X9C303S8

Overview

The X9C303S8 is a single-channel logarithmic Digitally Controlled Potentiometer (XDCP) manufactured by Renesas Electronics. It features a 32 kΩ end-to-end resistance with 100 wiper tap points and a log taper characteristic. The device utilizes a three-wire serial interface (CS, U/D, INC) for control and includes nonvolatile memory to retain the wiper position upon power-up. Operating at a supply voltage of ±5V, it draws a maximum active current of 3 mA and standby current of 750 µA. The unit is housed in an 8-lead SOIC package.

Feature Summary

• Logarithmic taper with 100 wiper taps and 32 kΩ total resistance
• Nonvolatile memory stores wiper position for recall on power-up
• Three-wire serial interface (CS, U/D, INC) for digital control
• Low power CMOS technology with 3 mA max active current

Applications

• Audio volume and tone control circuits
• Gain adjustment in operational amplifier stages
• Parameter tuning in portable battery-operated devices

Procurement Notes

Verify component status as the X9C303 series is generally listed as obsolete or discontinued by major distributors. Confirm availability through authorized Renesas channels or secondary markets. Ensure the specific S8 suffix corresponds to the required 8-lead SOIC package variant. Check RoHS compliance documentation if environmental standards are mandatory for the target assembly.

Selection Notes

Select this component when a logarithmic response curve is required for audio or sensor applications. The 32 kΩ resistance value suits moderate impedance circuits. Verify that the ±5V terminal voltage rating aligns with the system supply rails. The nonvolatile feature eliminates the need for initial calibration routines after power cycles.

Part Context

The X9C303 belongs to the X9C30x family of digitally controlled potentiometers from Intersil/Renesas. It shares architectural similarities with linear variants like the X9C302 but differs in its resistive element taper. The S8 suffix specifically denotes the surface-mount 8-lead Small Outline Integrated Circuit (SOIC) package format.

Replacement Considerations

Direct pin-compatible replacements include the CAT5116 from ON Semiconductor or Catalyst Semiconductor, which offers similar 100-tap logarithmic characteristics. Other potential substitutes within the Renesas portfolio include the ISL23318 series, though these may offer different tap counts or voltage ranges.