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Semtech Corporation SC443ULTRT
- Part No.:
- SC443ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC443ULTRT.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,609
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Product details
Overview
SC443ULTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 22V voltage buses or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection and industrial load switch front-end surge suppression.
For engineers reviewing the SC443ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability across temperature and pulse current, low dynamic resistance (<20 mΩ), junction capacitance (175 pF @ 22V), and validated performance in ±1kV IEC 61000-4-5 unsymmetrical line surges with 42Ω source impedance.
Technical Context
The SC443ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C, maintains stable clamping over temperature (±0.3V variation), and delivers 1120W peak pulse power (8/20μs). Its 175pF junction capacitance and <600nA reverse leakage at 22V support integration into high-speed 22V bus interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage of protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 22V-rated ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity standards for connector-facing protection. |
| Dynamic Resistance | 20 mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175 pF @ 22V, 1MHz - compatible with USB PD VBUS monitoring and load switch enable paths, not superspeed data lines. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement adjacent to connectors with minimal PCB area (2.56 mm² footprint). |
Pinout & Package
SC443ULTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad (not electrically connected). Pin 1 is marked by laser dot; all pins must be soldered for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current - all three pins must be connected to solid ground plane via multiple vias to minimize inductance. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBUS or power rail; all three pins are internally paralleled and must be shorted externally for rated 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS with active clamping - eliminates linear VC = VBR + IPP×RDYN rise, enabling stable 27.5–28V clamping from 1A to 40A. |
| Temperature-stable clamping | Clamping voltage varies ≤0.3V across –40°C to +125°C - eliminates derating concerns in industrial or automotive under-hood environments. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated exposure to IEC 61000-4-5 ±1kV (RS=42Ω) surges without parametric shift. |
| Low leakage & capacitance | <600nA IR at 22V and 175pF CJ - prevents standby power loss and avoids signal distortion on 22V control/power rails. |
| DFN space optimization | 2.56 mm² footprint - reduces board area by >50% vs. SO-8 or SOT-23 alternatives while maintaining 40A surge capacity. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed between Type-C receptacle and PD controller/load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.5–28V clamping across temperature and 40A pulses - prevents false OVP trips and ensures PD controller survival where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Surge diverter placed upstream of load switch VIN pin to limit transient voltage below internal FET breakdown (typically <30V). Use Value: Enables use of cost-optimized 30V-rated load switches in 22V systems by holding clamped voltage 2–3V below their absolute max rating - eliminating need for higher-voltage, higher-RDS(on) alternatives. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways and edge AI nodes subjected to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main system power input, coordinated with upstream fuse and downstream LDOs. Use Value: Delivers 40A surge handling in <2.6 mm² area - allows compact, fanless enclosures without compromising surge immunity per IEC 61000-4-5 Level 3. |
Use Scenario: Protecting 22V backup or auxiliary rails in NVMe SSD enclosures and enterprise storage controllers exposed to hot-plug transients. IC Role / Device Role / Timing Role: VBUS protector on auxiliary power path feeding PMICs or flash memory power management circuits. Use Value: 175pF capacitance avoids resonance with typical 10–100μF bulk capacitors - prevents ringing during surge events that could corrupt storage controller state machines. |
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 pinout and marking (T22XX), manufactured by Semtech - direct second-source variant. | Same USB PD, load switch, and industrial 22V bus use cases; qualified for same reliability standards (JEDEC JESD22-A108, A114). | Select when requiring Semtech-authorized alternate sourcing with identical qualification and traceability. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping (≥38V @ 40A), no temperature stability, 3x larger SMC package. | Limited to lower-energy applications; unsuitable for 22V systems with tight clamping margins or wide-temperature operation. | Consider only for cost-sensitive, non-temperature-critical 22V protection where 35–40V clamping is acceptable and board space is unconstrained. |
Compared with TDS2211P.C, SC443ULTRT offers identical performance and form factor as a Semtech-qualified variant; versus SMAJ22A, it delivers 10V lower clamping, 20× lower dynamic resistance, and 70% smaller footprint - making it essential for modern 22V PD and industrial power rail protection where margin and space are critical.
Availability
SC443ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT edge node power buses, and storage device 22V auxiliary rails requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC443ULTRT 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.
The SC443ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family - engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection, delivering flat clamping and temperature-invariant surge response.
FAQ
What is the maximum continuous operating voltage for SC443ULTRT?
The SC443ULTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without significant leakage or conduction. This makes SC443ULTRT suitable for protecting 22V nominal power rails such as USB PD VBUS, industrial 24V-derived supplies, and storage device auxiliary voltages - provided transient clamping headroom (27.5–28V) is respected in downstream IC ratings.
How does SC443ULTRT achieve stable clamping voltage across temperature?
SC443ULTRT achieves stable clamping by using a surge-rated FET as the primary shunt element, activated via a precision trigger circuit. As surge current increases, the FET's RDS(on) decreases, counteracting voltage rise - resulting in clamping voltage variation of ≤0.3V from –40°C to +125°C. This behavior is fundamentally different from TVS diodes, whose clamping rises linearly with both current and temperature.
Can SC443ULTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No - SC443ULTRT is not intended for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on differential pairs operating above ~100MHz. SC443ULTRT is designed exclusively for 22V power or control lines (e.g., VBUS, load switch EN/VIN, CC lines). For USB SS/DP/DM lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
What is the recommended PCB layout for optimal SC443ULTRT surge performance?
Place SC443ULTRT as close as possible to the protected connector. Connect all three IN pins (4,5,6) with a single low-inductance trace to the incoming line, and tie all three GND pins (1,2,3) directly to a solid ground plane using ≥4 vias. Avoid stubs or splits in GND traces - parasitic inductance directly degrades clamping response and peak current handling.
Is SC443ULTRT compliant with RoHS and halogen-free standards?
Yes - SC443ULTRT is Pb-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin, ensuring compatibility with lead-free reflow processes and environmental compliance requirements for industrial and consumer products.
SC443ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 27V
- Voltage - Output:
- 42V
- Current - Output / Channel:
- 30mA
- Frequency:
- 800kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLPQ-UT (3x3)
SC443ULTRT FAQ
1.How can I place an order for SC443ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC443ULTRT 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 SC443ULTRT reliable?
The price and inventory of SC443ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC443ULTRT is usually 5 days.
3.What payment methods are accepted for SC443ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC443ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC443ULTRT?
SC443ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC443ULTRT 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 SC443ULTRT?
For technical support, including SC443ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC443ULTRT requirements.
6.How does Aetrix verify that SC443ULTRT is sourced from the original manufacturer or authorized distributors?
All SC443ULTRT 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 SC443ULTRT meets industry standards.
7.What is the process for return or replacement of SC443ULTRT?
All SC443ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC443ULTRT, 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 SC443ULTRT part is unused and in its original packaging.
Return procedure for SC443ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC443ULTRT Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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