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Texas Instruments TL1431QPWRG4
- Part No.:
- TL1431QPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TL1431QPWRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
TL1431QPWRG4 from Texas Instruments is a precision programmable shunt voltage reference IC with 0.4% initial voltage tolerance, 0.2Ω typical output impedance, and fast 500ns turnon. It operates across –40°C to 125°C and supports adjustable output voltages from 2.5V to 36V using two external resistors-commonly deployed in secondary-side regulation of automotive flyback SMPSs.
For engineers reviewing the TL1431QPWRG4 datasheet, TL1431QPWRG4 pinout, TL1431QPWRG4 application, or TL1431QPWRG4 equivalent, key selection criteria include its automotive-grade temperature range, sink current capability (1–100 mA), low reference current (≤2.5 µA typ), and Zener-replacement functionality in space-constrained power control circuits.
Technical Context
The TL1431QPWRG4 integrates a precision 2.5V bandgap reference and high-gain error amplifier in a single monolithic structure. Its internal Darlington output stage enables up to 100mA cathode sink current while maintaining sharp turnon and low dynamic impedance.
It functions in open-loop mode as a comparator with integrated reference or in closed-loop configuration as a shunt regulator-where feedback from cathode to REF sets output voltage via resistor divider. Thermal stability is specified over –40°C to 125°C, with reference voltage deviation ≤55 mV across that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±10 mV at 25°C; enables precise voltage setting in feedback networks |
| Initial Tolerance | ±0.4% at 25°C; ensures tight output accuracy without trimming in production |
| Output Impedance | 0.2 Ω typical (≤0.4 Ω max); minimizes load-induced voltage droop under varying cathode current |
| Cathode Current Range | 1 mA to 100 mA; supports robust regulation across light-load monitoring and heavy-shunt applications |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial environments |
| Turnon Time | 500 ns; enables fast response in overvoltage clamp and transient detection circuits |
| Reference Input Current | ≤2.5 µA typical at 25°C; reduces divider power loss and improves high-impedance sensing accuracy |
Pinout & Package
TSSOP-8 package (4.40 mm × 3.00 mm), moisture-sensitive level 1, Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output / voltage sense node | Main regulated output path; sinks current to ANODE when REF voltage exceeds threshold |
| ANODE (Pin 2, 3, 6, 7) | Common return / ground reference | Internally connected pins; must be tied to system ground or lowest potential node |
| REF (Pin 8) | Reference input / feedback node | Senses voltage divider midpoint; device regulates to maintain 2.5V between REF and ANODE |
| NC (Pins 4, 5) | No internal connection | Not bonded; must remain unconnected per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature qualification | Rated for –40°C to +125°C operation per AEC-Q100 stress test alignment |
| Low-output-impedance regulation | 0.2Ω typical output impedance enables stable regulation even with 100mA load transients |
| Zener diode replacement capability | Adjustable 2.5V–36V output replaces discrete Zener + transistor combos with higher precision and lower drift |
| Internal compensation | Stable without external capacitor between CATHODE and ANODE-reduces BOM count and layout complexity |
| Fast comparator mode | 500ns propagation delay allows use as a high-speed voltage monitor with integrated 2.5V reference |
Applications
| Automotive Flyback SMPS Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated DC/DC converters for engine control units and ADAS modules. IC Role / Device Role / Timing Role: Shunt regulator providing feedback signal to optocoupler-driven primary controller. Use Value: Enables ±1% output regulation across temperature and line variations without trimming, meeting ASIL-B functional safety margins. |
Use Scenario: Precision voltage clamping in battery management system overvoltage protection circuits. IC Role / Device Role / Timing Role: Adjustable shunt reference replacing fixed-voltage Zener diodes with tighter tolerance and lower tempco. Use Value: Reduces component count by eliminating series transistor and base-resistor network while improving long-term stability. |
| Voltage Monitoring & Supervision | Programmable Error Amplifier |
Use Scenario: Real-time rail voltage monitoring in 12V/48V dual-battery automotive systems. IC Role / Device Role / Timing Role: Comparator with integrated 2.5V reference detecting undervoltage/overvoltage thresholds. Use Value: Eliminates need for external reference IC; 500ns response supports fast fault shutdown in ISO 16750-2 pulse testing. |
Use Scenario: Feedback error amplification in digitally controlled buck converters with analog voltage loop. IC Role / Device Role / Timing Role: High-gain transconductance amplifier comparing sensed output to programmable reference. Use Value: Provides >100dB open-loop gain and 0.2Ω output impedance to drive optocoupler LED with minimal gain error. |
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 pinout and electrical specs but narrower temp range | Not qualified for automotive under-hood use; suitable for consumer/industrial power supplies | Select when cost sensitivity outweighs extended temperature requirement and AEC-Q100 compliance is not mandated |
| TL1431QDBVR | Same automotive qualification, but in SOIC-8 (D package) instead of TSSOP-8 (PW) | Larger footprint (3.90 × 4.90 mm vs. 4.40 × 3.00 mm); slightly higher RθJA (114.7°C/W vs. 172.4°C/W) | Choose for legacy board compatibility or where thermal margin permits larger package; identical function and spec |
Compared with TL1431QPWRG4, TL431CDBVR lacks automotive temperature rating and fails AEC-Q100 stress tests, while TL1431QDBVR offers identical performance in a thermally less efficient but mechanically compatible SOIC package-making TL1431QPWRG4 optimal for space-constrained, high-reliability automotive designs.
