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Texas Instruments ATL432LIAQDBZR
- Part No.:
- ATL432LIAQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL432LIAQDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
ATL432LIAQDBZR from Texas Instruments is a three-terminal adjustable shunt regulator with 1% initial reference voltage tolerance at 25°C, 2.5 V minimum output voltage, and operation across −40°C to +125°C. It sinks cathode current up to 15 mA, features 0.3 Ω typical dynamic impedance, and replaces Zener diodes in secondary-side regulation of flyback SMPS.
For engineers reviewing the ATL432LIAQDBZR datasheet, ATL432LIAQDBZR pinout, ATL432LIAQDBZR application, or ATL432LIAQDBZR equivalent, key selection criteria include its Q-temp automotive qualification, low 0.4 µA max reference input current, sharp turn-on characteristic, and SOT-23-3 package compatibility with TL432LI while offering lower minimum operating current.
Technical Context
The ATL432LIAQDBZR implements an internal precision voltage reference (2.5 V ±1%) and high-gain error amplifier driving a Darlington sink output stage. Its functional architecture enables closed-loop voltage regulation via external resistive feedback between cathode and reference pins, or open-loop comparator operation with integrated reference.
It operates as a programmable shunt regulator over 2.5 V to 36 V output range using two external resistors, with thermal stability characterized for automotive temperature range (−40°C to +125°C) and maximum 27 mV reference voltage drift over that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Tolerance | ±1% at 25°C (A grade), enabling precise voltage setting in feedback networks |
| Output Voltage Range | 2.5 V to 36 V (adjustable via external resistors), supporting wide-range power supply designs |
| Operating Temperature | −40°C to +125°C (Q-temp), qualified for under-hood automotive and industrial environments |
| Dynamic Impedance | 0.3 Ω typical, ensuring stable regulation under load transients without external capacitor |
| Reference Input Current | 0.4 µA max, minimizing bias current error in high-impedance feedback dividers |
| Min Cathode Current | 0.08 mA max for regulation, allowing ultra-low-power operation in battery-backed systems |
| Cathode Current Capability | 15 mA max sink current, sufficient for driving optocoupler LEDs in isolated SMPS feedback loops |
Pinout & Package
ATL432LIAQDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, with exposed thermal pad for enhanced thermal performance in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt Current/Voltage Input | Main current path into device; connects to regulated node or optocoupler anode in SMPS feedback |
| REF | Threshold Reference Input | Senses divided output voltage; must receive ≥0.4 µA to maintain amplifier bias and regulation |
| ANODE | Common Return Node | Typically connected to system ground or return path; serves as reference point for all voltages |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Operation | Rated for −40°C to +125°C ambient, meeting AEC-Q100 stress test requirements for automotive electronics |
| Low Reference Input Current | 0.4 µA max ensures minimal loading on high-resistance feedback networks, preserving accuracy |
| Sharp Turn-On Characteristic | Active output circuitry delivers fast response and clean switching behavior, critical for comparator-mode undervoltage detection |
| Internal Compensation | Stable without external cathode-to-anode capacitor, simplifying layout and reducing BOM count |
| Zener Diode Replacement | Programmable 2.5–36 V output with superior temperature stability and lower minimum current than discrete Zeners |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated flyback converter where primary-side controller receives feedback via optocoupler. IC Role / Device Role / Timing Role: Shunt regulator on secondary side, sinking current through optocoupler LED to modulate primary-side duty cycle. Use Value: Enables precise output voltage regulation independent of transformer turns ratio, with 1% initial tolerance and <27 mV tempco over −40°C to +125°C. | Use Scenario: On-board voltage clamping or reference generation in space-constrained industrial control modules. IC Role / Device Role / Timing Role: Adjustable shunt element replacing fixed-voltage Zener diodes with higher accuracy and thermal stability. Use Value: Reduces component count by eliminating need for multiple Zener values; supports 2.5–36 V programming with 0.3 Ω dynamic impedance for tight regulation. |
| Voltage Monitoring | Precision Constant Current Sink |
Use Scenario: Undervoltage lockout (UVLO) or overvoltage protection (OVP) circuit in automotive body control module. IC Role / Device Role / Timing Role: Comparator with integrated 2.5 V reference, comparing monitored rail to threshold set by resistor divider. Use Value: Eliminates external reference IC; 0.4 µA IREF enables high-impedance sensing with minimal power draw and fast response due to sharp turn-on. | Use Scenario: LED biasing or sensor excitation current source in automotive cabin sensors. IC Role / Device Role / Timing Role: Precision current sink configured with single resistor from cathode to supply, referenced to internal 2.5 V bandgap. Use Value: Delivers stable current independent of supply variation (up to 36 V), with <1% initial error and <27 mV drift over full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432LIQDBZR | Same pinout and electrical specs, but higher 1.5 µA max reference current and 0.5% initial tolerance (B grade) | Better accuracy for precision references; higher IREF increases divider error in high-Z networks | Select TL432LIQDBZR when ±0.5% initial tolerance is required and reference current loading is acceptable |
| ATL431LIAQDBZR | Identical functionality and specs, but different DBZ pinout: REF and ANODE swapped vs ATL432LIAQDBZR | Requires PCB layout revision; not pin-compatible despite same package and function | Select ATL431LIAQDBZR only if redesigning board layout to match its REF/ANODE pin assignment |
Compared with TL432LIQDBZR, ATL432LIAQDBZR trades 0.5% accuracy for lower 0.4 µA reference current-critical for high-impedance feedback-and compared with ATL431LIAQDBZR, it offers identical performance with a pinout optimized for legacy TL432LI layouts, avoiding redesign.
