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Texas Instruments TL431QDBVTG4
- Part No.:
- TL431QDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431QDBVTG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
TL431QDBVTG4 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 full-range temperature drift (–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 or Zener replacement in automotive-grade secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL431QDBVTG4 datasheet, TL431QDBVTG4 pinout, TL431QDBVTG4 application, or TL431QDBVTG4 equivalent, key selection criteria include its Q-temp automotive qualification (–40°C to 125°C), SOT-23-3 footprint compatibility, 2.495 V reference accuracy, low output impedance for stable feedback loops, and direct use in voltage monitoring and comparator circuits with integrated reference.
Technical Context
The TL431QDBVTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output transistor. Its cathode-anode voltage range spans 2.5 V to 36 V, set externally via two resistors, and it maintains regulation with minimum cathode current of 0.4 mA.
It features sharp turn-on characteristics and low 0.2 Ω dynamic impedance, enabling precise voltage referencing without external compensation in most configurations. The device operates with reference input current as low as 2 µA and exhibits ≤0.5% initial voltage tolerance at 25°C under 10 mA cathode load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495 V nominal, ±0.5% tolerance at 25°C - enables high-accuracy feedback in power supply regulation |
| Temp Range | –40°C to +125°C (Q-grade) - qualified for under-hood automotive applications |
| VKA Range | 2.5 V to 36 V - supports wide-output adjustable supplies using two external resistors |
| IKA Sink | 1 mA to 100 mA - provides sufficient current drive for optocoupler biasing in isolated SMPS feedback |
| Dynamic Z | 0.2 Ω typical - ensures minimal output voltage variation under load transients |
| VI(dev) | ≤14 mV over full temperature range - guarantees stable reference across automotive thermal extremes |
| IREF | 2–4 µA - reduces resistor-divider loading error in high-impedance voltage-setting networks |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free and RoHS-compliant. Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to regulated output node; sinks current to maintain VREF at pin 2 |
| Reference (Pin 2) | Threshold input | Compares against internal 2.495 V reference; sets output voltage via R1/R2 divider |
| Anode (Pin 3) | Common return path | Typically tied to system ground or low-side return; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Q-temp qualification | Specified and tested from –40°C to +125°C - meets AEC-Q100 stress requirements for automotive electronics |
| Low dynamic impedance | 0.2 Ω typical - minimizes output voltage perturbation during transient load changes |
| Sharp turn-on characteristic | Enables clean switching behavior - improves stability vs. Zener diodes in feedback paths |
| Adjustable output range | 2.5 V to 36 V - supports single-device design reuse across multiple output rails |
| Low reference input current | 2–4 µA - allows high-value resistor dividers, reducing power loss and thermal drift |
Applications
| Secondary-Side Flyback Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated DC-DC converter where TL431QDBVTG4 senses output voltage on secondary side and drives optocoupler LED to regulate primary-side controller. IC Role / Device Role / Timing Role: Precision shunt reference providing accurate voltage threshold for feedback loop closure. Use Value: Enables ±1% output regulation over line, load, and temperature - superior to discrete Zener-based solutions. |
Use Scenario: On-board 5 V or 12 V rail stabilization where space-constrained SOT-23-3 replaces through-hole Zener diodes. IC Role / Device Role / Timing Role: Adjustable shunt regulator acting as programmable voltage clamp. Use Value: Delivers tighter voltage tolerance (±0.5%), lower tempco (14 mV), and sharper knee than standard Zeners. |
| Automotive Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Battery voltage supervision circuit in engine control units detecting undervoltage/overvoltage conditions. IC Role / Device Role / Timing Role: Stable reference source for comparator input in fault-detection logic. Use Value: Q-grade operation ensures reliable trip-point accuracy across extreme vehicle ambient temperatures. |
Use Scenario: Threshold detection circuit comparing sensor signal against fixed reference without external voltage source. IC Role / Device Role / Timing Role: Self-contained reference + active shunt element functioning as precision comparator input stage. Use Value: Eliminates need for separate reference IC and reduces BOM count while maintaining 2.495 V accuracy. |
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 reference, but higher tempco (6 mV max) and no automotive qualification | Restricted to non-automotive industrial or consumer systems with limited temperature range | Select when cost sensitivity outweighs extended temperature or automotive reliability requirements |
| TLVH431AQDBVRQ1 | Pin-compatible Q-grade alternative with 1.24 V reference, lower IREF (100 nA), and wider VKA range (1.24 V to 30 V) | Requires redesign of resistor divider; better suited for low-voltage or ultra-low-power monitoring | Choose when lower reference voltage or nanoamp-level input current is critical to system power budget |
Compared with TL431CDBVR, TL431QDBVTG4 adds automotive temperature range and tighter long-term stability; versus TLVH431AQDBVRQ1, it offers higher reference voltage and proven robustness in legacy flyback designs, though with higher reference current.
