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Texas Instruments ATL431LIAQDBZRQ1
- Part No.:
- ATL431LIAQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL431LIAQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:33,013
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Product details
Overview
ATL431LIAQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) programmable shunt regulator with 0.5% initial reference voltage tolerance at 25°C, 2.5 V nominal VREF, 0.3 Ω typical output impedance, and 80 µA maximum Imin - used as a precision voltage reference or error amplifier in automotive DC/DC converters and on-board chargers.
For engineers reviewing the ATL431LIAQDBZRQ1 datasheet, ATL431LIAQDBZRQ1 pinout, ATL431LIAQDBZRQ1 application, or ATL431LIAQDBZRQ1 equivalent, key selection considerations include its low-IQ shunt regulation capability, automotive-grade thermal stability, SOT-23-3 package compatibility, and functional equivalence to TL431LI-Q1 with reduced minimum operating current.
Technical Context
The ATL431LIAQDBZRQ1 integrates a precision 2.5 V bandgap reference and high-gain op-amp driving a Darlington sink output stage, enabling sharp turn-on behavior and stable operation without external compensation. Its internal architecture supports both open-loop comparator and closed-loop shunt regulation modes.
It operates across –40°C to +125°C with ≤27 mV total reference voltage drift, maintains <0.4 µA max reference input current (IREF), and delivers 15 mA max cathode sink current (IKA) while sustaining <0.75 Ω dynamic impedance (|ZKA|) over 1–15 mA cathode current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 2.500 V ±0.5% (B-grade); enables precise feedback setting for adjustable power supplies |
| Imin (max) | 80 µA; minimum cathode current required to enter regulation - critical for ultra-low-power biasing |
| |ZKA| (typ) | 0.3 Ω; low dynamic impedance ensures stable output voltage under load transients |
| VI(dev) (max) | 27 mV over –40°C to +125°C; guarantees tight reference stability across full automotive temperature range |
| IREF (max) | 0.4 µA; ultra-low reference pin current minimizes resistor-divider error in precision applications |
| VKA Range | 2.5 V to 36 V; supports wide-output-voltage regulation using two external resistors |
| ESD Rating (HBM) | ±4000 V; meets AEC-Q100 stress requirements for robustness in automotive PCB handling |
Pinout & Package
ATL431LIAQDBZRQ1 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained automotive PCBs and compatible with standard pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Output/Sink node | Shunt current path; connects to regulated rail or feedback network; sinks up to 15 mA |
| REF (Pin 2) | Reference input | Senses voltage divider output; requires ≤0.4 µA input current; sets regulation point at 2.5 V |
| ANODE (Pin 3) | Common return | Typically tied to system ground; serves as voltage reference for all internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in safety-critical automotive systems |
| 0.5% VREF accuracy (B grade) | Reduces need for post-production calibration in precision feedback loops |
| 80 µA max Imin | Enables lower standby power in always-on automotive subsystems vs. legacy TL431 variants |
| 0.3 Ω typical output impedance | Minimizes output voltage deviation during fast load steps in switching regulators |
| No external capacitor required | Internally compensated for stability - simplifies layout and eliminates capacitor-related aging/failure risks |
Applications
| DC/DC Converter Feedback | On-Board Charger (OBC) Regulation |
|---|---|
Use Scenario: Precision voltage feedback in isolated flyback or forward converters powering ADAS ECUs. IC Role / Device Role / Timing Role: Adjustable shunt reference providing error signal to optocoupler or controller IC. Use Value: 0.5% VREF tolerance and 27 mV temp drift ensure ±1% output regulation over full automotive temperature range. | Use Scenario: Output voltage regulation in bidirectional OBCs for EV battery charging. IC Role / Device Role / Timing Role: High-stability reference in secondary-side feedback loop controlling synchronous rectifiers. Use Value: Low 80 µA Imin allows reliable startup and light-load regulation without auxiliary winding dependency. |
| LED Lighting Current Sink | Infotainment System Voltage Clamp |
Use Scenario: Constant-current driver for interior ambient lighting with color consistency requirements. IC Role / Device Role / Timing Role: Reference element in BJT-based current sink topology sensing RS voltage drop. Use Value: 0.4 µA max IREF minimizes sense-resistor error contribution, enabling <1% current accuracy with 0.1% RS. | Use Scenario: Overvoltage protection clamp for 5 V logic rails in digital instrument clusters. IC Role / Device Role / Timing Role: Precision Zener replacement clamping supply rail at 5.1 V via resistor divider. Use Value: Sharp turn-on characteristic and 0.3 Ω impedance provide fast response to transient overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIQDBVRQ1 | Same SOT-23-3 package, identical pinout, but 100 µA max Imin and 1% VREF tolerance (A grade) | Higher minimum current increases standby power; looser tolerance reduces closed-loop accuracy | Select when cost sensitivity outweighs precision and ultra-low-IQ requirements |
| ATL432LIAQDBZRQ1 | Identical electrical specs and AEC-Q100 qualification, but reversed REF/CATHODE pinout in DBZ package | Requires PCB layout revision; not pin-compatible despite same footprint | Choose only if redesign accommodates swapped pin 1/2 connections |
Compared with TL431LIQDBVRQ1, ATL431LIAQDBZRQ1 delivers tighter 0.5% reference accuracy and 20 µA lower Imin for improved light-load efficiency; versus ATL432LIAQDBZRQ1, it offers direct pin compatibility with legacy TL431 designs while maintaining identical performance and automotive qualification.
