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Texas Instruments TL431AQDBVTE4
- Part No.:
- TL431AQDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AQDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,661
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Product details
Overview
TL431AQDBVTE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.47–2.52 V reference voltage (A-grade, ±1% initial tolerance at 25°C), 14–34 mV full-temperature-range deviation (−40°C to +125°C), and 0.2 Ω typical dynamic impedance. It operates as an adjustable 2.5–36 V regulator in secondary-side feedback loops of automotive-grade flyback SMPSs.
For engineers reviewing the TL431AQDBVTE4 datasheet, TL431AQDBVTE4 pinout, TL431AQDBVTE4 application, or TL431AQDBVTE4 equivalent, key selection criteria include its Q-temp automotive qualification (−40°C to 125°C), 0.7 mA maximum minimum cathode current for regulation, 0.5 µA max off-state cathode current at 36 V, and compatibility with two-resistor external programming for stable voltage/current referencing.
Technical Context
The TL431AQDBVTE4 implements a bandgap-based reference core with internal error amplifier and NPN output stage, configured as a three-terminal adjustable shunt regulator. Its REF pin senses voltage relative to ANODE, triggering cathode current sink when input exceeds Vref - enabling precise closed-loop control without external op-amps.
Designed for automotive systems, it features guaranteed operation across −40°C to +125°C, low 2–4 µA reference input current, and high immunity to cathode voltage variation (ΔVref/ΔVKA = −1 to −2.7 mV/V), ensuring stable regulation even under wide input transients in power supply feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.47–2.52 V at 25°C (A-grade, ±1% tolerance); sets minimum programmable output voltage threshold |
| VI(dev) | 14–34 mV over −40°C to +125°C; defines worst-case reference drift in automotive thermal environments |
| IKA Range | 1–100 mA continuous cathode sink current; supports direct drive of optocoupler LEDs or error amplifier inputs |
| |zKA| | 0.2 Ω typical dynamic impedance; ensures <1 mV output perturbation under 10 mA load step changes |
| Imin | 0.4–0.7 mA minimum cathode current for regulation; determines lowest usable feedback loop current |
| Ioff | 0.1–0.5 µA off-state cathode leakage at 36 V; enables low-power disable modes without external switches |
| ΔVref/ΔVKA | −1 to −2.7 mV/V cathode voltage sensitivity; quantifies reference stability under input rail variation |
Pinout & Package
SOT-23-3 (DBV) package: 2.90 mm × 1.30 mm body, gull-wing leads, moisture sensitivity level 1, rated for surface-mount reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current sink output | Connects to SMPS transformer secondary or optocoupler anode; sinks up to 100 mA to maintain REF–ANODE voltage at Vref |
| Pin 2 (REF) | Reference input | Senses voltage divider output; device regulates when voltage at this pin exceeds Vref relative to ANODE |
| Pin 3 (ANODE) | Common return | Typically tied to system ground or power supply return; serves as voltage reference point for REF and cathode current path |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature range | Qualified for −40°C to +125°C operation (Q-grade), meeting AEC-Q100 stress test requirements |
| Low reference input current | 2–4 µA typical Iref enables high-impedance resistor dividers without loading error |
| Sharp turn-on characteristic | Active output stage provides fast, clean regulation onset-critical for stable flyback feedback response |
| Zener diode replacement capability | Replaces discrete Zeners with superior accuracy, lower drift, and programmable output (2.5–36 V) |
| Low output noise | Sub-mV RMS noise supports precision analog sensing and low-noise power monitoring applications |
Applications
| Automotive Flyback SMPS Feedback | Programmable Voltage Monitor |
|---|---|
Use Scenario: Secondary-side regulation in 12 V/48 V automotive DC–DC converters using optocoupled feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to drive optocoupler LED; closes feedback loop independent of primary-side controller timing. Use Value: Enables ±1% output voltage accuracy across temperature, replacing less stable Zener diodes and reducing calibration overhead. |
Use Scenario: Overvoltage detection on battery management system (BMS) cell taps or DC-link rails. IC Role / Device Role / Timing Role: Adjustable comparator with integrated reference; triggers protection circuitry when sensed voltage exceeds programmed threshold. Use Value: Eliminates need for external precision reference and op-amp, reducing BOM count while maintaining 14 mV max drift over −40°C to +125°C. |
| Adjustable Current Sink | Industrial Power Supply Reference |
Use Scenario: Constant-current biasing of laser diodes or LED strings in automotive lighting modules. IC Role / Device Role / Timing Role: Configured as current regulator via cathode-to-load connection; REF pin senses current-sense resistor voltage. Use Value: Delivers stable 0.5% current accuracy with <0.2 Ω effective output impedance, minimizing thermal drift effects. |
