Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | 7-bit volatile digital potentiometer |
| Nominal resistance | 5 kΩ |
| Wiper positions | 128 |
| Interface | I²C-compatible |
| Digital supply operation | 1.8 V to 5.5 V |
| Analog specification range | 2.7 V to 5.5 V |
| Terminal B | Internally connected to ground |
| Family status | In Production |
Product Overview
The MCP4018T-502E/LT is the 5 kΩ extended-temperature version of Microchip’s MCP4018 volatile I²C digital potentiometer in SC70-6. It provides 128 wiper settings while internally connecting terminal B to ground, simplifying grounded-divider applications.
That internal B-to-ground connection is the key topology constraint. The device should not be substituted for a fully floating three-terminal digital potentiometer where both ends of the resistor string must be independently accessible.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Resolution | 7 bit / 128 steps |
| Nominal resistance | 5 kΩ |
| Digital operating voltage | 1.8 V to 5.5 V |
| Analog specified voltage | 2.7 V to 5.5 V |
| Typical wiper resistance | ~100 Ω at VDD = 5.5 V, IW = 2 mA, code 00h |
| Typical static current | 2.5 µA |
| I²C standard mode | Up to 100 kHz |
| I²C fast mode | Up to 400 kHz at specified bus conditions |
| Typical ratiometric tempco | ~15 ppm/°C at midscale |
| Operating temperature | -40°C to +125°C |
| Package | SC70-6 |
Design Considerations
Wiper resistance becomes a larger percentage of the programmed value at low codes. Include it in the divider error budget, especially with the 5 kΩ element.
Because the setting is volatile, firmware should restore the required code after power-up. The grounded B terminal should also be reflected in schematic symbol and PCB review to prevent accidental floating use.
Related Engineering Resources
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For a different 5-kohm digital resistance control topology, compare MCP4017T-502E/LT. Microchip DS22147 lists this MCP4018 as an I2C-controlled three-terminal potentiometer configuration to ground, while MCP4017 is the two-terminal rheostat configuration. Both -502E/LT codes are 5-kohm SC70-6 options, but the pin functions differ; check wiring before selection. This is a circuit-topology selection comparison, not a pin-compatible replacement statement.
