My Inquiry
My Account
Texas Instruments TL431AQDBVTG4
- Part No.:
- TL431AQDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AQDBVTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431AQDBVTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C (A grade), 14 mV max reference voltage deviation over −40°C to +125°C, 0.2 Ω typical dynamic impedance, and sink-current capability from 1 mA to 100 mA. It serves as an adjustable voltage reference in secondary-side regulation of automotive-grade flyback SMPSs.
For engineers reviewing the TL431AQDBVTG4 datasheet, TL431AQDBVTG4 pinout, TL431AQDBVTG4 application, or TL431AQDBVTG4 equivalent, this page delivers verified electrical specifications, thermal performance data across Q-temp range, validated pin functions for DBZ package, and direct alternatives with documented functional and parametric differences.
Technical Context
The TL431AQDBVTG4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference amplifier and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop feedback in isolated power supplies without external compensation.
Designed for automotive applications, it operates across −40°C to +125°C (Q-temp grade) and maintains ≤34 mV total reference voltage drift over that range. The device requires only two external resistors to set output voltage from 2.47 V to 36 V, with reference input current as low as 2 µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2.47–2.52 V at 25°C (A grade); sets precise feedback threshold in voltage regulation loops |
| Initial Tolerance | ±1% at 25°C; ensures tight output voltage accuracy without trimming in production |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive power supply use |
| Ref Voltage Drift | ≤34 mV over full temperature range; guarantees <±0.14% output stability in wide-temp environments |
| Dynamic Impedance | 0.2 Ω typical; minimizes load-induced voltage variation during transient response |
| Sink Current Range | 1–100 mA; supports direct interface with optocoupler LEDs in isolated feedback paths |
| Reference Input Current | 2–4 µA typical; enables high-resistance voltage divider networks without loading error |
Pinout & Package
SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, surface-mount, tape-and-reel compatible. Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode - all pins electrically active with no NC terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to optocoupler LED anode or regulation point; sinks up to 100 mA |
| Reference (Pin 2) | Threshold input | Compares external divider voltage against internal 2.495 V reference; high-impedance (2–4 µA) |
| Anode (Pin 3) | Common return path | Typically tied to system ground or power rail return; defines reference potential for all internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temp Range | −40°C to +125°C operation with guaranteed 34 mV Vref drift - meets AEC-Q100 stress test requirements |
| Low Dynamic Impedance | 0.2 Ω typical - suppresses ripple and noise coupling into feedback loop, improving PSRR |
| Sharp Turn-On Characteristic | Enables clean switching between regulation states - critical for fast transient response in SMPS |
| Zener Replacement Capability | Adjustable 2.47–36 V output with superior tempco vs. discrete Zeners - reduces BOM count in voltage monitoring |
| Low Reference Input Current | 2–4 µA typical - permits >1 MΩ divider networks, minimizing standby power loss |
Applications
| Secondary-Side Regulation | Voltage Monitoring |
|---|---|
Use Scenario: Feedback control in isolated flyback converters where primary-side sensing is impractical. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise voltage threshold to drive optocoupler LED. Use Value: Enables ±1% output voltage regulation across line/load/temperature without primary-side controller complexity. |
Use Scenario: Overvoltage/undervoltage detection in battery management or DC bus supervision. IC Role / Device Role / Timing Role: Precision threshold comparator with integrated reference, interfacing to MCU GPIO or comparator input. Use Value: Eliminates need for external reference IC or trimmed resistor network, reducing component count and calibration effort. |
| Zener Diode Replacement | Adjustable Power Supply Reference |
Use Scenario: Replacing fixed-voltage Zener diodes in linear regulators or clamping circuits. IC Role / Device Role / Timing Role: Programmable shunt regulator offering stable 2.47–36 V output via two external resistors. Use Value: Delivers 10× lower temperature coefficient and 5× lower dynamic impedance versus standard Zeners. |
Use Scenario: Setting output voltage in lab-grade or programmable bench power supplies. IC Role / Device Role / Timing Role: High-accuracy, low-drift reference source for DAC-controlled voltage setting networks. Use Value: Supports 0.1% resolution voltage adjustment with minimal drift over time and temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Same SOT-23-3 package, but C-temp grade (0°C to 70°C) and tighter 0.5% initial tolerance (B grade not A) | Limited to commercial-temperature industrial or consumer systems; unsuitable for under-hood automotive use | Select when ambient temperature stays below 70°C and higher initial accuracy justifies cost premium |
| TL431QDBVR | Same Q-temp rating (−40°C to +125°C) and SOT-23-3 package, but standard 2% initial tolerance (no A/B grade marking) | Acceptable for non-critical automotive subsystems where ±2% output tolerance is permissible | Choose for cost-sensitive automotive modules where full 1% accuracy is not required |
Compared with TL431AQDBVTG4, TL431ACDBZR trades extended temperature capability for improved initial accuracy, while TL431QDBVR retains full automotive qualification at reduced precision - enabling selection based on accuracy vs. environmental robustness trade-offs.
