My Inquiry
My Account
Semtech Corporation SC185HULTRT
- Part No.:
- SC185HULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC185HULTRT.pdf
- Description:
- IC REG BUCK 1.5V 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC185HULTRT 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 bus overvoltage.
For engineers reviewing the SC185HULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (20mΩ), junction capacitance (175pF), and DFN 1.6×1.6mm package compatibility with high-density USB PD and industrial load switch layouts.
Technical Context
The SC185HULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing surge current.
It operates across –40°C to +125°C, maintains ≤600nA reverse leakage at 22V, and achieves 1120W peak pulse power handling. Its functional architecture enables robust protection for unsymmetrical lines per IEC 61000-4-5 (±1kV, 1.2/50μs, RS=42Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - Matches nominal USB PD bus voltage; ensures reliable operation without false triggering. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - Remains stable across temperature and current; stays below typical 29V PD controller damage threshold. |
| Peak Pulse Current | 40A (8/20μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - Exceeds automotive and industrial ESD requirements without derating. |
| Junction Capacitance | 175pF at 22V, 1MHz - Low enough for 22V power rail protection; avoids signal integrity issues on DC-biased lines. |
| Dynamic Resistance | 20mΩ (8/20μs) - Enables flat clamping curve; reduces voltage overshoot during fast-rising transients. |
Pinout & Package
SC185HULTRT 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). The package supports tape-and-reel delivery and features UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path; all three pins must be connected to maximize surge current dissipation and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input; connects directly to VBus or power rail; all three pins conduct surge current in parallel for 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables near-constant clamping voltage (27.5–28V) across 1–40A surge range-unlike TVS diodes whose VC rises linearly with IPP. |
| Low dynamic resistance | 20mΩ ensures minimal voltage rise during high di/dt events, critical for protecting sensitive 22V-rated load switches and PD controllers. |
| Wide temperature stability | Clamping voltage varies <±0.5V from –40°C to +125°C-enables reliable protection in uncontrolled industrial environments. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) supports repeated surge exposure in metering, robotics, and IoT edge nodes. |
Applications
| USB Type-C Power Delivery Input 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 suppressor placed between connector and PD controller or buck converter input. Use Value: Maintains clamping at 28V across full temperature range-prevents controller latch-up or gate oxide damage during hot-plug ESD or lightning-induced surges. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Prevents permanent degradation of load switch RDS(on) and OVP accuracy by holding transient voltage below 29V, even at 125°C ambient. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet Main Power Bus Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems, GNSS receivers, or battery charging ICs in outdoor gateways. IC Role / Device Role / Timing Role: Standalone transient suppressor on DC input before DC-DC regulation stage. Use Value: 40A surge capability and ±30kV ESD withstand ensure field reliability in ungrounded, cable-connected deployments subject to induced lightning currents. |
Use Scenario: Protecting 20V–22V system power buses feeding CPU VRMs or display power supplies in thin-and-light platforms. IC Role / Device Role / Timing Role: High-density, low-profile EOS guard for compact motherboard layouts where board space is constrained. Use Value: 1.6×1.6mm DFN footprint saves >60% area vs. SOT-23 TVS alternatives while delivering superior clamping consistency and thermal margin. |
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 1.6×1.6mm package, identical marking (T22); differs only in reel quantity (3,000 pcs vs. SC185HULTRT's unspecified quantity). | No functional difference; both qualified for USB PD and industrial use per same datasheet Rev 2.5. | Select TDS2211P.C if standard 7″ reel sizing and traceable date coding (XX) are required for production planning. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 32V clamping, smaller 0.6×0.6mm DFN package, optimized for CC/SBU lines-not rated for 40A bus protection. | Intended for low-capacitance data-line protection (e.g., USB-C CC pins), not power rail clamping. | Not suitable as direct replacement; use only for auxiliary signal lines where 22V bus-level surge immunity is not required. |
Compared with TDS2211P.C, SC185HULTRT shares identical performance and packaging but may differ in reel logistics or internal lot traceability; versus uClamp2411ZA, SC185HULTRT provides 2× higher surge current rating and 4V lower clamping-making it the sole viable option for 22V power rail EOS hardening.
Availability
SC185HULTRT 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 lifecycle support.
Supply support for SC185HULTRT 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 precision protection, sensing, and signal integrity.
SC185HULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and USB PD applications where clamping stability and temperature insensitivity are critical.
FAQ
What is the maximum operating temperature range for SC185HULTRT?
The SC185HULTRT is rated for continuous operation from –40°C to +125°C. Its clamping voltage remains stable within ±0.5V across this full range, and junction temperature can reach +150°C under surge conditions. This makes SC185HULTRT suitable for under-hood automotive accessories, industrial motor drives, and outdoor IoT enclosures where ambient extremes are common.
Does SC185HULTRT require a thermal pad or heatsink on the PCB?
No, SC185HULTRT does not require an external thermal pad or heatsink. Its DFN package dissipates surge energy internally via the FET channel, and the datasheet explicitly states "no thermal pad is needed." Layout best practice is to connect all GND pins (1–3) to a solid ground plane using multiple vias-this minimizes inductance and maximizes surge current handling without added thermal mass.
Can SC185HULTRT be used to protect bidirectional data lines like USB DP/DM?
No, SC185HULTRT is not suitable for bidirectional data lines such as USB DP/DM. It is a unidirectional suppressor designed for 22V power or single-ended I/O lines. For DP/DM protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), which preserve signal integrity. SC185HULTRT's 175pF capacitance and asymmetric structure make it inappropriate for high-speed differential signaling.
How does SC185HULTRT's clamping voltage compare to standard TVS diodes at 40A?
At 40A (8/20μs), SC185HULTRT clamps at 27.5–28V-significantly lower than typical 22V TVS diodes, which exceed 38V at the same current and 125°C. This 10V+ advantage stems from its FET-based architecture and 20mΩ dynamic resistance, enabling SC185HULTRT to protect downstream components that would otherwise fail under conventional TVS clamping.
Is SC185HULTRT compatible with lead-free reflow processes?
Yes, SC185HULTRT is fully compatible with standard lead-free reflow profiles (J-STD-020). Its DFN package uses lead-free terminal finish and UL 94V-0 molding compound, and it has been qualified for peak temperatures up to 260°C. The device meets RoHS and WEEE compliance requirements, and no special solder paste or profile adjustments are needed beyond IPC-A-610 Class 2/3 guidelines.
SC185HULTRT 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):
- 1.5V
- 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)
SC185HULTRT FAQ
1.How can I place an order for SC185HULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC185HULTRT 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 SC185HULTRT reliable?
The price and inventory of SC185HULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC185HULTRT is usually 5 days.
3.What payment methods are accepted for SC185HULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC185HULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC185HULTRT?
SC185HULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC185HULTRT 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 SC185HULTRT?
For technical support, including SC185HULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC185HULTRT requirements.
6.How does Aetrix verify that SC185HULTRT is sourced from the original manufacturer or authorized distributors?
All SC185HULTRT 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 SC185HULTRT meets industry standards.
7.What is the process for return or replacement of SC185HULTRT?
All SC185HULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC185HULTRT, 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 SC185HULTRT part is unused and in its original packaging.
Return procedure for SC185HULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC185HULTRT Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