Use Scenario: Precision voltage reference in industrial PLC power supplies requiring long-term stability. IC Role / Device Role / Timing Role: Programmable shunt reference setting feedback point for isolated DC–DC controllers (e.g., UC384x family). Use Value: Provides 0.2 Ω dynamic impedance and 0.7 mA min cathode current, enabling robust regulation under variable load and line conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Commercial-grade (0°C to 70°C), tighter 0.5% initial tolerance (C-grade), lower VI(dev) of 6–16 mV | Not qualified for automotive use; suitable for cost-sensitive consumer or industrial non-automotive designs | Select when ambient temperature stays within 0–70°C and higher initial accuracy outweighs extended temperature coverage |
| TL431BQDBVT | Same Q-temp rating (−40°C to 125°C) but 0.5% initial tolerance (B-grade), VI(dev) unchanged at 14–34 mV | Higher accuracy alternative for automotive systems where ±0.5% Vref tolerance is required | Choose when design requires tighter reference voltage tolerance without changing thermal or package constraints |
Compared with TL431AQDBVTE4, TL431ACDBVR trades automotive qualification for improved room-temperature accuracy, while TL431BQDBVT maintains identical temperature performance with enhanced initial Vref precision-enabling targeted upgrades without layout or thermal redesign.
Availability
TL431AQDBVTE4 is available at Aetrix Electronics and suitable for automotive power conversion, battery monitoring, and industrial feedback control requiring stable component supply under extended temperature operation.
Supply support for TL431AQDBVTE4 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 delivers programmable shunt references optimized for voltage regulation, feedback control, and precision monitoring in automotive, industrial, and communications systems.
FAQ
What is the operating temperature range of TL431AQDBVTE4?
The TL431AQDBVTE4 is qualified for operation from −40°C to +125°C (Q-grade), making it suitable for under-hood automotive applications and other harsh-environment systems where thermal stability is critical. This range is explicitly defined in the device's Recommended Operating Conditions table and verified across all electrical characteristics in Section 7.10 of the datasheet.
How does TL431AQDBVTE4 differ from standard TL431 variants?
The TL431AQDBVTE4 combines A-grade initial accuracy (±1% at 25°C), Q-temp qualification (−40°C to +125°C), and SOT-23-3 packaging. Unlike C- or I-grade versions, it guarantees full-temperature performance for automotive use; unlike B-grade parts, it trades 0.5% tolerance for broader application flexibility where ±1% meets system requirements.
Can TL431AQDBVTE4 replace a Zener diode directly?
Yes - the TL431AQDBVTE4 functions as a 2-terminal Zener replacement when ANODE and REF are shorted, but offers superior performance: programmable 2.5–36 V output, ±1% initial tolerance, 14–34 mV max temperature drift, and 0.2 Ω dynamic impedance versus typical Zener's 5–50 Ω and >5% tolerance.
What is the minimum cathode current needed for regulation in TL431AQDBVTE4?
The TL431AQDBVTE4 requires a minimum cathode current (Imin) of 0.4–0.7 mA to maintain regulation, as specified in Section 7.10 of the datasheet. This value ensures stable operation when driving high-impedance feedback networks or low-current optocouplers in isolated power supplies.
Is TL431AQDBVTE4 pin-compatible with other TL431 packages?
TL431AQDBVTE4 uses the SOT-23-3 (DBZ) pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. It is not pin-compatible with SOT-23-5, SOIC-8, or PDIP-8 variants due to differing pin counts and assignments - always verify mechanical layout against the DBZ top-view diagram in Section 6 of the datasheet.
TL431AQDBVTE4 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:
- ±1%
- 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
TL431AQDBVTE4 FAQ
1.How can I place an order for TL431AQDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDBVTE4 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 TL431AQDBVTE4 reliable?
The price and inventory of TL431AQDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL431AQDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDBVTE4?
TL431AQDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDBVTE4 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 TL431AQDBVTE4?
For technical support, including TL431AQDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDBVTE4 requirements.
6.How does Aetrix verify that TL431AQDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL431AQDBVTE4 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 TL431AQDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL431AQDBVTE4?
All TL431AQDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDBVTE4, 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 TL431AQDBVTE4 part is unused and in its original packaging.
Return procedure for TL431AQDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDBVTE4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
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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