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Texas Instruments TL431BQDBVTE4
- Part No.:
- TL431BQDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431BQDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,713
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Product details
Overview
TL431BQDBVTE4 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 at 25°C, 14–34 mV total temperature drift over −40°C to +125°C, and 0.2 Ω typical dynamic impedance. It operates as an adjustable feedback element in isolated DC/DC converters for industrial AC/DC power supplies.
For engineers reviewing the TL431BQDBVTE4 datasheet, TL431BQDBVTE4 pinout, TL431BQDBVTE4 application, or TL431BQDBVTE4 equivalent, key selection criteria include automotive-grade temperature range (−40°C to 125°C), low output noise, sharp turn-on characteristic for stable regulation, and compatibility with standard two-resistor feedback networks up to 36 V.
Technical Context
The TL431BQDBVTE4 implements a high-gain transconductance amplifier with internal 2.495 V bandgap reference, enabling precise voltage regulation via external resistor divider connected to the REF pin. Its three-terminal shunt architecture sinks cathode current (1–100 mA) proportional to error between REF input and internal reference, maintaining stable output voltage across wide load and line variations.
Designed for Q-temp automotive qualification, it features guaranteed operation from −40°C to +125°C, low 2–4 µA reference input current, and robust stability with minimal external compensation-verified across 0.001–100 µF capacitive loads per TI's stability boundary curves for Q-grade SOT-23-3 devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV (0.5% tolerance at 25°C); sets precise feedback threshold in power supply control loops |
| Temp Range | −40°C to +125°C; qualified for under-hood automotive and industrial environments without derating |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under fast load transients |
| Cathode Current | 1–100 mA sink capability; supports direct drive of optocoupler LEDs in isolated flyback feedback paths |
| Ref Input Current | 2–4 µA; enables high-impedance resistor dividers (e.g., 1 MΩ top resistor) without significant error |
| Temp Drift | 14–34 mV over full range; translates to <±25 ppm/°C average TC for stable long-term accuracy |
| Output Noise | Low broadband noise; critical for low-noise LDOs and precision ADC references |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, RoHS-compliant, with gull-wing leads. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference (REF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to primary-side controller feedback or optocoupler anode; sinks regulated current to maintain VKA ≈ Vref |
| Anode (Pin 2) | Common return/reference ground | Typically tied to system ground or secondary-side common; defines voltage reference point for REF input |
| REF (Pin 3) | High-impedance error-sense input | Monitors divided output voltage; draws only 2–4 µA, enabling high-ratio feedback dividers |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy | B-grade tolerance enables tight output regulation without post-manufacturing trimming in cost-sensitive power modules |
| Automotive Q-Temp Rating | Guaranteed −40°C to +125°C operation meets AEC-Q100 stress test requirements for engine control and ADAS power rails |
| 0.2 Ω Dynamic Impedance | Minimizes output voltage deviation during rapid load steps-critical for server VRMs and servo drive feedback |
| Adjustable 2.5–36 V Output | Configurable via two external resistors; replaces discrete Zener diodes while improving accuracy and thermal stability |
| Low 2–4 µA REF Current | Reduces divider power loss and improves efficiency in battery-powered or energy-harvesting applications |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V–12 V DC/DC converters for telecom/datacom servers. IC Role / Device Role / Timing Role: Shunt reference providing feedback signal to optocoupler, closing regulation loop across isolation barrier. Use Value: 0.5% accuracy and low temp drift ensure ±1% output voltage stability over full operating temperature range. | Use Scenario: Output voltage regulation in industrial 3-phase rectifier-based AC/DC power supplies. IC Role / Device Role / Timing Role: Precision shunt reference in feedback network of PWM controller ICs like UC384x series. Use Value: 100 mA sink current directly drives optocoupler LED without buffer transistor, simplifying BOM. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in variable-frequency motor drives. IC Role / Device Role / Timing Role: Adjustable threshold detector setting trip point for IGBT gate driver shutdown logic. Use Value: 2.5–36 V adjustability allows single BOM part to cover 380 V, 480 V, and 690 V AC input systems. | Use Scenario: Isolated feedback for auxiliary 5 V/3.3 V bias rails powering position encoder interfaces and FPGA I/O banks. IC Role / Device Role / Timing Role: Stable reference for secondary-side TLVH431 or LDO error amplifiers in multi-rail servo power stages. Use Value: Low 0.2 Ω impedance prevents interaction with downstream LDOs, ensuring clean low-noise analog supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVTE4 | Same electrical specs but rated for −40°C to +85°C (I-temp), not automotive Q-temp | Not qualified for under-hood or extended-temperature industrial use | Select when ambient temperature stays below 85°C and AEC-Q100 compliance is unnecessary |
| TLVH431AQDBVR | Lower 1.24 V reference, 1% initial tolerance, 30 V max cathode voltage, SOT-23-3 | Used where lower reference voltage or tighter headroom is required (e.g., 3.3 V systems) | Choose for low-voltage feedback paths; not interchangeable due to different Vref and voltage range |
Compared with TL431BIDBVTE4 and TLVH431AQDBVR, TL431BQDBVTE4 uniquely combines automotive temperature range, 0.5% accuracy, and 36 V cathode rating-making it the only option among the three qualified for high-reliability 12–48 V isolated power supplies in harsh environments.
