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Semtech Corporation SC431CS-.5 TRT
- Part No.:
- SC431CS-.5 TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SC431CS-.5 TRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,662
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Product details
Overview
SC431CS-.5 TRT 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, 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 SC431CS-.5 TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat voltage response, DFN-6 package layout constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SC431CS-.5 TRT 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 due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains stable clamping across temperature, and delivers 1120W peak pulse power (8/20μs). Its 175pF capacitance at 22V/1MHz and <600nA reverse leakage support high-speed interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - 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 |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB PD VBus protection without affecting power delivery regulation |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 ESD immunity for end-equipment compliance |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area |
Pinout & Package
SC431CS-.5 TRT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6 mm × 1.6 mm × 0.55 mm) with exposed thermal pad not required-energy is dissipated in the FET channel, not the junction.
| 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 clamping performance |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A-enables predictable protection margin without overdesign |
| Temperature-stable clamping | Clamps at ~27.5–28V from –40°C to +125°C-eliminates derating needed for TVS diodes at elevated ambient |
| Low dynamic resistance | 20mΩ measured between 1A–40A-reduces IR drop and sustains low clamping even under worst-case surge |
| High-energy surge rating | 1120W peak pulse power (8/20μs)-supports repeated lightning-surge events in industrial equipment |
| Ultra-low leakage | <600nA at 22V-prevents standby power loss in battery-powered IoT and portable devices |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20–22V VBus line in USB Type-C ports supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector to clamp surges before reaching the PD controller and power switches. Use Value: Maintains clamping at ≤28V across full temperature range and 40A surge-prevents latch-up or gate oxide damage in PD controllers rated for 30V absolute max. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Primary EOS protection device absorbing lightning-induced transients and inductive switching spikes on 24V supply rails. Use Value: Limits voltage seen by the load switch's internal FET to <28V-avoids overvoltage failure while enabling use of cost-optimized 30V-rated switches. |
| IoT Edge Device Power Bus Protection | Tablet/Notebook VBus Surge Suppression |
Use Scenario: Securing 22V auxiliary power rails in battery-backed smart sensors and gateway modules exposed to field ESD and coupling noise. IC Role / Device Role / Timing Role: Solid-state shunt protector replacing traditional TVS diodes where board space and thermal management are constrained. Use Value: 1.6×1.6mm footprint saves >50% area vs. SOD-323 TVS; stable clamping avoids false shutdowns during hot ambient operation. |
Use Scenario: Protecting main system VBus in thin-profile notebooks and tablets where USB-C charging coexists with high-speed data lanes. IC Role / Device Role / Timing Role: Dedicated high-current suppressor for power path only-decoupled from low-capacitance TVS used on SuperSpeed lines. Use Value: 175pF capacitance avoids interference with PD communication signaling while delivering 40A surge handling capability. |
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 code T22; differs only in reel quantity (3,000 pcs vs. SC431CS-.5 TRT's unspecified quantity). | Same use cases: USB PD, load switch, industrial 22V rail protection. | Select TDS2211P.C when standard Semtech reel packaging is preferred; SC431CS-.5 TRT may reflect alternate tape-and-reel configuration or distribution channel variant. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 33V clamping at 20A, smaller 0.65×0.65mm DFN-2 package, optimized for CC/SBU lines-not rated for 40A or VBus-level energy. | Designed for low-capacitance, low-current signal-line protection-not suitable for VBus or power rail duty. | Use uClamp2411ZA only for auxiliary control lines; SC431CS-.5 TRT remains mandatory for primary 22V power rail protection requiring 40A surge handling. |
Compared with TDS2211P.C, SC431CS-.5 TRT is functionally identical but may differ in packaging logistics; versus uClamp2411ZA, SC431CS-.5 TRT provides 2× peak current capacity, 5V lower clamping, and proven suitability for high-energy VBus protection-making it non-interchangeable for power-rail applications.
Availability
SC431CS-.5 TRT 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 with guaranteed surge immunity and compact DFN packaging.
Supply support for SC431CS-.5 TRT 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 semiconductors for high-performance protection, sensing, and signal integrity applications.
The SC431CS-.5 TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS environments where flat clamping, temperature stability, and FET-based surge handling are critical.
FAQ
What is the exact working voltage rating of the SC431CS-.5 TRT?
The SC431CS-.5 TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks voltages up to 22V DC or RMS in normal operation while remaining non-conductive. This rating aligns with USB PD 20V nominal + 10% tolerance and industrial 24V rail derating requirements. The SC431CS-.5 TRT begins clamping above 25V (VBR min) and holds to ≤28V under full 40A surge.
Does the SC431CS-.5 TRT require a thermal pad on the PCB?
No, the SC431CS-.5 TRT does not require a thermal pad. Unlike TVS diodes that dissipate surge energy in the PN junction, the SC431CS-.5 TRT uses a surge-rated FET whose channel conducts and dissipates energy with minimal junction heating. The datasheet explicitly states "no thermal pad is needed," and layout guidance emphasizes low-inductance GND vias instead of copper pour under the device.
How does the clamping performance of SC431CS-.5 TRT compare to standard TVS diodes at high temperature?
The SC431CS-.5 TRT clamps at ~27.5–28V from –40°C to +125°C, with negligible variation. In contrast, standard TVS diodes exhibit rising clamping voltage with temperature due to increased dynamic resistance-e.g., a typical 22V TVS may clamp at 38V at 125°C and 24A. This stability makes the SC431CS-.5 TRT ideal for automotive-adjacent or enclosed industrial environments where thermal derating would otherwise compromise protection margins.
Can SC431CS-.5 TRT be used on USB SuperSpeed differential pairs?
No, the SC431CS-.5 TRT is not suitable for USB SuperSpeed (TX/RX) or DisplayPort lines. Its 175pF junction capacitance would severely degrade signal integrity at multi-Gbps rates. For those lines, Semtech specifies low-capacitance devices like RClamp3371ZC (<0.25pF). The SC431CS-.5 TRT is intended exclusively for VBus, CC, SBU, or other single-ended power/signal lines where capacitance is less critical.
What is the recommended PCB layout for optimal surge performance of SC431CS-.5 TRT?
Place the SC431CS-.5 TRT as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid stubs or splits in GND paths-this minimizes parasitic inductance and ensures full 40A surge current is shunted effectively. The SC431CS-.5 TRT datasheet provides land pattern and via recommendations in Figure 7.
SC431CS-.5 TRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 130 µA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 150 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SC431CS-.5 TRT FAQ
1.How can I place an order for SC431CS-.5 TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431CS-.5 TRT 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 SC431CS-.5 TRT reliable?
The price and inventory of SC431CS-.5 TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431CS-.5 TRT is usually 5 days.
3.What payment methods are accepted for SC431CS-.5 TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431CS-.5 TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431CS-.5 TRT?
SC431CS-.5 TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431CS-.5 TRT 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 SC431CS-.5 TRT?
For technical support, including SC431CS-.5 TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431CS-.5 TRT requirements.
6.How does Aetrix verify that SC431CS-.5 TRT is sourced from the original manufacturer or authorized distributors?
All SC431CS-.5 TRT 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 SC431CS-.5 TRT meets industry standards.
7.What is the process for return or replacement of SC431CS-.5 TRT?
All SC431CS-.5 TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431CS-.5 TRT, 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 SC431CS-.5 TRT part is unused and in its original packaging.
Return procedure for SC431CS-.5 TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431CS-.5 TRT Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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