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Semtech Corporation SC185EULTRT
- Part No.:
- SC185EULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC185EULTRT.pdf
- Description:
- IC REG BUCK 1.2V 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:6,415
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Product details
Overview
SC185EULTRT 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), 27.5–28V clamping voltage at 24–40A, and 20mΩ dynamic resistance - enabling robust USB Type-C PD bus protection in industrial and portable electronics.
For engineers reviewing the SC185EULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for load-switch input and USB PD interface protection.
Technical Context
The SC185EULTRT 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 across 24–40A and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and 175pF junction capacitance at 22V/1MHz - optimized for low-impact integration into high-speed power rails without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off - matches USB PD 20V nominal + margin, prevents false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - stays below 30V damage threshold of common 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 automotive and industrial ESD requirements without external shielding. |
| Dynamic Resistance | 20mΩ (8/20μs, 1–40A range) - enables flat clamping curve and minimizes voltage overshoot during fast transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for DC power rail protection without affecting load-switch response or PD negotiation timing. |
Pinout & Package
SC185EULTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad-less construction; all six terminals are surface-mount, lead-free, and UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current - all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input - tied together to the VBUS or power rail; parallel connection ensures full 40A rating and uniform current distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C - eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) MOSFET - dissipates energy in channel rather than junction, improving reliability under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz bursts) - protects against switching noise in motor drives and SMPS-coupled systems. |
| Low leakage | 130–600nA at 22V - avoids quiescent current penalty in battery-backed IoT and always-on industrial sensors. |
Applications
| USB Type-C Power Delivery | Industrial Load-Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD profiles. IC Role / Device Role / Timing Role: Primary EOS suppressor placed between connector and PD controller or load switch. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to HS2950P or similar load switches during lightning-induced surges. |
Use Scenario: Safeguarding enable and input rails of programmable load switches in remote meters and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient shunt that clamps before internal FET gate oxide breakdown occurs. Use Value: 40A surge rating and 20mΩ dynamic resistance limit voltage rise to <30V - avoids OVP false trips and extends switch lifetime under repetitive EOS events. |
| IoT Edge Node Power Rails | Notebook/Tablet Battery Charging Circuits |
Use Scenario: Securing 22V-capable charging inputs in battery-powered gateways and sensor hubs exposed to field ESD. IC Role / Device Role / Timing Role: Standalone transient diverter on main DC input prior to buck converter or fuel-gauge IC. Use Value: ±30kV ESD rating and −40°C to +125°C operational range ensure compliance in uncontrolled environments without derating. |
Use Scenario: Protecting USB-C port VBUS routing on thin-client motherboards where space and thermal mass are constrained. IC Role / Device Role / Timing Role: Compact 1.6×1.6mm DFN suppressor co-located with connector to minimize trace inductance. Use Value: 175pF capacitance avoids interference with PD communication signaling while delivering 40A surge handling in minimal board area. |
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, same DFN-6 package, identical marking code T22 - confirmed pin-to-pin and functional replacement per Semtech documentation. | No change required; validated for USB PD, load switch, and industrial 22V rail use cases. | Select when sourcing from alternate Semtech channels or requiring documented second-source availability. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, and 0.25pF capacitance - optimized for CC/SBU data lines, not power rails. | Not suitable for VBUS protection; intended for low-capacitance signal-line ESD only. | Use only for auxiliary USB-C lines (CC, SBU); avoid for power-rail applications due to insufficient surge rating and elevated clamping. |
Compared with TDS2211P, SC185EULTRT offers identical performance and drop-in compatibility, while uClamp2411ZA serves a distinct low-capacitance signal-protection role - making it unsuitable as a direct replacement for 22V power-line suppression.
Availability
SC185EULTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load-switch inputs, and IoT edge-node power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC185EULTRT 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 sensing, protection, and signal integrity.
The SC185EULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-voltage, high-energy EOS applications where stable clamping and temperature resilience are critical.
FAQ
What is the maximum operating temperature range for SC185EULTRT?
The SC185EULTRT is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range - varying less than 0.5V from −40°C to +125°C at 40A surge - ensuring reliable protection in automotive under-hood, industrial control, and outdoor IoT deployments where thermal extremes occur.
Does SC185EULTRT require a thermal pad on the PCB?
No, SC185EULTRT does not require a thermal pad. The device dissipates surge energy through its low-RDS(on) FET channel rather than a PN junction, and its DFN-6 package is designed for direct copper pour connection to ground planes via pins 1–3. Semtech explicitly states no thermal pad is needed - energy is handled internally without reliance on external heat sinking.
Can SC185EULTRT be used to protect USB SuperSpeed differential pairs?
No, SC185EULTRT is not suitable for USB SuperSpeed (TX/RX) differential pair protection. With 175pF junction capacitance, it would severely degrade signal integrity at 10Gbps. For those lines, Semtech recommends ultra-low-capacitance devices like RClamp3371ZC (<0.25pF). SC185EULTRT is intended exclusively for VBUS, CC, or power-rail protection - not high-speed data paths.
How does SC185EULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes - whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN) - SC185EULTRT maintains near-constant clamping (27.5–28V) from 24A to 40A due to its FET-based shunt architecture. This eliminates the need for over-specifying IPP to meet voltage thresholds and ensures predictable protection across temperature and surge magnitude variations.
Is SC185EULTRT compatible with automated optical inspection (AOI) after reflow?
Yes, SC185EULTRT supports AOI. Its DFN-6 package features laser-marked "T22" identification and a visible dot indicator for Pin 1, both compliant with IPC-A-610 Class 2/3 visual inspection standards. The flat, coplanar leads and consistent solder wetting behavior enable reliable machine vision detection post-reflow without contrast enhancement or special lighting.
SC185EULTRT 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):
- 1.2V
- 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)
SC185EULTRT FAQ
1.How can I place an order for SC185EULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC185EULTRT 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 SC185EULTRT reliable?
The price and inventory of SC185EULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC185EULTRT is usually 5 days.
3.What payment methods are accepted for SC185EULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC185EULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC185EULTRT?
SC185EULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC185EULTRT 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 SC185EULTRT?
For technical support, including SC185EULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC185EULTRT requirements.
6.How does Aetrix verify that SC185EULTRT is sourced from the original manufacturer or authorized distributors?
All SC185EULTRT 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 SC185EULTRT meets industry standards.
7.What is the process for return or replacement of SC185EULTRT?
All SC185EULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC185EULTRT, 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 SC185EULTRT part is unused and in its original packaging.
Return procedure for SC185EULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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