Availability
TL431BQDBVTE4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for TL431BQDBVTE4 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 highly stable, adjustable shunt references for feedback control in switching power supplies, battery chargers, and industrial power systems-designed for accuracy, thermal robustness, and ease of implementation.
FAQ
What is the reference voltage tolerance of TL431BQDBVTE4 at 25°C?
The TL431BQDBVTE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with ±12 mV deviation. This B-grade accuracy is specified in Section 6.13 of the TI SLVS543S datasheet and is guaranteed across the full −40°C to +125°C operating range for automotive applications. The TL431BQDBVTE4 maintains this tolerance without external calibration.
Does TL431BQDBVTE4 support operation at 125°C junction temperature?
Yes, TL431BQDBVTE4 is explicitly characterized for operation from −40°C to +125°C ambient temperature (Q-temp grade), with maximum junction temperature rated at 150°C. Its thermal resistance (RθJA = 206°C/W for SOT-23-3) and absolute maximum ratings allow reliable continuous operation at 125°C ambient when power dissipation remains within limits-verified in TI's recommended operating conditions table.
What is the minimum cathode current required for regulation in TL431BQDBVTE4?
The TL431BQDBVTE4 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Section 6.13 (Electrical Characteristics, TL431BQ/TL432BQ). This low Imin enables stable operation even with high-value feedback resistors or light-load conditions in standby modes of AC/DC adapters and industrial power supplies.
Can TL431BQDBVTE4 replace a Zener diode in feedback circuits?
Yes, TL431BQDBVTE4 is engineered as a precision replacement for Zener diodes in feedback networks, offering superior 0.5% initial accuracy, lower temperature drift (14–34 mV vs. typical Zener's >50 mV), and sharp turn-on characteristics. Unlike Zeners, it provides adjustable output (2.5–36 V) via two external resistors and maintains regulation down to 0.4 mA cathode current-making TL431BQDBVTE4 ideal for modern isolated SMPS designs.
What package type does TL431BQDBVTE4 use and what are its dimensions?
TL431BQDBVTE4 uses the SOT-23-3 package with nominal body size 2.90 mm × 1.30 mm. This RoHS-compliant, surface-mount package features gull-wing leads and is optimized for automated assembly in space-constrained power supply PCBs. Pin configuration is Cathode (Pin 1), Anode (Pin 2), REF (Pin 3), as confirmed in TI's Pin Configuration and Functions section (Figure 5-1, DBZ variant).
TL431BQDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431BQDBVTE4 FAQ
1.How can I place an order for TL431BQDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BQDBVTE4 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 TL431BQDBVTE4 reliable?
The price and inventory of TL431BQDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BQDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL431BQDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BQDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BQDBVTE4?
TL431BQDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BQDBVTE4 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 TL431BQDBVTE4?
For technical support, including TL431BQDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BQDBVTE4 requirements.
6.How does Aetrix verify that TL431BQDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL431BQDBVTE4 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 TL431BQDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL431BQDBVTE4?
All TL431BQDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BQDBVTE4, 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 TL431BQDBVTE4 part is unused and in its original packaging.
Return procedure for TL431BQDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BQDBVTE4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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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
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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