ADP7142WAUJZ-3.3-R7

Overview

The ADP7142WAUJZ-3.3-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc., featuring a fixed 3.3 V output and a maximum output current of 200 mA. It operates within an input voltage range of 2.7 V to 40 V and delivers a typical quiescent current of 50 μA with no load. The device provides high power supply rejection ratios of 88 dB at 10 kHz, 68 dB at 100 kHz, and 50 dB at 1 MHz. Output noise is specified at 11 μV rms across the 10 Hz to 100 kHz bandwidth. Initial accuracy is ±0.8% at 25°C, expanding to ±1.8% over the full temperature range from −40°C to +125°C. Dropout voltage is typically 200 mV at a 200 mA load.

Feature Summary

• Provides ultralow output noise of 11 μV rms independent of the fixed output voltage setting.
• Features precision enable logic with programmable thresholds and hysteresis for reliable system control.
• Capable of operating stably with small 2.2 μF ceramic output capacitors to minimize board space.
• Includes user-programmable soft start functionality via an external capacitor to limit inrush current.

Applications

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

Procurement Notes

Verify the specific package type against the datasheet, as the 'W' suffix indicates a TSOT-5 package variant. Confirm that the ordering code matches the exact fixed voltage option required. Ensure compatibility with the intended PCB layout regarding thermal dissipation and minimum capacitance requirements. Cross-reference the revision level with the manufacturer's documentation to confirm feature consistency.

Selection Notes

Select this component when a high input voltage up to 40 V must be regulated down to a stable 3.3 V rail. It is suitable for portable equipment due to its low quiescent current consumption. Consider the TSOT-5 package if space constraints are critical but note that soft start programming is not available in this package type. Ensure the application requires the specific fixed voltage rather than an adjustable configuration.

Part Context

This part belongs to the ADP7142 family of low noise, high input voltage LDO regulators. The series offers multiple fixed output voltages ranging from 1.2 V to 5.0 V, alongside adjustable options. The family supports various packages including LFCSP, SOIC, and TSOT, catering to different thermal and spatial requirements while maintaining consistent electrical performance characteristics.

Replacement Considerations

Direct substitutes include other ADP7142 variants with different fixed output voltages or packages, such as ADP7142AUJZ-3.3-R7 (SOIC) or ADP7142ACPZN-3.3-R7 (LFCSP). Verify pinout compatibility and thermal resistance differences before substitution.