Availability
TL1431QPWRG4 is available at Aetrix Electronics and suitable for automotive power conversion, battery supervision, and industrial voltage monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL1431QPWRG4 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 TL1431 family was designed as a precision programmable shunt reference targeting automotive, industrial, and telecom power systems requiring high accuracy, wide temperature operation, and Zener-replacement flexibility.
FAQ
What is the maximum cathode voltage supported by TL1431QPWRG4?
The TL1431QPWRG4 supports a maximum cathode-to-anode voltage of 36 V under recommended operating conditions. Absolute maximum rating is 37 V, but sustained operation above 36 V risks exceeding thermal limits or degrading long-term reliability. This 36 V ceiling defines its usable range for adjustable regulation in 24V and 48V automotive systems.
Does TL1431QPWRG4 require an external capacitor for stability?
No, TL1431QPWRG4 is internally compensated and remains stable without any external capacitor between CATHODE and ANODE. However, if downstream circuitry presents capacitive loading-or if improved transient response is needed-a small ceramic capacitor (e.g., 1 nF) may be added, provided it falls within the stability boundary defined in Figure 5-12 of the TL1431QPWRG4 datasheet.
How does TL1431QPWRG4 differ from standard TL431 devices?
TL1431QPWRG4 is the automotive-qualified version of the TL431 architecture, featuring full –40°C to +125°C operation, AEC-Q100 alignment, and tighter initial tolerance (0.4% vs. 1% for standard TL431). It shares identical pinout, electrical behavior, and functional block diagram with TL431 but undergoes additional screening and characterization for automotive reliability.
Can TL1431QPWRG4 be used as a standalone voltage comparator?
Yes, TL1431QPWRG4 can operate in open-loop mode as a comparator with integrated 2.5V reference. When configured this way-applying input voltage to REF and holding ANODE at ground-it delivers 500ns propagation delay and rail-to-rail output swing at the CATHODE pin, enabling fast overvoltage detection without external reference components.
What is the minimum cathode current required for regulation in TL1431QPWRG4?
The TL1431QPWRG4 requires a minimum cathode current of 0.45 mA (typical) to 1 mA (max) at 25°C to maintain regulation. Below this threshold, the internal amplifier exits linear region and regulation collapses. Designers must ensure external biasing (e.g., via RSUP) delivers ≥1 mA under worst-case conditions including low temperature and high output voltage.
TL1431QPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TL1431QPWRG4 FAQ
1.How can I place an order for TL1431QPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1431QPWRG4 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 TL1431QPWRG4 reliable?
The price and inventory of TL1431QPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1431QPWRG4 is usually 5 days.
3.What payment methods are accepted for TL1431QPWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1431QPWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1431QPWRG4?
TL1431QPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1431QPWRG4 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 TL1431QPWRG4?
For technical support, including TL1431QPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1431QPWRG4 requirements.
6.How does Aetrix verify that TL1431QPWRG4 is sourced from the original manufacturer or authorized distributors?
All TL1431QPWRG4 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 TL1431QPWRG4 meets industry standards.
7.What is the process for return or replacement of TL1431QPWRG4?
All TL1431QPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL1431QPWRG4, 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 TL1431QPWRG4 part is unused and in its original packaging.
Return procedure for TL1431QPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1431QPWRG4 Tags
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TL431AIDBZR
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TL431BQDBZR
Texas Instruments
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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
Diodes Incorporated
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