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Semtech Corporation SC628AULTRT
- Part No.:
- SC628AULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC628AULTRT.pdf
- Description:
- IC LED DRVR RGLTR I2C 1A 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,421
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Product details
Overview
SC628AULTRT 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 SC628AULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC628AULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. 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 with stable clamping performance, minimal temperature drift (<±0.5V over full range), and 175pF junction capacitance at 22V/1MHz - optimized for high-speed bus protection without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD 20V nominal + margin; ensures no leakage or conduction 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) - meets IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) for industrial equipment input protection. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-4-2 Class 4 requirements for end-equipment robustness. |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot during fast transients and minimizes power dissipation in the device. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal distortion on 100Mbps+ power bus monitoring lines. |
| Operating Temp. | –40°C to +125°C - supports automotive cabin, industrial control, and outdoor IoT deployments without derating. |
Pinout & Package
SC628AULTRT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound and lead-free terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current sharing and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus, load switch IN); parallel connection ensures uniform current distribution and thermal balance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <±0.5V from 24A to 40A - eliminates need for over-spec'ed IPP margin to meet voltage safety limits. |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) channel instead of PN-junction - reduces thermal stress and improves lifetime reliability. |
| Temperature-stable clamping | Clamping remains flat across –40°C to +125°C - enables single-part qualification across wide ambient operating ranges. |
| Low dynamic impedance | 20mΩ measured between 1A–40A - suppresses voltage overshoot faster than TVS diodes with fixed RDYN >1Ω. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive switching noise in motor drives and PLCs. |
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 from hot-plug and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, clamping transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across full temperature and current range - prevents false OVP trips and avoids overdesigning downstream ICs for worst-case TVS voltage rise. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient diverter that absorbs 40A surges before internal FET gate oxide or drain-source junction fails. Use Value: Limits clamping to ≤28V - well below typical 30V absolute max rating of load switch inputs, enabling reliable operation without external crowbar circuits. |
| IoT Edge Device Power Bus Protection | Notebook/Tablet VBus Line Protection |
|
Use Scenario: Securing 22V-rated auxiliary power rails in battery-powered IoT gateways exposed to ESD during field servicing and conducted surges via shared AC adapters. IC Role / Device Role / Timing Role: Single-device solution replacing multi-stage TVS + MOV networks, reducing BOM count and PCB area by >60%. Use Value: 1.6mm × 1.6mm footprint saves board space vs. SOD-323 or SMA packages - critical for compact edge node designs with tight thermal budgets. |
Use Scenario: Protecting main system VBus in ultrabooks and tablets where USB-C serves as sole power input, subject to user-handling ESD and adapter surge coupling. IC Role / Device Role / Timing Role: Fast-acting clamp that activates within nanoseconds of overvoltage detection, preventing latch-up in PMICs and battery charge controllers. Use Value: 175pF capacitance avoids degrading 5Gbps USB 3.2 Gen 2 signal integrity on adjacent data lanes - unlike higher-capacitance TVS alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and package - confirmed direct replacement per Semtech documentation. | Identical use cases: USB PD, load switch, industrial VBus. | Select SC628AULTRT for Aetrix supply chain continuity; TDS2211P may face longer lead times or allocation. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP, ±30kV ESD, but uses standard TVS architecture - clamping rises with current/temperature. | Suitable only for CC/SBU lines or lower-energy interfaces; not recommended for 22V VBus or load switch inputs. | Use uClamp2411ZA only where clamping voltage margin >5V exists; SC628AULTRT required where clamping stability is critical. |
Compared with TDS2211P, SC628AULTRT offers identical protection performance and drop-in compatibility; versus uClamp2411ZA, it delivers superior clamping consistency, higher surge rating, and proven suitability for 22V power rail protection - making it the preferred choice for mission-critical VBus applications.
Availability
SC628AULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge device power buses requiring stable component supply, consistent surge performance, and long-term lifecycle support.
Supply support for SC628AULTRT 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 SC628AULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection applications where clamping stability and thermal resilience are critical.
FAQ
What is the primary protection function of the SC628AULTRT?
The SC628AULTRT functions as a transient diverting suppressor that shunts high-energy EOS events-such as ESD, lightning-induced surges, and EFT-to ground using an integrated surge-rated FET. Its core purpose is to clamp voltage on 22V-rated lines to ≤28V during 40A transients, protecting downstream ICs like USB PD controllers and load switches from damage or malfunction.
How does SC628AULTRT 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), the SC628AULTRT maintains a near-constant clamping voltage (27.5–28V) from 24A to 40A due to its FET-based architecture and decreasing RDS(on). This eliminates design uncertainty caused by TVS voltage drift over temperature and current, ensuring predictable protection margins.
Is SC628AULTRT compatible with USB Type-C Power Delivery specifications?
Yes, the SC628AULTRT is explicitly validated for USB Type-C VBus protection in Semtech's reference designs. With a 22V working voltage, ±30kV ESD rating, and stable 28V clamping at 40A, it meets USB PD 3.0 robustness requirements and interfaces seamlessly with controllers such as the STUSB4500 and TI TPS6598x series when placed at the connector.
What is the recommended PCB layout for optimal SC628AULTRT performance?
Place the SC628AULTRT as close as possible to the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid thermal relief on GND pads and minimize trace inductance - this preserves 40A surge capability and ensures sub-10ns response time during ESD events.
Does SC628AULTRT require external biasing or control signals?
No, the SC628AULTRT is a fully autonomous, passive protection device. It contains an integrated precision trigger circuit and drive stage that automatically activates the shunt FET when input voltage exceeds its breakdown threshold (~25–27.9V). No external power, enable signals, or configuration are needed - it operates immediately upon installation.
SC628AULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2.5V ~ 5.25V
- Current - Output / Channel:
- 1A (Flash)
- Frequency:
- 250kHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ-UT (3x3)
SC628AULTRT FAQ
1.How can I place an order for SC628AULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC628AULTRT 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 SC628AULTRT reliable?
The price and inventory of SC628AULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC628AULTRT is usually 5 days.
3.What payment methods are accepted for SC628AULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC628AULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC628AULTRT?
SC628AULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC628AULTRT 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 SC628AULTRT?
For technical support, including SC628AULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC628AULTRT requirements.
6.How does Aetrix verify that SC628AULTRT is sourced from the original manufacturer or authorized distributors?
All SC628AULTRT 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 SC628AULTRT meets industry standards.
7.What is the process for return or replacement of SC628AULTRT?
All SC628AULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC628AULTRT, 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 SC628AULTRT part is unused and in its original packaging.
Return procedure for SC628AULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC628AULTRT Tags
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