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Texas Instruments TL431AQDBVR
- Part No.:
- TL431AQDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AQDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:18,637
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Product details
Overview
TL431AQDBVR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C, −40°C to 125°C operating temperature range, and 14 mV max reference voltage deviation over full temperature range. It delivers 0.2 Ω typical dynamic impedance and supports adjustable output from 2.47 V to 36 V using two external resistors - widely used in isolated feedback loops of AC/DC adapters and industrial servo drive control modules.
For engineers reviewing the TL431AQDBVR datasheet, TL431AQDBVR pinout, TL431AQDBVR application, or TL431AQDBVR equivalent, this page provides verified electrical specifications, thermal performance data, automotive-grade temperature stability metrics, and validated alternative parts for power supply feedback design and voltage regulation replacement of Zener diodes.
Technical Context
The TL431AQDBVR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference voltage source, and output transistor. Its REF pin senses voltage relative to ANODE, enabling precise feedback control when configured with external resistor dividers.
It operates as a high-gain, low-output-impedance current sink: cathode current (IKA) ranges from 1 mA to 100 mA, with minimum regulation current of 0.4 mA and off-state leakage below 0.5 µA at 36 V cathode voltage. The device exhibits sharp turn-on characteristics and stable small-signal voltage amplification up to 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2.47–2.52 V at 25°C; sets precise feedback threshold for closed-loop regulation. |
| Initial Tolerance | ±1% at 25°C (A grade); enables accurate output voltage setting without trimming. |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial environments. |
| Ref Voltage Drift | ≤34 mV over full temperature range; ensures <±0.14% output variation across operating conditions. |
| Dynamic Impedance | 0.2 Ω typical; maintains stable regulation under fast load transients and ripple rejection. |
| Cathode Current Range | 1–100 mA; supports direct interface with optocoupler LEDs or discrete transistor drivers. |
| Reference Input Current | 2–4 µA; minimizes divider resistor power loss and improves high-impedance feedback accuracy. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output node | Connects to regulated rail or optocoupler anode; sinks current to maintain Vref at REF pin. |
| REF (Pin 2) | Reference input sensing node | High-impedance input that compares divided output voltage against internal 2.495 V reference. |
| ANODE (Pin 3) | Common return/reference ground | Typically tied to system ground or power supply return; serves as voltage reference point for REF pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.47 V to 36 V via two-resistor divider; replaces multiple fixed Zener diodes in one footprint. |
| Low output noise | ≤260 nV/√Hz at 1 kHz; critical for low-noise feedback in precision power supplies. |
| Sharp turn-on characteristic | Fast response to voltage deviations; enables stable regulation in switching PSUs with high loop bandwidth. |
| Automotive temperature grade | Q-temp (−40°C to +125°C); meets AEC-Q100 stress test requirements for automotive power systems. |
| ESD robustness | ±2000 V HBM; withstands handling and board assembly without protection circuitry. |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in isolated flyback converters delivering 12 V/48 V to server backplanes. IC Role / Device Role / Timing Role: Shunt reference providing precise error signal to optocoupler, closing regulation loop across isolation barrier. Use Value: ±1% Vref tolerance and 0.2 Ω impedance ensure ±1.5% output voltage accuracy under line/load transients. |
Use Scenario: Output voltage regulation in 3 kW industrial rectifier with wide input AC range (85–265 VAC). IC Role / Device Role / Timing Role: Adjustable shunt reference setting 24 V output via resistor network; interfaces with TL431-compatible PWM controller. Use Value: Q-grade temperature stability prevents output drift during extended operation at 70°C ambient. |
| AC Inverter Drive | Servo Drive Control Module |
|
Use Scenario: DC bus voltage monitoring and overvoltage protection trigger in 3-phase motor inverters. IC Role / Device Role / Timing Role: Precision threshold detector comparing scaled DC bus voltage against 2.495 V reference. Use Value: Low Iref (≤4 µA) allows high-value resistor dividers, minimizing power loss and heat generation. |
Use Scenario: Feedback regulation of auxiliary 5 V/3.3 V rails powering FPGA, encoder interface, and gate drivers. IC Role / Device Role / Timing Role: Programmable shunt regulator replacing Zener diodes to improve long-term stability and thermal drift. Use Value: 14 mV max Vref deviation over −40°C to +125°C ensures consistent logic rail accuracy across motor enclosure temperatures. |
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 SOT-23-3 package, C-temp grade (0°C to 70°C), ±1% tolerance, 6 mV max Vref drift. | Limited to commercial-temperature applications; unsuitable for under-hood or high-ambient industrial use. | Select when cost sensitivity outweighs extended temperature requirement and ambient stays ≤70°C. |
| TL431BQDBVR | Same Q-temp rating (−40°C to 125°C), but ±0.5% initial tolerance and tighter 14 mV Vref drift spec. | Higher accuracy enables tighter output regulation in medical or test equipment power supplies. | Choose when ±0.5% output voltage accuracy is required and budget permits premium grade. |
Compared with TL431ACDBVR, TL431AQDBVR adds automotive-grade thermal stability without sacrificing footprint or cost; versus TL431BQDBVR, it trades 0.5% tolerance for lower unit price while retaining identical Q-temp qualification and reliability.
