Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | 7-bit volatile digital rheostat |
| Nominal resistance | 50 kΩ |
| Wiper positions | 128 |
| Interface | I²C-compatible |
| Supply range | 1.8 V to 5.5 V |
| Package | SC70-6 |
| Temperature grade | Extended, -40°C to +125°C |
| Family status | In Production |
Product Overview
The MCP4017T-503E/LT is the 50 kΩ extended-temperature variant of Microchip’s MCP4017 volatile I²C digital rheostat. Its 128 wiper positions provide digital adjustment for analog trim and calibration functions while retaining the compact six-lead SC70 package.
The -503 resistance option has a different resistance-per-step and bandwidth behavior from the 5 kΩ and 10 kΩ versions. Design calculations should therefore use the 50 kΩ device data instead of copying settling or bandwidth figures from another MCP4017 resistance code.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Resolution | 7 bit / 128 positions |
| Nominal resistance | 50 kΩ |
| Supply operation | 1.8 V to 5.5 V |
| Analog characteristics supply range | 2.7 V to 5.5 V |
| I²C standard mode | Up to 100 kHz |
| I²C fast mode | Up to 400 kHz at 2.7–5.5 V |
| Typical static current | 2.5 µA with serial interface inactive |
| Memory type | Volatile |
| Power-on behavior | Defined reset/mid-scale behavior per family datasheet |
| Operating temperature | -40°C to +125°C |
| Package | SC70-6 |
Design Considerations
The programmed wiper value is volatile, so a calibrated system must restore its desired code after startup or brownout. This should be part of firmware initialization rather than assumed to persist in the device.
With a 50 kΩ end-to-end element, parasitic capacitance and the load connected to the wiper can limit AC response. Use the datasheet’s device-specific curves and the intended wiper code when estimating bandwidth or settling.
Related Engineering Resources
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The related MCP4017T-103E/LT is a 10 kΩ I²C-controlled rheostat option, rather than this 50 kΩ ordering variant. Review resistance-dependent step sizes and circuit loading before changing the BOM; browse the digital potentiometer category for other options.
