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Texas Instruments TL431QDBVRE4
- Part No.:
- TL431QDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431QDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
TL431QDBVRE4 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 secondary-side regulation of automotive-grade flyback SMPSs.
For engineers reviewing the TL431QDBVRE4 datasheet, TL431QDBVRE4 pinout, TL431QDBVRE4 application, or TL431QDBVRE4 equivalent, this page provides verified electrical specifications, thermal performance data for Q-temp operation, validated pin functions for DBZ package, and direct alternatives with documented functional alignment and temperature-range trade-offs.
Technical Context
The TL431QDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN output transistor. Its active output stage delivers sharp turn-on characteristics and low 0.2 Ω dynamic impedance, enabling stable closed-loop feedback in isolated power supplies.
Designed for automotive applications, it operates across −40°C to 125°C with guaranteed 14 mV reference voltage drift and supports cathode voltages up to 36 V. The device requires only two external resistors to set output voltage from 2.495 V to 36 V, with reference input current under 4 µA at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V nominal; sets precise feedback threshold in voltage regulation loops |
| Initial Tolerance | ±0.5% at 25°C (B grade); enables high-accuracy output voltage setting without trimming |
| Temp Range | −40°C to 125°C (Q grade); qualified for under-hood automotive power systems |
| VKA Max | 36 V cathode-to-anode voltage; supports wide-input isolated DC/DC designs |
| IKA Range | 1–100 mA sink current; sufficient for optocoupler LED drive and error amplifier biasing |
| VI(dev) | ≤14 mV max deviation over full temperature range; ensures stable regulation across thermal stress |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage perturbation during load transients |
| Iref | 2–4 µA reference input current; reduces resistor-divider power loss and thermal drift |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, gull-wing leads, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 - Cathode | Shunt current output node | Connects to SMPS feedback node or optocoupler anode; sinks regulated current |
| Pin 2 - Reference | Precision voltage sense input | Compares against internal 2.495 V bandgap; sets output voltage via R1/R2 divider |
| Pin 3 - Anode | Common return path | Typically tied to system ground or power supply return; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.495 V to 36 V via two external resistors; eliminates need for multiple fixed references |
| Low Temperature Drift | 14 mV max Vref deviation over −40°C to 125°C; maintains accuracy in engine-control modules |
| Sharp Turn-On Characteristic | Active output stage enables fast response to feedback errors; improves transient regulation |
| Zener Replacement Capability | Superior stability, lower noise, and tighter tolerance vs. discrete Zener diodes |
| Low Output Noise | Enables clean feedback in sensitive analog control loops without added filtering |
Applications
| Automotive Engine Control Unit (ECU) | Flyback SMPS Secondary-Side Regulation |
|---|---|
Use Scenario: Regulating 5 V microcontroller supply in under-hood ECU with ambient temperature cycling from −40°C to 125°C. IC Role / Device Role / Timing Role: Adjustable shunt reference providing stable feedback voltage to optocoupler-driven PWM controller. Use Value: ±0.5% initial tolerance and 14 mV max Vref drift ensure <±1.5% output voltage variation across full automotive temperature range. |
Use Scenario: Isolated voltage sensing in 12 V/3 A offline flyback converter for infotainment system power rail. IC Role / Device Role / Timing Role: Precision reference in TL431-based optocoupler feedback loop controlling primary-side MOSFET duty cycle. Use Value: 0.2 Ω dynamic impedance and 1–100 mA sink capability enable tight regulation (<±2%) despite line/load transients. |
| Industrial PLC Analog Input Module | Battery Management System (BMS) Voltage Monitor |
Use Scenario: Providing calibrated 2.5 V reference for 16-bit ADC in industrial process sensor interface. IC Role / Device Role / Timing Role: High-stability voltage reference for ratiometric measurement of RTD or strain gauge signals. Use Value: Low 4 µA reference input current minimizes resistor-divider self-heating and improves long-term measurement repeatability. |
Use Scenario: Monitoring individual cell voltage in 12S Li-ion battery pack operating from −30°C to 70°C. IC Role / Device Role / Timing Role: Programmable threshold detector comparing cell voltage against 3.0 V setpoint using external resistors. Use Value: Guaranteed operation to 125°C allows placement near hot battery cells without derating or calibration drift. |
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 0.5% B-grade tolerance and SOT-23-3 package | Lacks automotive qualification; unsuitable for under-hood use or extended temperature validation | Select when cost-sensitive non-automotive designs require identical electrical behavior at lower ambient range |
| TLVH431QDBVR | Lower 1.24 V reference voltage, 1.5% initial tolerance, same Q-temp rating and SOT-23-3 footprint | Requires different resistor divider; higher reference current (100 nA typ) and reduced cathode voltage range (up to 20 V) | Choose when system requires sub-2.5 V reference or lower power consumption, accepting wider tolerance and reduced voltage headroom |
Compared with TL431QDBVRE4, TL431CDBVR sacrifices automotive temperature coverage for lower cost, while TLVH431QDBVR trades reference voltage and accuracy for ultra-low quiescent current-neither is pin-compatible, but both serve overlapping regulation roles with distinct design trade-offs.
