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Texas Instruments TL431BIDBVRG4
- Part No.:
- TL431BIDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431BIDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,494
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Product details
Overview
TL431BIDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, 2.483–2.507 V reference voltage (Vref), and operation across –40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance, supports 1–100 mA cathode sink current (IKA), and serves as a Zener diode replacement in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL431BIDBVRG4 datasheet, TL431BIDBVRG4 pinout, TL431BIDBVRG4 application, or TL431BIDBVRG4 equivalent, this page provides verified electrical specifications, thermal behavior, pin-function mapping for DBZ package, real-world use cases in power supply feedback loops, and validated alternative parts with documented functional and packaging differences.
Technical Context
The TL431BIDBVRG4 implements an adjustable shunt regulator architecture with internal error amplifier, reference voltage source, and output transistor. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when input exceeds Vref by ≥100 mV - enabling precise voltage monitoring and closed-loop feedback control.
It operates as a two-terminal device in Zener-replacement mode (ANODE grounded, REF tied to cathode via resistor divider) or three-terminal regulator (ANODE connected to system ground or return path). The B-grade accuracy and I-temp range make it suitable for industrial power supplies requiring stable 2.5 V reference under thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.483–2.507 V at 25°C - enables ±0.5% output voltage setting in adjustable regulators |
| VKA max | 36 V - supports regulation up to 36 V output in high-voltage flyback designs |
| IKA range | 1–100 mA - provides sufficient sink capability for optocoupler biasing in isolated SMPS feedback |
| VI(dev) | 14 mV over –40°C to 85°C - ensures ≤0.56% reference drift across full industrial temperature range |
| |zKA| | 0.2 Ω typical - minimizes output voltage variation under load transients in precision references |
| Iref | 2–4 µA - reduces divider network power loss and improves efficiency in battery-powered systems |
| Imin | 0.4–0.7 mA - defines minimum cathode current needed to maintain regulation, critical for light-load stability |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, gull-wing leads, JEDEC MO-178 compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Current sink output | Connects to feedback node or optocoupler LED anode; carries full regulation current |
| Pin 2: REF | Reference voltage sense input | High-impedance input (2–4 µA); sets regulation threshold relative to ANODE potential |
| Pin 3: ANODE | Common reference terminal | Typically grounded; serves as voltage reference point for REF and cathode current return path |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Vref tolerance (B grade) | Enables ±0.5% output voltage accuracy in adjustable power supplies without trimming |
| 0.2 Ω dynamic impedance | Reduces output voltage deviation during fast load steps in precision analog circuits |
| –40°C to 85°C operating range (I grade) | Guarantees stable reference performance in industrial ambient conditions |
| 14 mV Vref deviation over temperature | Supports <±0.6% total reference error in wide-temperature applications |
| Low 2–4 µA reference current | Permits high-value resistor dividers, minimizing quiescent power in always-on monitoring circuits |
Applications
| Industrial Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 12–24 V DC-DC converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to drive optocoupler LED current proportional to output voltage. Use Value: Enables ±1% output regulation across line/load/temperature without primary-side sensing complexity. |
Use Scenario: Replacing discrete 2.4–2.7 V Zener diodes in low-power voltage clamping or level-shifting circuits. IC Role / Device Role / Timing Role: Precision shunt regulator with sharp turn-on characteristic and lower dynamic impedance than Zeners. Use Value: Improves voltage accuracy by >10× and reduces temperature coefficient drift versus standard Zener diodes. |
| Adjustable Linear Regulator Reference | Overvoltage Monitoring Circuit |
Use Scenario: Setting output voltage of LM317-type adjustable linear regulators via external resistor divider. IC Role / Device Role / Timing Role: High-stability reference replacing internal bandgap in legacy regulators to improve accuracy. Use Value: Achieves ±0.5% output voltage tolerance independent of LM317's internal 1.25 V reference drift. |
Use Scenario: Detecting overvoltage events on 3.3 V or 5 V rails in microcontroller-based systems. IC Role / Device Role / Timing Role: Comparator with integrated reference - REF pin compares rail voltage against 2.5 V threshold. Use Value: Eliminates need for external voltage reference and comparator IC, reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 0.5% Vref tolerance but rated only for 0°C to 70°C (C grade); same SOT-23-3 package and pinout | Not qualified for industrial temperature range; unsuitable where ambient exceeds 70°C | Select TL431CDBVR only for commercial-grade applications with limited thermal requirements |
| TL431BIDBVRE4 | Identical electrical specs and temperature rating; differs only in tape-and-reel packaging (E4 = RoHS-compliant reel vs G4 = green reel) | No functional or performance difference; identical in circuit design and layout | TL431BIDBVRE4 is drop-in compatible for production runs requiring alternate packaging logistics |
Compared with TL431CDBVR, TL431BIDBVRG4 adds guaranteed operation down to –40°C and up to 85°C while maintaining 0.5% accuracy; compared with TL431BIDBVRE4, it uses a different reel specification but delivers identical electrical and thermal performance in board-level implementation.
