My Inquiry
My Account
Semtech Corporation SC431CSKQTRT
- Part No.:
- SC431CSKQTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431CSKQTRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC431CSKQTRT 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), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance - enabling robust protection in USB PD, Type-C, and industrial load-switch input circuits.
For engineers reviewing the SC431CSKQTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for 22V bus protection with constant-voltage surge response.
Technical Context
The SC431CSKQTRT 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 across 0–40A (8/20μs) due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with stable 27.5–28V clamping at rated current, 175pF junction capacitance at 22V/1MHz, and <600nA reverse leakage - making it suitable for high-speed, thermally demanding interfaces where voltage margin and thermal derating are critical.
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 surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD inputs. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and consumer ESD requirements without external shielding. |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot and minimal power dissipation during high-current transients. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with USB 2.0 and power-line signaling; not suitable for SuperSpeed USB 3.x data lanes. |
| Operating Temperature | −40°C to +125°C - supports operation in industrial enclosures and automotive under-hood environments. |
Pinout & Package
SC431CSKQTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required). All six terminals must be connected per layout guidelines to achieve full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to PCB ground plane via multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch input); all three pins are internally paralleled and must be tied together externally to connector. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A (8/20μs), eliminating thermal runaway risk seen in TVS diodes. |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot at 40A, reducing stress on downstream FETs and regulators. |
| High-temperature stability | Clamping remains 27.5–28V from −40°C to +125°C - no derating needed for industrial ambient conditions. |
| Ultra-low leakage | <600nA at 22V ensures minimal standby power loss in battery-backed or always-on IoT systems. |
| DFN-6 footprint | 1.6mm × 1.6mm area saves >60% board space vs. SO-8 TVS solutions while maintaining 1120W peak power handling. |
Applications
| USB Type-C Power Delivery | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C ports supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch. Use Value: Maintains 27.5–28V clamping across temperature and current range - prevents false OVP trips and ensures PD controller survival during ±1kV/42Ω surges. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor limiting voltage seen by internal FET gate oxide and drain-source junction. Use Value: Keeps clamping below 30V to avoid breakdown of 30V-rated load switch FETs, even at 125°C ambient. |
| IoT Edge Node Power Inputs | Notebook/Tablet VBUS Rails |
|
Use Scenario: Securing 22V-rated auxiliary power inputs in battery-powered industrial sensors and gateways. IC Role / Device Role / Timing Role: Single-device solution for ESD, EFT, and surge protection on unregulated DC inputs. Use Value: ±4kV EFT immunity and 40A surge rating meet IEC 61000-4-4/-5 for harsh factory-floor deployments. |
Use Scenario: Protecting main VBUS rail in ultraportable notebooks and tablets with USB-C charging. IC Role / Device Role / Timing Role: Compact, low-profile protector minimizing height impact on thin-form-factor PCBs. Use Value: 0.55mm profile and 1.6mm² footprint enable placement adjacent to USB-C receptacle without interfering with mechanical stack-up. |
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 and DFN-6 package; same marking code "T22" and tape/reel packaging (3,000 pcs/reel). | No functional difference - TDS2211P.C is the official Semtech orderable part number; SC431CSKQTRT is a valid alternate marking used in distribution channels. | Select TDS2211P.C for direct manufacturer sourcing; SC431CSKQTRT is fully interchangeable with identical traceability and qualification. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping, and 12pF capacitance - optimized for CC/SBU lines, not power rails. | Designed for low-capacitance signal-line protection; unsuitable for 22V VBUS due to insufficient IPP and elevated clamping. | Use only for auxiliary USB-C signals; not a replacement for SC431CSKQTRT in power-line roles. |
Compared with TDS2211P.C, SC431CSKQTRT is functionally identical and share full qualification - selection depends solely on supply chain availability. uClamp2411ZA serves distinct low-capacitance signal protection needs and cannot substitute for 22V power-rail surge suppression.
Availability
SC431CSKQTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load-switch inputs, and IoT edge-node power rails requiring stable component supply with guaranteed long-term continuity.
Supply support for SC431CSKQTRT 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 protection, sensing, and connectivity.
The TDS family - including SC431CSKQTRT - was engineered specifically for high-reliability EOS protection in 12–36V power interfaces where conventional TVS devices fail to maintain safe clamping margins across temperature and current extremes.
FAQ
What is the exact package type and dimensions of SC431CSKQTRT?
SC431CSKQTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, and pins 4–6 are IN. The land pattern follows Semtech's recommended layout with multiple ground vias and direct trace routing from connector to device.
Does SC431CSKQTRT require a thermal pad on the PCB?
No - SC431CSKQTRT does not require an external thermal pad. Its energy dissipation occurs through the FET channel during transient events, and the DFN package relies on low-inductance grounding (via pins 1–3) rather than thermal conduction. Layout guidelines emphasize ground-plane connection, not thermal mass.
Can SC431CSKQTRT replace standard TVS diodes in 22V applications?
Yes - SC431CSKQTRT replaces 22V TVS diodes in applications needing superior clamping stability. Unlike TVS diodes whose clamping rises linearly with current and temperature, SC431CSKQTRT maintains 27.5–28V clamping from −40°C to +125°C and 1–40A, offering tighter voltage margin for sensitive PD controllers.
What is the maximum allowable reverse leakage current for SC431CSKQTRT at 22V?
At VRWM = 22V and TA = 25°C, SC431CSKQTRT specifies a maximum reverse leakage current of 600nA. This value increases with temperature but remains below 1μA across the full −40°C to +125°C operating range, ensuring negligible impact on standby power in battery-powered systems.
Is SC431CSKQTRT compliant with RoHS and halogen-free standards?
Yes - SC431CSKQTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. The molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin, supporting lead-free reflow soldering profiles per J-STD-020.
SC431CSKQTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SC431CSKQTRT FAQ
1.How can I place an order for SC431CSKQTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431CSKQTRT 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 SC431CSKQTRT reliable?
The price and inventory of SC431CSKQTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431CSKQTRT is usually 5 days.
3.What payment methods are accepted for SC431CSKQTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431CSKQTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431CSKQTRT?
SC431CSKQTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431CSKQTRT 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 SC431CSKQTRT?
For technical support, including SC431CSKQTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431CSKQTRT requirements.
6.How does Aetrix verify that SC431CSKQTRT is sourced from the original manufacturer or authorized distributors?
All SC431CSKQTRT 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 SC431CSKQTRT meets industry standards.
7.What is the process for return or replacement of SC431CSKQTRT?
All SC431CSKQTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431CSKQTRT, 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 SC431CSKQTRT part is unused and in its original packaging.
Return procedure for SC431CSKQTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431CSKQTRT Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
