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Texas Instruments TL431QDBVTE4
- Part No.:
- TL431QDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431QDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
TL431QDBVTE4 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), 14 mV max reference voltage deviation over −40°C to 125°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference in automotive-grade secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL431QDBVTE4 datasheet, TL431QDBVTE4 pinout, TL431QDBVTE4 application, or TL431QDBVTE4 equivalent, this page delivers verified electrical specs, thermal performance at 125°C, SOT-23-3 terminal mapping, automotive temperature qualification, and direct alternatives for high-reliability power control designs.
Technical Context
The TL431QDBVTE4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V bandgap reference and transconductance amplifier driving an NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop feedback in isolated DC/DC converters.
Qualified for −40°C to 125°C operation (Q-grade), it features 14 mV max Vref deviation across temperature, 2–4 µA reference input current, and 0.4–0.7 mA minimum cathode current for regulation-enabling robust performance in automotive under-hood and industrial control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V nominal; sets precise feedback threshold for voltage regulation circuits |
| Initial tolerance | ±0.5% at 25°C (B grade); enables tight output voltage control without trimming |
| Vref deviation | 14 mV max over −40°C to 125°C; ensures <±0.56% drift in automotive thermal environments |
| Dynamic impedance | 0.2 Ω typical; maintains stable regulation under fast load transients |
| Cathode current range | 1–100 mA sink capability; supports direct drive of optocoupler LEDs in isolated feedback loops |
| Iref | 2–4 µA; minimizes resistor-divider power loss and improves accuracy in high-impedance networks |
| Min. cathode current | 0.4–0.7 mA; defines lowest current needed to sustain regulation in low-power standby modes |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output | Connects to switched node (e.g., optocoupler anode) to sink error amplifier current |
| Pin 2 (REF) | Reference input threshold | Compares external divider voltage against 2.495 V; triggers regulation when exceeded |
| Pin 3 (ANODE) | Common return path | Typically tied to system ground or low-side return; establishes reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature range | −40°C to 125°C operation (Q-grade); qualified for engine control, ADAS, and battery management systems |
| Zener diode replacement | Sharp turn-on and 0.2 Ω impedance enable superior line/load regulation vs. discrete Zeners |
| Adjustable output | 2.495 V to 36 V via two external resistors; eliminates need for multiple fixed-reference ICs |
| Low output noise | Enables clean feedback in sensitive analog control loops without added filtering |
| Low Iref | 2–4 µA input current reduces power loss and thermal drift in high-value resistor dividers |
Applications
| Automotive Flyback Regulation | Industrial Power Supply Monitoring |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated 12 V → 5 V/3.3 V flyback converters for vehicle infotainment ECUs. IC Role / Device Role / Timing Role: Shunt reference providing feedback signal to optocoupler, enabling precise output voltage control across wide temperature and load ranges. Use Value: Maintains ±1% output accuracy over −40°C to 125°C while supporting 100 mA sink current for fast optocoupler response. |
Use Scenario: Overvoltage protection and brown-out detection in PLC power modules operating in factory environments. IC Role / Device Role / Timing Role: Adjustable comparator with integrated 2.495 V reference, comparing rail voltage against user-defined thresholds. Use Value: Enables dual-threshold monitoring (e.g., 24 V OK / 28 V OVP) using one resistor network and no external reference. |
| Programmable Current Sink | Onboard Voltage Reference |
|
Use Scenario: Constant-current LED driver for status indicators in medical diagnostic equipment requiring stable light output. IC Role / Device Role / Timing Role: Precision shunt regulator configured with sense resistor to set accurate LED current independent of supply variation. Use Value: Delivers <±2% current accuracy over temperature due to low Vref drift and minimal Iref contribution. |
Use Scenario: Local reference for ADCs and DACs in motor drive control boards where board space limits use of larger SOIC packages. IC Role / Device Role / Timing Role: Compact, low-drift voltage source replacing bulkier 3-pin TO-92 or 8-pin SOIC references. Use Value: SOT-23-3 footprint saves >70% PCB area vs. SOIC-8 while maintaining B-grade accuracy and Q-temp qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Commercial grade (0°C to 70°C), same SOT-23-3 package and 2.495 V Vref, but 6 mV max Vref deviation | Not qualified for automotive or extended industrial use; limited to ambient-temperature consumer/office equipment | Select TL431CDBVR only if operating temperature stays within 0°C–70°C and cost sensitivity outweighs thermal stability needs |
| TLVH431QDBVR | Lower 1.24 V reference voltage, 1.5% initial tolerance, 30 ppm/°C tempco, same Q-grade −40°C to 125°C rating | Used where lower reference voltage simplifies resistor selection or enables tighter low-voltage regulation (e.g., 1.8 V rails) | Choose TLVH431QDBVR when system requires sub-2.5 V reference or higher tempco tolerance is acceptable for cost reduction |
Compared with TL431QDBVTE4, TL431CDBVR trades automotive temperature range for tighter room-temp drift, while TLVH431QDBVR offers lower Vref and relaxed accuracy-making TL431QDBVTE4 optimal for high-stability 2.5 V–36 V regulation in harsh environments.
