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Texas Instruments TL431IDBVRG4
- Part No.:
- TL431IDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431IDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
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Product details
Overview
TL431IDBVRG4 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 TL431IDBVRG4 datasheet, TL431IDBVRG4 pinout, TL431IDBVRG4 application, or TL431IDBVRG4 equivalent, key selection criteria include temperature drift (14 mV over −40°C to 85°C), low output noise, cathode voltage headroom requirements, and compatibility with optocoupler-based secondary-side regulation architectures.
Technical Context
The TL431IDBVRG4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V bandgap reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low dynamic impedance enable stable closed-loop control in switching power supply feedback paths without external compensation in many designs.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the cathode-anode path conducts proportionally to maintain regulation. The SOT-23-3 package (DBV) uses standard pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = REF - distinct from TL432 variants and incompatible with DBZ pinout variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Temp Range | −40°C to +85°C - qualified for industrial-grade power supply operation |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage deviation under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or discrete transistor bases |
| Voltage Adjustment | 2.495 V to 36 V - enabled by two external resistors; enables flexible output programming |
| Output Noise | Low broadband noise - critical for high-accuracy regulation in sensitive analog systems |
| Temp Drift (VIdev) | 14 mV max over full range - translates to ~17 ppm/°C average coefficient for stability-critical designs |
Pinout & Package
SOT-23-3 (DBV) package, 2.90 mm × 1.30 mm body size, surface-mount, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Current Sink Output | Main regulated current path; connects to transformer secondary or optocoupler anode |
| Pin 2: Anode | Common Reference Node | Typically tied to system ground or return path; defines voltage reference point for REF pin |
| Pin 3: REF | Threshold Input | Monitors divided output voltage; triggers conduction when >2.495 V relative to Anode |
Key Features
| Feature | Design Value |
|---|---|
| Initial Accuracy | ±1% at 25°C (A-grade) - reduces need for post-production trimming in production power supplies |
| Thermal Stability | 14 mV max drift over −40°C to +85°C - maintains regulation accuracy across environmental stress testing |
| Low Dynamic Impedance | 0.2 Ω typical - minimizes output voltage perturbation during fast load steps in SMPS applications |
| Wide Sink Current Range | 1–100 mA - accommodates diverse optocoupler CTRs and enables direct interface with logic-level drivers |
| Adjustable Output | 2.495 V to 36 V via resistor divider - eliminates need for multiple fixed-reference parts in multi-output designs |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/5 V/3.3 V isolated DC/DC modules. IC Role / Device Role / Timing Role: Shunt reference in optocoupler feedback loop controlling primary-side PWM duty cycle. Use Value: Enables tight output voltage tolerance (<±1%) across line/load/temperature while supporting high-density board layouts. |
Use Scenario: Output voltage sensing and regulation in DIN-rail mounted 24 V/48 V industrial power supplies. IC Role / Device Role / Timing Role: Precision voltage setpoint generator for linear post-regulators and switching controller feedback networks. Use Value: Maintains stable output under wide ambient temperature swings (−40°C to +85°C) and long-term aging conditions. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection reference in 3-phase motor drives. IC Role / Device Role / Timing Role: Threshold comparator input for fault detection circuitry; provides stable trip point independent of supply rail variation. Use Value: Delivers repeatable 310 V or 650 V DC bus overvoltage thresholds with <±10 mV drift over lifetime. |
Use Scenario: Isolated feedback for auxiliary 5 V/3.3 V rails powering gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: Programmable reference for isolated flyback or forward converter secondary regulation. Use Value: Supports compact, low-noise auxiliary supplies meeting IEC 61800-5-1 insulation and EMC requirements. |
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 pinout | Higher accuracy required for lab-grade instrumentation or medical power supplies | Select when tighter initial regulation (±0.5%) justifies cost premium and thermal drift budget allows |
| TL431QDBVR | Extended temperature range (−40°C to +125°C), same A-grade accuracy and SOT-23-3 footprint | Under-hood automotive or high-temp industrial environments exceeding 85°C ambient | Choose for Q-temp qualification where junction temperature may exceed 85°C in sealed enclosures |
Compared with TL431ACDBVR and TL431QDBVR, the TL431IDBVRG4 offers optimal balance of industrial-grade temperature coverage, 1% accuracy, and cost efficiency for general-purpose power supply feedback - avoiding over-specification where extended temp or ultra-high accuracy is unnecessary.
Availability
TL431IDBVRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for TL431IDBVRG4 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 experience in precision reference design.
The TL431 product line was engineered for high-stability, low-drift voltage referencing in isolated power supply feedback paths - targeting industrial, computing, and motor control applications demanding reliability across extended temperature ranges.
FAQ
What is the reference voltage tolerance of TL431IDBVRG4 at 25°C?
The TL431IDBVRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output with a guaranteed range of 2.470 V to 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.
What is the operating temperature range for TL431IDBVRG4?
The TL431IDBVRG4 is rated for operation from −40°C to +85°C (I-grade), making it suitable for industrial environments. Its reference voltage drift is characterized up to ±14 mV over this full range, as documented in the TL431I electrical characteristics tables (Section 6.6).
Does TL431IDBVRG4 support adjustable output voltage?
Yes, the TL431IDBVRG4 supports fully adjustable output voltage from 2.495 V to 36 V using two external resistors in a voltage divider network connected to the REF pin. The cathode-anode voltage is regulated based on the REF pin voltage relative to the anode, enabling flexible output programming without changing the IC.
What package type and pinout does TL431IDBVRG4 use?
The TL431IDBVRG4 uses the SOT-23-3 (DBV) package with standard TL431 pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = REF. This differs from TL432 variants and is incompatible with SOT-23-3 TL432 pinout (Cathode/REF/Anode), as confirmed in Table 5-1 and Figure 5-1 of the datasheet.
What is the typical dynamic impedance of TL431IDBVRG4?
The TL431IDBVRG4 has a typical dynamic impedance of 0.2 Ω, measured at f ≤ 1 kHz with cathode current ranging from 1 mA to 100 mA. This low value ensures minimal output voltage variation during rapid load changes, a critical parameter for stable regulation in switching power supplies.
TL431IDBVRG4 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431IDBVRG4 FAQ
1.How can I place an order for TL431IDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBVRG4 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 TL431IDBVRG4 reliable?
The price and inventory of TL431IDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL431IDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBVRG4?
TL431IDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBVRG4 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 TL431IDBVRG4?
For technical support, including TL431IDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBVRG4 requirements.
6.How does Aetrix verify that TL431IDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL431IDBVRG4 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 TL431IDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL431IDBVRG4?
All TL431IDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBVRG4, 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 TL431IDBVRG4 part is unused and in its original packaging.
Return procedure for TL431IDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBVRG4 Tags
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TL431AIDBZR
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LM4040CYM3-4.1-TR
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AZ431LBNTR-G1
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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
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