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Semtech Corporation SC431LC5SK.25TR
- Part No.:
- SC431LC5SK.25TR
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LC5SK.25TR.pdf
- Description:
- IC VREF SHUNT ADJ 0.25% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,108
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Product details
Overview
SC431LC5SK.25TR from Semtech is a three-terminal adjustable shunt regulator with 0.25% initial reference voltage tolerance, 1.24 V to 20 V programmable output, 0.05 Ω typical dynamic output impedance, and thermal stability over –40°C to +150°C. It replaces Zener diodes in precision voltage reference and feedback regulation circuits for switching power supplies and battery-powered instrumentation.
For engineers reviewing the SC431LC5SK.25TR datasheet, pinout, applications, or equivalent options, key selection criteria include reference voltage accuracy, cathode current range (100 µA to 100 mA), low dynamic impedance, SOT-23-5 package compatibility, and stability behavior under varying load capacitance.
Technical Context
The SC431LC5SK.25TR implements a trimmed bandgap reference core with active output circuitry enabling sharp turn-on characteristics. Its reference voltage (VREF) is internally fixed at 1.24 V and externally adjustable via two resistors per the equation VOUT = VREF(1 + R1/R2). It operates across a wide cathode current range without requiring minimum load current.
Thermal stability is guaranteed over –40°C to +150°C ambient, with reference voltage drift of ±0.1 mV/°C max and <±2.7 mV total variation over temperature. The device exhibits instability with 10 nF–1 µF load capacitance at light cathode currents (<3 mA), necessitating either no direct bypass capacitor or ≥10 µF for stable operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.25% at 25°C - enables high-accuracy feedback loops without external trimming |
| Adjustable Output Range | 1.24 V to 20 V - supports wide-range programmable regulation using two external resistors |
| Dynamic Output Impedance | 0.05 Ω typical - minimizes output voltage deviation under fast load transients |
| Cathode Current Range | 100 µA to 100 mA - accommodates low-power standby and high-current regulation modes |
| Operating Temperature | –40°C to +150°C - suitable for industrial and automotive under-hood applications |
| Reference Voltage Drift | ±0.1 mV/°C max - ensures predictable output shift across thermal cycling |
| Off-State Cathode Current | ≤0.51 µA at VZ = 6 V - reduces quiescent power loss in shutdown or light-load states |
Pinout & Package
SOT-23-5 package with gull-wing leads, 1.90 mm × 1.30 mm body, 0.95 mm pitch, and exposed thermal pad (pin 5) for enhanced thermal dissipation. RoHS-compliant, lead-free, tape-and-reel packaging (3000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference Input | Connects to resistor divider midpoint; senses regulated output voltage for feedback |
| Pin 2 (Cathode) | Output Terminal | Sinks current to maintain set voltage; connects to supply rail or error amplifier input |
| Pin 3 (Ref) | Reference Node | Internal 1.24 V bandgap reference; tied to resistor divider lower leg |
| Pin 4 (NC) | No Connect | Internally unconnected; must be left floating or grounded per layout guidelines |
| Pin 5 (EPAD) | Thermal Pad | Electrically isolated thermal path to PCB ground plane; improves power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed Bandgap Reference | ±0.25% initial accuracy eliminates need for post-production calibration |
| Sharp Turn-On Characteristic | Active output stage enables fast response to voltage deviations vs. passive Zener behavior |
| Wide Operating Current Range | 100 µA to 100 mA supports both ultra-low-power sensing and high-current regulation |
| Thermal Stability Guarantee | Specified performance over –40°C to +150°C ambient avoids derating in harsh environments |
| Lead-Free & RoHS Compliance | Meets WEEE/RoHS directives; compatible with standard Pb-free reflow profiles |
Applications
| Switching Power Supply Feedback | Battery-Operated Instrumentation |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converters by feeding error signal to optocoupler input. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5 V feedback threshold for PWM controller. Use Value: ±0.25% VREF tolerance maintains ±1% output regulation across line/load/temperature without trimming. | Use Scenario: Supplies accurate reference for ADCs and sensor signal conditioning in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Low-drift voltage reference source powering analog front-end circuitry. Use Value: 0.05 Ω dynamic impedance prevents reference droop during ADC sampling bursts. |
| Computer Disk Drive Power | Industrial Motor Control |
Use Scenario: Stabilizes +5 V and +12 V rails in HDD spindle and actuator driver circuits. IC Role / Device Role / Timing Role: Shunt regulator maintaining tight voltage margins during rapid current transients. Use Value: 100 µA to 100 mA operating range supports both idle and full-speed drive operation. | Use Scenario: Provides isolated feedback reference for gate driver bias supplies in IGBT inverters. IC Role / Device Role / Timing Role: High-temperature-stable reference ensuring consistent gate voltage under thermal stress. Use Value: Guaranteed operation to +150°C ambient enables placement near power modules without derating. |
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 | Limited max output voltage restricts use in >6 V feedback loops | Select when cost sensitivity outweighs need for >6 V adjustability or 0.25% accuracy |
| AS431ATBZ | 0.5% VREF tolerance, 1.24 V to 20 V range, SOT-23-3 package (3-pin) | No thermal pad or NC pin; lower thermal performance and no pin 4 isolation | Choose for space-constrained layouts where thermal dissipation is secondary to footprint size |
Compared with TLV431ACDBVR and AS431ATBZ, the SC431LC5SK.25TR delivers superior initial accuracy and extended voltage range while leveraging its SOT-23-5 thermal pad for higher power handling-critical for industrial feedback designs demanding long-term stability.
