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Semtech Corporation SMF05.TCT
- Part No.:
- SMF05.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SMF05.TCT.pdf
- Description:
- TVS DIODE 5VWM 12.5VC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,634
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Product details
Overview
SMF05.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), and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch inputs.
For engineers reviewing the SMF05.TCT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in high-reliability embedded systems.
Technical Context
The SMF05.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transients to ground. Unlike standard TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and maintains stable 27.5–28V clamping at both 24A and 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), enabling robust protection without thermal derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail operating margins. |
| Clamping Voltage | 27.5–28V at 40A - stays flat across full surge range, avoiding voltage overshoot into downstream ICs. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD test requirements. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during conduction, minimizing power dissipation and thermal stress. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power and low-speed signal line protection, not high-speed data lanes. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - saves >50% board area vs. SO-8 TVS, supports fine-pitch routing near connectors. |
Pinout & Package
SMF05.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required - energy is dissipated in the FET channel, not junction heating. All six terminals are electrically grouped: 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 - all three must be connected with low-inductance vias to maximize surge current handling. |
| 4, 5, 6 | IN | Protected line input - tied together to the VBUS or I/O trace; placement within 3mm of connector minimizes coupling. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables constant clamping voltage independent of surge amplitude or ambient temperature - eliminates thermal runaway risk. |
| 20mΩ dynamic resistance | Reduces voltage overshoot during fast-rising transients and lowers power dissipation versus TVS diodes with fixed RDYN. |
| 175pF junction capacitance | Preserves signal integrity on 22V power rails and low-speed control lines without filtering or bandwidth degradation. |
| ±30kV ESD immunity | Meets highest-tier IEC 61000-4-2 contact discharge requirement - suitable for handheld and field-deployed IoT devices. |
| DFN-6 footprint | Enables compact, high-density layouts near USB-C connectors or load switch inputs - no thermal pad needed. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, clamping surges before they reach the PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across –40°C to +125°C, preventing false overvoltage trips and ensuring reliable PD communication under thermal stress. |
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: Front-end EOS protector absorbing 40A surges from long cable runs or inductive switching, shielding internal FET gate oxide. Use Value: Prevents permanent damage to load switch input stages by limiting clamping voltage below 30V - well below typical 35V absolute max ratings. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed smart sensors and gateway nodes subject to EFT bursts and connector hot-plug transients. IC Role / Device Role / Timing Role: Single-device solution for unsymmetrical line protection, replacing multi-component TVS+RC networks. Use Value: Delivers ±4kV EFT immunity (IEC 61000-4-4) with minimal board space - critical for compact, sealed enclosures with limited heatsinking. |
Use Scenario: Protecting 22V supply inputs of NVMe SSD controllers and enterprise HDD backplanes against system-level surges during hot-swap events. IC Role / Device Role / Timing Role: High-energy transient clamp on primary power input, coordinated with low-capacitance TVS on data lanes (e.g., RClamp3371ZC). Use Value: Ensures uninterrupted operation during 1.2/50μs ±1kV surges (RS = 42Ω), meeting IEC 61000-4-5 compliance without derating. |
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 | Same die, identical electrical specs, same DFN-6 package - differs only in tape-and-reel packaging (3,000 pcs/reel vs. SMF05.TCT's unspecified quantity). | No functional difference; used interchangeably in production where reel size or logistics align. | Select TDS2211P.C when standardized 7″ reels and traceable date coding (XX format) are required for SMT line compatibility. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping, smaller 0.65 × 0.65 mm DFN-2 package - optimized for CC/SBU lines, not main VBUS. | Designed for low-capacitance (<0.5pF), low-current signal line protection - insufficient for 40A power rail surges. | Use uClamp2411ZA only for auxiliary control lines; SMF05.TCT remains mandatory for primary 22V bus protection. |
Compared with TDS2211P.C, SMF05.TCT offers identical protection performance but may differ in packaging logistics; versus uClamp2411ZA, SMF05.TCT provides 67% higher surge current capability and 2.5V lower clamping - making it the sole qualified choice for 22V power rail EOS hardening.
Availability
SMF05.TCT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF05.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 connectivity solutions.
The SMF05.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the clamping voltage behavior of SMF05.TCT under varying surge currents?
The SMF05.TCT maintains a tightly regulated clamping voltage of 27.5–28V across its full rated peak pulse current range (24A to 40A, 1.2/50μs + 8/20μs combination waveform). This stability results from its FET-based architecture and ultra-low 20mΩ dynamic resistance - unlike TVS diodes whose clamping rises linearly with current. SMF05.TCT's design ensures predictable protection margins regardless of surge magnitude.
Can SMF05.TCT be used on high-speed data lines like USB SuperSpeed or PCIe?
No - SMF05.TCT is not suitable for high-speed data lines due to its 175pF junction capacitance, which would severely degrade signal integrity above ~100MHz. It is intended exclusively for 22V power rails and low-speed control signals. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), used alongside SMF05.TCT in coordinated protection schemes.
How does SMF05.TCT compare to standard TVS diodes in temperature performance?
SMF05.TCT clamping voltage remains stable from –40°C to +125°C, whereas conventional TVS diodes exhibit rising clamping with temperature due to increasing dynamic resistance and junction voltage drift. At 125°C, a typical 22V TVS may clamp at ~38V at 24A, while SMF05.TCT holds at ≤28V - a 10V margin advantage critical for protecting modern low-voltage-tolerant PD controllers.
What PCB layout practices maximize SMF05.TCT's surge performance?
To achieve full 40A rating, connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) to a solid ground plane using ≥3 low-inductance vias. Place SMF05.TCT within 3mm of the connector, avoid stubs or bends, and ensure no other traces run beneath the device. No thermal pad is required - energy is dissipated in the FET channel, not the silicon junction.
Is SMF05.TCT compliant with RoHS and halogen-free standards?
Yes - SMF05.TCT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free. Marking includes "T22" code and date code per Semtech's standard DFN-6 labeling convention, confirming full environmental compliance for industrial and consumer deployments.
SMF05.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):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 12.5V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 200W
- 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:
- SC-70-5
SMF05.TCT FAQ
1.How can I place an order for SMF05.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF05.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 SMF05.TCT reliable?
The price and inventory of SMF05.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF05.TCT is usually 5 days.
3.What payment methods are accepted for SMF05.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF05.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF05.TCT?
SMF05.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF05.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 SMF05.TCT?
For technical support, including SMF05.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF05.TCT requirements.
6.How does Aetrix verify that SMF05.TCT is sourced from the original manufacturer or authorized distributors?
All SMF05.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 SMF05.TCT meets industry standards.
7.What is the process for return or replacement of SMF05.TCT?
All SMF05.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMF05.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 SMF05.TCT part is unused and in its original packaging.
Return procedure for SMF05.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF05.TCT Tags
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