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Semtech Corporation SC189TULTRT
- Part No.:
- SC189TULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189TULTRT.pdf
- Description:
- IC REG BUCK 2.5V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
SC189TULTRT 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 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the SC189TULTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specifications, DFN-6 package layout guidance, real-world clamping behavior across temperature and current, and validated alternatives for 22V EOS protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The SC189TULTRT uses a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that senses overvoltage events and rapidly turns on the shunt path. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V across 24A to 40A and −40°C to +125°C-due to the FET's collapsing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and ultra-low 175pF junction capacitance at 22V/1MHz, enabling use on high-speed power rails without signal integrity degradation. Its solid-state architecture eliminates thermal runaway risks associated with junction-based TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V VRWM: Maximum continuous DC operating voltage before clamping initiates. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs): Stable voltage limit during worst-case surge, protecting downstream ICs like USB PD controllers. |
| Peak Pulse Current | 40A (8/20μs): Withstands industrial-level surges per IEC 61000-4-5, including ±1kV combo-wave (1.2/50μs + 8/20μs). |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2): Full system-level ESD robustness without external staging. |
| Dynamic Resistance | 20mΩ: Enables low-voltage drop under surge, minimizing power dissipation and thermal stress. |
| Junction Capacitance | 175pF at 22V/1MHz: Low enough for 22V power rail protection without degrading transient response or noise coupling. |
| Operating Temperature | −40°C to +125°C: Fully specified clamping performance across full industrial range, no derating required. |
Pinout & Package
SC189TULTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals are surface-mount; pins 1–3 are internally connected GND, pins 4–6 are internally connected IN-requiring direct, low-inductance routing to protected line and ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Ground (GND) | Common return path for surge current; all three must be vias-connected to internal ground plane for full 40A capability. |
| 4, 5, 6 | Input (IN) | Protected line connection (e.g., VBus in USB PD); all three pins must be shorted externally to maximize current sharing and minimize parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C-enables reliable margin design without worst-case derating. |
| FET-based shunt protection | Replaces thermally limited PN-junction TVS with low-RDS(on) MOSFET, eliminating thermal runaway and enabling repeatable surge survival. |
| Low dynamic resistance | 20mΩ ensures <1V IR drop at 40A, reducing localized heating and allowing smaller PCB copper areas vs. TVS solutions. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz): Sustains repeated fast transients without parameter drift or failure. |
| DFN-6 space efficiency | 1.6mm × 1.6mm footprint saves >60% board area vs. SO-8 or SOT-23 TVS alternatives rated for equivalent surge energy. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBus lines in USB-C receptacles supporting up to 100W PD, exposed to ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt device placed adjacent to connector, clamping transients before they reach PD controller or power multiplexer. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents damage to 30V-rated PD controllers where traditional TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems subject to 40A surge events. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Keeps clamping voltage below 28V-well under typical 30–35V absolute maximum ratings of load switch inputs-ensuring long-term reliability without derating. |
| IoT Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed smart sensors and edge gateways deployed in uncontrolled environments with frequent ESD exposure. IC Role / Device Role / Timing Role: Single-component, low-capacitance protector for always-on power inputs, replacing multi-stage TVS+RC networks. Use Value: 175pF capacitance avoids filtering or bandwidth reduction on 22V rails, while ±30kV ESD rating eliminates need for secondary ESD staging. |
Use Scenario: Protecting 22V backup supplies in NVMe SSDs and enterprise storage controllers against surges induced by hot-swap connectors or shared chassis grounds. IC Role / Device Role / Timing Role: Fast-acting shunt clamp on VBackup input, ensuring data retention circuitry remains powered within safe voltage margins during transients. Use Value: Stable 27.5–28V clamping prevents brownout or latch-up in backup regulators and SRAM retention circuits during 40A surge events. |
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 | Identical electrical specs, same DFN-6 package, identical marking (T22), and identical Semtech qualification-functionally identical part with alternate reel packaging code. | No functional difference; used interchangeably in production where tape-and-reel logistics differ. | Select TDS2211P.C when sourcing from standard Semtech distribution channels requiring .C suffix; SC189TULTRT is functionally identical and pin-compatible. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP rating, higher 30V clamping, and 12pF capacitance-designed for CC/SBU lines, not main power rails. | Intended for low-voltage, low-capacitance data-line protection-not suitable for 22V bus protection due to insufficient surge rating and higher clamping. | Use uClamp2411ZA only for auxiliary USB-C lines (CC/SBU); SC189TULTRT remains required for VBus and load switch inputs demanding 40A/28V performance. |
Compared with TDS2211P.C (identical spec), SC189TULTRT offers identical protection performance and layout compatibility; versus uClamp2411ZA, SC189TULTRT provides 67% higher surge current rating and 2V lower clamping-critical for safeguarding 22V power infrastructure where voltage margin is constrained.
