ADP7142ARDZ-3.3-R7

Overview

The ADP7142ARDZ-3.3-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc., providing a fixed 3.3 V output with a maximum current of 200 mA. It operates from an input voltage range of 2.7 V to 40 V and features ultralow output noise of 11 µV rms. The device offers high power supply rejection ratios, achieving 88 dB at 10 kHz, 68 dB at 100 kHz, and 50 dB at 1 MHz. Quiescent current is typically 50 µA with no load, dropping to 1.8 µA in shutdown mode. Initial accuracy is ±0.8%, expanding to ±1.8% over the full temperature range. It includes programmable precision enable and soft start capabilities.

Feature Summary

• Ultralow output noise of 11 µV rms independent of fixed output voltage
• High power supply rejection ratio reaching 88 dB at 10 kHz
• User-programmable soft start via external capacitor for controlled startup
• Precision enable pin with adjustable logic thresholds and hysteresis

Applications

• Regulation for noise-sensitive analog and mixed-signal circuits
• Powering ADC, DAC circuits, and precision amplifiers
• VCO VTUNE control power supplies
• Communications and infrastructure equipment
• Medical, healthcare, industrial, and automotive instrumentation

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing. Confirm the ARDZ designation corresponds to the SOIC-8 package variant. Ensure compatibility with X5R or X7R ceramic capacitors meeting minimum capacitance requirements. Check for AEC-Q100 qualification if automotive grade is required. Validate that the fixed 3.3 V option matches the target circuit design before procurement.

Selection Notes

Select this component for applications requiring high input voltages up to 40 V with minimal output noise. The fixed 3.3 V output eliminates the need for external feedback resistors unless voltage adjustment is desired. Consider the SOIC-8 package for thermal performance and ease of integration. Evaluate the soft start feature to manage inrush currents during system initialization. Ensure the load current does not exceed the 200 mA maximum rating under all operating conditions.

Part Context

The ADP7142 series comprises low noise, CMOS LDO regulators designed for high-performance analog circuits. Available in multiple packages including LFCSP, SOIC, and TSOT, the family supports various fixed output voltages and adjustable configurations. The ADP7142ARDZ-3.3-R7 specifically utilizes the SOIC-8 package with a 3.3 V fixed output. This part belongs to a broader portfolio aimed at portable and battery-powered equipment requiring efficient power management.

Replacement Considerations

Direct replacements within the same family include other ADP7142 variants with different output voltages or packages. Verify pinout compatibility when substituting with different package options like LFCSP or TSOT. Cross-reference specifications such as quiescent current and PSRR to ensure equivalent performance in the target application.