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Texas Instruments ATL432LIAIDBZR
- Part No.:
- ATL432LIAIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL432LIAIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
ATL432LIAIDBZR from Texas Instruments is a three-terminal adjustable shunt voltage regulator with 1% initial reference voltage tolerance at 25°C, 2.5 V nominal reference voltage, 0.3 Ω typical dynamic impedance, and operation across −40°C to +125°C (Q-temp grade). It serves as a precision voltage reference and error amplifier in secondary-side regulation of isolated flyback converters.
For engineers reviewing the ATL432LIAIDBZR datasheet, ATL432LIAIDBZR pinout, ATL432LIAIDBZR application, or ATL432LIAIDBZR equivalent, key selection considerations include cathode current range (0.08–15 mA), reference input current ≤0.4 µA, temperature drift ≤27 mV over −40°C to +125°C, and SOT-23-3 package compatibility with TL432LI-based designs requiring lower minimum operating current.
Technical Context
The ATL432LIAIDBZR implements an internal bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its functional architecture enables precise closed-loop voltage regulation via external resistive feedback between cathode and reference pins, or open-loop comparator operation with integrated reference.
Unlike standard Zener diodes, it delivers sharp turn-on characteristics and stable regulation down to 0.08 mA cathode current, supporting low-power secondary-side control in isolated power supplies. The device is characterized for automotive-grade temperature operation (−40°C to +125°C) and features 0.3 Ω dynamic impedance for minimal output voltage variation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Cathode Voltage Range | 2.5 V to 36 V - supports wide-output adjustable shunt regulation without external op-amp |
| Dynamic Impedance | 0.3 Ω typical - ensures <1 mV output shift per 1 mA cathode current change |
| Min Cathode Current | 0.08 mA max - enables stable regulation in ultra-low-power auxiliary supplies |
| Ref Input Current | 0.4 µA max - minimizes resistor-divider loading error in precision feedback paths |
| Temp Drift (Q Grade) | 27 mV max over −40°C to +125°C - guarantees ≤±1.08% total reference error across full automotive range |
| Output Sink Current | 15 mA max - drives optocoupler LEDs or small-signal loads directly |
Pinout & Package
ATL432LIAIDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained PCB layouts and compatible with standard SOT-23 pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt current output / voltage sense node | Primary connection point for feedback network and load current sinking; voltage at this pin is regulated relative to ANODE |
| REF | Reference input / threshold sensing | High-impedance input comparing external voltage to internal 2.5 V reference; requires ≤0.4 µA bias current |
| ANODE | Common return / ground reference | System ground reference for both reference and cathode circuits; must be low-impedance for stability |
Key Features
| Feature | Design Value |
|---|---|
| Low quiescent current | 0.08 mA minimum cathode current enables regulation in standby power supplies below 100 µW |
| Automotive temperature grade | −40°C to +125°C operation qualified per AEC-Q100 - suitable for engine control and body electronics |
| Stable without output capacitor | Internally compensated design eliminates need for external cathode-to-anode capacitor in most applications |
| Zener diode replacement | Sharp turn-on and 0.3 Ω impedance provide superior regulation accuracy vs. discrete Zeners in voltage monitoring |
| PIN-to-PIN alternative to TL432LI | Same DBZ footprint and function but with reduced Imin - allows direct drop-in upgrade in legacy TL432LI designs |
Applications
| Secondary-Side Regulation (Flyback SMPS) | Voltage Monitoring & Undervoltage Lockout |
|---|---|
Use Scenario: Regulating output voltage in isolated 5–24 V flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise error signal to optocoupler LED, enabling tight output regulation (<±1.5%) across line/load/temperature. Use Value: Replaces TL432LI with 20% lower minimum cathode current, reducing auxiliary winding losses and improving light-load efficiency. | Use Scenario: Detecting battery voltage drop below 10.5 V in automotive ECUs to trigger safe shutdown. IC Role / Device Role / Timing Role: Precision comparator with integrated 2.5 V reference, comparing scaled battery voltage against threshold. Use Value: 1% reference tolerance and 27 mV temp drift ensure reliable trip point accuracy across −40°C to +125°C without calibration. |
| Precision Constant Current Sink | Adjustable Shunt Voltage Reference |
Use Scenario: Delivering stable 10 mA LED bias current in industrial status indicators with 5–36 V supply range. IC Role / Device Role / Timing Role: Two-resistor configured shunt regulator acting as programmable current sink by fixing voltage across sense resistor. Use Value: 0.3 Ω dynamic impedance maintains current accuracy within ±0.3% despite supply ripple up to 100 mVpp. | Use Scenario: Generating 5.0 V, 12.0 V, or 15.0 V reference voltages for ADCs or analog front-ends in test equipment. IC Role / Device Role / Timing Role: Programmable shunt reference setting precise DC voltage via R1/R2 divider from cathode to REF. Use Value: 2.5 V base reference with 1% tolerance and low temp drift enables <0.5% total system reference error without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432LIBIDBZR | Same 1% reference tolerance and SOT-23-3 package, but higher 0.1 mA min cathode current | Requires larger auxiliary winding or higher bias resistor values in flyback designs | Select TL432LIBIDBZR only if ATL432LIAIDBZR is unavailable; expect ~15% higher light-load power loss |
| ATL431LIAIDBZR | Identical electrical specs and Q-temp rating, but different pinout (REF/ANODE/CATHODE vs CATHODE/REF/ANODE) | Not pin-compatible; requires PCB layout revision and netlist update | Choose ATL431LIAIDBZR only for new designs where pinout flexibility is acceptable and board space permits X2SON alternatives |
Compared with TL432LIBIDBZR, ATL432LIAIDBZR reduces minimum operating current by 20%, directly lowering no-load power in isolated supplies; versus ATL431LIAIDBZR, it offers identical performance with DBZ pinout compatibility-enabling drop-in replacement in TL432LI layouts without redesign.
