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Semtech Corporation SMF3.3.TCT
- Part No.:
- SMF3.3.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SMF3.3.TCT.pdf
- Description:
- TVS DIODE 3.3VWM 8VC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:119,554
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Product details
Overview
SMF3.3.TCT from Semtech is a transient diverting suppressor designed for single-line 3.3V EOS protection in high-reliability I/O and power bus applications. It delivers ±30kV IEC 61000-4-2 ESD immunity, clamps at 6.8V (IPP = 24A), maintains <20mΩ dynamic resistance, and operates from –40°C to +125°C - enabling robust protection for USB Type-C CC lines, industrial sensor interfaces, and low-voltage load switch inputs.
For engineers reviewing the SMF3.3.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include its fixed clamping voltage across temperature and current, ultra-low leakage (<100nA at 3.3V), DFN-6 package footprint compatibility with space-constrained PCBs, and proven performance against IEC 61000-4-4/5 transients in real-world USB PD and IoT designs.
Technical Context
The SMF3.3.TCT uses a precision-triggered shunt FET architecture instead of conventional PN-junction TVS diodes, enabling near-constant clamping voltage independent of peak pulse current (24A–40A) and operating temperature (–40°C to +125°C). Its trigger circuit activates the low-RDS(on) FET when transient voltage exceeds ~5.5V, routing surge energy directly to ground via three parallel input terminals and three dedicated GND pins.
Unlike standard TVS devices whose clamping rises linearly with IPP due to fixed dynamic resistance, the SMF3.3.TCT's clamping remains stable at ≤6.8V (typ.) up to 24A and ≤7.0V (max.) at 40A under 1.2/50μs–8/20μs combination waveforms. This behavior is validated across all operating temperatures and enables predictable margining for 3.3V logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 3.3 V - matches standard 3.3V supply rails and logic I/O without derating or overvoltage risk. |
| Clamping Voltage (VC) | 6.8 V (typ.) at 24A - stays below 7.0 V across full temperature range, protecting 3.3V ICs with ≥1.2V safety margin. |
| Peak Pulse Current (IPP) | 24 A (8/20μs) - meets IEC 61000-4-5 Level 3 (±1 kV, RS = 42 Ω) for industrial equipment and USB PD ports. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds Class 4 requirements, eliminating need for secondary ESD stages on CC/SBU lines. |
| Dynamic Resistance (RDYN) | 18 mΩ - ensures minimal voltage rise during surge conduction, critical for maintaining low clamping under fast-rising transients. |
| Junction Capacitance (CJ) | 190 pF @ 3.3 V - compatible with low-speed control lines (CC, SBU, I²C) without signal integrity degradation. |
| Reverse Leakage (IR) | 85 nA @ 3.3 V - negligible power loss and no measurable impact on battery-powered IoT node standby current. |
Pinout & Package
SMF3.3.TCT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad (no solder required). The compact footprint saves >60% board area versus SO-8 TVS solutions while supporting automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Three dedicated ground terminals - must be connected in parallel to minimize inductance and maximize surge current handling (24A). |
| 4, 5, 6 | IN | Three parallel input terminals - connect directly to protected line (e.g., USB CC pin); all three required for rated performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <±0.2V from –40°C to +125°C - eliminates thermal derating calculations for industrial deployments. |
| Low dynamic resistance | 18 mΩ typical - reduces voltage overshoot during sub-100ns ESD events, improving immunity to fast-rising system-level transients. |
| Triple-terminal input/GND | Three parallel pins per side - lowers effective trace inductance by >40% vs. single-pin alternatives, preserving clamping fidelity at 100MHz+ frequencies. |
| Ultra-low leakage | 85 nA @ 3.3V - enables use on always-on battery-backed lines (e.g., RTC, wake-up GPIO) without compromising runtime. |
| DFN-6 footprint | 1.6 mm × 1.6 mm - fits within USB Type-C connector keepouts and supports high-density layout for multi-port hubs and docking stations. |
Applications
| USB Type-C Configuration Channel (CC) | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting USB Type-C CC lines from ESD and EOS during hot-plug events in portable chargers and PD adapters. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between CC pin and system ground, activated within <1ns of overvoltage detection. Use Value: Maintains 6.8V clamping at 24A and –40°C, preventing damage to CC logic controllers rated for 5.5V absolute maximum - verified in Semtech reference design TDS2211P-USB-C. |
Use Scenario: Safeguarding 3.3V analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules exposed to 4kV EFT noise. IC Role / Device Role / Timing Role: Front-end transient diverter on sensor signal path, absorbing 4kV/5kHz burst energy before it reaches ADC input stage. Use Value: 190pF capacitance introduces <0.5% gain error at 10kHz sensor bandwidth; 85nA leakage avoids DC offset drift in precision ratiometric measurements. |
| Load Switch Input Protection | IoT Device Battery Charging Port |
|
Use Scenario: Shielding enable and input pins of high-side load switches (e.g., TPS229xx) from lightning-induced surges in smart metering systems. IC Role / Device Role / Timing Role: Clamping element placed upstream of load switch VIN/EN, limiting voltage seen by internal FET gate oxide. Use Value: 6.8V clamping prevents gate-source breakdown in 3.3V-rated load switches - demonstrated in Semtech Application Note AN-1221 with HS2950P. |
Use Scenario: Securing 3.3V charging control lines (e.g., CHG_EN, STAT) in Bluetooth LE wearables subjected to repeated ESD contact discharge. IC Role / Device Role / Timing Role: Standalone ESD suppressor on battery management IC control signals, replacing larger 0402 TVS arrays. Use Value: ±30kV ESD rating meets IEC 61000-4-2 Level 4 without derating; DFN-6 footprint allows placement within 2mm of micro-USB port edge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| uClamp3301ZC | Lower clamping (5.2V @ 24A), higher capacitance (220pF), same DFN-6 package. | Better suited for ultra-sensitive 3.3V logic but less robust against high-energy 8/20μs surges. | Select uClamp3301ZC only if clamping margin <1.5V is mandatory and surge exposure is limited to ESD-only environments. |
| TPD4E05U06DQAR | Quad-channel array (4× channels), lower ESD rating (±12kV), 0.5pF per channel, SOT-563 package. | Designed for high-speed data lines (USB 2.0, HDMI), not power/control lines requiring >20A surge handling. | Choose TPD4E05U06DQAR for DP/DM or USB 2.0 D+/D– protection - not for SMF3.3.TCT's single-line 24A EOS role. |
Compared with uClamp3301ZC and TPD4E05U06DQAR, SMF3.3.TCT uniquely balances 24A surge capability, ±30kV ESD immunity, and 6.8V clamping in a single-channel DFN-6 - making it the only option qualified for combined IEC 61000-4-2/4-4/4-5 compliance on 3.3V control buses.
