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Texas Instruments TL1431QDRG4Q1
- Part No.:
- TL1431QDRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL1431QDRG4Q1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
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Product details
Overview
TL1431QDRG4Q1 from Texas Instruments is an AEC-Q100 qualified automotive-grade programmable shunt voltage reference IC, delivering 0.4% initial voltage tolerance, 0.2 Ω typical output impedance, and fast 500 ns turnon. It operates across −40°C to 125°C and supports adjustable output voltages from 2.5 V to 36 V using two external resistors-ideal for precision onboard regulation in engine control units and ADAS power supplies.
For engineers reviewing the TL1431QDRG4Q1 datasheet, TL1431QDRG4Q1 pinout, TL1431QDRG4Q1 application, or TL1431QDRG4Q1 equivalent, key selection criteria include its automotive temperature rating, cathode current capability (1–100 mA), low reference current (≤4 µA), and SOIC-8 package compatibility with high-reliability power management designs.
Technical Context
The TL1431QDRG4Q1 implements a precision bandgap reference core with internal error amplifier and active cathode driver, enabling sharp turnon and stable regulation under dynamic load conditions. Its architecture supports both shunt regulator and precision feedback configurations in isolated DC/DC converters and three-terminal regulator augmentation circuits.
It features internally connected ANODE terminals (pins 2, 3, 6, 7), a dedicated REF input (pin 1), CATHODE output (pin 8), and two NC pins (4, 5). The device maintains <55 mV reference voltage deviation over −40°C to 125°C and exhibits ≤2 µA off-state cathode leakage at 36 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Initial Voltage Tolerance | ±0.4% - ensures tight output setting accuracy without post-manufacturing trimming in automotive systems. |
| Reference Voltage (VI(ref)) | 2.47 V to 2.53 V at 25°C - defines minimum programmable output threshold and sets baseline for resistor-divider design. |
| Output Impedance |zKA| | 0.2 Ω typical - enables stable regulation under fast load transients up to 100 mA cathode current. |
| Turnon Time | 500 ns - supports high-frequency feedback loops in PWM controllers and crowbar protection circuits. |
| Cathode Current Range | 1 mA to 100 mA - allows direct use in medium-power shunt regulation without external pass devices. |
| Reference Input Current | ≤4 µA at 25°C - minimizes divider resistor power loss and thermal drift in battery-sensitive applications. |
| Operating Temperature | −40°C to 125°C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain electronics. |
Pinout & Package
TL1431QDRG4Q1 is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.9 mm width, and 1.75 mm max height, compliant with JEDEC MS-012 AA and RoHS requirements. Pin 1 is marked with a beveled corner or dot; pins 4 and 5 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance node sensing voltage divider output; sets regulated cathode voltage via VK = VREF(1 + R1/R2). |
| Pins 2, 3, 6, 7 (ANODE) | Anode connection | Internally tied together; serves as common return path for reference and cathode current-must connect to system ground or lowest potential rail. |
| Pin 8 (CATHODE) | Regulated output terminal | Sinks adjustable current up to 100 mA; functions as precision shunt node in feedback paths of switching regulators and linear controllers. |
| Pins 4, 5 (NC) | No internal connection | Unused silicon pads; must remain unconnected-no routing or copper pour required on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Precision bandgap reference | 2.5 V nominal with ±0.4% initial tolerance and ≤55 mV total deviation over −40°C to 125°C-enables 0.5% system-level output accuracy. |
| Active cathode driver | 0.2 Ω typical output impedance and 500 ns turnon-supports stable closed-loop response in 100 kHz+ PWM converters. |
| Wide output voltage range | Programmable from 2.5 V to 36 V using only two external resistors-replaces multiple Zener diodes and simplifies BOM across vehicle platforms. |
| Automotive qualification | AEC-Q100 Grade 1 certified with MSL Level-1 rating and NIPDAU lead finish-ensures reliability in harsh under-hood environments. |
| Low reference current | ≤4 µA at 25°C-permits use of high-value resistor dividers (>100 kΩ), reducing quiescent power and self-heating errors. |
Applications
| Onboard DC/DC Regulation | PWM Controller Feedback |
|---|---|
|
Use Scenario: Regulating 12 V battery-derived rails for microcontrollers and sensors in body control modules. IC Role / Device Role / Timing Role: Shunt reference providing precise feedback voltage to LM2596 or similar buck controller. Use Value: Maintains ±0.5% output stability across temperature and line variations without trimming, reducing calibration steps in production. |
Use Scenario: Setting accurate 5 V or 3.3 V reference for TL598 or UC384x-based flyback controllers in infotainment power supplies. IC Role / Device Role / Timing Role: Precision voltage reference in optocoupler-coupled secondary-side feedback loop. Use Value: Enables 0.5% output tolerance in isolated converters, meeting CISPR-25 conducted emission limits through tighter regulation margins. |
| Three-Terminal Regulator Enhancement | Crowbar Overvoltage Protection |
|
Use Scenario: Adjusting output of fixed 5 V µA7805 regulator to 8 V for camera module bias supply in rear-view systems. IC Role / Device Role / Timing Role: Programmable reference replacing internal bandgap to reconfigure output voltage of legacy LDOs. Use Value: Eliminates need for custom LDOs-extends life of existing designs while supporting new voltage requirements. |
