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Semtech Corporation SC431LCSK-.5TRT.P2
- Part No.:
- SC431LCSK-.5TRT.P2
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-.5TRT.P2.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,756
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Product details
Overview
SC431LCSK-.5TRT.P2 from Semtech is a three-terminal adjustable shunt regulator with 0.5% initial reference voltage tolerance, 1.24 V to 20 V programmable output range via two external resistors, and 0.05 Ω typical dynamic output impedance. It replaces Zener diodes in precision voltage reference and error amplifier applications within switching power supplies and battery-operated instrumentation.
For engineers reviewing the SC431LCSK-.5TRT.P2 datasheet, pinout, applications, or equivalent options, key selection criteria include cathode current range (100 µA to 100 mA), thermal stability over −40°C to +125°C, SOT-23-3 package compatibility, and low dynamic impedance for stable feedback loop performance.
Technical Context
The SC431LCSK-.5TRT.P2 implements a trimmed bandgap reference core with active output circuitry enabling sharp turn-on characteristics and precise regulation down to 1.24 V. Its design supports both fixed and adjustable configurations using external resistor dividers while maintaining ±0.5% reference accuracy across temperature.
It operates as a two-quadrant device: sourcing cathode current when VZ > VREF and sinking minimal off-state current (<0.5 µA at VZ = 6 V) when VZ < VREF. Stability analysis confirms safe operation only with CL ≤ 1 nF or ≥ 10 µF due to inherent phase margin limitations in the 10 nF–1 µF range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal, ±0.5% tolerance at 10 mA cathode current - enables accurate voltage setting across full 1.24–20 V range |
| Cathode Current Range | 100 µA to 100 mA operating range - supports low-power standby and high-current regulation without external amplification |
| Dynamic Output Impedance | 0.05 Ω typical at f < 1 kHz - ensures minimal output voltage deviation under transient load changes |
| Temperature Range | −40°C to +125°C ambient - validated for industrial-grade reliability in embedded power management |
| Package | SOT-23-3 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts |
| Off-State Cathode Current | ≤0.5 µA at VZ = 6 V, TA = 25°C - minimizes quiescent power loss in shutdown or light-load conditions |
| Reference Tempco | ±20 ppm/°C max - maintains tight output stability across wide thermal environments |
Pinout & Package
SOT-23-3 package: 3-pin, lead-free, RoHS-compliant plastic surface-mount package with 0.95 mm pitch and 2.80 mm × 1.30 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Output terminal / regulated voltage node | Connects to supply rail being regulated; sinks current to maintain VZ = VREF(1 + R1/R2) |
| Anode (A) | Ground reference / return path | Provides low-impedance return for cathode current; must be connected directly to system ground plane |
| Reference (R) | Feedback input / precision voltage sense | Accepts resistor divider from cathode; sets output voltage per VOUT = VREF(1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 1.24 V to 20 V using two external resistors - eliminates need for multiple fixed-voltage references |
| Low dynamic impedance | 0.05 Ω typical - improves transient response and reduces output ripple in feedback loops |
| Sharp turn-on characteristic | Active output stage enables fast regulation onset - critical for error amplifier use in SMPS control circuits |
| Thermal stability | Guaranteed performance over −40°C to +125°C - suitable for automotive and industrial environments |
| Zener diode upgrade path | Pin-compatible replacement for TLV431A with tighter tolerance and lower impedance - simplifies legacy design refresh |
Applications
| Switching Power Supply Feedback | Battery Voltage Monitor |
|---|---|
Use Scenario: Used in secondary-side feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to optocoupler input. Use Value: ±0.5% reference accuracy and 0.05 Ω impedance ensure stable regulation under line/load transients without compensation redesign. | Use Scenario: Monitors lithium-ion cell voltage in portable computing systems during charge/discharge cycles. IC Role / Device Role / Timing Role: Adjustable threshold detector comparing battery voltage against programmable reference. Use Value: 100 µA minimum operating current enables ultra-low-power monitoring during sleep mode. |
| Instrumentation Reference | Disk Drive Power Sequencing |
Use Scenario: Provides stable 2.5 V reference for 12-bit ADC in portable test equipment. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source for analog front-end calibration. Use Value: ±20 ppm/°C tempco and 1.24 V base reference allow accurate scaling across operating temperature range. | Use Scenario: Controls power-up sequencing of spindle motor and servo electronics in HDD controllers. IC Role / Device Role / Timing Role: Shunt regulator generating enable threshold for downstream LDOs via resistor divider. Use Value: Sharp turn-on and 100 mA cathode current capability support reliable timing margin in multi-rail sequencing. |
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% reference tolerance, but higher 0.2 Ω dynamic impedance and narrower 1.24–6 V output range | Limited to low-voltage applications; less suitable for 12 V or 15 V regulation | Choose when cost sensitivity outweighs impedance and voltage range requirements |
| AS431ARTDT | 0.5% tolerance, SOT-23-3, but rated only to +85°C ambient and lacks guaranteed −40°C performance | Not qualified for extended industrial temperature operation | Select only for commercial-grade designs where thermal derating is acceptable |
Compared with TLV431ACDBVR and AS431ARTDT, the SC431LCSK-.5TRT.P2 delivers superior dynamic impedance (0.05 Ω vs. 0.2 Ω), wider output voltage range (up to 20 V), and guaranteed operation down to −40°C - making it optimal for high-reliability industrial and automotive power management.
