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Semtech Corporation SC431LCSK-2TR
- Part No.:
- SC431LCSK-2TR
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-2TR.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
SC431LCSK-2TR from Semtech is a three-terminal adjustable shunt regulator with ±0.25% reference voltage tolerance, 1.24 V to 20 V programmable output, and 0.05 Ω typical dynamic output impedance. It operates over –40°C to +125°C (industrial grade), supports cathode current from 100 µA to 100 mA, and replaces Zener diodes in precision voltage reference and feedback applications.
For engineers reviewing the SC431LCSK-2TR datasheet, pinout, applications, or equivalent options, key selection criteria include reference voltage accuracy, thermal stability across industrial temperature range, low dynamic impedance for tight regulation, and SOT-23-3 package compatibility with space-constrained power management layouts.
Technical Context
The SC431LCSK-2TR implements a trimmed bandgap reference core with active output circuitry enabling sharp turn-on characteristics and stable regulation down to 1.24 V. Its internal architecture delivers low temperature drift (±20 ppm/°C typical) and maintains reference voltage stability under varying cathode current loads from 100 µA to 100 mA.
Designed for shunt regulation, it requires two external resistors to set output voltage per VOUT = VREF(1 + R1/R2). Stability analysis confirms operation without oscillation when load capacitance is either ≤1 nF or ≥10 µF - avoiding the 10 nF–1 µF instability zone at light cathode currents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.240 V ±0.25% (typical 1.242 V at 25°C, 10 mA cathode current) |
| Output Voltage Range | 1.24 V to 20 V (set externally via two resistors; no internal fixed taps) |
| Dynamic Output Impedance | 0.05 Ω typical (ensures <1 mV output variation per 1 mA load step) |
| Cathode Current Range | 100 µA to 100 mA (supports ultra-low-power biasing and high-current shunt sinking) |
| Operating Temperature | –40°C to +125°C (industrial-grade thermal stability verified over full range) |
| Package | SOT-23-3 (3-pin surface-mount; 2.90 mm × 1.30 mm × 1.02 mm body) |
| Reference Tempco | ±20 ppm/°C typical (low drift enables stable feedback in battery-powered instrumentation) |
Pinout & Package
SOT-23-3 package: 3-pin, single-ended shunt configuration with anode, cathode, and reference terminals. Compact footprint (2.90 × 1.30 mm) optimized for high-density PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Ground reference node | Connected to system ground; establishes return path for cathode current and reference bias |
| Cathode (Pin 2) | Regulated output node | Sinks adjustable current to maintain programmed VOUT; connects to supply rail or error amplifier input |
| Reference (Pin 3) | Precision voltage sense input | Connects to resistor divider midpoint; senses feedback voltage for closed-loop regulation |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed bandgap reference | ±0.25% initial accuracy eliminates need for post-production calibration in mid-precision applications |
| Low dynamic impedance | 0.05 Ω typical ensures minimal output perturbation during fast load transients in switching regulator feedback loops |
| Wide cathode current range | 100 µA–100 mA operation supports both micropower bias networks and high-current shunt compensation |
| Industrial temperature range | –40°C to +125°C guaranteed performance enables use in automotive engine control modules and industrial PLCs |
| RoHS/WEEE compliant | Lead-free SOT-23-3 packaging meets global environmental compliance without derating or reliability trade-offs |
Applications
| Switching Power Supply Feedback | Battery-Operated Instrumentation |
|---|---|
Use Scenario: Provides precise voltage reference for optocoupler-coupled feedback in isolated DC-DC converters. IC Role / Device Role / Timing Role: Shunt regulator acting as adjustable voltage reference and error amplifier input node. Use Value: ±0.25% VREF tolerance and 0.05 Ω dynamic impedance maintain ±1% output regulation across line/load/temperature in 5–24 V outputs. |
Use Scenario: Generates stable 1.24 V reference for ADC biasing and sensor excitation in handheld multimeters. IC Role / Device Role / Timing Role: Low-current shunt reference supplying 100 µA–1 mA to analog front-end circuits. Use Value: 100 µA minimum operating current and ±20 ppm/°C tempco enable accurate measurements over –10°C to +50°C ambient. |
| Computer Disk Drive Power Control | Adjustable Linear Regulator Reference |
Use Scenario: Sets regulated 5 V or 12 V rail for spindle motor drivers and head actuator ICs in HDDs. IC Role / Device Role / Timing Role: Cathode-connected shunt element controlling pass transistor base/gate bias in linear post-regulators. Use Value: Sharp turn-on characteristic and 100 mA sink capability support fast transient response during seek operations. |
Use Scenario: Configures output voltage of discrete NPN/PNP or MOSFET-based linear regulators via resistor divider. IC Role / Device Role / Timing Role: Precision reference source replacing Zener diodes in programmable LDO feedback networks. Use Value: Programmability from 1.24 V enables direct replacement of multiple Zener values with one BOM item. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | ±0.5% VREF tolerance, 1.24 V to 6 V range, SOT-23-5 package (5-pin) | Limited max output voltage (6 V vs. 20 V); requires extra pin for enable function not used in basic shunt mode | Select when lower cost and 6 V max suffices; avoid if >6 V programming or SOT-23-3 footprint required |
| AS431ASTZTR-G1 | ±0.5% VREF, 1.24 V to 20 V range, SOT-23-3, but 10 µA min cathode current (vs. 100 µA) | Higher minimum cathode current reduces usable range in ultra-low-power designs (<100 µA bias) | Prefer for cost-sensitive industrial supplies where 10 µA min is acceptable; not suitable for sub-100 µA instrumentation |
Compared with TLV431ACDBVR and AS431ASTZTR-G1, the SC431LCSK-2TR offers tighter reference accuracy (±0.25%), higher maximum output voltage (20 V), and guaranteed 100 µA minimum cathode current - making it optimal for precision, wide-range, and low-power shunt regulation where SOT-23-3 footprint is mandatory.