Availability
ATL432LIAIDBZR is available at Aetrix Electronics and suitable for automotive power management, industrial flyback converters, and precision voltage monitoring requiring stable component supply and AEC-Q100-compliant performance.
Supply support for ATL432LIAIDBZR 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, with leadership in power management, signal chain, and high-reliability components.
The ATL43xLI family was designed specifically for precision shunt regulation in automotive and industrial isolated power supplies, emphasizing low IQ, wide temperature operation, and Zener-replacement capability.
FAQ
What is the maximum cathode voltage rating for ATL432LIAIDBZR?
The ATL432LIAIDBZR has an absolute maximum cathode-to-anode voltage (VKA) rating of 37 V. Its recommended operating range extends from VREF (2.5 V) up to 36 V, making it suitable for 24 V and 36 V industrial bus applications. Exceeding 37 V risks permanent damage, and operation above 36 V falls outside guaranteed specifications.
Does ATL432LIAIDBZR require an external capacitor for stability?
No, ATL432LIAIDBZR is internally compensated and remains stable without an external cathode-to-anode capacitor in most configurations. However, when driving capacitive loads >100 pF or operating near instability boundaries (e.g., low IKA <1 mA with large CL), consult Figure 13 in the SLVSDU6D datasheet to select an appropriate load capacitor that maintains phase margin.
How does the pinout of ATL432LIAIDBZR differ from ATL431LIAIDBZR?
ATL432LIAIDBZR uses a CATHODE/REF/ANODE pinout (Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE) in the SOT-23-3 (DBZ) package, whereas ATL431LIAIDBZR uses REF/ANODE/CATHODE (Pin 1=REF, Pin 2=ANODE, Pin 3=CATHODE). This difference prevents direct PCB substitution without layout modification, though both share identical electrical behavior and Q-temp qualification.
Can ATL432LIAIDBZR replace TL432LI in existing designs?
Yes, ATL432LIAIDBZR is explicitly specified as a pin-to-pin alternative to TL432LI in the DBZ package, with identical pinout, footprint, and functionality. Its lower 0.08 mA minimum cathode current improves light-load efficiency, and all electrical parameters meet or exceed TL432LI specifications-making it a validated drop-in upgrade for automotive and industrial systems.
What is the thermal performance of ATL432LIAIDBZR in SOT-23-3 package?
In the SOT-23-3 (DBZ) package, ATL432LIAIDBZR has a junction-to-ambient thermal resistance (RθJA) of 371.7°C/W. At 15 mA cathode current and 36 V VKA, worst-case power dissipation is ~540 mW, limiting maximum ambient temperature to ~85°C without heatsinking. For high-power use, thermal vias to inner ground planes are recommended to leverage RθJB = 104.7°C/W.
ATL432LIAIDBZR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ATL432LIAIDBZR FAQ
1.How can I place an order for ATL432LIAIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL432LIAIDBZR 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 ATL432LIAIDBZR reliable?
The price and inventory of ATL432LIAIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL432LIAIDBZR is usually 5 days.
3.What payment methods are accepted for ATL432LIAIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATL432LIAIDBZR transactions.
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4.How is shipping managed for ATL432LIAIDBZR?
ATL432LIAIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATL432LIAIDBZR 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 ATL432LIAIDBZR?
For technical support, including ATL432LIAIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL432LIAIDBZR requirements.
6.How does Aetrix verify that ATL432LIAIDBZR is sourced from the original manufacturer or authorized distributors?
All ATL432LIAIDBZR 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 ATL432LIAIDBZR meets industry standards.
7.What is the process for return or replacement of ATL432LIAIDBZR?
All ATL432LIAIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with ATL432LIAIDBZR, 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 ATL432LIAIDBZR part is unused and in its original packaging.
Return procedure for ATL432LIAIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL432LIAIDBZR Tags
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TL431AIDBZR
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