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Semtech Corporation SMF12.TCT
- Part No.:
- SMF12.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SMF12.TCT.pdf
- Description:
- TVS DIODE 12VWM 25VC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
SMF12.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 ultra-low 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SMF12.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (−40°C to +125°C), DFN 1.6×1.6mm 6-lead package compatibility, low 175pF junction capacitance, and FET-based shunt architecture enabling constant-voltage clamping unlike conventional TVS diodes.
Technical Context
The SMF12.TCT uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and drives the FET into low-RDS(on) conduction. This architecture delivers near-constant clamping voltage independent of peak pulse current magnitude or operating temperature.
Unlike standard TVS diodes whose clamping voltage rises linearly with IPP (VC = VBR + IPP × RDYN), the SMF12.TCT maintains clamping at ~27.6–28V from 24A to 40A (1.2/50μs + 8/20μs combo wave) and across −40°C to +125°C - verified in typical characteristics curves and absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - supports continuous operation on 20V USB PD bus with 10% margin before clamping activation. |
| Clamping Voltage | 27.6–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures protected ICs (e.g., USB PD controllers) remain below 30V damage threshold. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Class 4 ESD immunity for external connectors. |
| Dynamic Resistance | 20mΩ - enables minimal voltage rise under surge, critical for maintaining low clamping across current range. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC power rails and low-speed I/O; not suitable for >100MHz signal lines. |
| Operating Temp | −40°C to +125°C - supports industrial and automotive under-hood ambient conditions without derating. |
Pinout & Package
SMF12.TCT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All pins must be connected: Pins 1–3 are GND; Pins 4–6 are IN (parallel-connected input terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | Ground | Low-inductance return path for surge current; all three must be vias-connected to ground plane for full 40A rating. |
| Pins 4, 5, 6 | Input / Protected Line | Parallel-connected anode-side terminals tied directly to VBus or line under protection; equal current sharing improves reliability. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables <28V clamping across full 24–40A surge range and −40°C to +125°C - eliminates thermal derating seen in TVS diodes. |
| Ultra-low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving clamping accuracy. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz bursts) - protects against repetitive switching noise in industrial motor controls. |
| Small-footprint DFN package | 1.6mm × 1.6mm area - saves >50% board space vs. SO-8 or SOT-23 TVS alternatives while supporting same surge rating. |
| Lead-free & halogen-free | UL 94V-0 molding compound - complies with RoHS/WEEE and supports lead-free reflow profiles up to 260°C. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20V VBus line of a USB Type-C port implementing USB PD 3.0, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary high-energy shunt suppressor placed at connector entry point, clamping transients before they reach the PD controller and buck-boost converter. Use Value: Maintains 27.6V clamping at 40A and 125°C - prevents overvoltage damage to sensitive PD ICs where conventional TVS would exceed 38V at same conditions. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) powering remote sensors or actuators in metering or robotics systems. IC Role / Device Role / Timing Role: Front-end EOS protector that limits voltage stress on the load switch's internal MOSFET during 1kV/42Ω surges per IEC 61000-4-5. Use Value: Clamps to ≤28V regardless of ambient temperature - avoids gate oxide breakdown in the load switch, extending field lifetime in uncontrolled environments. |
| IoT Device Power Rail Protection | Notebook/Tablet DC Input Protection |
Use Scenario: Securing the main 12–22V input rail of battery-powered IoT edge nodes deployed outdoors or in factory floors. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection - replaces multi-component TVS+MLV cascades. Use Value: Delivers ±30kV ESD, ±4kV EFT, and 40A surge capability in one 1.6×1.6mm footprint - reduces BOM count and layout complexity. |
Use Scenario: Protecting the DC-in jack and internal power management ICs in ultrabooks and tablets subjected to user-handling ESD and adapter surge events. IC Role / Device Role / Timing Role: High-reliability clamp positioned between barrel jack and buck converter input capacitor. Use Value: Stable 27.5–28V clamping ensures no overvoltage reaches PMIC even at full 125°C junction temperature - critical for thermal margin in thin form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping, no temperature stability. | Limited to lower-energy surges; clamping rises to >42V at 125°C - unsuitable for USB PD or high-temp industrial use. | Select only for cost-sensitive, low-surge applications where 35.5V clamping is acceptable and thermal derating is managed externally. |
| TPD2E001DRYR | Low-capacitance (1.5pF) dual-channel ESD protector; 22V VRWM, 28V VC @ 1A; rated only for ESD, not surge. | Designed for high-speed data lines (USB 2.0, HDMI); lacks 40A surge rating and IEC 61000-4-5 compliance. | Use alongside SMF12.TCT for data-line protection (e.g., CC/SBU), but never as standalone replacement for VBus surge duty. |
Compared with SMAJ22A and TPD2E001DRYR, the SMF12.TCT uniquely combines 40A surge handling, ±30kV ESD, and thermally stable sub-28V clamping - making it the only option for robust 22V rail protection in compact, high-reliability designs.
Availability
SMF12.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SMF12.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, protection, and signal integrity.
The SMF12.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-energy EOS applications where clamping voltage stability across temperature and current is mission-critical.
FAQ
What is the maximum continuous operating voltage for SMF12.TCT?
The SMF12.TCT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without clamping. This makes it ideal for 20V USB PD bus applications with 10% safety margin. Operation above 22V will initiate clamping, and sustained overvoltage may cause thermal stress or failure.
Does SMF12.TCT require a thermal pad on the PCB?
No, the SMF12.TCT does not require a thermal pad. Its DFN package dissipates surge energy internally via the silicon FET structure, not through conduction to the board. The datasheet explicitly states "no thermal pad is needed" - instead, low-inductance grounding of all three GND pins (1–3) via multiple vias is critical for achieving full 40A surge rating.
How does SMF12.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), the SMF12.TCT uses a triggered FET to maintain clamping at ~27.6–28V from 24A to 40A and across −40°C to +125°C. This eliminates thermal derating and ensures predictable protection margins in real-world operating conditions.
Can SMF12.TCT protect high-speed data lines like USB 3.x or PCIe?
No, the SMF12.TCT is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity above ~10MHz. It is intended exclusively for DC power rails and low-speed I/O (e.g., VBus, CC, SBU, load switch inputs). For data lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
Is SMF12.TCT compliant with RoHS and halogen-free standards?
Yes, the SMF12.TCT is fully RoHS/WEEE compliant and halogen-free. Its molding compound meets UL 94V-0 flammability rating, and the lead finish is lead-free. These attributes are confirmed in the mechanical characteristics section of the official Semtech TDS2211P datasheet (Rev 2.5, Nov 2021), which applies to SMF12.TCT as a variant within the same family.
SMF12.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- SMF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 200W
- 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:
- SC-70-5
SMF12.TCT FAQ
1.How can I place an order for SMF12.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12.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 SMF12.TCT reliable?
The price and inventory of SMF12.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF12.TCT is usually 5 days.
3.What payment methods are accepted for SMF12.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12.TCT?
SMF12.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12.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 SMF12.TCT?
For technical support, including SMF12.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12.TCT requirements.
6.How does Aetrix verify that SMF12.TCT is sourced from the original manufacturer or authorized distributors?
All SMF12.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 SMF12.TCT meets industry standards.
7.What is the process for return or replacement of SMF12.TCT?
All SMF12.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMF12.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 SMF12.TCT part is unused and in its original packaging.
Return procedure for SMF12.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12.TCT Tags
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