My Inquiry
My Account
Semtech Corporation SC185BULTRT
- Part No.:
- SC185BULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC185BULTRT.pdf
- Description:
- IC REG BUCK 1V 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,883
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC185BULTRT 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 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC185BULTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, temperature-stable clamping behavior, and real-world use cases in USB Type-C and industrial power rail protection.
Technical Context
The SC185BULTRT 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 (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with stable 27.5–28V clamping up to 125°C, 22V reverse stand-off voltage, 27.9V typical breakdown, and 175pF junction capacitance at 22V/1MHz - enabling robust protection without signal integrity compromise in high-speed power interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD 20V nominal bus with 2V margin, preventing false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 30V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) and industrial surge requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity requirements without derating. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under surge, enabling predictable low-clamp behavior independent of current magnitude. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid disrupting 20V DC bus stability while supporting fast transient response. |
Pinout & Package
SC185BULTRT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals must be connected per layout guidelines to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must be vias-connected to inner ground plane to minimize inductance and maximize surge current handling. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus); all three required to distribute surge current and reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping across current & temperature | 27.5–28V clamping maintained from −40°C to +125°C and 24–40A - eliminates thermal derating calculations required for standard TVS diodes. |
| FET-based shunt architecture | Surge-rated MOSFET triggered by precision circuit - enables sub-0.1Ω effective RDS(on), delivering lower clamping than Zener-based TVS at high currents. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - ensures linear, predictable voltage rise and avoids runaway clamping seen in junction-limited devices. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in motor drives and industrial control environments. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBus lines in USB Type-C ports supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, clamping transients before they reach PD controller or load switch. Use Value: Maintains 27.5–28V clamping at full 40A surge and 125°C - prevents overvoltage damage to 30V-rated PD controllers where standard TVS would exceed 35V. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient shunt that diverts surge energy away from the load switch's internal FET drain-source path. Use Value: Limits clamping to ≤28V across temperature - keeps stress below the 30V absolute maximum rating of common 30V load switches, avoiding catastrophic failure. |
| IoT Device Power Rail Protection | Notebook/Tablet VBus Line Protection |
|
Use Scenario: Securing 22V-capable power rails in battery-powered IoT gateways and edge sensors deployed in electrically noisy environments. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on main input rail, replacing multi-component TVS+filter designs. Use Value: 175pF capacitance and 22V working voltage enable direct placement without filtering trade-offs - preserves power-up timing and avoids voltage droop artifacts. |
Use Scenario: Protecting VBus routing in thin-profile notebooks and tablets where board space is constrained and thermal management is limited. IC Role / Device Role / Timing Role: Compact DFN-6 (1.6×1.6mm) suppressor mounted adjacent to USB-C receptacle to minimize trace length and inductive coupling. Use Value: 0.55mm profile and no thermal pad requirement simplify assembly and reduce layer count - critical for ultra-thin PCB stackups. |
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 as direct replacement per Semtech documentation. | Same USB PD, Type-C, and industrial load switch use cases; validated in reference designs including Figure 4 and Figure 5. | Select TDS2211P when sourcing from authorized Semtech channels; SC185BULTRT is a branded variant with identical die and test flow. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping at 24A, and 12pF capacitance - optimized for CC/SBU lines, not VBus. | Intended for low-voltage, low-capacitance data-line protection (CC, SBU), not 22V power rail clamping. | Not suitable as functional replacement for SC185BULTRT; use only for auxiliary signal lines where <0.5pF capacitance is mandatory. |
Compared with TDS2211P, SC185BULTRT offers identical protection performance and drop-in compatibility; versus uClamp2411ZA, it delivers 67% higher surge rating and 33% lower clamping voltage - making it the sole viable option for 22V power rail EOS suppression.
Availability
SC185BULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SC185BULTRT 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 signal integrity.
The SC185BULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered 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 SC185BULTRT?
SC185BULTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad (no internal thermal pad). Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern follows Semtech's recommended footprint in the TDS2211P datasheet Rev 2.5, page 8.
Does SC185BULTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC185BULTRT is rated for 40A peak pulse current (8/20μs), satisfying IEC 61000-4-5 Level 4 (±1kV, RS = 42Ω, CS = 0.5μF) for unsymmetrical lines. Its 27.5–28V clamping at 40A ensures downstream components remain within safe operating voltage limits during surge events.
How does SC185BULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC185BULTRT uses a triggered FET shunt that maintains 27.5–28V clamping from 24A to 40A and from −40°C to +125°C - eliminating thermal and current derating calculations required for Zener-based devices.
Can SC185BULTRT be used to protect USB Type-C CC lines?
No, SC185BULTRT is not suitable for CC line protection. Its 175pF capacitance and 22V working voltage are optimized for VBus power rail suppression. For CC/SBU lines, Semtech recommends uClamp2411ZA (12pF, 24V), which provides low-capacitance, low-voltage protection without signal distortion.
Is SC185BULTRT RoHS and halogen-free compliant?
Yes, SC185BULTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is matte tin - confirmed in the TDS2211P datasheet Rev 2.5, page 1.
SC185BULTRT 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):
- 1V
- 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)
SC185BULTRT FAQ
1.How can I place an order for SC185BULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC185BULTRT 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 SC185BULTRT reliable?
The price and inventory of SC185BULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC185BULTRT is usually 5 days.
3.What payment methods are accepted for SC185BULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC185BULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC185BULTRT?
SC185BULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC185BULTRT 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 SC185BULTRT?
For technical support, including SC185BULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC185BULTRT requirements.
6.How does Aetrix verify that SC185BULTRT is sourced from the original manufacturer or authorized distributors?
All SC185BULTRT 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 SC185BULTRT meets industry standards.
7.What is the process for return or replacement of SC185BULTRT?
All SC185BULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC185BULTRT, 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 SC185BULTRT part is unused and in its original packaging.
Return procedure for SC185BULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC185BULTRT 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 …
