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Texas Instruments TL431QDBVRG4
- Part No.:
- TL431QDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431QDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
TL431QDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B-grade), −40°C to +125°C operating range, 0.2 Ω typical dynamic impedance, and 1 mA to 100 mA sink-current capability. It serves as an adjustable feedback element in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431QDBVRG4 datasheet, TL431QDBVRG4 pinout, TL431QDBVRG4 application, or TL431QDBVRG4 equivalent, key selection criteria include automotive-grade temperature stability, low output noise, sharp turn-on characteristic for Zener replacement, and compatibility with standard resistor-divider feedback networks.
Technical Context
The TL431QDBVRG4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor. Its Q-temp grade ensures operation across −40°C to +125°C, and its B-grade accuracy (±0.5% at 25°C) is maintained via trimmed bandgap reference and matched transistor pairs.
It functions as a high-gain transconductance amplifier with cathode current controlled by the voltage difference between REF and ANODE pins. The device achieves stable regulation with external resistive feedback, requiring no additional compensation in most linear or switching supply topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V, B-grade at 25°C); sets precise feedback threshold for output regulation. |
| Initial Tolerance | ±0.5% at 25°C; enables tight output voltage control without post-manufacturing trimming. |
| Temp Range | −40°C to +125°C (Q-grade); qualified for under-hood automotive and industrial environments. |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under load transients. |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs and PWM controller feedback inputs. |
| Ref Input Current | 2–4 µA; allows use of high-value feedback resistors (>1 MΩ) to minimize power loss. |
| Output Noise | Low broadband noise (typ. <10 µVRMS over 10 Hz–10 kHz); critical for low-noise analog feedback loops. |
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 switched node or optocoupler anode; sinks regulated current to maintain REF–ANODE voltage at Vref. |
| Pin 2 (REF) | Reference input | Senses voltage divider output; regulates when voltage equals 2.495 V relative to ANODE. |
| Pin 3 (ANODE) | Common return | Typically tied to system ground or power rail return; defines reference potential for REF pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Settable from 2.495 V to 36 V using two external resistors - enables single-part support across multiple output rails. |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) and fast response enable stable regulation without external compensation in most flyback designs. |
| Low temperature drift | Max 34 mV deviation over −40°C to +125°C (Q-grade); maintains <0.1% output variation in automotive thermal cycling. |
| Low output impedance | 0.2 Ω typical dynamic impedance - minimizes interaction with optocoupler CTR variations and PCB trace resistance. |
| Robust ESD rating | ±2000 V HBM - withstands handling and board assembly without special precautions. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V–12 V DC/DC modules for telecom servers. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven PWM controller for precise output regulation. Use Value: ±0.5% initial accuracy and Q-temp stability ensure <±1% output deviation across full thermal and load range. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/48 V industrial power supplies. IC Role / Device Role / Timing Role: Adjustable shunt reference in primary-side feedback loop with TL431-compatible controller ICs. Use Value: 100 mA sink capability drives optocoupler LED directly without buffer, reducing BOM count and layout area. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 3-phase motor inverters. IC Role / Device Role / Timing Role: Precision reference for comparator-based fault detection circuitry. Use Value: Low 2.495 V reference enables accurate scaling of high-voltage sense signals using standard resistor ratios. | Use Scenario: Feedback reference for multi-rail auxiliary supplies powering gate drivers and position encoders. IC Role / Device Role / Timing Role: Programmable shunt regulator setting 3.3 V, 5 V, or 15 V outputs via external resistors. Use Value: Single TL431QDBVRG4 replaces multiple fixed Zeners, simplifying inventory and design reuse across servo platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Same SOT-23-3 package but C-grade (0°C–70°C, ±2% tolerance); lower cost, commercial temp only. | Not suitable for automotive or extended industrial environments; limited to ambient-controlled indoor equipment. | Select TL431CDBVR only if operating temperature stays within 0°C–70°C and ±2% output tolerance is acceptable. |
| TLVH431QDBVR | Lower 1.24 V reference voltage, same Q-temp grade and SOT-23-3 package; higher 100 µA max Iref. | Enables lower-voltage feedback networks (e.g., 3.3 V or 2.5 V rails); not interchangeable without resistor recalculations. | Choose TLVH431QDBVR when designing sub-2.5 V regulated outputs or needing reduced reference headroom. |
Compared with TL431CDBVR and TLVH431QDBVR, the TL431QDBVRG4 uniquely combines automotive-grade temperature range, ±0.5% accuracy, and 2.495 V reference in SOT-23-3 - making it optimal for safety-critical or thermally demanding feedback paths where precision and reliability are non-negotiable.
Availability
TL431QDBVRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431QDBVRG4 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 and embedded processing technologies, with decades of leadership in precision reference and power management ICs.
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 TL431QDBVRG4 at 25°C?
The TL431QDBVRG4 has a ±0.5% initial reference voltage tolerance at 25°C (B-grade specification), corresponding to a 2.483 V to 2.507 V range around the nominal 2.495 V output. This tolerance is guaranteed per TI's production test flow and applies specifically to the Q-grade, SOT-23-3 packaged TL431QDBVRG4 variant.
Does TL431QDBVRG4 support operation beyond 125°C junction temperature?
No. The TL431QDBVRG4 is rated for operation from −40°C to +125°C ambient (Q-grade), with a maximum junction temperature of 150°C. Exceeding 150°C TJ risks permanent parametric shift or failure. Thermal design must ensure θJA = 206°C/W (SOT-23-3) and appropriate PCB copper area to maintain safe junction temperatures under worst-case load and ambient conditions.
Can TL431QDBVRG4 replace a Zener diode in a linear regulator feedback network?
Yes. The TL431QDBVRG4 is explicitly designed as a superior Zener diode replacement, offering sharper knee characteristics, lower dynamic impedance (0.2 Ω vs. >10 Ω for typical Zeners), and adjustable output (2.495 V to 36 V). Its active regulation eliminates Zener voltage drift with current and temperature, making it ideal for precision linear and switching regulator feedback paths.
What is the minimum cathode current required for regulation in TL431QDBVRG4?
The TL431QDBVRG4 requires a minimum cathode current (IKA) of 0.4 mA to maintain regulation, with typical performance up to 100 mA. Below 0.4 mA, the device exits regulation and REF pin voltage deviates from 2.495 V. This value is consistent across Q-grade variants and verified in TI's Electrical Characteristics tables (Section 6.7).
Is TL431QDBVRG4 pin-compatible with other TL431 variants in SOT-23-3 package?
Yes. TL431QDBVRG4 uses the standard TL431 SOT-23-3 pinout (CATHODE–REF–ANODE), matching TL431CDBVR, TL431IDBVR, and all TL431x DBV variants. Pin compatibility is confirmed in TI's Pin Configuration and Functions section (Figure 5-1), and no layout changes are needed when upgrading from C- or I-grade to Q-grade in the same package.
TL431QDBVRG4 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431QDBVRG4 FAQ
1.How can I place an order for TL431QDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431QDBVRG4 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 TL431QDBVRG4 reliable?
The price and inventory of TL431QDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431QDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL431QDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431QDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431QDBVRG4?
TL431QDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431QDBVRG4 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 TL431QDBVRG4?
For technical support, including TL431QDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431QDBVRG4 requirements.
6.How does Aetrix verify that TL431QDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL431QDBVRG4 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 TL431QDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL431QDBVRG4?
All TL431QDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431QDBVRG4, 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 TL431QDBVRG4 part is unused and in its original packaging.
Return procedure for TL431QDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431QDBVRG4 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
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LM4040D20IDBZR
Texas Instruments
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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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