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Texas Instruments TL431AQDCKR
- Part No.:
- TL431AQDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TL431AQDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,142
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Product details
Overview
TL431AQDCKR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.470–2.520 V reference voltage at 25°C with ±1% initial accuracy (A grade), −40°C to +125°C operating range (Q grade), and 0.2 Ω typical dynamic impedance. It serves as an adjustable feedback element in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431AQDCKR datasheet, TL431AQDCKR pinout, TL431AQDCKR application, or TL431AQDCKR equivalent, key selection criteria include automotive-grade temperature stability, low output noise, sink-current capability up to 100 mA, and compatibility with standard resistor-divider feedback networks for output voltage programming from 2.5 V to 36 V.
Technical Context
The TL431AQDCKR implements a high-gain transconductance amplifier with internal 2.495 V bandgap reference, comparing REF pin voltage to threshold and modulating cathode current to maintain regulation. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop control in flyback and forward converter feedback paths.
Designed for Q-temp (−40°C to +125°C) operation, it exhibits ≤34 mV reference voltage deviation over full temperature range and maintains regulation with minimum cathode current of 0.4–0.7 mA - critical for low-power standby modes in AC/DC adapters and servo drive controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.470–2.520 V at 25°C; sets precise feedback threshold for output voltage regulation |
| Initial Accuracy | ±1% (A grade); ensures tight output tolerance without post-manufacturing trimming |
| Temp Range | −40°C to +125°C (Q grade); supports under-hood automotive and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage perturbation during load transients |
| Sink Current Range | 1–100 mA; enables direct interface with optocoupler LEDs in isolated feedback loops |
| Ref Input Current | 2–4 µA; allows high-value resistor dividers (>1 MΩ) to reduce power loss in battery-backed systems |
| Ref Voltage Drift | ≤34 mV over full temp range; guarantees <0.14% total variation for stable long-term performance |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output | Connects to primary-side optocoupler LED or regulator error amplifier; sinks up to 100 mA |
| Pin 2 (REF) | Reference input | High-impedance sense node; compares external divider voltage to internal 2.495 V threshold |
| Pin 3 (ANODE) | Common return | Typically tied to system ground or secondary-side common; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low output noise | Sub-20 µVRMS (0.1–10 Hz); preserves signal integrity in precision analog feedback paths |
| Sharp turn-on characteristic | Fast response to REF voltage deviations (<1 µs rise time); prevents oscillation in high-bandwidth SMPS |
| Thermal stability | Rated for −40°C to +125°C operation with ≤34 mV VREF drift - meets AEC-Q100 Grade 1 requirements |
| Low quiescent current | Ref input current only 2–4 µA; enables energy-efficient designs in always-on auxiliary supplies |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in 1 kW telecom rectifier with digital PMBus control. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to optocoupler-driven PWM controller. Use Value: ±1% initial accuracy and 0.2 Ω impedance ensure ±0.5% output regulation across line/load/temperature - meeting IEC 62368-1 hold-up and ripple specs. | Use Scenario: Secondary-side voltage sensing in 48 V/20 A factory automation power module. IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback point for isolated DC/DC converter. Use Value: −40°C to +125°C rating and ≤34 mV VREF drift guarantee stable output during thermal cycling in enclosed enclosures. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection circuit in 3-phase VFD. IC Role / Device Role / Timing Role: Precision reference for comparator-based fault detection and analog-to-digital scaling. Use Value: Low 2–4 µA reference input current enables high-resistance divider networks, reducing power dissipation in high-voltage (600 V+) sensing circuits. | Use Scenario: Feedback reference in multi-axis motion controller's isolated auxiliary supply. IC Role / Device Role / Timing Role: Programmable shunt regulator stabilizing 5 V/3.3 V logic rails from main DC bus. Use Value: 100 mA sink capability supports direct driving of optocoupler LEDs without external transistor - simplifying BOM and layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Same A-grade accuracy but C-temp (0°C to 70°C); SOT-23-3 package; lower cost | Not qualified for automotive or extended industrial ambient; unsuitable above 70°C | Select when operating environment stays within commercial temperature range and cost sensitivity outweighs thermal margin |
| TL431BQDBVR | B-grade (±0.5%) accuracy; same Q-temp rating; identical SOT-23-3 footprint | Higher precision required for medical or test equipment where tighter output tolerance is mandatory | Choose when ±0.5% initial accuracy is needed without changing PCB layout or thermal design |
Compared with TL431ACDBVR, TL431AQDCKR adds 55°C higher upper temperature limit and retains A-grade accuracy; versus TL431BQDBVR, it trades 0.5% accuracy for lower unit cost while maintaining full automotive-grade thermal robustness - making TL431AQDCKR optimal for cost-constrained, high-reliability industrial power systems.
