C.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 15A (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:
- SOD-323
SD12C.TCT FAQ
1.How can I place an order for SD12C.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12C.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 SD12C.TCT reliable?
The price and inventory of SD12C.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12C.TCT is usually 5 days.
3.What payment methods are accepted for SD12C.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12C.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12C.TCT?
SD12C.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12C.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 SD12C.TCT?
For technical support, including SD12C.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12C.TCT requirements.
6.How does Aetrix verify that SD12C.TCT is sourced from the original manufacturer or authorized distributors?
All SD12C.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 SD12C.TCT meets industry standards.
7.What is the process for return or replacement of SD12C.TCT?
All SD12C.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SD12C.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 SD12C.TCT part is unused and in its original packaging.
Return procedure for SD12C.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12C.TCT Tags
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