ADR318ARJ-R2

Overview

The ADR318ARJ-R2 is a precision 1.8 V band gap voltage reference manufactured by Analog Devices Inc. It features an initial accuracy of ±5 mV maximum and a low temperature coefficient of 25 ppm/°C maximum over the 0°C to 70°C range. The device operates with a wide supply voltage range from (VOUT + 0.6 V) to 15 V, requiring a minimum headroom of 0.6 V. Quiescent current is 120 μA maximum, reducing to less than 3 μA in shutdown mode. It delivers up to 5 mA output current and utilizes a 5-lead SOT-23 package.

Feature Summary

• Patented temperature drift curvature correction techniques minimize nonlinearity of voltage change with temperature.
• Integrated shutdown function allows power reduction to less than 3 μA when disabled via logic input.
• Separate VOUT(SENSE) and VOUT(FORCE) pins enable full Kelvin operation for improved accuracy on PCBs with thin or long traces.

Applications

• Battery-powered instrumentation
• Portable medical instruments
• Data acquisition systems
• Industrial process control systems

Procurement Notes

Verify the specific ordering suffix R2 corresponds to the reel packaging quantity of 250 units as listed in the official Analog Devices ordering guide. Confirm that the component meets the industrial temperature range specification of 0°C to 70°C. Ensure compatibility with the 5-lead SOT-23 package dimensions for the target PCB layout. Cross-reference the part number against the latest datasheet revision A to confirm electrical characteristics remain unchanged.

Selection Notes

Select this component for applications requiring a stable 1.8 V reference with low power consumption and small footprint. The separate sense and force pins are critical for maintaining accuracy in layouts with significant trace resistance. The shutdown capability makes it suitable for battery-operated devices where standby power must be minimized. Ensure the input voltage stays within the specified operating range relative to the output voltage.

Part Context

The ADR318 is a low dropout voltage (LDV) device designed for high accuracy and stability. It is part of Analog Devices' portfolio of precision voltage references. The ARJ variant specifically denotes the 5-lead SOT-23 package option. The device is optimized for converting higher voltages down to a precise 1.8 V level for sensitive analog circuits.

Replacement Considerations

The ADR318ARJ-REEL and ADR318ARJ-REEL7 are functional equivalents offering different packaging quantities (10,000 and 3,000 units respectively). The ADR318ARJZ-REEL71 is a lead-free version available in the same package type. Verify pinout compatibility before substitution.