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Semtech Corporation SC189NULTRT
- Part No.:
- SC189NULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189NULTRT.pdf
- Description:
- IC REG BUCK 2V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
SC189NULTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and a stable 27.5–28V clamping voltage across temperature and current range. Used in USB Type-C PD input protection, it replaces conventional TVS diodes where low, flat clamping is critical.
For engineers reviewing the SC189NULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, thermal-stable clamping behavior, and direct alternatives for industrial, USB PD, and load-switch protection designs.
Technical Context
The SC189NULTRT uses a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that senses overvoltage events. Unlike standard TVS diodes, its clamping voltage remains nearly constant - not linearly increasing with IPP - due to the FET's decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with <20mΩ dynamic resistance, 175pF junction capacitance at 22V, and reverse leakage below 600nA. The device is rated for 1120W peak pulse power and meets IEC 61000-4-4 (±4kV EFT), -4-5 (±1kV unsymmetrical line surge), and -4-2 (±30kV contact/air) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage before triggering; matches USB PD 20V nominal + margin. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., load switches, PD controllers) remain below damage thresholds even at full surge. |
| Peak Pulse Current | 40A (8/20μs) - supports industrial surge immunity per IEC 61000-4-5 Level 3 (±1kV, RS = 42Ω). |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB Type-C ESD requirements and enables robust front-end protection. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
| Dynamic Resistance | 20mΩ - enables flat clamping by minimizing IR drop across protection element during high-current transients. |
Pinout & Package
SC189NULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. Thermal performance relies on low-inductance ground connection via all three GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize parasitic inductance and maximize 40A capability. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch input); parallel connection ensures uniform current sharing and optimal clamping stability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A (8/20μs), eliminating design margin inflation needed with conventional TVS. |
| Temperature-stable protection | Clamping remains ~27.6V from –40°C to +125°C - no derating required for high-temp industrial environments. |
| Low dynamic resistance | 20mΩ enables efficient energy shunting with minimal voltage overshoot during fast-rising surges (e.g., ESD). |
| High-energy surge rating | 1120W peak pulse power supports repeated exposure to 40A/8/20μs transients without degradation. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller/load switch. Use Value: Maintains 27.6V clamping at 125°C - prevents PD controller latch-up or gate oxide damage where conventional TVS would exceed 35V. |
Use Scenario: Safeguarding input terminals of e-fuse or load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on internal FETs during lightning-induced surges. Use Value: Enables use of lower-voltage-rated, cost-optimized load switches by holding clamp below their absolute maximum VDS. |
| IoT Edge Node Power Bus Protection | Notebook/Tablet DC Input Protection |
Use Scenario: Securing 12–22V DC input rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-device solution replacing multi-stage TVS+MOV networks for space-constrained edge nodes. Use Value: 1.6×1.6mm footprint saves >60% board area vs. discrete TVS+capacitor solutions while delivering superior clamping consistency. |
Use Scenario: Protecting adapter-input circuits in ultraportable notebooks accepting 20V GaN chargers. IC Role / Device Role / Timing Role: High-reliability surge suppressor co-located with input EMI filter and fuse. Use Value: Survives repeated ±30kV contact ESD events without parameter shift - critical for consumer device durability certification. |
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; SC189NULTRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | Same USB PD, load switch, and industrial 22V rail use cases; validated in identical reference designs. | Select SC189NULTRT when sourcing from Aetrix Electronics - same device, different reel marking; no design or layout changes required. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, ±30kV ESD, but uses silicon avalanche structure - exhibits rising clamping with current/temperature. | Suitable for CC/SBU lines or lower-energy 24V rails; not recommended for 40A surge or high-temp VBUS protection. | Choose uClamp2411ZA only for auxiliary lines where clamping stability is secondary to ultra-low capacitance (<0.5pF). |
Compared with TDS2211P (identical part) and uClamp2411ZA (lower-energy alternative), SC189NULTRT delivers unmatched clamping flatness and thermal stability for 22V high-surge applications - making it the preferred choice where consistent voltage limiting directly impacts system reliability and component lifetime.
Availability
SC189NULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load-switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SC189NULTRT 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 SC189NULTRT - was engineered to replace conventional TVS diodes in high-reliability 22V power rail protection, emphasizing flat clamping, thermal stability, and compact DFN packaging for modern USB and industrial interfaces.
FAQ
What is the exact function of SC189NULTRT in a circuit?
SC189NULTRT functions as a transient diverting suppressor that shunts high-energy EOS events (ESD, lightning surges, EFT) from protected 22V power or I/O lines to ground. It uses a precision-triggered FET to achieve near-constant clamping voltage - unlike TVS diodes - ensuring downstream ICs remain within safe operating voltage limits during transients.
Is SC189NULTRT pin-compatible with other Semtech TDS devices?
SC189NULTRT shares the same 6-pin DFN package and pin configuration (Pins 1–3 = GND, Pins 4–6 = IN) as TDS2211P and is electrically and mechanically identical. It is not pin-compatible with other TDS variants like TDS1211P (12V) or TDS3311P (33V), which differ in voltage rating and internal trigger thresholds.
What is the maximum operating temperature for SC189NULTRT?
SC189NULTRT is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range - measured at 27.6V at 40A even at +125°C - enabling deployment in harsh industrial and automotive under-hood environments.
Does SC189NULTRT require a thermal pad or heatsink?
No, SC189NULTRT does not require a thermal pad or external heatsink. Its energy dissipation occurs during short-duration transients (≤20μs), and the DFN-6 package relies on low-inductance PCB copper pour and multiple vias to ground for effective heat spreading - per Semtech's layout guidelines in the official datasheet.
Can SC189NULTRT protect high-speed data lines like USB SS or PCIe?
No, SC189NULTRT is not intended for high-speed data line protection due to its 175pF junction capacitance, which would severely degrade signal integrity. It is designed exclusively for 22V power rails or low-speed control lines. For USB SuperSpeed or DP/DM lines, Semtech recommends RClamp3371ZC (<0.25pF) instead.
SC189NULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD-UT (2x2)
SC189NULTRT FAQ
1.How can I place an order for SC189NULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189NULTRT 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 SC189NULTRT reliable?
The price and inventory of SC189NULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189NULTRT is usually 5 days.
3.What payment methods are accepted for SC189NULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189NULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189NULTRT?
SC189NULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189NULTRT 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 SC189NULTRT?
For technical support, including SC189NULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189NULTRT requirements.
6.How does Aetrix verify that SC189NULTRT is sourced from the original manufacturer or authorized distributors?
All SC189NULTRT 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 SC189NULTRT meets industry standards.
7.What is the process for return or replacement of SC189NULTRT?
All SC189NULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189NULTRT, 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 SC189NULTRT part is unused and in its original packaging.
Return procedure for SC189NULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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