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Semtech Corporation SC531ULTRT
- Part No.:
- SC531ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Gate Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
SC531ULTRT.pdf
- Description:
- IC GATE DRVR LOW-SIDE 28MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,592
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Product details
Overview
SC531ULTRT 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 24–40A, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC531ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for consistent voltage limiting, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC531ULTRT 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 a 22V reverse stand-off voltage and 25–27.9V breakdown, supports unsymmetrical line protection per IEC 61000-4-5 (±1kV, 1.2/50μs), and delivers 1120W peak pulse power. Its solid-state architecture avoids junction heating limitations typical of PN-junction TVS devices.
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 24–40A (1.2/50μs + 8/20μs combo wave, RS=2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds standard ESD immunity for hot-plug interfaces like USB Type-C. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables flat clamping response and minimizes voltage overshoot during fast transients. |
| Junction Capacitance | 175pF @ 22V, 1MHz - low enough for VBus protection without degrading power integrity or causing excessive filtering. |
Pinout & Package
SC531ULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; thermal performance relies on PCB copper area and multiple ground vias-not an exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); parallel connection ensures uniform current sharing and optimal 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A range and −40°C to +125°C - eliminates derating concerns in thermally demanding environments. |
| Surge-rated FET architecture | Replaces PN-junction TVS with low-RDS(on) shunt switch - reduces thermal stress and improves reliability vs. junction-limited diodes. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in industrial control and IoT edge nodes. |
| Low dynamic resistance | 20mΩ - limits voltage rise during fast-rising surges (e.g., lightning-induced transients), improving system-level robustness. |
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, exposed to ESD during mating/unmating and surge from shared power rails. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed adjacent to connector, clamping transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents overvoltage damage to sensitive 24V-tolerant PD ICs where traditional TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment subject to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end transient diverter that routes surge energy to ground before it stresses the load switch's internal FET gate oxide or drain-source junction. Use Value: Enables use of smaller, lower-cost load switches by holding clamping voltage well below their absolute maximum ratings (e.g., <30V), even at 40A/125°C. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed wireless sensors and gateways deployed outdoors or in electrically noisy environments. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input rail, coordinated with upstream fuse and downstream LDO/regulator. Use Value: Delivers 40A surge handling in 1.6×1.6mm footprint-reducing board space vs. discrete TVS+MOV solutions while maintaining IEC 61000-4-5 compliance. |
Use Scenario: Protecting 22V backup power inputs in NVMe SSDs and enterprise storage controllers against hot-swap transients and ESD during maintenance. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-leakage (≤600nA @ 22V) protector preserving signal integrity and standby current budget. Use Value: Prevents data corruption or latch-up in storage controllers by clamping surges within safe margin of 24V-rated interface ICs, with no capacitance-induced timing skew. |
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 tape-and-reel packaging (3,000/reel). | No functional difference; TDS2211P.C is the official Semtech orderable part number corresponding to SC531ULTRT. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring exact manufacturer part nomenclature. |
| uClamp2411ZA.TCT | 24V working voltage, ±30kV ESD, but lower 20A IPP (8/20μs), higher 30V clamping, and 12pF capacitance-optimized for CC/SBU lines, not VBus. | Designed for low-voltage, low-capacitance data-line protection (e.g., USB-C CC pins), not 22V power rail duty. | Use uClamp2411ZA.TCT only for auxiliary signal lines; not suitable as direct replacement for SC531ULTRT in VBus or load switch protection roles. |
Compared with SC531ULTRT, TDS2211P.C is functionally identical and interchangeable, whereas uClamp2411ZA.TCT serves a different voltage/capacitance class and cannot handle 40A surges or protect 22V power rails-making SC531ULTRT the sole fit for high-energy bus protection.
Availability
SC531ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SC531ULTRT 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, sensing, and connectivity.
SC531ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature resilience are critical.
FAQ
What is the maximum continuous operating voltage for SC531ULTRT?
The SC531ULTRT 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 SC531ULTRT suitable for protecting 20V USB PD VBus lines and other 22V-rated power rails where sustained voltage operation is required.
Does SC531ULTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC531ULTRT is rated for 40A peak pulse current (8/20μs) and ±1kV (1.2/50μs, RS=42Ω) per IEC 61000-4-5, satisfying Level 4 industrial surge immunity requirements. Its 27.5–28V clamping ensures protected circuits remain within safe operating limits during standardized surge events.
How does SC531ULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC531ULTRT uses a surge-rated FET to maintain near-constant clamping-27.5–28V from 24A to 40A and across −40°C to +125°C-due to decreasing RDS(on) under surge conditions.
What is the recommended PCB layout for SC531ULTRT?
Place SC531ULTRT as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace, and tie all three GND pins (1,2,3) directly to a solid ground plane using ≥3 thermal vias. Avoid stubs or splits-this minimizes parasitic inductance and ensures full 40A surge capability.
Is SC531ULTRT compatible with automated SMT assembly processes?
Yes, SC531ULTRT uses a standard DFN-6 package (1.6mm × 1.6mm × 0.55mm) with J-lead–free terminations and RoHS/WEEE compliance. It supports reflow soldering per IPC/JEDEC J-STD-020, and its marking (T22 + date code) is laser-etched for machine vision compatibility in high-volume manufacturing.
SC531ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- 3-Phase
- Number of Drivers:
- 3
- Gate Type:
- P-Channel MOSFET
- Voltage - Supply:
- 3.15V ~ 3.46V
- Logic Voltage - VIL, VIH:
- 0.8V, 2.1V
- Current - Peak Output (Source, Sink):
- 2A, 4A
- Input Type:
- Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 10ns, 5ns
- Operating Temperature:
- -40°C ~ 115°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-MLPQ-UT (4x4)
SC531ULTRT FAQ
1.How can I place an order for SC531ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC531ULTRT 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 SC531ULTRT reliable?
The price and inventory of SC531ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC531ULTRT is usually 5 days.
3.What payment methods are accepted for SC531ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC531ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC531ULTRT?
SC531ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC531ULTRT 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 SC531ULTRT?
For technical support, including SC531ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC531ULTRT requirements.
6.How does Aetrix verify that SC531ULTRT is sourced from the original manufacturer or authorized distributors?
All SC531ULTRT 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 SC531ULTRT meets industry standards.
7.What is the process for return or replacement of SC531ULTRT?
All SC531ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC531ULTRT, 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 SC531ULTRT part is unused and in its original packaging.
Return procedure for SC531ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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