CAT5121TBI-10GT3

Digital Potentiometers Overview

The CAT5121TBI-10GT3 is a 16-tap digital potentiometer manufactured by ON Semiconductor (formerly Catalyst Semiconductor). It features a linear taper and operates via a 2-wire up/down serial interface. The device provides a resistance value of 10 kΩ with a single function unit housed in a space-saving SOT-23-6 package. It supports single-supply operation from 2.7 V to 5.5 V, consumes ultra-low supply current of 0.3 µA, and includes glitchless switching between resistor taps. The component ensures power-on reset to midscale and functions as a mechanical potentiometer replacement.

Digital Potentiometers Feature Summary

• 16-tap linear-taper digital potentiometer with 10 kΩ nominal resistance
• 2-wire up/down serial interface for digital control
• Ultra-low supply current of 0.3 µA with single-supply operation (2.7 V to 5.5 V)
• Glitchless switching between resistor taps and power-on reset to midscale

Digital Potentiometers Applications

• LCD screen adjustment
• Volume control
• Mechanical potentiometer replacement
• Gain adjustment
• Line impedance matching

Digital Potentiometers Procurement Notes

Verify the manufacturer designation, as ON Semiconductor acquired Catalyst Semiconductor. Confirm the specific suffix 'GT3' corresponds to the tape and reel packaging format. Ensure the 10 kΩ resistance value matches the design requirements, as other values like 50 kΩ are available in the same family. Check for RoHS compliance status depending on production date.

Digital Potentiometers Selection Notes

Select this component when a 16-position resolution is sufficient for the application. The 10 kΩ resistance value is suitable for moderate impedance circuits. The SOT-23-6 package is ideal for space-constrained designs. Consider the volatile memory type, which requires state retention logic if power loss occurs. The 2-wire interface simplifies PCB routing compared to I2C or SPI alternatives.

Digital Potentiometers Part Context

This part belongs to the CAT512x series of MiniPot digitally programmable potentiometers. The CAT5121 variant is specifically configured as a variable resistor (rheostat) within the potentiometer family, distinct from the CAT5120 (potentiometer) and CAT5122 (variable resistor) configurations. The series shares common interface protocols and low-power characteristics across different tap counts and resistance values.

Digital Potentiometers Replacement Considerations

Direct replacements include CAT5120TBI-10-T (potentiometer configuration) and CAT5122TBI-10-T (variable resistor configuration) from ON Semiconductor. Cross-manufacturer equivalents should be verified for pin compatibility and interface protocol support.