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X9C503S / X9317WS / X9318WS / X9319WS Digital Potentiometer IC SMD SOIC8 | Digitally Controlled Resistor
X9C503S / X9317WS / X9318WS / X9319WS Digital Potentiometer IC SMD SOIC8 | Digitally Controlled Resistor
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X9C503S / X9317WS / X9318WS / X9319WS Digital Potentiometer IC — SMD SOIC8
Digital potentiometers (digipots) replace mechanical potentiometers with electronically controlled resistance — allowing microcontrollers to adjust gain, volume, bias, and calibration values under software control, without mechanical wear or human intervention. This listing covers four Renesas (formerly Xicor) digital potentiometer ICs in SMD SOIC8 package: X9C503S, X9317WS, X9318WS, and X9319WS — each offering different resistance values and control interfaces for different application requirements.
Model Comparison
| Model | End-to-End Resistance | Steps | Interface | Key Feature |
|---|---|---|---|---|
| X9C503S | 50kΩ | 100 | 3-wire (CS, INC, U/D) | Non-volatile wiper position storage |
| X9317WS | 10kΩ | 100 | 2-wire (CS, INC) | Push-button compatible, NV storage |
| X9318WS | 50kΩ | 100 | 2-wire (CS, INC) | Push-button compatible, NV storage |
| X9319WS | 50kΩ | 100 | 2-wire (CS, INC) | Push-button compatible, NV storage |
Package Specifications
| Package | SOIC8 (8-pin small outline IC, SMD) |
| Mount Type | SMD (surface mount) |
| Condition | New, original |
| Origin | Mainland China |
What Is a Digital Potentiometer?
A digital potentiometer (digipot) is an integrated circuit that emulates a mechanical potentiometer using an array of resistors and electronic switches. The wiper position — and therefore the resistance between the wiper and each end terminal — is controlled by digital signals from a microcontroller. Key advantages over mechanical potentiometers:
- No mechanical wear — no moving parts, unlimited adjustment cycles
- Software control — resistance set by microcontroller, enabling automatic calibration and adaptive systems
- Non-volatile storage — X9C/X93xx series stores wiper position in EEPROM, retaining the setting after power-off
- Precision — 100-step resolution provides fine-grained control
- Compact — SOIC8 package replaces bulky mechanical potentiometers in space-constrained designs
Key Features
- ✅ Non-volatile wiper position — EEPROM stores the last wiper position, retained through power cycles
- ✅ 100-step resolution — fine-grained resistance control for precision applications
- ✅ SOIC8 SMD package — compact footprint for space-constrained PCB designs
- ✅ Simple digital interface — 3-wire (X9C503S) or 2-wire (X9317/18/19WS) control, compatible with any microcontroller
- ✅ Multiple resistance values — 10kΩ (X9317WS) and 50kΩ (X9318WS, X9319WS, X9C503S) options
- ✅ New original parts — genuine Renesas/Xicor ICs, not remarked or counterfeit
Common Applications
- Automatic gain control (AGC) in audio and RF circuits
- Digital volume control in audio amplifiers
- Sensor calibration and offset adjustment
- LCD contrast and brightness control
- Programmable voltage reference adjustment
- Adaptive filter coefficient control
- Motor speed control (PWM duty cycle adjustment)
- Replacing mechanical trimmers in production calibration
Frequently Asked Questions
Q: How do I control the X9C503S with Arduino?
A: The X9C503S uses a 3-wire interface (CS, INC, U/D). Toggle INC while U/D sets direction (up/down) to increment or decrement the wiper position. Arduino libraries for the X9C series are available on GitHub.
Q: Does the wiper position survive power-off?
A: Yes. All models in this listing include non-volatile EEPROM storage. The wiper position is automatically saved and restored on power-up.
Q: Can I use this as a voltage divider?
A: Yes. Connect the two end terminals across a voltage source and use the wiper terminal as the output. The wiper voltage will be proportional to the wiper position (0–100 steps).
Package Contents
- 1× Digital Potentiometer IC in SOIC8 package (model as selected)
