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Semtech Corporation SC185JULTRT
- Part No.:
- SC185JULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC185JULTRT.pdf
- Description:
- IC REG BUCK 1.8V 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,338
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Product details
Overview
SC185JULTRT from Semtech is a Transient Diverting Suppressor (TDS) 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 ultra-low 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC185JULTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature, and real-world use cases in USB Type-C and load switch input protection.
Technical Context
The SC185JULTRT 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.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz. Its 6-pin DFN (1.6×1.6×0.55mm) integrates three parallel IN terminals (pins 4–6) and three GND terminals (pins 1–3) to minimize parasitic inductance and maximize surge current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD VBus nominal and withstand limits, enabling direct placement on 20–22V power rails without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below typical 30V damage threshold of USB PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC requirements for connector-level ESD robustness. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting, minimizing voltage overshoot during fast transients. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power line protection; not intended for high-speed data lines. |
Pinout & Package
SC185JULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals must be connected: pins 1–3 serve as low-inductance ground return paths, and pins 4–6 form a parallel input node for the protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Three dedicated ground terminals - must be tied together and connected to PCB ground plane via multiple vias to minimize surge loop inductance. |
| 4, 5, 6 | IN | Parallel-connected input terminals - connect directly to protected bus (e.g., USB PD VBus); all three required for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping across current & temperature | 27.5–28V clamping maintained from 24A to 40A and –40°C to +125°C - eliminates thermal derating uncertainty in industrial deployments. |
| Surge-rated FET protection architecture | Replaces traditional TVS diodes with active shunt switching - achieves lower clamping than passive devices with same working voltage. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during sub-microsecond transients. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - supports repeated surge events without degradation in load switch or power rail protection. |
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 against lightning-induced surges and connector ESD. IC Role / Device Role / Timing Role: Transient Diverting Suppressor placed directly at the Type-C receptacle, clamping transients before they reach the PD controller or buck converter. Use Value: Maintains 27.5–28V clamping at full 40A surge - stays safely below 30V absolute maximum ratings of common PD controllers like TUSB73x or STUSB4500. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., ON Semiconductor NIS5132, TI TPS229xx) exposed to 1.2/50μs surges in remote metering or robotics. IC Role / Device Role / Timing Role: Primary front-end EOS protector on VIN rail, absorbing energy before it stresses the internal MOSFET gate oxide or drain-source junction. Use Value: Clamping stability over temperature prevents loss of protection margin at elevated ambient conditions (e.g., +85°C enclosures), unlike standard TVS diodes whose VC rises with TJ. |
| IoT Device Power Rail Protection | Notebook/Tablet VBus Line Protection |
|
Use Scenario: Securing the main 22V input rail of battery-powered IoT gateways operating in electrically noisy environments (e.g., smart building HVAC controllers). IC Role / Device Role / Timing Role: Single-component, space-efficient solution replacing multi-device TVS+MOV stacks - fits in <2.6mm² footprint. Use Value: 1.6×1.6mm DFN package saves >60% board area versus SO-8 TVS alternatives while delivering superior clamping performance. |
Use Scenario: Protecting the VBus line of ultraportable notebooks and tablets with USB-C charging, where layout space and thermal constraints limit protection options. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-leakage (≤600nA at 22V) protector that avoids loading the power rail during normal operation. Use Value: Reverse leakage remains stable across temperature - ensures no unintended discharge or standby current increase in battery-critical designs. |
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" - confirmed drop-in replacement per Semtech ordering documentation. | No functional difference; used interchangeably in USB PD reference designs and industrial schematics. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and date-code visibility. |
| SP1003-02HTG | TVS diode (not TDS architecture); 24V working voltage, 33.2V clamping at 30A, higher dynamic resistance (~150mΩ), 12pF capacitance. | Better suited for low-capacitance data-line protection; lacks constant-clamp behavior and thermal stability of SC185JULTRT. | Choose SP1003-02HTG only for secondary protection on low-voltage signal lines - not recommended as primary VBus protector where clamping voltage margin is critical. |
Compared with TDS2211P.C (identical function and form) and SP1003-02HTG (passive TVS with higher clamping and no thermal stability), SC185JULTRT delivers superior surge resilience for 22V power rails where consistent clamping and temperature-invariant performance are mandatory.
Availability
SC185JULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, full RoHS compliance, and long-term lifecycle support.
Supply support for SC185JULTRT 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 sensing, protection, and connectivity solutions.
SC185JULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection applications demanding stable clamping across temperature and current.
FAQ
What is the exact package type and dimensions of SC185JULTRT?
SC185JULTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, and pins 4–6 are the parallel IN terminals. The land pattern follows Semtech's recommended layout with multiple ground vias for low-inductance routing.
Does SC185JULTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC185JULTRT is rated for 40A peak pulse current (8/20μs waveform) and ±1kV (1.2/50μs voltage, 8/20μs current, RS = 42Ω) per IEC 61000-4-5, making it suitable for Level 4 industrial surge protection. Its clamping voltage remains ≤28V under these conditions - well within safety margins for 22V-rated downstream ICs.
How does SC185JULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC185JULTRT uses a triggered FET architecture that maintains near-constant clamping (27.5–28V) from 24A to 40A and across –40°C to +125°C - eliminating thermal derating and improving design predictability.
Can SC185JULTRT be used on high-speed data lines like USB SS or PCIe?
No - SC185JULTRT has 175pF junction capacitance at 22V, which is too high for SuperSpeed USB (≤0.3pF typical) or PCIe signaling. It is intended exclusively for DC power rail or low-frequency I/O protection. For data lines, Semtech recommends RClamp3371ZC (0.15pF) or similar low-capacitance TVS devices.
What is the maximum continuous reverse leakage current of SC185JULTRT at 22V?
SC185JULTRT specifies reverse leakage current (IR) of 130–600nA at VRWM = 22V and TA = 25°C. Leakage remains stable across temperature - ≤900nA even at +125°C - ensuring minimal impact on standby power in battery-operated devices using SC185JULTRT.
SC185JULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-UFQFN 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 4A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLPQ-UT (3x3)
SC185JULTRT FAQ
1.How can I place an order for SC185JULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC185JULTRT 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 SC185JULTRT reliable?
The price and inventory of SC185JULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC185JULTRT is usually 5 days.
3.What payment methods are accepted for SC185JULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC185JULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC185JULTRT?
SC185JULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC185JULTRT 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 SC185JULTRT?
For technical support, including SC185JULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC185JULTRT requirements.
6.How does Aetrix verify that SC185JULTRT is sourced from the original manufacturer or authorized distributors?
All SC185JULTRT 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 SC185JULTRT meets industry standards.
7.What is the process for return or replacement of SC185JULTRT?
All SC185JULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC185JULTRT, 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 SC185JULTRT part is unused and in its original packaging.
Return procedure for SC185JULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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