Availability
TL431AQDBVR is available at Aetrix Electronics and suitable for rack server power supplies, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TL431AQDBVR 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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in precision reference and power control technologies.
The TL431 product line was designed for high-accuracy, low-drift voltage regulation in isolated power supplies, feedback loops, and voltage-monitoring circuits - targeting automotive, industrial, and computing applications demanding long-term stability.
FAQ
What is the reference voltage tolerance of TL431AQDBVR at 25°C?
The TL431AQDBVR has a reference voltage tolerance of ±1% at 25°C, corresponding to a Vref range of 2.47 V to 2.52 V. This A-grade specification is confirmed in Section 6.10 of the TI SLVS543S datasheet and applies specifically to the Q-temp variant in SOT-23-3 packaging. The TL431AQDBVR maintains this tolerance across its full operating temperature range.
What is the maximum operating temperature range for TL431AQDBVR?
The TL431AQDBVR is rated for operation from −40°C to +125°C, per its Q-temp qualification. This automotive-grade temperature range is explicitly defined in the Device Comparison Table and Section 6.7–6.10 of the TI datasheet. Thermal derating begins above 125°C junction temperature, with absolute maximum TJ = 150°C.
How does TL431AQDBVR differ from TL431CDBVR in terms of temperature performance?
The TL431AQDBVR operates from −40°C to +125°C (Q grade) with ≤34 mV reference voltage deviation, while TL431CDBVR is limited to 0°C to +70°C (C grade) and exhibits ≤16 mV deviation. Both share ±1% initial tolerance and SOT-23-3 packaging, but TL431AQDBVR is qualified for harsher thermal environments including automotive under-hood and industrial motor drives.
What is the typical dynamic impedance of TL431AQDBVR and why does it matter?
The TL431AQDBVR has a typical dynamic impedance of 0.2 Ω, measured at ≤1 kHz with cathode current from 1 mA to 100 mA. This low value ensures minimal output voltage perturbation during load transients and improves ripple rejection in feedback loops - critical for maintaining tight regulation in switching power supplies where TL431AQDBVR is commonly deployed.
Can TL431AQDBVR replace a Zener diode in a power supply feedback circuit?
Yes, TL431AQDBVR is explicitly designed as a precision replacement for Zener diodes in voltage regulation and feedback applications. Its sharp turn-on characteristic, adjustable output (2.47 V to 36 V), low dynamic impedance (0.2 Ω), and stable reference (±1% at 25°C, ≤34 mV drift) enable superior accuracy, thermal stability, and transient response compared to standard Zeners - especially in isolated flyback and forward converter topologies.
TL431AQDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
TL431AQDBVR FAQ
1.How can I place an order for TL431AQDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDBVR 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 TL431AQDBVR reliable?
The price and inventory of TL431AQDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDBVR is usually 5 days.
3.What payment methods are accepted for TL431AQDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDBVR?
TL431AQDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDBVR 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 TL431AQDBVR?
For technical support, including TL431AQDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDBVR requirements.
6.How does Aetrix verify that TL431AQDBVR is sourced from the original manufacturer or authorized distributors?
All TL431AQDBVR 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 TL431AQDBVR meets industry standards.
7.What is the process for return or replacement of TL431AQDBVR?
All TL431AQDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDBVR, 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 TL431AQDBVR part is unused and in its original packaging.
Return procedure for TL431AQDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDBVR 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
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