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Semtech Corporation SD12.TCT
- Part No.:
- SD12.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12.TCT.pdf
- Description:
- TVS DIODE 12VWM 25VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,362
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Product details
Overview
SD12.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, and 20mΩ dynamic resistance. It protects USB Type-C power delivery buses and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SD12.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for consistent voltage limiting, DFN-6 package layout compatibility, and suitability for 22V bus protection in USB PD and e-fuse input stages.
Technical Context
The SD12.TCT uses a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that senses overvoltage events and rapidly turns on the shunt path. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-across the full 24A to 40A rated peak pulse current range due to decreasing RDS(on).
It operates from −40°C to +125°C with stable clamping performance, exhibits only 175pF junction capacitance at 22V/1MHz, and maintains <600nA reverse leakage at VRWM. Its architecture enables reliable protection where thermal derating and voltage drift compromise standard TVS solutions.
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 24V-rated ICs (e.g., USB PD controllers, load switches) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness requirements without degradation. |
| Dynamic Resistance | 20mΩ - enables flat clamping response 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. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables compact placement near connectors with minimal PCB area and thermal mass. |
Pinout & Package
SD12.TCT is housed in a RoHS-compliant, halogen-free DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required-energy is dissipated via the FET channel, not junction heating. All six terminals are functional: three GND pins (1–3) and three IN pins (4–6), requiring parallel connection for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected with low-inductance vias to maximize current sharing and minimize impedance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); parallel connection ensures uniform current distribution and full 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A-eliminates need for oversized IPP margin to meet voltage thresholds. |
| Temperature-stable protection | Clamping remains 27.5–28V from −40°C to +125°C-enables reliable operation in uncooled industrial enclosures. |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot during 100A/μs dI/dt events-critical for protecting sensitive gate drivers and PMICs. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) supports repeated surges per IEC 61000-4-5 without parameter shift or wear-out. |
| DFN-6 layout efficiency | 1.6mm × 1.6mm footprint saves >60% board space vs. SOT-23 TVS alternatives while supporting same current rating. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C ports implementing USB PD 3.0, where controller ICs tolerate ≤24V absolute max. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or buck converter input. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents false OVP trips and ensures compliance with IEC 61000-4-2/4-5 without derating. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) exposed to lightning-induced surges in remote meters or robotics. IC Role / Device Role / Timing Role: Primary front-end EOS protector shunting surge energy before it reaches the switch's internal FET drain. Use Value: Limits voltage across load switch drain-source to <28V-below typical 30V breakdown, preventing latch-up or permanent gate oxide damage. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways subjected to ESD during field servicing or connector mating. IC Role / Device Role / Timing Role: Solid-state transient suppressor replacing Zener+TVS stacks on always-on power domains. Use Value: Delivers ±30kV ESD immunity with <600nA leakage-preserves battery life while enabling single-device surge compliance. |
Use Scenario: Protecting 22V supercapacitor or LiFePO₄ backup supplies in enterprise SSDs and NAS controllers against hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance (175pF), high-power clamp on backup supply input to prevent data corruption during power switchover. Use Value: 175pF capacitance avoids resonance with typical 10–100μF bulk caps-ensures stable regulation during transient recovery. |
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-SD12.TCT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference; used interchangeably in USB PD and industrial designs per Semtech's published cross-reference. | Select SD12.TCT when sourcing from Aetrix Electronics' certified Semtech channel-identical form, fit, and function. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A, higher clamping (+8V), no temperature stability, 500mΩ RDYN. | Requires 3× higher IPP rating to achieve comparable clamping; unsuitable for high-temp or tight-voltage-margin designs. | Only consider SMAJ22A if cost is primary constraint and design tolerates >35V clamping at elevated temperature. |
Compared with SMAJ22A, SD12.TCT delivers 8V lower clamping at rated current, stable performance across −40°C to +125°C, and 25× lower dynamic resistance-making it essential for 22V systems where voltage margin is ≤2V and ambient temperature exceeds 85°C.
Availability
SD12.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SD12.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, and signal integrity.
SD12.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace conventional TVS diodes in high-reliability 12–36V power rail protection where clamping stability, low dynamic resistance, and temperature insensitivity are critical.
FAQ
Is SD12.TCT a direct replacement for TDS2211P?
Yes, SD12.TCT is Semtech's alternate part marking for the identical TDS2211P device-same silicon, same DFN-6 package, same electrical specifications, and same qualification data. Both share identical datasheet Rev 2.5 and are fully interchangeable in design and procurement. SD12.TCT appears on Semtech's official tape-and-reel ordering matrix as a valid variant.
What is the maximum continuous operating voltage for SD12.TCT?
The maximum continuous operating voltage for SD12.TCT is 22V DC or RMS (VRWM), verified per IEC 61000-4-5 and confirmed in the Absolute Maximum Ratings table. Operation above 22V risks increased leakage current and potential degradation; it is rated for transient excursions only up to 28V clamping level.
Does SD12.TCT require a thermal pad on the PCB?
No, SD12.TCT does not require a thermal pad. Unlike TVS diodes that dissipate surge energy in the PN junction, SD12.TCT uses a low-RDS(on) FET to shunt current, dissipating energy primarily in the channel with negligible junction heating. The datasheet explicitly states "no thermal pad is needed" and recommends multiple low-inductance vias to ground instead.
Can SD12.TCT protect bidirectional signal lines like USB CC or DP/DM?
No, SD12.TCT is designed exclusively for unidirectional 22V power or I/O line protection (e.g., VBUS, load switch VIN). It is not rated for low-capacitance (<0.5pF) or bidirectional signal integrity applications. For CC/DP/DM lines, Semtech specifies RClamp3371ZC or uClamp2411ZA-devices optimized for sub-0.3pF capacitance and symmetrical clamping.
How does SD12.TCT's clamping performance compare to standard TVS diodes at high temperature?
At +125°C, SD12.TCT maintains 27.5–28V clamping across 24–40A, whereas standard TVS diodes (e.g., SMAJ22A) exhibit ≥35V clamping and significant derating-often exceeding safe limits for 24V-rated ICs. This stability stems from the FET-based architecture, which avoids the positive temperature coefficient of PN-junction breakdown voltage.
SD12.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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 15A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 150pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD12.TCT FAQ
1.How can I place an order for SD12.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12.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 SD12.TCT reliable?
The price and inventory of SD12.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12.TCT is usually 5 days.
3.What payment methods are accepted for SD12.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12.TCT?
SD12.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12.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 SD12.TCT?
For technical support, including SD12.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12.TCT requirements.
6.How does Aetrix verify that SD12.TCT is sourced from the original manufacturer or authorized distributors?
All SD12.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 SD12.TCT meets industry standards.
7.What is the process for return or replacement of SD12.TCT?
All SD12.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SD12.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 SD12.TCT part is unused and in its original packaging.
Return procedure for SD12.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12.TCT Tags
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