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Texas Instruments TL431AIDBVR
- Part No.:
- TL431AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AIDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,657
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Product details
Overview
TL431AIDBVR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±1% initial tolerance at 25°C, 0.2 Ω typical dynamic impedance, and sink-current capability from 1 mA to 100 mA. It operates across −40°C to 85°C and serves as a stable feedback element in isolated DC-DC converters and adjustable linear regulators.
For engineers reviewing the TL431AIDBVR datasheet, TL431AIDBVR pinout, TL431AIDBVR application, or TL431AIDBVR equivalent, key selection criteria include its A-grade accuracy, thermal drift performance (14 mV over full temperature range), low-noise operation, and compatibility with standard resistor-divider feedback networks in power supply control loops.
Technical Context
The TL431AIDBVR implements an internal high-gain transconductance amplifier driving an NPN output stage, enabling sharp turn-on and precise regulation via external resistive feedback between cathode (K), anode (A), and reference (REF) terminals. Its architecture replaces discrete Zener diodes in closed-loop voltage sensing applications.
It functions as a 2.5 V bandgap-referenced error amplifier with adjustable output from Vref to 36 V, featuring low output noise (<10 µVRMS over 0.1–10 Hz), stable small-signal gain (>40 dB up to 10 kHz), and guaranteed stability with load capacitances up to 10 nF under defined current conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for power supply regulation |
| Temperature Range | −40°C to +85°C - supports industrial-grade operation without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under varying load/sink currents |
| Sink Current Range | 1 mA to 100 mA - enables direct interface with optocoupler LEDs and error amplifier outputs |
| Voltage Adjustment Range | 2.5 V to 36 V - allows flexible output programming using two external resistors |
| Reference Input Current | 2–4 µA - imposes negligible loading on feedback divider, preserving accuracy |
| Output Noise | <10 µVRMS (0.1–10 Hz) - minimizes jitter in sensitive feedback paths |
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 feedback node or optocoupler anode; sinks regulated current |
| Pin 2 (ANODE) | Common reference return | Typically tied to system ground or power supply return; defines voltage reference point |
| Pin 3 (REF) | Threshold input | Monitors divided output voltage; triggers regulation when ≈2.495 V is reached |
Key Features
| Feature | Design Value |
|---|---|
| Initial accuracy grade | A-grade (±1% at 25°C) - tighter tolerance than standard grade, suitable for mid-precision power supplies |
| Thermal stability | 14 mV max deviation over −40°C to +85°C - ensures consistent regulation across operating environments |
| Low dynamic impedance | 0.2 Ω typical - maintains stable reference voltage despite rapid current transients |
| Wide sink-current range | 1–100 mA - directly drives common optocouplers (e.g., PC817, SFH615A) without buffer stages |
| Adjustable output | 2.5 V to 36 V via two-resistor divider - eliminates need for multiple fixed-reference parts in BOM |
Applications
| AC/DC Power Adapter | Rack Server PSU |
|---|---|
Use Scenario: Secondary-side voltage feedback in flyback converters for notebook adapters. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for optocoupler-coupled primary controller. Use Value: Enables ±1% output regulation across line/load/temperature with minimal external components. |
Use Scenario: Isolated feedback path in multi-output 12 V/5 V/3.3 V server power supplies. IC Role / Device Role / Timing Role: High-stability reference for secondary-side error amplifiers coordinating cross-regulation. Use Value: Maintains tight output tolerance under dynamic load steps and ambient temperature shifts up to 85°C. |
| Industrial Motor Drive | Servo Control Module |
Use Scenario: Feedback reference in auxiliary bias supply for gate drivers in AC inverter systems. IC Role / Device Role / Timing Role: Stable voltage reference for isolated DC-DC converter powering IGBT/SiC driver ICs. Use Value: Ensures consistent gate drive voltage despite wide input fluctuations and ambient heat in motor enclosures. |
Use Scenario: Regulation of analog sensor supply and position feedback circuitry in servo amplifiers. IC Role / Device Role / Timing Role: Low-noise reference source for ADC reference and op-amp biasing in closed-loop motion control. Use Value: Reduces position error by minimizing reference-induced offset drift in precision analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | ±0.5% initial tolerance (B-grade), same SOT-23-3 package and temperature range (0°C to 70°C) | Higher accuracy but narrower operating temperature range - suited for commercial-grade consumer power supplies | Select TL431ACDBVR only if tighter initial tolerance is required and ambient temperature stays within 0–70°C. |
| TL431AIDBVT | Same A-grade accuracy and −40°C to +85°C rating, but in SOT-23-5 package with exposed thermal pad | Enhanced thermal performance (RθJA = 206°C/W vs. 206°C/W for DBVR - identical per TI data; DBVT offers better RθJC) - preferred for higher-power dissipation scenarios | Choose TL431AIDBVT when >50 mA continuous sink current or sustained power dissipation >300 mW is expected. |
Compared with TL431AIDBVR, TL431ACDBVR trades wider temperature coverage for improved initial accuracy, while TL431AIDBVT retains identical electrical specs but improves thermal management - making TL431AIDBVR the optimal balance of accuracy, ruggedness, and compact footprint for general-purpose industrial feedback.