Availability
SC431LCSK-.5TRT.P2 is available at Aetrix Electronics and suitable for switching power supplies, battery-operated computers, and instrumentation requiring stable component supply with full industrial temperature support and RoHS compliance.
Supply support for SC431LCSK-.5TRT.P2 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 semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, protection, and sensing applications.
The SC431L product line delivers precision shunt regulators optimized for feedback accuracy, thermal stability, and Zener diode replacement in industrial and computing power systems.
FAQ
What is the maximum cathode voltage rating for SC431LCSK-.5TRT.P2?
The SC431LCSK-.5TRT.P2 has an absolute maximum cathode voltage of 20 V. Exceeding this value risks permanent damage. Operation above 16 V requires verification of power dissipation limits based on ambient temperature and package thermal resistance (θJA = 365°C/W for SOT-23-3).
Can SC431LCSK-.5TRT.P2 replace a standard Zener diode directly?
Yes, the SC431LCSK-.5TRT.P2 can directly replace Zener diodes in most shunt regulation applications. Its active circuitry provides sharper turn-on, lower dynamic impedance (0.05 Ω vs. typical Zener's 10–100 Ω), and tighter voltage tolerance (±0.5% vs. ±5% for common Zeners), improving regulation accuracy and transient response.
What is the minimum cathode current required for SC431LCSK-.5TRT.P2 to maintain regulation?
The SC431LCSK-.5TRT.P2 requires a minimum cathode current of 100 µA to maintain regulation. Below this level, the device enters off-state with cathode current dropping to ≤0.5 µA, causing loss of output voltage control. Designers must ensure resistor divider values guarantee IZ ≥ 100 µA at minimum input voltage.
Does SC431LCSK-.5TRT.P2 support operation at −40°C?
Yes, the SC431LCSK-.5TRT.P2 is fully specified and tested for operation from −40°C to +125°C ambient temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, supporting use in harsh-environment applications including automotive subsystems and outdoor industrial controls.
How does load capacitance affect SC431LCSK-.5TRT.P2 stability?
SC431LCSK-.5TRT.P2 exhibits instability with load capacitances between 10 nF and 1 µF at cathode currents ≤3 mA. Stable operation requires either CL ≤1 nF (no local decoupling) or CL ≥10 µF (bulk capacitor). Local decoupling should be placed at the load, not directly across the device, to avoid oscillation during startup transients.
SC431LCSK-.5TRT.P2 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:
- ±0.5%
- 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-.5TRT.P2 FAQ
1.How can I place an order for SC431LCSK-.5TRT.P2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-.5TRT.P2 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-.5TRT.P2 reliable?
The price and inventory of SC431LCSK-.5TRT.P2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-.5TRT.P2 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-.5TRT.P2 transactions.
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SC431LCSK-.5TRT.P2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-.5TRT.P2 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-.5TRT.P2?
For technical support, including SC431LCSK-.5TRT.P2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-.5TRT.P2 requirements.
6.How does Aetrix verify that SC431LCSK-.5TRT.P2 is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-.5TRT.P2 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-.5TRT.P2 meets industry standards.
7.What is the process for return or replacement of SC431LCSK-.5TRT.P2?
All SC431LCSK-.5TRT.P2 units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-.5TRT.P2, 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-.5TRT.P2 part is unused and in its original packaging.
Return procedure for SC431LCSK-.5TRT.P2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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