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Semtech Corporation SR12.TCT
- Part No.:
- SR12.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
SR12.TCT.pdf
- Description:
- TVS DIODE 12VWM 31VC SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:9,096
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Product details
Overview
SR12.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 DFN 1.6×1.6×0.55mm 6-lead package. It protects USB Type-C power delivery buses and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SR12.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance (20mΩ), junction capacitance (175pF), and compatibility with 22V working voltage systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SR12.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 and across –40°C to +125°C due to decreasing RDS(on) under surge conditions.
It delivers 1120W peak pulse power (8/20μs), maintains <600nA reverse leakage at 22V, and achieves 175pF junction capacitance at 22V/1MHz-enabling use in high-speed bus protection where stable clamping and low parasitic capacitance are critical for signal integrity and controller survivability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage of protected line without device conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements with 2Ω source impedance. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal degradation on 22V power rails and moderate-speed control lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 system-level ESD immunity for exposed connectors. |
| Operating Temp | –40°C to +125°C - supports deployment in automotive-adjacent industrial and outdoor IoT environments. |
Pinout & Package
SR12.TCT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with UL 94V-0 molding compound. All six terminals are surface-mount; no thermal pad required. Pin 1 location marked by laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection ensures uniform current sharing and optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A and remains stable across –40°C to +125°C-eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Replaces traditional TVS junction with low-RDS(on) MOSFET, reducing energy dissipation in silicon and enabling higher surge endurance than PN-junction devices. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - directly enables sub-28V clamping even at full rated surge current. |
| High-energy rating | 1120W peak pulse power - supports repeated exposure to 40A surges without parametric shift or failure under standard test conditions. |
Applications
| USB Type-C Power Delivery Protection | Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles exposed to lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed adjacent to connector; clamps transients before they reach USB PD controller or power multiplexer. Use Value: Maintains 27.5–28V clamping across temperature and current-ensuring PD controller (e.g., FUSB302, TUSB7320) stays within absolute max ratings even at 125°C ambient. | Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P, TPS229xx) against EOS in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on internal FET gate oxide and drain-source junction during surge events. Use Value: Prevents latch-up or permanent damage to load switch by holding clamping voltage below 30V-well under typical 35V VDS(max) ratings. |
| Industrial 22V Bus Protection | IoT Device Power Rail Protection |
Use Scenario: Securing 22V auxiliary power rails in programmable logic controllers (PLCs) and motor drives subject to IEC 61000-4-5 surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input rail, replacing bulkier multi-stage TVS+MOV solutions. Use Value: Delivers 40A surge capability in 1.6×1.6mm footprint-reducing board area by >60% versus discrete TVS arrays while maintaining clamping consistency. | Use Scenario: Hardening battery-charged 22V supply lines in edge-node sensors and gateway devices deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Single-component overvoltage guard for PMIC input or battery management system (BMS) front-end. Use Value: Combines ±30kV ESD immunity and 4kV EFT tolerance (IEC 61000-4-4) to meet EN 61000-6-2 industrial immunity requirements without additional filtering. |
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), manufactured by Semtech. | No functional difference; TDS2211P.C is the official Semtech orderable part number for this device. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors for guaranteed traceability and lifecycle support. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping, no current-dependent flat response. | Lacks constant-clamp behavior-clamping rises with current and temperature; unsuitable where tight voltage margin exists. | Use SMAJ22A only in cost-sensitive, non-critical 22V lines where clamping up to 38V is acceptable and thermal derating can be accommodated. |
Compared with TDS2211P.C (identical device) and SMAJ22A (conventional TVS), SR12.TCT offers superior clamping stability and lower dynamic resistance-critical for protecting modern 24V-tolerant controllers without overdesigning surge margins or adding thermal derating overhead.
Availability
SR12.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial 22V bus protection, and IoT device power rail hardening requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SR12.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.
The TDS family-including SR12.TCT-is engineered specifically for high-energy Electrical Overstress (EOS) protection in 12–36V systems, emphasizing flat clamping, temperature stability, and compact packaging for next-generation USB, industrial, and IoT platforms.
FAQ
What is the maximum continuous operating voltage for SR12.TCT?
The SR12.TCT has a reverse stand-off voltage (VRWM) of 22V, meaning it remains non-conductive up to 22V DC or RMS. This makes SR12.TCT suitable for protecting 22V nominal power rails and USB-C VBUS lines operating up to 20V with headroom for ripple and tolerance. Exceeding 22V risks premature conduction and accelerated wear.
Does SR12.TCT require a thermal pad on the PCB?
No, SR12.TCT does not require a thermal pad. Its DFN 1.6×1.6mm package dissipates surge energy primarily through its low-RDS(on) FET structure rather than junction heating, and the datasheet explicitly states "no thermal pad is needed." Proper layout-using multiple vias to ground for pins 1–3 and short, wide traces to pins 4–6-is sufficient for reliable operation.
How does SR12.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), SR12.TCT maintains a nearly constant 27.5–28V clamping voltage from 24A to 40A and across –40°C to +125°C. This results from its FET-based shunt architecture and decreasing dynamic resistance under surge, eliminating thermal and current derating uncertainties inherent in PN-junction devices.
Can SR12.TCT protect high-speed data lines like USB SuperSpeed?
No, SR12.TCT is not intended for high-speed data lines. With 175pF junction capacitance, it is optimized for 22V power rails and moderate-speed control signals-not differential pairs carrying 5–10Gbps. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF). SR12.TCT should be used only on VBUS, CC, SBU, or load switch inputs.
Is SR12.TCT compatible with lead-free reflow soldering processes?
Yes, SR12.TCT is fully compatible with standard lead-free reflow profiles. It features Pb-free, halogen-free, RoHS/WEEE-compliant construction, a UL 94V-0 molding compound, and a lead finish rated for JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30°C/85% RH). The package withstands peak reflow temperatures up to 260°C per IPC/JEDEC J-STD-020.
SR12.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-253-4, TO-253AA
- Series:
- RailClamp®, SR
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 31V
- Current - Peak Pulse (10/1000µs):
- 16A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 5pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
SR12.TCT FAQ
1.How can I place an order for SR12.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SR12.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 SR12.TCT reliable?
The price and inventory of SR12.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR12.TCT is usually 5 days.
3.What payment methods are accepted for SR12.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR12.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR12.TCT?
SR12.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR12.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 SR12.TCT?
For technical support, including SR12.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR12.TCT requirements.
6.How does Aetrix verify that SR12.TCT is sourced from the original manufacturer or authorized distributors?
All SR12.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 SR12.TCT meets industry standards.
7.What is the process for return or replacement of SR12.TCT?
All SR12.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SR12.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 SR12.TCT part is unused and in its original packaging.
Return procedure for SR12.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR12.TCT Tags
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