The AZ431BN-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator integrating a precision voltage reference and error amplifier. It provides a typical reference voltage of 2.500V with ±0.8% initial accuracy, corresponding to a specified reference-voltage range of 2.480V to 2.520V.
Using two external resistors, the regulated voltage can be programmed from approximately 2.5V to 36V. Its recommended cathode-current range is 1mA to 100mA, while the absolute maximum cathode-voltage rating is 40V.
The device has a typical minimum regulation current of 0.4mA, with a specified maximum of 1mA. Typical dynamic impedance is 0.15Ω, with a maximum value of 0.5Ω. Typical reference-input current is 0.7μA, with a specified maximum of 4μA.
AZ431BN-ATRE1 supports an operating ambient-temperature range from −40°C to +125°C. Reference-voltage deviation over the full temperature range is typically 4.5mV and specified at up to 16mV. Maximum rated power dissipation for the SOT-23 package is 370mW.
The component is supplied in a three-pin SOT-23 surface-mount package. Pin 1 is REF, pin 2 is the cathode, and pin 3 is the anode. It uses lead-free tape-and-reel packaging, carries the EA2 marking code, and is packed in quantities of 3,000 units per reel.
The official datasheet classifies AZ431BN-ATRE1 as NRND—Not Recommended for New Design. The recommended Green-package replacement is AZ431BN-ATRG1.
Key Specifications
- Manufacturer: Diodes Incorporated
- Manufacturer Part Number: AZ431BN-ATRE1
- Device Type: Adjustable Precision Shunt Regulator
- Typical Reference Voltage: 2.500V
- Reference-Voltage Range: 2.480V to 2.520V
- Initial Accuracy: ±0.8%
- Programmable Voltage Range: Approximately 2.5V to 36V
- Recommended Cathode Current: 1mA to 100mA
- Absolute Maximum Cathode Voltage: 40V
- Typical Minimum Regulation Current: 0.4mA
- Maximum Minimum Regulation Current: 1mA
- Typical Dynamic Impedance: 0.15Ω
- Maximum Dynamic Impedance: 0.5Ω
- Typical Reference-Input Current: 0.7μA
- Maximum Reference-Input Current: 4μA
- Typical Off-State Cathode Current: 0.05μA
- Maximum Off-State Cathode Current: 1μA
- Operating Ambient Temperature: −40°C to +125°C
- Maximum Junction Temperature: +150°C
- Maximum Power Dissipation: 370mW
- Junction-to-Ambient Thermal Resistance: 380°C/W
- Package: SOT-23
- Number of Pins: 3
- Device Marking: EA2
- Mounting Type: Surface Mount
- Packaging: Tape and Reel
- Standard Reel Quantity: 3,000 Units
- Compliance: Lead-Free and RoHS Compliant
- Product Status: NRND
- Recommended Replacement: AZ431BN-ATRG1
Typical Applications
Suitable for switching-power-supply feedback, chargers, power adapters, precision voltage references, adjustable regulators, current sources, current-limit circuits, and graphics-card power systems. Cathode current, resistor tolerance, capacitive-load stability, and power dissipation should be evaluated in the final design.
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