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Semtech Corporation SC620ULTRT
- Part No.:
- SC620ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC620ULTRT.pdf
- Description:
- IC LED DRIVER LINEAR 25MA 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:9,454
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Product details
Overview
SC620ULTRT 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 a stable 27.5–28V clamping voltage across temperature and current range. It is used in USB Type-C PD input protection to safeguard controllers from bus overvoltage events.
For engineers reviewing the SC620ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, low dynamic resistance (20mΩ), junction capacitance (175pF at 22V), and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB PD and industrial load-switch layouts.
Technical Context
The SC620ULTRT 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 - ~27.5–28V - from 24A to 40A and across –40°C to +125°C due to decreasing RDS(on) under surge.
It operates with reverse stand-off voltage (VRWM) of 22V, breakdown voltage (VBR) of 25–27.9V, and ultra-low dynamic resistance (20mΩ), enabling robust protection for unsymmetrical lines per IEC 61000-4-5 (±1kV, 1.2/50μs + 8/20μs combo wave, RS = 42Ω). Its 175pF junction capacitance supports USB PD bus-level protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream 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. |
| Junction Capacitance | 175pF @ 22V, 1MHz - low enough to avoid signal distortion on 20V USB PD VBUS, yet optimized for energy handling. |
| Dynamic Resistance | 20mΩ - enables flat clamping response; reduces voltage rise under increasing current, unlike TVS diodes with fixed RDYN. |
| Operating Temperature | –40°C to +125°C - supports operation in extended industrial and automotive under-hood environments. |
Pinout & Package
SC620ULTRT is housed in a RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required (energy dissipated in silicon). All pins must be connected: Pins 1–3 are GND; Pins 4–6 are IN (parallel-connected for full 40A rating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be soldered to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); connecting all three ensures rated 40A capability and optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A and –40°C to +125°C - eliminates derating uncertainty vs. TVS diodes. |
| Surge-rated FET protection core | Replaces pn-junction TVS with low-RDS(on) MOSFET switch - enables 20mΩ dynamic resistance and superior thermal stability. |
| High-energy EOS handling | Rated for 1120W peak pulse power (8/20μs) - protects against lightning-induced surges and system-level transients in industrial equipment. |
| Low-leakage design | 600nA max reverse leakage at 22V - prevents battery drain in always-on IoT and remote metering applications. |
| USB PD–optimized footprint | 1.6×1.6mm DFN matches layout constraints of compact Type-C receptacles - enables placement within 2mm of connector for minimal trace inductance. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the 20V–22V VBUS line of USB Type-C ports implementing Power Delivery negotiation against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at the connector, clamping transients before they reach the PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids overvoltage damage to 24V-tolerant PD controllers even at 125°C ambient. |
Use Scenario: Safeguarding the input of industrial-grade load switches (e.g., HS2950P) in robotics, remote meters, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch during 40A surge events, extending field reliability in harsh electrical environments. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways and edge sensors exposed to uncontrolled docking or field maintenance events. IC Role / Device Role / Timing Role: Standalone EOS guard for non-isolated DC inputs where space and leakage current are critical constraints. Use Value: 130–600nA leakage at 22V minimizes standby power loss; ±30kV ESD rating withstands repeated human-handling events in deployment. |
Use Scenario: Protecting 22V backup power inputs in enterprise SSDs and NVMe storage modules subject to hot-swap and rack-level surges. IC Role / Device Role / Timing Role: High-reliability clamping device placed upstream of PMICs and charge management ICs on 22V auxiliary rails. Use Value: Stable 28V clamping ensures no overvoltage stress on 30V-rated storage controller I/Os during 1.2/50μs + 8/20μs combo-wave transients. |
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 functional specification, same package, same marking code T22 - confirmed as direct manufacturer-equivalent part number. | Same use cases: USB PD, load switch, industrial 22V rail protection. | Select TDS2211P when sourcing from Semtech-authorized channels requiring exact datasheet alignment and traceable lot history. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping, smaller 0.65×0.65mm 2-pin SOD-323 package. | Better suited for CC/SBU lines in USB Type-C; insufficient for 40A VBUS protection due to lower surge rating. | Choose uClamp2411ZA only for low-capacitance, low-current auxiliary lines - not a functional replacement for SC620ULTRT on main power rails. |
Compared with TDS2211P, SC620ULTRT offers identical electrical and mechanical performance but may differ in tape-and-reel packaging or date-code labeling; compared with uClamp2411ZA, SC620ULTRT provides 67% higher surge current rating and 5V lower clamping - making it the sole viable option for 22V bus-level protection.
Availability
SC620ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load-switch interfaces, and IoT edge-node power rails requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SC620ULTRT 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 semiconductors for power management, protection, and signal integrity.
The SC620ULTRT 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 continuous operating voltage for SC620ULTRT?
The SC620ULTRT 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 SC620ULTRT ideal for protecting 20V USB PD VBUS lines and other 22V-rated industrial power rails where sustained voltage exposure occurs.
How does SC620ULTRT achieve stable clamping voltage across temperature and current?
SC620ULTRT uses a surge-rated FET activated by a precision trigger circuit instead of a standard pn-junction TVS. As surge current increases, the FET's RDS(on) decreases, maintaining clamping voltage near 27.5–28V from 24A to 40A and –40°C to +125°C - a key advantage over conventional TVS devices whose clamping rises linearly with current and temperature.
Can SC620ULTRT be used for USB Type-C superspeed data lines?
No - SC620ULTRT is not suitable for USB SuperSpeed (TX/RX) differential pairs due to its 175pF junction capacitance, which would degrade signal integrity. For those lines, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25pF). SC620ULTRT is intended exclusively for VBUS, CC, or SBU power/data lines where higher capacitance is acceptable.
What is the recommended PCB layout for optimal SC620ULTRT performance?
Place SC620ULTRT within 2mm of 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 pads - energy is dissipated internally. This minimizes parasitic inductance and ensures full 40A surge capability in SC620ULTRT.
Is SC620ULTRT RoHS and halogen-free compliant?
Yes - SC620ULTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and the lead finish is lead-free, supporting environmentally regulated industrial and consumer deployments without compliance risk.
SC620ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- 400kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLPQ-UT (3x3)
SC620ULTRT FAQ
1.How can I place an order for SC620ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC620ULTRT 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 SC620ULTRT reliable?
The price and inventory of SC620ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC620ULTRT is usually 5 days.
3.What payment methods are accepted for SC620ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC620ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC620ULTRT?
SC620ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC620ULTRT 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 SC620ULTRT?
For technical support, including SC620ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC620ULTRT requirements.
6.How does Aetrix verify that SC620ULTRT is sourced from the original manufacturer or authorized distributors?
All SC620ULTRT 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 SC620ULTRT meets industry standards.
7.What is the process for return or replacement of SC620ULTRT?
All SC620ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC620ULTRT, 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 SC620ULTRT part is unused and in its original packaging.
Return procedure for SC620ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC620ULTRT Tags
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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HV9910CLG-G
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