Availability
TL431AIDBVR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TL431AIDBVR 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 technologies, with decades of expertise in precision reference design.
The TL431 product line delivers cost-effective, high-stability shunt references for feedback control in isolated power supplies, targeting industrial, computing, and motor control applications where reliability and thermal robustness are critical.
FAQ
What is the reference voltage tolerance of TL431AIDBVR at 25°C?
The TL431AIDBVR has an initial reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output ranging from 2.470 V to 2.520 V under standard test conditions (VKA = Vref, IKA = 10 mA). This A-grade accuracy is specified in TI's SLVS543S datasheet Section 6.8.
Can TL431AIDBVR replace a Zener diode in feedback circuits?
Yes, TL431AIDBVR is explicitly designed as a superior replacement for Zener diodes in voltage regulation feedback paths. Its active amplifier architecture provides sharper turn-on, lower dynamic impedance (0.2 Ω vs. typical Zener impedance >10 Ω), and tighter voltage tolerance - all confirmed in TI's device description and Figure 6-16 stability analysis.
What is the maximum cathode voltage rating for TL431AIDBVR?
The absolute maximum cathode-to-anode voltage (VKA) for TL431AIDBVR is 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. Exceeding 37 V risks permanent damage, as stated in Section 6.1 Absolute Maximum Ratings of the TI datasheet.
Does TL431AIDBVR require external compensation for stability?
TL431AIDBVR does not require external compensation in most standard feedback configurations, but stability depends on load capacitance and sink current. Per Figure 6-16 and 6-18, oscillation risk increases above 10 nF capacitance at low currents (<10 mA); TI recommends verifying phase margin with actual layout and load conditions.
What is the minimum cathode current needed for regulation in TL431AIDBVR?
The minimum cathode current (Imin) required for proper regulation in TL431AIDBVR is 0.4 mA, with a typical value of 0.6 mA under VKA = Vref conditions. This ensures the internal amplifier remains biased in active region, as documented in Sections 6.8–6.10 of the TI datasheet.
TL431AIDBVR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431AIDBVR FAQ
1.How can I place an order for TL431AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIDBVR 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 TL431AIDBVR reliable?
The price and inventory of TL431AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIDBVR is usually 5 days.
3.What payment methods are accepted for TL431AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIDBVR?
TL431AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIDBVR 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 TL431AIDBVR?
For technical support, including TL431AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIDBVR requirements.
6.How does Aetrix verify that TL431AIDBVR is sourced from the original manufacturer or authorized distributors?
All TL431AIDBVR 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 TL431AIDBVR meets industry standards.
7.What is the process for return or replacement of TL431AIDBVR?
All TL431AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIDBVR, 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 TL431AIDBVR part is unused and in its original packaging.
Return procedure for TL431AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AIDBVR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
Diodes Incorporated
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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
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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