Availability
TL431BIDBVRG4 is available at Aetrix Electronics and suitable for industrial power supplies, isolated DC-DC converters, and overvoltage protection circuits requiring stable component supply with guaranteed long-term availability.
Supply support for TL431BIDBVRG4 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, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer applications.
The TL431 product line delivers precision programmable shunt references optimized for voltage regulation, feedback control, and reference replacement in power management systems - emphasizing accuracy, thermal stability, and ease of integration.
FAQ
What is the reference voltage tolerance of TL431BIDBVRG4 at 25°C?
The TL431BIDBVRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a Vref range of 2.483 V to 2.507 V when tested at IKA = 10 mA and VKA = Vref. This B-grade accuracy is specified in TI's SLVS543P datasheet Section 7.11 and applies exclusively to the TL431BI variant in SOT-23-3 (DBZ) packaging.
Does TL431BIDBVRG4 support operation beyond 85°C?
No, TL431BIDBVRG4 is rated for operation from –40°C to +85°C (I-grade temperature range) per its official TI datasheet. Attempting to operate above 85°C violates recommended conditions and may cause increased VI(dev) beyond the specified 14 mV maximum deviation, risking regulation failure or accelerated parametric drift.
What is the minimum cathode current required for regulation in TL431BIDBVRG4?
The TL431BIDBVRG4 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as confirmed in Section 7.12 of the SLVS543P datasheet. Below this threshold, the device exits active regulation and behaves as an open circuit, causing feedback loop collapse in SMPS applications.
Can TL431BIDBVRG4 be used as a comparator with integrated reference?
Yes, TL431BIDBVRG4 functions as a comparator with integrated 2.5 V reference: when voltage at the REF pin exceeds Vref relative to ANODE, the cathode sinks current. This enables overvoltage detection, window comparators (with dual TL431s), and precision threshold triggering without external reference components.
What is the dynamic impedance of TL431BIDBVRG4 and why does it matter?
TL431BIDBVRG4 exhibits 0.2 Ω typical dynamic impedance (|zKA|) at frequencies ≤1 kHz and IKA = 1–100 mA. This low value ensures minimal output voltage perturbation during rapid load changes - critical for maintaining tight regulation in switching power supply feedback paths and precision analog references.
TL431BIDBVRG4 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:
- ±0.5%
- 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
TL431BIDBVRG4 FAQ
1.How can I place an order for TL431BIDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBVRG4 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 TL431BIDBVRG4 reliable?
The price and inventory of TL431BIDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL431BIDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBVRG4?
TL431BIDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBVRG4 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 TL431BIDBVRG4?
For technical support, including TL431BIDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBVRG4 requirements.
6.How does Aetrix verify that TL431BIDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDBVRG4 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 TL431BIDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL431BIDBVRG4?
All TL431BIDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBVRG4, 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 TL431BIDBVRG4 part is unused and in its original packaging.
Return procedure for TL431BIDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBVRG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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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