Availability
ATL432LIAQDBZR is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS feedback, and precision voltage monitoring requiring stable component supply across extended temperature ranges.
Supply support for ATL432LIAQDBZR 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 industrial, automotive, and communications markets.
The ATL43xLI product line was designed specifically for high-stability, low-quiescent-current shunt regulation in automotive and industrial power systems, emphasizing thermal robustness and Zener replacement capability.
FAQ
What is the reference voltage tolerance of ATL432LIAQDBZR at 25°C?
The ATL432LIAQDBZR has a reference voltage tolerance of ±1% at 25°C, corresponding to its "A" grade designation. This means the internal 2.5 V reference falls within 2.475 V to 2.525 V at room temperature, directly impacting the accuracy of any voltage or current setpoint derived from it in feedback configurations.
Does ATL432LIAQDBZR require an external capacitor for stability?
No, ATL432LIAQDBZR is internally compensated and does not require an external capacitor between cathode and anode for basic stability. However, when used with capacitive loads or in high-frequency feedback loops (e.g., optocoupler-based SMPS), stability boundary charts in the datasheet must be consulted to select appropriate load capacitance and series resistance to avoid oscillation.
What is the maximum cathode current rating for ATL432LIAQDBZR?
The ATL432LIAQDBZR supports a maximum continuous cathode current of 15 mA, as specified in its absolute maximum ratings. This current capacity enables direct driving of standard optocoupler LEDs in isolated power supply feedback paths and supports precision constant-current sink applications up to this limit.
How does the pinout of ATL432LIAQDBZR differ from ATL431LIAQDBZR?
ATL432LIAQDBZR uses a DBZ (SOT-23-3) pinout where Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. In contrast, ATL431LIAQDBZR has Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - meaning REF and ANODE are swapped. This makes them functionally identical but not pin-compatible; board layout changes are required for substitution.
Is ATL432LIAQDBZR qualified for automotive applications?
Yes, ATL432LIAQDBZR carries the "Q" suffix indicating qualification for automotive temperature range (−40°C to +125°C) and is characterized per AEC-Q100 requirements. Its 27 mV maximum reference voltage drift over this range and robust ESD ratings (±2000 V HBM) confirm suitability for under-hood and body electronics applications.
ATL432LIAQDBZR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ATL432LIAQDBZR FAQ
1.How can I place an order for ATL432LIAQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL432LIAQDBZR 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 ATL432LIAQDBZR reliable?
The price and inventory of ATL432LIAQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL432LIAQDBZR is usually 5 days.
3.What payment methods are accepted for ATL432LIAQDBZR?
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4.How is shipping managed for ATL432LIAQDBZR?
ATL432LIAQDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATL432LIAQDBZR 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 ATL432LIAQDBZR?
For technical support, including ATL432LIAQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL432LIAQDBZR requirements.
6.How does Aetrix verify that ATL432LIAQDBZR is sourced from the original manufacturer or authorized distributors?
All ATL432LIAQDBZR 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 ATL432LIAQDBZR meets industry standards.
7.What is the process for return or replacement of ATL432LIAQDBZR?
All ATL432LIAQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with ATL432LIAQDBZR, 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 ATL432LIAQDBZR part is unused and in its original packaging.
Return procedure for ATL432LIAQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL432LIAQDBZR Tags
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TL431AIDBZR
Texas Instruments
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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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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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