Availability
TL431AQDBVTG4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage monitoring, and precision adjustable supply designs requiring stable component supply across extended temperature ranges.
Supply support for TL431AQDBVTG4 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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision analog ICs and power management.
The TL431 product line was engineered specifically for high-stability, low-drift voltage referencing in isolated power supplies and safety-critical feedback systems - emphasizing automotive-grade reliability and design-in longevity.
FAQ
What is the operating temperature range for TL431AQDBVTG4?
The TL431AQDBVTG4 is rated for operation from −40°C to +125°C (Q-temp grade), making it suitable for under-hood automotive applications and industrial environments with extreme thermal cycling. This range is confirmed in Section 7.10 of the SLVS543P datasheet and validated across production lots per AEC-Q100 stress testing protocols.
How does TL431AQDBVTG4 differ from standard TL431 variants?
The TL431AQDBVTG4 combines A-grade (±1%) initial reference voltage tolerance with Q-temp (−40°C to +125°C) qualification in SOT-23-3 (DBZ) packaging. Standard TL431 parts may offer C/I-temp grades or B/A/blank tolerance variants, but only TL431AQDBVTG4 delivers this specific combination of accuracy, temperature range, and footprint.
Can TL431AQDBVTG4 replace a Zener diode directly?
Yes - TL431AQDBVTG4 functions as a programmable Zener replacement with superior performance: adjustable 2.47–36 V output, 0.2 Ω dynamic impedance (vs. 10–100 Ω for Zeners), and ≤34 mV reference drift over −40°C to +125°C. External resistor network design follows standard TL431 configuration guidelines in TI's Application Report SLVA458.
What is the minimum cathode current required for regulation in TL431AQDBVTG4?
The TL431AQDBVTG4 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, per Section 7.10 of the SLVS543P datasheet. This value is consistent across Q-temp variants and ensures reliable startup and dropout behavior in low-power feedback circuits.
Is TL431AQDBVTG4 pin-compatible with other TL431 packages?
TL431AQDBVTG4 uses the SOT-23-3 (DBZ) pinout: Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode. It is not pin-compatible with SOT-23-5, SOIC-8, or TO-92 variants due to differing pin counts and assignments - PCB layout must match DBZ mechanical dimensions and pad pattern per TI's packaging drawing SCBD001C.
TL431AQDBVTG4 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
TL431AQDBVTG4 FAQ
1.How can I place an order for TL431AQDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDBVTG4 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 TL431AQDBVTG4 reliable?
The price and inventory of TL431AQDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDBVTG4 is usually 5 days.
3.What payment methods are accepted for TL431AQDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDBVTG4?
TL431AQDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDBVTG4 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 TL431AQDBVTG4?
For technical support, including TL431AQDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDBVTG4 requirements.
6.How does Aetrix verify that TL431AQDBVTG4 is sourced from the original manufacturer or authorized distributors?
All TL431AQDBVTG4 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 TL431AQDBVTG4 meets industry standards.
7.What is the process for return or replacement of TL431AQDBVTG4?
All TL431AQDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDBVTG4, 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 TL431AQDBVTG4 part is unused and in its original packaging.
Return procedure for TL431AQDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDBVTG4 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
