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Semtech Corporation SC122ULTRT
- Part No.:
- SC122ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC122ULTRT.pdf
- Description:
- IC REG BOOST 3.3V 350MA 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,633
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Product details
Overview
SC122ULTRT from Semtech is a Transient Diverting Suppressor designed for high-energy EOS protection on 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 PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC122ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for minimal voltage overshoot, DFN-6 package integration for space-constrained USB Type-C and IoT designs, and compatibility with 22V bus architectures requiring robust surge resilience.
Technical Context
The SC122ULTRT 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 operates as a three-terminal shunt device: pins 4–6 serve as the protected input node, pins 1–3 as ground return, and its solid-state architecture eliminates junction heating limitations typical of avalanche diodes. The 175pF junction capacitance at 22V and 1MHz enables use on moderate-speed power rails without signal integrity compromise.
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 degradation |
| 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 |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds handheld ESD event severity for front-panel and connector interfaces |
| Dynamic Resistance | 20mΩ - minimizes voltage rise (ΔV = I × R) during fast transients, enabling tighter clamping than TVS diodes |
| Junction Capacitance | 175pF at 22V, 1MHz - suitable for DC power rails and low-to-moderate speed control lines; not for >100MHz data paths |
Pinout & Package
SC122ULTRT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals are surface-mount; pin 1 is marked by laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias for full 40A surge capability |
| Pins 4, 5, 6 | IN | Protected input node - connects directly to 22V bus (e.g., USB PD VBus); parallel connection increases current sharing and reduces trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage vs. current | 27.5–28V across full 24–40A range - eliminates need for overrating IPP to meet clamping targets, simplifying system-level surge margining |
| Stable clamping vs. temperature | No increase in VC from −40°C to +125°C - enables reliable protection in uncontrolled thermal environments (e.g., industrial enclosures) |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - withstands repetitive burst noise on power rails without degradation |
| Low dynamic resistance | 20mΩ - reduces transient-induced voltage overshoot by >50% compared to typical 100–200mΩ TVS devices at same IPP |
| DFN-6 footprint | 1.6mm × 1.6mm area - saves >60% board space versus SO-8 or SOT-23 alternatives while maintaining 1120W peak power handling |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation in notebooks and docking stations. IC Role / Device Role / Timing Role: Shunt-based transient suppressor placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 40A and 125°C, preventing damage to 24V-rated PD controllers where conventional TVS would exceed 35V at elevated temperature. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) against lightning-induced surges in remote metering or robotics systems. IC Role / Device Role / Timing Role: Primary front-end EOS protector on the VIN rail, upstream of overvoltage and current-limiting circuitry. Use Value: Limits voltage seen by the load switch's internal FET to ≤28V during 1.2/50μs + 8/20μs combination wave surges, avoiding gate oxide rupture or drain-source avalanche failure. |
| IoT Edge Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
|
Use Scenario: Securing the 22V auxiliary power input of battery-backed wireless sensors deployed outdoors or in factory floors. IC Role / Device Role / Timing Role: Single-point surge diverter on main DC input, coordinated with upstream fuse and downstream LDO. Use Value: Delivers ±30kV ESD and 40A surge protection in <2.6mm² footprint, enabling compact, ruggedized enclosure design without sacrificing reliability. |
Use Scenario: Protecting the 22V hold-up capacitor supply in enterprise SSDs or NAS enclosures during AC mains transients or hot-swap events. IC Role / Device Role / Timing Role: Clamping element on backup power rail feeding PMIC or flash controller power domains. Use Value: Prevents overvoltage latch-up in storage controllers by clamping transients to 28V with <20mΩ effective series impedance, minimizing energy injection into sensitive analog blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, pinout, and package; SC122ULTRT is Semtech's alternate marking for TDS2211P per official ordering documentation | Same use cases: USB PD, load switch, industrial 22V rails | Select SC122ULTRT for tape-and-reel procurement through Aetrix; TDS2211P may reflect legacy distributor stock or alternate packaging |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, smaller 0.65mm × 0.65mm DFN-2 package | Better suited for CC/SBU lines in USB Type-C; insufficient for 40A VBus protection | Use uClamp2411ZA only for auxiliary signal lines-not as direct replacement for SC122ULTRT on main power rails |
Compared with TDS2211P, SC122ULTRT offers identical performance and form factor as a manufacturer-authorized alternate marking; versus uClamp2411ZA, it delivers 2× peak current capacity and 5V lower clamping at rated surge, making it the sole viable option for 22V bus-level protection in high-reliability systems.
Availability
SC122ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge device power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/halogen-free compliance.
Supply support for SC122ULTRT 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.
SC122ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS applications where stable clamping across temperature and current is critical.
FAQ
What is the exact package type and dimensions of SC122ULTRT?
SC122ULTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad. Pin 1 is marked by a laser dot. The footprint matches JEDEC MO-229 standard for DFN1616-6, and land pattern recommendations are provided in Semtech's datasheet revision 2.5.
Does SC122ULTRT require a thermal pad on the PCB?
No, SC122ULTRT does not require a thermal pad. Its energy dissipation occurs within the silicon die during transient events, and the DFN package is designed for direct mounting without thermal vias or copper pour under the body. However, connecting all GND pins (1–3) to a solid ground plane via multiple vias is mandatory for 40A surge performance.
How does SC122ULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC122ULTRT maintains 27.5–28V clamping from 24A to 40A due to its FET-based architecture and sub-20mΩ dynamic resistance. This eliminates the need to overspecify IPP to meet voltage thresholds.
Can SC122ULTRT protect high-speed data lines like USB SuperSpeed?
No, SC122ULTRT is not suitable for USB SuperSpeed (5–10Gbps) differential pairs. Its 175pF junction capacitance would severely degrade signal integrity. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); SC122ULTRT is intended exclusively for 22V power or low-speed control rails.
Is SC122ULTRT compatible with lead-free reflow processes?
Yes, SC122ULTRT is fully compatible with standard lead-free reflow profiles (J-STD-020). Its Pb-free, halogen-free construction and UL 94V-0 molding compound meet IPC/JEDEC standards for peak temperatures up to 260°C, and the device has been qualified for MSL Level 1 handling.
SC122ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 1.6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD-UT (1.5x2)
SC122ULTRT FAQ
1.How can I place an order for SC122ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC122ULTRT 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 SC122ULTRT reliable?
The price and inventory of SC122ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC122ULTRT is usually 5 days.
3.What payment methods are accepted for SC122ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC122ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC122ULTRT?
SC122ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC122ULTRT 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 SC122ULTRT?
For technical support, including SC122ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC122ULTRT requirements.
6.How does Aetrix verify that SC122ULTRT is sourced from the original manufacturer or authorized distributors?
All SC122ULTRT 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 SC122ULTRT meets industry standards.
7.What is the process for return or replacement of SC122ULTRT?
All SC122ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC122ULTRT, 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 SC122ULTRT part is unused and in its original packaging.
Return procedure for SC122ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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