Availability
TL431QDBVTG4 is available at Aetrix Electronics and suitable for automotive power management, isolated SMPS feedback, and industrial voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431QDBVTG4 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and automotive electronics.
The TL431 family was designed as a precision programmable shunt reference for feedback, regulation, and voltage supervision in power converters, battery systems, and safety-critical automotive subsystems.
FAQ
What is the reference voltage tolerance of TL431QDBVTG4 at 25°C?
The TL431QDBVTG4 has a ±0.5% initial reference voltage tolerance at 25°C (B-grade specification), corresponding to a 2.495 V nominal value with deviation between 2.483 V and 2.507 V. This tolerance is verified per TI's SLVS543P datasheet Section 7.13 for TL431BQ devices and applies directly to TL431QDBVTG4 as a Q-grade B-tolerance variant.
Does TL431QDBVTG4 support operation across the full automotive temperature range?
Yes, TL431QDBVTG4 is explicitly characterized for operation from –40°C to +125°C (Q-grade), meeting automotive environmental requirements. Its electrical specifications-including reference voltage deviation (≤14 mV), dynamic impedance (0.2 Ω), and cathode current capability (1–100 mA)-are guaranteed across this full range per Section 7.7 of the TI datasheet.
What package type and pin configuration does TL431QDBVTG4 use?
TL431QDBVTG4 uses the SOT-23-3 package (2.90 mm × 1.30 mm) with pin 1 = Cathode, pin 2 = Reference, and pin 3 = Anode. This matches the DBZ variant pinout shown in Figure 5 of the TI SLVS543P datasheet and is distinct from TL432 or 5-pin SOT-23 variants.
Can TL431QDBVTG4 replace a standard Zener diode in voltage regulation circuits?
Yes, TL431QDBVTG4 functions as a precision programmable Zener replacement. With adjustable output (2.5 V to 36 V), sharp turn-on, 0.2 Ω dynamic impedance, and ±0.5% tolerance, it outperforms discrete Zeners in accuracy, temperature stability, and noise-especially in feedback loops of flyback converters where TL431QDBVTG4 is widely deployed.
What is the minimum cathode current required for regulation in TL431QDBVTG4?
The TL431QDBVTG4 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Sections 7.5–7.13 of the TI datasheet across all grades and temperature ranges. This ensures stable operation even in high-resistance feedback networks common in optocoupler-driven SMPS designs.
TL431QDBVTG4 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
TL431QDBVTG4 FAQ
1.How can I place an order for TL431QDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431QDBVTG4 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 TL431QDBVTG4 reliable?
The price and inventory of TL431QDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431QDBVTG4 is usually 5 days.
3.What payment methods are accepted for TL431QDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431QDBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431QDBVTG4?
TL431QDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431QDBVTG4 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 TL431QDBVTG4?
For technical support, including TL431QDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431QDBVTG4 requirements.
6.How does Aetrix verify that TL431QDBVTG4 is sourced from the original manufacturer or authorized distributors?
All TL431QDBVTG4 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 TL431QDBVTG4 meets industry standards.
7.What is the process for return or replacement of TL431QDBVTG4?
All TL431QDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431QDBVTG4, 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 TL431QDBVTG4 part is unused and in its original packaging.
Return procedure for TL431QDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431QDBVTG4 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
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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
-
AZ431LANTR-G1
Diodes Incorporated
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