Availability
SC431LC5SK.25TR is available at Aetrix Electronics and suitable for switching power supply feedback, battery-operated instrumentation, and industrial motor control requiring stable component supply with guaranteed long-term availability.
Supply support for SC431LC5SK.25TR 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 product line delivers precision adjustable shunt regulators optimized for feedback accuracy, thermal robustness, and Zener replacement in power conversion and instrumentation systems.
FAQ
What is the reference voltage tolerance of SC431LC5SK.25TR?
The SC431LC5SK.25TR has a ±0.25% initial reference voltage tolerance at 25°C, verified across the full production lot. This tight tolerance directly translates to improved system-level output regulation accuracy in feedback applications, reducing or eliminating the need for post-assembly calibration. The SC431LC5SK.25TR maintains this specification without requiring external trimming components.
Can SC431LC5SK.25TR replace a Zener diode in existing designs?
Yes, the SC431LC5SK.25TR is explicitly designed as a high-performance Zener diode upgrade, offering sharper turn-on, lower dynamic impedance (0.05 Ω vs. typical Zener's >10 Ω), and tighter voltage tolerance. Unlike Zeners, the SC431LC5SK.25TR provides stable regulation down to 100 µA cathode current and supports programmable outputs up to 20 V using two external resistors.
What is the maximum cathode current rating for SC431LC5SK.25TR?
The absolute maximum cathode current for SC431LC5SK.25TR is 100 mA, with an instantaneous turn-on limit of 150 mA. Operation within the 100 µA to 100 mA range ensures specified electrical performance, including reference voltage accuracy and dynamic impedance. Exceeding 100 mA continuously risks thermal overload unless PCB copper area and airflow meet SOT-23-5 thermal design guidelines.
How does SC431LC5SK.25TR handle load capacitance stability?
The SC431LC5SK.25TR exhibits instability with 10 nF–1 µF capacitors directly across its cathode-anode terminals at light loads (<3 mA). Stable operation requires either no direct bypass capacitor (relying on remote load decoupling) or ≥10 µF local capacitance. This behavior is documented in the datasheet's Applications Information section and applies specifically to the SC431LC5SK.25TR's internal compensation.
Is SC431LC5SK.25TR RoHS compliant and lead-free?
Yes, SC431LC5SK.25TR is fully RoHS compliant and lead-free, meeting both WEEE and RoHS directives. The "T" suffix in the part number confirms lead-free construction, and the device is qualified for standard Pb-free reflow soldering profiles. Its SOT-23-5 package uses matte tin plating compatible with industry-standard assembly processes.
SC431LC5SK.25TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±0.25%
- 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-23-5
SC431LC5SK.25TR FAQ
1.How can I place an order for SC431LC5SK.25TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LC5SK.25TR 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 SC431LC5SK.25TR reliable?
The price and inventory of SC431LC5SK.25TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LC5SK.25TR is usually 5 days.
3.What payment methods are accepted for SC431LC5SK.25TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LC5SK.25TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LC5SK.25TR?
SC431LC5SK.25TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LC5SK.25TR 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 SC431LC5SK.25TR?
For technical support, including SC431LC5SK.25TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LC5SK.25TR requirements.
6.How does Aetrix verify that SC431LC5SK.25TR is sourced from the original manufacturer or authorized distributors?
All SC431LC5SK.25TR 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 SC431LC5SK.25TR meets industry standards.
7.What is the process for return or replacement of SC431LC5SK.25TR?
All SC431LC5SK.25TR units undergo pre-shipment inspection (PSI). If there is an issue with SC431LC5SK.25TR, 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 SC431LC5SK.25TR part is unused and in its original packaging.
Return procedure for SC431LC5SK.25TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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