Availability
SC189TULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT device power rail protection requiring stable component supply, long-lifecycle support, and guaranteed surge performance across temperature extremes.
Supply support for SC189TULTRT 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 protection, sensing, and signal integrity applications.
The SC189TULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection with superior clamping stability and thermal resilience.
FAQ
What is the maximum continuous operating voltage for SC189TULTRT?
The SC189TULTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously withstand up to 22V DC or RMS without entering conduction. This makes SC189TULTRT ideal for protecting 20–22V USB PD power buses and industrial 24V nominal systems operating within derated margins.
How does SC189TULTRT achieve stable clamping voltage across temperature?
SC189TULTRT uses a surge-rated FET activated by a precision trigger circuit instead of a PN junction. As surge current rises, the FET's RDS(on) decreases, maintaining clamping near the trigger voltage (~27.5V) regardless of temperature-unlike TVS diodes whose clamping increases with ambient heat. This behavior is fully characterized from −40°C to +125°C for SC189TULTRT.
Can SC189TULTRT replace standard TVS diodes in existing 22V designs?
Yes-SC189TULTRT is a direct functional upgrade for 22V TVS diodes, offering identical 22V VRWM but with 27.5–28V clamping (vs. 35–40V for typical TVS) and 40A surge rating. Its DFN-6 footprint matches common TVS layouts, though SC189TULTRT requires all GND and IN pins to be shorted externally per datasheet layout guidelines.
What is the junction capacitance of SC189TULTRT and why does it matter?
SC189TULTRT exhibits 175pF junction capacitance at 22V and 1MHz. This low value prevents excessive filtering or signal distortion on 22V power rails, unlike higher-capacitance TVS devices (>500pF) that can cause instability in switching regulators or slow down transient response-making SC189TULTRT suitable for high-speed power delivery paths.
Is SC189TULTRT compliant with industrial surge immunity standards?
Yes-SC189TULTRT meets IEC 61000-4-5 Level 4 (±1kV, 1.2/50μs + 8/20μs combo wave, RS = 42Ω) and IEC 61000-4-4 EFT (±4kV), plus IEC 61000-4-2 ESD (±30kV contact/air). These certifications are explicitly validated in the official Semtech TDS2211P datasheet, which applies directly to SC189TULTRT as a variant.
SC189TULTRT 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):
- 2.5V
- 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)
SC189TULTRT FAQ
1.How can I place an order for SC189TULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189TULTRT 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 SC189TULTRT reliable?
The price and inventory of SC189TULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189TULTRT is usually 5 days.
3.What payment methods are accepted for SC189TULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189TULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189TULTRT?
SC189TULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189TULTRT 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 SC189TULTRT?
For technical support, including SC189TULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189TULTRT requirements.
6.How does Aetrix verify that SC189TULTRT is sourced from the original manufacturer or authorized distributors?
All SC189TULTRT 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 SC189TULTRT meets industry standards.
7.What is the process for return or replacement of SC189TULTRT?
All SC189TULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189TULTRT, 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 SC189TULTRT part is unused and in its original packaging.
Return procedure for SC189TULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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