CAT5122SDI-10GT3

Digital Potentiometers Overview

The CAT5122SDI-10GT3 is a single-channel, linear-taper digital potentiometer IC from onsemi. It functions as a variable resistor with 16 programmable tap positions controlled via a 2-wire up/down serial interface. The device features a nominal end-to-end resistance of 10 kΩ and operates on a single supply voltage ranging from 2.7 V to 5.5 V. It includes power-on reset circuitry that initializes the wiper to midscale upon startup. The component is housed in a space-saving 5-pin SC-70 package (CASE 419AC) and supports glitchless switching between resistor taps.

Digital Potentiometers Feature Summary

• 16-tap resolution with linear taper characteristics
• 2-wire Up/Down serial interface for wiper control
• Single-supply operation: 2.7 V to 5.5 V
• Ultra-low standby current: typical 0.3 µA at 5 V
• Power-on reset to midscale position

Digital Potentiometers Applications

• Mechanical potentiometer replacement
• Gain adjustment in amplifier circuits
• LCD screen contrast or bias adjustment
• Line impedance matching

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix 'SDI' corresponds to the SC-70-5 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure design margins account for the absolute maximum ratings, particularly regarding latch-up immunity and continuous current limits into the H, L, and W terminals.

Digital Potentiometers Selection Notes

Select this part over the CAT5120 if a variable resistor configuration is required rather than a potentiometer. The CAT5122 connects the wiper and high terminal internally, whereas the CAT5120 connects the low terminal to ground. Verify that the 10 kΩ resistance value meets the application's impedance requirements, as a 50 kΩ variant is also available in the same family.

Digital Potentiometers Part Context

This component belongs to the CAT5120/CAT5121/CAT5122 family of 16-tap digital potentiometers. While the CAT5120 acts as a potentiometer and the CAT5121 as a variable resistor with different internal pin connections, the CAT5122 provides a specific variable resistor topology suitable for gain control applications where the wiper and high side are tied together.

Digital Potentiometers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.