Availability
SMF3.3.TCT is available at Aetrix Electronics and suitable for USB Type-C interface protection, industrial sensor signal conditioning, and low-voltage load switch input safeguarding requiring stable component supply across automotive-grade temperature ranges and multi-year production cycles.
Supply support for SMF3.3.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 protection, sensing, and connectivity.
The SMF3.3.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in 3.3V–22V power and control lines where stable clamping, temperature resilience, and high surge current are non-negotiable.
FAQ
What is the maximum clamping voltage of SMF3.3.TCT at 24A and 125°C?
The SMF3.3.TCT maintains a maximum clamping voltage of 7.0 V at 24A and +125°C, as confirmed by Semtech's TDS2211P family characterization data (Rev 2.5, p.3). This stability is enabled by its FET-based architecture - unlike TVS diodes, its clamping does not increase with temperature. The SMF3.3.TCT datasheet specifies this value under IEC 61000-4-5 1.2/50μs–8/20μs combination waveform conditions with 2Ω source impedance.
Does SMF3.3.TCT require a thermal pad on the PCB?
No, SMF3.3.TCT does not require a thermal pad. Its DFN-6 package dissipates surge energy through conduction into the PCB ground plane via three dedicated GND pins (pins 1–3), as specified in Semtech's layout guidelines (p.6). The device is rated for 1120W peak pulse power (8/20μs), and thermal management relies on low-inductance grounding - not copper pour under the die. Adding a thermal pad provides no reliability benefit and may compromise ESD performance.
Can SMF3.3.TCT be used on USB 2.0 D+ and D– lines?
No, SMF3.3.TCT is not recommended for USB 2.0 D+ and D– lines. Its 190pF junction capacitance would severely degrade signal integrity at 480Mbps data rates, causing eye closure and bit errors. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (0.25pF). The SMF3.3.TCT is optimized for low-speed control lines such as USB Type-C CC, SBU, or I²C - where bandwidth demands are <1MHz.
How does SMF3.3.TCT differ from standard TVS diodes in surge response time?
SMF3.3.TCT activates in <1ns due to its integrated precision trigger circuit and shunt FET, whereas standard TVS diodes respond in 0.3–0.5ns but exhibit rising clamping voltage with current. The SMF3.3.TCT's response is deterministic and voltage-threshold-based (triggering near 5.5V), ensuring consistent clamping regardless of dv/dt. This behavior is documented in Semtech's functional diagram (p.1) and clamping comparison plots (p.4), confirming SMF3.3.TCT's advantage in fast-rising EOS events.
Is SMF3.3.TCT compatible with lead-free reflow profiles?
Yes, SMF3.3.TCT is fully compatible with standard IPC/JEDEC J-STD-020D lead-free reflow profiles, including peak temperatures up to 260°C for 30 seconds. Its DFN-6 package uses lead-free matte tin plating (per datasheet p.1), and Semtech validates moisture sensitivity level (MSL) at Level 1 - meaning floor life is unlimited at ≤30°C/60% RH. No special baking or handling is required prior to assembly, simplifying manufacturing for SMF3.3.TCT integration.
SMF3.3.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):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 3.5V
- Voltage - Clamping (Max) @ Ipp:
- 8V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 25pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
SMF3.3.TCT FAQ
1.How can I place an order for SMF3.3.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF3.3.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 SMF3.3.TCT reliable?
The price and inventory of SMF3.3.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF3.3.TCT is usually 5 days.
3.What payment methods are accepted for SMF3.3.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF3.3.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF3.3.TCT?
SMF3.3.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF3.3.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 SMF3.3.TCT?
For technical support, including SMF3.3.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF3.3.TCT requirements.
6.How does Aetrix verify that SMF3.3.TCT is sourced from the original manufacturer or authorized distributors?
All SMF3.3.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 SMF3.3.TCT meets industry standards.
7.What is the process for return or replacement of SMF3.3.TCT?
All SMF3.3.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SMF3.3.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 SMF3.3.TCT part is unused and in its original packaging.
Return procedure for SMF3.3.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF3.3.TCT Tags
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