Availability
TL431AQDCKR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431AQDCKR 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in power management and precision analog ICs.
The TL431 product line delivers programmable shunt references for feedback loop stabilization in isolated power supplies, designed specifically for automotive, industrial, and telecom applications demanding high accuracy and wide temperature operation.
FAQ
What is the reference voltage tolerance of TL431AQDCKR at 25°C?
The TL431AQDCKR has a reference voltage tolerance of ±1% at 25°C (A grade), corresponding to a 2.470–2.520 V range. This specification is verified per TI's SLVS543S datasheet Section 6.10 and ensures predictable feedback threshold behavior in power supply designs without calibration.
Does TL431AQDCKR support operation beyond 125°C junction temperature?
No. TL431AQDCKR is rated for maximum junction temperature of 150°C per Absolute Maximum Ratings (Section 6.1), but its specified operating free-air temperature range is −40°C to +125°C (Q grade). Operation above +125°C ambient requires derating based on thermal resistance (RθJA = 206°C/W for DCK package) and must stay below 150°C TJ.
Can TL431AQDCKR replace a Zener diode in linear regulator applications?
Yes. TL431AQDCKR functions as a 2.5 V programmable Zener with superior characteristics: sharper knee, lower dynamic impedance (0.2 Ω vs typical 10–100 Ω for Zeners), and tighter tolerance. Its three-terminal architecture enables precise voltage setting via external resistors - unlike two-terminal Zeners - making it ideal for adjustable shunt regulators and error amplifiers.
What is the minimum cathode current required for regulation in TL431AQDCKR?
The TL431AQDCKR requires a minimum cathode current of 0.4–0.7 mA to maintain regulation, as specified in Section 6.10 of the datasheet. This low Imin enables reliable startup and light-load operation in energy-efficient power supplies, especially when paired with high-value feedback resistors.
Is TL431AQDCKR pin-compatible with other TL431 variants in SOT-23-3?
Yes. TL431AQDCKR uses the standard TL431 SOT-23-3 pinout (CATHODE–REF–ANODE), matching all TL431x DCK/DCKR variants regardless of grade (A/B/standard) or temperature rating (C/I/Q). No PCB redesign is needed when upgrading from TL431ACDCKR or TL431BQDCKR.
TL431AQDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TL431AQDCKR FAQ
1.How can I place an order for TL431AQDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDCKR 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 TL431AQDCKR reliable?
The price and inventory of TL431AQDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDCKR is usually 5 days.
3.What payment methods are accepted for TL431AQDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDCKR?
TL431AQDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDCKR 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 TL431AQDCKR?
For technical support, including TL431AQDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDCKR requirements.
6.How does Aetrix verify that TL431AQDCKR is sourced from the original manufacturer or authorized distributors?
All TL431AQDCKR 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 TL431AQDCKR meets industry standards.
7.What is the process for return or replacement of TL431AQDCKR?
All TL431AQDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDCKR, 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 TL431AQDCKR part is unused and in its original packaging.
Return procedure for TL431AQDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDCKR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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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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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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