Use Scenario: Triggering SCR-based crowbar circuit during 12 V rail overvoltage events in start-stop battery management. IC Role / Device Role / Timing Role: Adjustable threshold detector comparing bus voltage against programmed trip point (e.g., 15.5 V). Use Value: Provides <1 µs response to overvoltage with <0.1 V hysteresis-prevents MCU latch-up before fuse interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVRQ1 | 0.5% initial tolerance, 0.3 Ω typical output impedance, same SOIC-8 package and −40°C to 125°C rating. | Higher tolerance and impedance limit use in <0.5% output accuracy systems or >50 kHz feedback loops. | Select when cost sensitivity outweighs need for 0.4% tolerance or sub-0.25 Ω impedance. |
| LM4040QCEM3-ADJ/NO | Shunt reference with 0.2% tolerance but fixed 2.5 V output; SOT-23-3 package; 100 µA max cathode current. | Lacks adjustability and current drive-unsuitable for >2.5 V outputs or >10 mA loads without external amplification. | Choose only for space-constrained 2.5 V reference needs where programmability and higher current are unnecessary. |
Compared with TL1431QDRG4Q1, TL431BQDBVRQ1 trades minor tolerance and impedance degradation for lower unit cost, while LM4040QCEM3-ADJ/NO offers superior initial accuracy at the expense of adjustability, current capability, and package compatibility-making TL1431QDRG4Q1 optimal for flexible, high-current automotive voltage setting.
Availability
TL1431QDRG4Q1 is available at Aetrix Electronics and suitable for automotive power management, ADAS domain controllers, and engine control unit (ECU) designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL1431QDRG4Q1 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 automotive qualification expertise and broad manufacturing scale.
The TL1431-Q1 product line delivers AEC-Q100 qualified programmable shunt references designed specifically for safety-critical automotive power regulation, feedback control, and voltage monitoring applications.
FAQ
What is the maximum cathode voltage rating for TL1431QDRG4Q1?
The absolute maximum cathode-to-anode voltage (VKA) for TL1431QDRG4Q1 is 37 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum is 36 V, aligned with its specified adjustable output range and automotive system voltage surge margins.
Can TL1431QDRG4Q1 replace a Zener diode in shunt regulator designs?
Yes, TL1431QDRG4Q1 directly replaces Zener diodes in shunt regulator applications. Its 0.2 Ω output impedance, 0.4% tolerance, and active turnon provide superior regulation accuracy, thermal stability, and transient response compared to passive Zeners-especially critical in automotive environments where temperature swings exceed 165°C.
What is the minimum cathode current required for regulation in TL1431QDRG4Q1?
The minimum cathode current (Imin) required for stable regulation in TL1431QDRG4Q1 is 0.45 mA at 25°C, rising to 1 mA across the full −40°C to 125°C range. External circuitry must guarantee this current under all operating conditions-including cold cranking-to maintain reference accuracy and avoid dropout.
Does TL1431QDRG4Q1 support operation with a single 3.3 V supply?
No. TL1431QDRG4Q1 requires cathode voltage ≥ VI(ref) (≥2.47 V) to regulate, but its functional operation depends on sufficient headroom between cathode and anode to sustain internal amplifier bias. With a 3.3 V supply, regulation is possible only if the anode is at ground and cathode is configured as the output node-standard shunt topology-not as a series regulator.
How does the TL1431QDRG4Q1 differ from the commercial-grade TL1431?
TL1431QDRG4Q1 differs from commercial TL1431 by full AEC-Q100 Grade 1 qualification (−40°C to 125°C), enhanced test screening, MSL Level-1 moisture sensitivity rating, and guaranteed parametric performance across automotive temperature extremes. Electrical specs are identical, but TL1431QDRG4Q1 includes lot-level traceability and automotive-specific reliability reporting.
TL1431QDRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL1431QDRG4Q1 FAQ
1.How can I place an order for TL1431QDRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1431QDRG4Q1 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 TL1431QDRG4Q1 reliable?
The price and inventory of TL1431QDRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1431QDRG4Q1 is usually 5 days.
3.What payment methods are accepted for TL1431QDRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1431QDRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1431QDRG4Q1?
TL1431QDRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1431QDRG4Q1 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 TL1431QDRG4Q1?
For technical support, including TL1431QDRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1431QDRG4Q1 requirements.
6.How does Aetrix verify that TL1431QDRG4Q1 is sourced from the original manufacturer or authorized distributors?
All TL1431QDRG4Q1 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 TL1431QDRG4Q1 meets industry standards.
7.What is the process for return or replacement of TL1431QDRG4Q1?
All TL1431QDRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with TL1431QDRG4Q1, 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 TL1431QDRG4Q1 part is unused and in its original packaging.
Return procedure for TL1431QDRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1431QDRG4Q1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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