Availability
TL431QDBVRE4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial sensor signal conditioning, and battery voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431QDBVRE4 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 ICs, with decades of automotive qualification expertise and broad manufacturing scale.
The TL431 product line delivers precision programmable shunt references optimized for isolated power supply feedback, voltage monitoring, and comparator applications where stability, low drift, and wide operating temperature are critical.
FAQ
What is the reference voltage tolerance of TL431QDBVRE4 at 25°C?
The TL431QDBVRE4 has a ±0.5% initial reference voltage tolerance at 25°C, corresponding to the B grade per TI's TL431 family nomenclature. This means its Vref falls between 2.483 V and 2.507 V when measured under standard conditions with 10 mA cathode current and VKA = Vref. This tolerance is confirmed in Section 7.13 (Electrical Characteristics, TL431BQ) of the SLVS543P datasheet.
Does TL431QDBVRE4 support operation at 125°C?
Yes, TL431QDBVRE4 is rated for continuous operation from −40°C to 125°C, as indicated by the "Q" suffix in its part number and verified in Section 7.4 (Recommended Operating Conditions) and Section 7.13 of the datasheet. Its maximum reference voltage deviation remains ≤14 mV across this full range, making it suitable for under-hood automotive applications.
What package type does TL431QDBVRE4 use, and how many pins does it have?
TL431QDBVRE4 uses the SOT-23-3 (DBZ) package, a 3-pin surface-mount outline measuring 2.90 mm × 1.30 mm. Pin configuration is Cathode (Pin 1), Reference (Pin 2), and Anode (Pin 3), as shown in Figure 5 of the SLVS543P datasheet and confirmed in the Device Information table on page 2.
Can TL431QDBVRE4 replace a Zener diode in a power supply design?
Yes, TL431QDBVRE4 is explicitly designed as a high-performance Zener diode replacement. Its active output stage provides sharper turn-on, lower dynamic impedance (0.2 Ω vs. typical Zener's >10 Ω), tighter voltage tolerance (±0.5% vs. ±5% for standard Zeners), and lower temperature drift-enabling more accurate and stable regulation in onboard supplies and switching converters.
What is the maximum cathode-to-anode voltage rating for TL431QDBVRE4?
The absolute maximum cathode-to-anode voltage (VKA) for TL431QDBVRE4 is 37 V, with recommended operating range up to 36 V per Section 7.1 (Absolute Maximum Ratings) and Section 7.4 of the datasheet. Exceeding 36 V in normal operation risks reliability degradation, though brief transients within the 37 V limit are survivable.
TL431QDBVRE4 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
TL431QDBVRE4 FAQ
1.How can I place an order for TL431QDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431QDBVRE4 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 TL431QDBVRE4 reliable?
The price and inventory of TL431QDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431QDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL431QDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431QDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431QDBVRE4?
TL431QDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431QDBVRE4 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 TL431QDBVRE4?
For technical support, including TL431QDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431QDBVRE4 requirements.
6.How does Aetrix verify that TL431QDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL431QDBVRE4 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 TL431QDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL431QDBVRE4?
All TL431QDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431QDBVRE4, 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 TL431QDBVRE4 part is unused and in its original packaging.
Return procedure for TL431QDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431QDBVRE4 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
-
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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