Availability
ATL431LIAQDBZRQ1 is available at Aetrix Electronics and suitable for automotive DC/DC converters, on-board chargers, and LED lighting systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATL431LIAQDBZRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, personal electronics, and communications markets.
The ATL43xLI-Q1 product line was designed specifically for AEC-Q100-compliant automotive power management, emphasizing low-IQ operation, high-accuracy voltage references, and robust thermal performance in harsh environments.
FAQ
What is the reference voltage tolerance of ATL431LIAQDBZRQ1 at 25°C?
The ATL431LIAQDBZRQ1 has a 0.5% initial reference voltage tolerance at 25°C (B-grade specification), meaning its VREF is guaranteed between 2.487 V and 2.512 V under those conditions. This tight tolerance directly improves closed-loop regulation accuracy in automotive power supplies where ATL431LIAQDBZRQ1 serves as the feedback reference element.
Does ATL431LIAQDBZRQ1 require an external output capacitor for stability?
No, ATL431LIAQDBZRQ1 is internally compensated and remains stable without an external capacitor between CATHODE and ANODE - a key advantage over many discrete shunt regulators. This eliminates capacitor-related failure modes and simplifies layout. However, if an output capacitor is added for filtering, Figure 13 in the datasheet must be consulted to avoid oscillation in the intended operating region of ATL431LIAQDBZRQ1.
What is the minimum cathode current needed for ATL431LIAQDBZRQ1 to regulate properly?
The ATL431LIAQDBZRQ1 requires a minimum cathode current (Imin) of no more than 80 µA to enter and maintain regulation. This value is critical for low-power applications such as always-on vehicle networks, where exceeding this threshold ensures sufficient gain for accurate feedback control. Operating below 80 µA may result in degraded regulation and slow response in circuits using ATL431LIAQDBZRQ1.
How does the pinout of ATL431LIAQDBZRQ1 compare to TL431LI-Q1?
ATL431LIAQDBZRQ1 uses the same DBZ (SOT-23-3) package and identical pinout as TL431LI-Q1: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This pin-to-pin compatibility allows direct replacement in existing designs without PCB modification, while delivering improved specifications including lower Imin and tighter VREF tolerance compared to standard TL431LI-Q1 variants.
Can ATL431LIAQDBZRQ1 be used as a comparator?
Yes, ATL431LIAQDBZRQ1 can operate in open-loop mode as a comparator with integrated reference. When configured with proper cathode current (>80 µA), it compares the voltage at the REF pin to its internal 2.5 V reference and drives the CATHODE low when the REF voltage exceeds that threshold. This functionality is leveraged in overvoltage detection and level-sensing applications within automotive systems using ATL431LIAQDBZRQ1.
ATL431LIAQDBZRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ATL431LIAQDBZRQ1 FAQ
1.How can I place an order for ATL431LIAQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL431LIAQDBZRQ1 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 ATL431LIAQDBZRQ1 reliable?
The price and inventory of ATL431LIAQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL431LIAQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for ATL431LIAQDBZRQ1?
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ATL431LIAQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATL431LIAQDBZRQ1 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 ATL431LIAQDBZRQ1?
For technical support, including ATL431LIAQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL431LIAQDBZRQ1 requirements.
6.How does Aetrix verify that ATL431LIAQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All ATL431LIAQDBZRQ1 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 ATL431LIAQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of ATL431LIAQDBZRQ1?
All ATL431LIAQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ATL431LIAQDBZRQ1, 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 ATL431LIAQDBZRQ1 part is unused and in its original packaging.
Return procedure for ATL431LIAQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL431LIAQDBZRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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
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