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Texas Instruments TL431AIDBVRG4
- Part No.:
- TL431AIDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AIDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,797
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Product details
Overview
TL431AIDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in feedback loops of isolated DC/DC converters and AC/DC power supplies.
For engineers reviewing the TL431AIDBVRG4 datasheet, TL431AIDBVRG4 pinout, TL431AIDBVRG4 application, or TL431AIDBVRG4 equivalent, key selection criteria include reference accuracy grade (A = 1%), thermal drift performance over industrial temperature range, cathode current capability, dynamic impedance stability under load transients, and compatibility with standard resistor-divider feedback networks.
Technical Context
The TL431AIDBVRG4 implements an internal error amplifier with precision bandgap reference, comparing the REF pin voltage to VREF (2.495 V) and driving the cathode to maintain regulation. Its three-terminal shunt architecture replaces discrete Zener diodes in closed-loop regulation, enabling precise voltage setting via two external resistors without requiring a dedicated supply rail.
Designed for high-stability feedback paths, it exhibits low 14 mV max reference voltage deviation over −40°C to +85°C (TL431AI grade), 2 µA typical reference input current, and sharp turn-on characteristics that support fast transient response in switching regulator error amplifiers and voltage monitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets accurate feedback threshold for power supply regulation |
| Temp Range | −40°C to +85°C - qualified for industrial ambient environments without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under cathode current changes up to 100 mA |
| Cathode Current | 1–100 mA - supports direct sinking into optocoupler LEDs or error amplifier inputs |
| Ref Input Current | 2–4 µA - enables high-impedance resistor-divider networks without significant loading error |
| Voltage Adjustment | 2.495 V to 36 V - configurable output via external R1/R2 divider without auxiliary bias |
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 node | Connects to primary-side feedback path; sinks regulated current to control PWM duty cycle |
| Pin 2: Anode | Common return/reference ground | Typically tied to system ground or secondary-side common; defines voltage reference point |
| Pin 3: Ref | Reference input comparator | Monitors divided output voltage; triggers regulation when ≥2.495 V |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference | 1% initial tolerance (A grade) enables ±1% output voltage accuracy in power supplies without trimming |
| Low dynamic impedance | 0.2 Ω typical minimizes load-induced output variation in high-bandwidth feedback loops |
| Wide adjustment range | 2.495 V to 36 V via resistor divider eliminates need for multiple fixed-reference parts |
| Industrial temperature rating | −40°C to +85°C operation supports reliable performance in motor drives and industrial SMPS |
| Low noise & drift | 14 mV max VREF deviation over full temp range ensures stable regulation across thermal cycles |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V–12 V intermediate bus converters delivering >500 W. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sensing to optocoupler-driven PWM controller. Use Value: Enables ±1% output regulation across line/load/temperature while supporting compact SOT-23 layout. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/5 A AC/DC power supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference in secondary-side feedback network with TL431AIDBVRG4 driving TLV272 op-amp error amplifier. Use Value: Maintains tight regulation despite wide input voltage swings (85–264 VAC) and ambient temperatures up to 70°C. |
| AC Inverter Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 3-phase VFDs with 600 V DC link. IC Role / Device Role / Timing Role: Precision reference for comparator-based fault detection circuit triggered at 420 V threshold. Use Value: 1% tolerance ensures consistent trip point across production units and temperature, reducing false shutdowns. | Use Scenario: Feedback reference for analog torque/current loop in multi-axis servo amplifiers. IC Role / Device Role / Timing Role: Stable 2.495 V reference for DAC output scaling and current-sense amplifier offset calibration. Use Value: Low 2 µA input current prevents loading errors in high-impedance calibration paths, improving current loop accuracy to ±0.2%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 0°C to 70°C temp range; 2% initial tolerance (standard grade) | Limited to commercial-grade systems with tighter thermal management | Select when cost sensitivity outweighs industrial temp or 1% accuracy requirements |
| TL431BIDBVR | 0.5% initial tolerance; same −40°C to +85°C range | Higher accuracy needed for medical or test equipment power rails | Choose when ±0.5% output regulation is mandatory and budget allows premium grade |
Compared with TL431CDBVR, TL431AIDBVRG4 offers tighter 1% tolerance and extended low-temp operation; compared with TL431BIDBVR, it trades 0.5% accuracy for lower unit cost while retaining full industrial temperature qualification.
Availability
TL431AIDBVRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TL431AIDBVRG4 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 heritage in precision reference design.
The TL431 product line was engineered specifically for high-accuracy, low-drift shunt regulation in power supply feedback paths, targeting industrial, computing, and motor control applications demanding reliability across wide temperature ranges.
FAQ
What is the reference voltage tolerance of TL431AIDBVRG4 at 25°C?
The TL431AIDBVRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output with minimum 2.470 V and maximum 2.520 V under specified test conditions (VKA = VREF, IKA = 10 mA). This A-grade accuracy is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the TL431AIDBVRG4 variant.
Does TL431AIDBVRG4 support operation at −40°C?
Yes, TL431AIDBVRG4 is rated for operation from −40°C to +85°C, as indicated by the "I" suffix in its part number (TL431AI). Its reference voltage deviation remains within 14–34 mV over this full industrial temperature range, verified per Section 6.6 Electrical Characteristics in the official TI datasheet.
What is the maximum cathode current capability of TL431AIDBVRG4?
The TL431AIDBVRG4 supports continuous cathode current from 1 mA to 100 mA, as specified in Section 6.4 Recommended Operating Conditions. Absolute maximum rating allows up to 150 mA briefly, but sustained operation above 100 mA requires thermal derating based on RθJA = 206°C/W for the SOT-23-3 package.
Can TL431AIDBVRG4 replace a Zener diode in feedback circuits?
Yes, TL431AIDBVRG4 is explicitly designed as a superior replacement for Zener diodes in voltage regulation feedback paths. Its active error amplifier provides sharper turn-on, lower dynamic impedance (0.2 Ω vs typical Zener's 10–100 Ω), and adjustable output - all confirmed in the TI datasheet Description section and Figure 6-16 stability analysis.
What package type does TL431AIDBVRG4 use?
TL431AIDBVRG4 uses the SOT-23-3 package (2.90 mm × 1.30 mm body size), as documented in TI's Device Information table and Mechanical, Packaging, and Orderable Information section. The "DBVR" in the part number denotes this specific SOT-23-3 variant with tape-and-reel packaging.
TL431AIDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
TL431AIDBVRG4 FAQ
1.How can I place an order for TL431AIDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIDBVRG4 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 TL431AIDBVRG4 reliable?
The price and inventory of TL431AIDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL431AIDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIDBVRG4?
TL431AIDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIDBVRG4 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 TL431AIDBVRG4?
For technical support, including TL431AIDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIDBVRG4 requirements.
6.How does Aetrix verify that TL431AIDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL431AIDBVRG4 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 TL431AIDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL431AIDBVRG4?
All TL431AIDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIDBVRG4, 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 TL431AIDBVRG4 part is unused and in its original packaging.
Return procedure for TL431AIDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AIDBVRG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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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