Availability
TL431QDBVTE4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage monitoring, and programmable current-sink applications requiring stable component supply across extended temperature ranges.
Supply support for TL431QDBVTE4 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 was engineered for high-accuracy, temperature-stable shunt regulation in safety-critical power systems-including automotive, industrial, and telecom infrastructure-where reliability and long-term stability are mandatory.
FAQ
What is the maximum cathode voltage rating for TL431QDBVTE4?
The absolute maximum cathode-to-anode voltage (VKA) for TL431QDBVTE4 is 37 V. Operation above this level risks permanent damage. The recommended operating range is 2.495 V to 36 V, aligning with its use as an adjustable shunt reference in regulated power supplies. Always maintain VKA ≤ 36 V in functional designs to ensure reliability and longevity of the TL431QDBVTE4.
Does TL431QDBVTE4 require external capacitors for stability?
TL431QDBVTE4 does not require external compensation capacitors for basic shunt operation, but a 1 nF ceramic capacitor between CATHODE and REF is recommended when driving capacitive loads (e.g., optocoupler input capacitance) to prevent oscillation. This stabilizes the feedback loop in flyback converters without altering the TL431QDBVTE4's inherent 0.2 Ω dynamic impedance.
How does the Q-grade temperature specification impact TL431QDBVTE4 usage in automotive designs?
The Q-grade (−40°C to 125°C) qualification means TL431QDBVTE4 is tested and guaranteed to meet all electrical specifications-including 14 mV max Vref deviation and 0.4–0.7 mA minimum cathode current-across that full range. This makes TL431QDBVTE4 suitable for under-hood applications like engine control units and battery management systems where ambient temperatures exceed 85°C.
Can TL431QDBVTE4 replace a standard Zener diode in existing designs?
Yes, TL431QDBVTE4 can directly replace Zener diodes rated 2.5 V to 36 V, offering superior performance: sharper knee, lower dynamic impedance (0.2 Ω vs. 5–50 Ω), and tighter tolerance (±0.5% vs. ±5%). No circuit redesign is needed beyond connecting REF to the Zener cathode node and ANODE to ground-preserving layout while upgrading regulation accuracy in the TL431QDBVTE4 implementation.
What is the role of the reference input current (Iref) in TL431QDBVTE4 resistor-divider calculations?
Iref (2–4 µA) flows into the REF pin and must be included in resistor-divider current budgeting. For example, with R1 = 10 kΩ and R2 = 10 kΩ, total divider current is ~250 µA-so Iref contributes <2% error. Using lower resistor values (e.g., 1–5 kΩ) further minimizes Iref-induced error, ensuring precise output voltage setting in TL431QDBVTE4-based regulators.
TL431QDBVTE4 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
TL431QDBVTE4 FAQ
1.How can I place an order for TL431QDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431QDBVTE4 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 TL431QDBVTE4 reliable?
The price and inventory of TL431QDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431QDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL431QDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431QDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431QDBVTE4?
TL431QDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431QDBVTE4 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 TL431QDBVTE4?
For technical support, including TL431QDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431QDBVTE4 requirements.
6.How does Aetrix verify that TL431QDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL431QDBVTE4 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 TL431QDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL431QDBVTE4?
All TL431QDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431QDBVTE4, 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 TL431QDBVTE4 part is unused and in its original packaging.
Return procedure for TL431QDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431QDBVTE4 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
-
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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