Availability
SC431LCSK-2TR is available at Aetrix Electronics and suitable for switching power supply feedback, battery-operated instrumentation, and computer disk drive power control requiring stable component supply across industrial temperature grades and long-term production continuity.
Supply support for SC431LCSK-2TR 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 power management, protection, and sensing.
The SC431L series belongs to Semtech's precision shunt regulator product line, designed specifically for replacing Zener diodes in feedback, reference, and voltage-setting applications demanding accuracy, thermal stability, and compact packaging.
FAQ
What is the reference voltage tolerance of SC431LCSK-2TR?
The SC431LCSK-2TR has a reference voltage tolerance of ±0.25% at 25°C, specified over the full industrial temperature range (–40°C to +125°C). This value is confirmed in the Electrical Characteristics table under "VREF" for the "L" grade variant, and applies to the SOT-23-3 packaged SC431LCSK-2TR with marking "31L".
Can SC431LCSK-2TR be used above 125°C junction temperature?
No. The SC431LCSK-2TR is rated for a maximum junction temperature of +150°C, but its guaranteed electrical performance (including reference voltage accuracy and dynamic impedance) is specified only up to +125°C ambient. Operation beyond +125°C ambient requires thermal derating and validation per Absolute Maximum Ratings, and is not supported by published specifications for SC431LCSK-2TR.
What is the minimum cathode current required for SC431LCSK-2TR regulation?
The SC431LCSK-2TR requires a minimum cathode current of 100 µA to maintain regulation, as specified in the Recommended Operating Conditions table. Below this threshold, reference voltage accuracy degrades and regulation may become unstable - a critical constraint when designing low-power bias networks using SC431LCSK-2TR.
Does SC431LCSK-2TR support 20 V output programming?
Yes. The SC431LCSK-2TR supports output voltages up to 20 V using external resistors per VOUT = VREF(1 + R1/R2). This maximum is validated in the Absolute Maximum Ratings (20 V cathode voltage) and Electrical Characteristics tables, and applies directly to the SC431LCSK-2TR in SOT-23-3 package.
Is SC431LCSK-2TR RoHS compliant?
Yes. The "T" suffix in SC431LCSK-2TR indicates lead-free packaging, and the device is fully compliant with RoHS Directive 2011/65/EU and WEEE requirements, as documented in the Ordering Information section of the official Semtech datasheet.
SC431LCSK-2TR 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):
- 1.24V
- Voltage - Output (Max):
- 16 V
- Current - Output:
- 100 µA
- Tolerance:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SC431LCSK-2TR FAQ
1.How can I place an order for SC431LCSK-2TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-2TR 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 SC431LCSK-2TR reliable?
The price and inventory of SC431LCSK-2TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-2TR is usually 5 days.
3.What payment methods are accepted for SC431LCSK-2TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-2TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LCSK-2TR?
SC431LCSK-2TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-2TR 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 SC431LCSK-2TR?
For technical support, including SC431LCSK-2TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-2TR requirements.
6.How does Aetrix verify that SC431LCSK-2TR is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-2TR 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 SC431LCSK-2TR meets industry standards.
7.What is the process for return or replacement of SC431LCSK-2TR?
All SC431LCSK-2TR units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-2TR, 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 SC431LCSK-2TR part is unused and in its original packaging.
Return procedure for SC431LCSK-2TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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