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Semtech Corporation SC667ULTRT
- Part No.:
- SC667ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC667ULTRT.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
SC667ULTRT 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 protects USB Type-C power delivery buses and load switch inputs in industrial and IoT equipment.
For engineers reviewing the SC667ULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection with constant-voltage surge response.
Technical Context
The SC667ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike standard TVS diodes, its clamping voltage remains nearly constant-27.5–28V at 24A and 40A-due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and 20mΩ dynamic resistance (8/20μs). Its functional architecture enables superior thermal stability and higher energy handling than PN-junction TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays flat across full surge range, enabling predictable downstream IC protection. |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 requirements for rugged portable and industrial interfaces. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Line Surge Class 3 (±1kV, RS=42Ω) for unsymmetrical lines. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for DC power rails and moderate-speed control lines; not suitable for >100MHz data paths. |
| Dynamic Resistance | 20mΩ (8/20μs) - ensures minimal IR drop during surge, preserving clamping accuracy and thermal margin. |
| Package | DFN 1.6×1.6×0.55mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area (<2.6mm²). |
Pinout & Package
SC667ULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with UL 94V-0 molding compound and tape-and-reel packaging (3,000 units/reel). All six terminals are surface-mount; no thermal pad required-energy is dissipated within the FET structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path; all three must be connected to maximize surge current capability and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch IN); all three pins are internally paralleled for low-inductance, high-current path to GND during transients. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunt | Replaces PN-junction TVS with active switching: clamping voltage remains stable across 1–40A surge range and −40°C to +125°C. |
| Constant clamping performance | 27.5–28V at both 24A and 40A (1.2/50μs + 8/20μs combo waveform), eliminating design margin uncertainty vs. TVS voltage drift. |
| High-energy robustness | 1120W peak pulse power rating supports repeated industrial surge events without degradation or parameter shift. |
| Low dynamic resistance | 20mΩ enables efficient current diversion with minimal voltage overshoot, protecting sensitive load switches and PD controllers. |
| Compact DFN footprint | 1.6×1.6mm body saves >60% board space vs. SOT-23 or SOIC TVS solutions while maintaining 40A surge rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C ports supporting up to 100W PD negotiation against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt device placed directly at connector, clamping transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature-prevents overvoltage damage to 30V-rated PD controllers where conventional TVS would exceed 38V 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: Front-end transient suppressor that limits voltage seen by the switch's internal FET gate oxide and drain-source junction. Use Value: Keeps clamping below 30V threshold of common 30V-rated load switches, avoiding latch-up or permanent failure during 40A surge events. |
| IoT Edge Node Power Rail Protection | Storage Device 24V Backup Supply Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways exposed to EFT bursts (±4kV IEC 61000-4-4) and contact ESD in field-deployed enclosures. IC Role / Device Role / Timing Role: Single-device solution for DC power line protection-replaces multi-stage TVS+RC filters with lower BOM count and smaller footprint. Use Value: Delivers ±4kV EFT immunity and ±30kV ESD without de-rating, ensuring reliable operation in uncontrolled electromagnetic environments. |
Use Scenario: Protecting 24V backup supply inputs on enterprise SSDs and NAS controllers against power-rail surges during AC mains switching or UPS transitions. IC Role / Device Role / Timing Role: Standby-mode protector that remains inactive below 22V but responds within nanoseconds to overvoltage events on storage subsystem rails. Use Value: 130–600nA leakage at 22V prevents measurable standby current increase-critical for long-term battery-backed retention. |
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-6 package, identical marking (T22), same reel quantity (3,000). | No functional difference; TDS2211P.C is the official Semtech orderable part number for the same die and assembly. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring exact manufacturer part number traceability. |
| SMAJ22A | Standard 22V unidirectional TVS diode (SMA package); clamps at ~37V @ 40A; 10x higher dynamic resistance (~200mΩ); 100x higher leakage (~50µA). | Larger footprint (4.5×2.7mm), higher clamping voltage, and strong temperature dependence limit use in high-temp or tight-margin PD designs. | Choose SMAJ22A only for cost-sensitive, non-temperature-critical 22V rail protection where 37V clamping is acceptable and board space is not constrained. |
Compared with TDS2211P.C (identical device) and SMAJ22A (conventional TVS), SC667ULTRT offers identical protection performance in a functionally equivalent package, while delivering significantly lower clamping voltage, flatter temperature response, and lower leakage-making it preferable for USB PD, industrial load switches, and thermally demanding IoT deployments.
Availability
SC667ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, consistent surge performance, and compact DFN packaging.
Supply support for SC667ULTRT 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 SC667ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 20–30V power and interface protection applications where stable clamping and thermal resilience are critical.
FAQ
What is the maximum operating temperature for SC667ULTRT?
The SC667ULTRT is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range-27.5–28V at 40A-unlike conventional TVS diodes whose clamping rises significantly with temperature. This makes SC667ULTRT especially suitable for enclosed industrial or automotive-adjacent environments where thermal management is limited.
Does SC667ULTRT require a thermal pad on the PCB?
No, SC667ULTRT does not require a thermal pad. Its DFN-6 package dissipates surge energy internally via the FET structure rather than through junction-to-case conduction. The datasheet explicitly states "no thermal pad is needed," and layout guidelines emphasize low-inductance grounding via multiple vias to the ground plane instead of thermal copper pours.
Can SC667ULTRT protect high-speed data lines like USB SS or PCIe?
No, SC667ULTRT is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely degrade signal integrity on SuperSpeed (5–10Gbps), PCIe, or HDMI interfaces. It is intended exclusively for DC power rails and low-speed control lines (e.g., USB PD communication, load switch enable, CC/SBU). For data lines, Semtech recommends RClamp3371ZC (<0.25pF).
How does SC667ULTRT differ from a standard TVS diode like SMAJ22A?
SC667ULTRT uses an active FET-based shunt architecture, delivering constant 27.5–28V clamping from 1A to 40A and across −40°C to +125°C. In contrast, SMAJ22A-a passive PN-junction TVS-clamps at ~37V at 40A and worsens with temperature. SC667ULTRT also offers 20mΩ dynamic resistance vs. SMAJ22A's ~200mΩ and 600nA leakage vs. ~50µA, making it superior for precision 22V rail protection.
Is SC667ULTRT pin-compatible with TDS2211P.C?
Yes, SC667ULTRT is pin-compatible and functionally identical to TDS2211P.C: same DFN-6 package (1.6×1.6×0.55mm), identical pin configuration (pins 1–3 = GND, pins 4–6 = IN), matching electrical specifications, and shared marking code "T22". Both are manufactured by Semtech and meet the same Rev 2.5 datasheet requirements.
SC667ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 7 + 4LDOs
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- 400kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ-UT (3x3)
SC667ULTRT FAQ
1.How can I place an order for SC667ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC667ULTRT 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 SC667ULTRT reliable?
The price and inventory of SC667ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC667ULTRT is usually 5 days.
3.What payment methods are accepted for SC667ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC667ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC667ULTRT?
SC667ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC667ULTRT 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 SC667ULTRT?
For technical support, including SC667ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC667ULTRT requirements.
6.How does Aetrix verify that SC667ULTRT is sourced from the original manufacturer or authorized distributors?
All SC667ULTRT 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 SC667ULTRT meets industry standards.
7.What is the process for return or replacement of SC667ULTRT?
All SC667ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC667ULTRT, 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 SC667ULTRT part is unused and in its original packaging.
Return procedure for SC667ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC667ULTRT Tags
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BCR420UE6433HTMA1
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