Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Channels | 1 linear-taper potentiometer |
| Resistance | 100 kΩ end-to-end |
| Resolution | 256 positions |
| Interface | SPI-compatible |
| Topology | Three-terminal potentiometer or two-terminal rheostat |
| Supply | 2.7 V to 5.5 V |
| Temperature Coefficient | 35 ppm/°C nominal stated feature |
| Exact Package / Packing | SOT-23 (DCN), 8 pins; 3000-piece large tape and reel |
Product Overview
TPL0501-100DCNR is a single-channel 100 kΩ digital potentiometer controlled through SPI. Unlike TPL0401A, it exposes both end terminals and can be used either as a three-terminal divider or a two-terminal rheostat.
Its 256 positions provide twice the nominal step count of a 128-tap device, but end-to-end resistance tolerance and wiper resistance still matter when the part is used as an absolute variable resistor. Divider applications usually benefit more from ratio accuracy than from absolute 100 kΩ accuracy.
This part has volatile control rather than the nonvolatile wiper storage offered by TPL0102. Firmware must therefore write the desired state after power-up if a non-default setting is required.
For related devices, see HKEQGOO’s Digital Potentiometers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TPL0501-100DCNR |
| Channels | 1 linear-taper potentiometer |
| Resistance | 100 kΩ end-to-end |
| Resolution | 256 positions |
| Interface | SPI-compatible |
| Topology | Three-terminal potentiometer or two-terminal rheostat |
| Supply | 2.7 V to 5.5 V |
| Temperature Coefficient | 35 ppm/°C nominal stated feature |
| Exact Package / Packing | SOT-23 (DCN), 8 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | NF5J / NF5T |
Functional Highlights
SPI can update trim state without I²C address conflicts
Chip-select controls device selection directly, useful when several potentiometers share a bus and GPIO CS lines are available.
256 taps improve setpoint granularity, not necessarily absolute resistance accuracy
A smaller step does not eliminate ± resistance tolerance or wiper effects. Calibration algorithms should use the parameter that matters to the actual divider/rheostat topology.
Design Considerations
- Initialize the desired wiper value after every power cycle because this part does not provide the nonvolatile feature of TPL0102.
- Check wiper current and terminal voltage limits in rheostat mode.
- Use ratio-based calibration where possible if absolute end-to-end resistance tolerance would dominate error.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TPL0501-100DCNR as Active / Production; SOT-23 (DCN), 8 pins; 3000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +125°C; markings NF5J/NF5T.
Related Engineering Resources
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