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Semtech Corporation SC189ZULTRT
- Part No.:
- SC189ZULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189ZULTRT.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,823
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Product details
Overview
SC189ZULTRT 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 stable 27.5–28V clamping across temperature and current range. Used in USB Type-C PD input protection to safeguard controllers from voltage overshoot.
For engineers reviewing the SC189ZULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, DFN-6 thermal performance at +125°C, low 20mΩ dynamic resistance, and compatibility with industrial load switch input protection layouts.
Technical Context
The SC189ZULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge - not fixed dynamic resistance.
It operates across –40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and UL 94V-0 molding compound. The device requires all six pins connected - three IN (pins 4–6) and three GND (pins 1–3) - for full 40A rating and minimal parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD bus nominal and withstand limits; avoids false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 24V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD endpoints. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Class 4 requirements; eliminates need for secondary ESD stages. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; reduces voltage rise per amp vs. TVS diodes with >1Ω RDYN. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power rails and low-speed signal lines; not intended for >100MHz data paths. |
Pinout & Package
SC189ZULTRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with wettable flanks. The package includes six terminals arranged in a 2×3 layout; all pins must be soldered for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must connect to solid ground plane via multiple vias to sustain 40A transient current. |
| Pins 4, 5, 6 | IN | Protected line input; tied together externally to minimize trace inductance; connects directly to connector or load switch VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A surge - prevents controller overvoltage even at max-rated transients. |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - eliminates derating calculations required for standard TVS diodes. |
| Ultra-low dynamic resistance | 20mΩ measured between 1A–40A - dissipates less heat than TVS devices with >1Ω RDYN under identical surge conditions. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - supports repeated surges without parametric shift or degradation. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS line in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch. Use Value: Maintains 28V clamping at full 40A surge and +125°C ambient - prevents latch-up or gate oxide rupture in downstream silicon. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor absorbing lightning-induced surges before they reach the switch's internal FET. Use Value: Keeps voltage across load switch VIN-to-GND below 30V during ±1kV IEC 61000-4-5 tests - avoids overvoltage failure mode. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet DC Input Protection |
|
Use Scenario: Securing 12–22V DC input on battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs on compact PCBs. Use Value: 1.6mm × 1.6mm footprint saves >60% board area vs. discrete TVS+series resistor solutions while improving reliability. |
Use Scenario: Protecting adapter-input rails in thin-client notebooks where thermal headroom and space are constrained. IC Role / Device Role / Timing Role: Standalone clamp on main DC input prior to buck converter or battery charger IC. Use Value: 175pF capacitance avoids affecting input filter stability; <600nA leakage minimizes standby current drain. |
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 code T22; differs only in reel quantity (3,000 vs. SC189ZULTRT's unspecified quantity). | No functional difference; both qualified for USB PD and industrial load switch use per Semtech documentation. | Select TDS2211P.C when standard 7″ tape-and-reel packaging is required; SC189ZULTRT may be alternate branding for same die. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 32V clamping at 20A, smaller 0.65mm × 0.65mm DFN-2 package. | Targeted at CC/SBU lines in USB-C; unsuitable for 40A VBUS protection due to lower surge rating and higher clamping. | Use uClamp2411ZA only for auxiliary signal lines; SC189ZULTRT is required for main power rail protection where 40A/28V performance is mandatory. |
Compared with TDS2211P.C, SC189ZULTRT offers identical protection performance and package; versus uClamp2411ZA, it provides 2× peak current capacity and 4V lower clamping - critical for preserving 24V-rated load switch integrity during surge events.
Availability
SC189ZULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply with guaranteed long-term availability.
Supply support for SC189ZULTRT 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 power management, protection, and signal integrity.
The SC189ZULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the maximum operating temperature for SC189ZULTRT?
The SC189ZULTRT is rated for continuous operation from –40°C to +125°C ambient. Its clamping voltage remains stable within 27.5–28V across this full range, unlike conventional TVS diodes whose clamping rises with temperature. This makes SC189ZULTRT suitable for under-hood automotive modules and industrial enclosures without thermal derating.
Does SC189ZULTRT require external bias or control signals?
No, SC189ZULTRT is a fully passive, self-triggering device. It contains an integrated precision trigger circuit and surge-rated FET - no external voltage, enable pin, or configuration is needed. The SC189ZULTRT activates automatically when transient voltage exceeds its breakdown threshold, making it drop-in compatible with existing TVS footprints requiring no firmware or layout changes.
Can SC189ZULTRT be used on high-speed data lines like USB SuperSpeed?
No, SC189ZULTRT is not suitable for USB 3.x SuperSpeed (5Gbps+) or PCIe lanes due to its 175pF junction capacitance, which would severely attenuate high-frequency signals. It is designed exclusively for DC power rails and low-speed control lines. For SuperSpeed protection, Semtech recommends RClamp3371ZC (<0.25pF), not SC189ZULTRT.
How does SC189ZULTRT compare to standard TVS diodes in surge response time?
SC189ZULTRT triggers in <1ns - comparable to fast silicon TVS diodes - but differs fundamentally in conduction behavior. While TVS diodes exhibit linear VC = VBR + IPP×RDYN, SC189ZULTRT's FET-based architecture achieves near-constant clamping because RDYN drops to 20mΩ under surge. This results in lower let-through energy for the protected IC compared to TVS devices with fixed ~1Ω RDYN.
Is SC189ZULTRT compliant with RoHS and halogen-free standards?
Yes, SC189ZULTRT is Pb-free, halogen-free, and compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and the lead finish is 100% matte tin. These compliance attributes are confirmed in Semtech's official datasheet Rev 2.5 and supported by material declarations available through authorized distributors.
SC189ZULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 3.3V
- 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)
SC189ZULTRT FAQ
1.How can I place an order for SC189ZULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189ZULTRT 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 SC189ZULTRT reliable?
The price and inventory of SC189ZULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189ZULTRT is usually 5 days.
3.What payment methods are accepted for SC189ZULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189ZULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189ZULTRT?
SC189ZULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189ZULTRT 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 SC189ZULTRT?
For technical support, including SC189ZULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189ZULTRT requirements.
6.How does Aetrix verify that SC189ZULTRT is sourced from the original manufacturer or authorized distributors?
All SC189ZULTRT 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 SC189ZULTRT meets industry standards.
7.What is the process for return or replacement of SC189ZULTRT?
All SC189ZULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189ZULTRT, 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 SC189ZULTRT part is unused and in its original packaging.
Return procedure for SC189ZULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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