MCP41050-E/P - 50k SPI Digital Potentiometer | Microchip
料号： MCP41050-E/P ✓ 量产中MCP41050-E/P 概述
A digital potentiometer is a programmable resistor whose effective tap position is stored as an 8-bit code. The MCP41050-E/P places one digitally controlled resistor between two analog terminals and presents a wiper output. This digital potentiometer belongs to the MCP41XXX family of single-channel, 256-position devices and sits within the broader category of passive analog components controlled by interface ICs.
The principal benefits are 8-bit resolution, 256 discrete wiper settings, and SPI-based control. The wiper position varies linearly with the code written to the device, making the MCP41050-E/P useful for programmable gain, attenuation, bias adjustment, threshold setting, sensor calibration, and feedback-loop compensation. Its 50 kΩ resistance provides a practical balance between divider precision, signal range, and component loading.
The device supports a 2.7 V to 5.5 V supply range and uses a serial interface that allows the wiper code to be updated by a host controller. Its maximum integral nonlinearity is specified as ±1 LSB, while the 256-position architecture corresponds to 8-bit resolution. The -E device variant is supplied in a through-hole PDIP package, making it convenient for prototypes, educational boards, and assemblies that favor socketed or leaded components.
Typical applications include audio volume and attenuation control, sensor signal conditioning, programmable reference circuits, laboratory equipment, industrial control modules, and microcontroller-based instrumentation. Because the resistance changes under digital control, the part can eliminate electromechanical potentiometers where reliability, repeatability, or remote adjustment matters.
When laying out a circuit, route the SPI signals away from sensitive analog inputs, keep the wiper connection short, and treat terminal resistance, wiper impedance, and the load connected to the wiper as part of the signal-path design. Confirm the programmed resistance against the required transfer function, because the ideal 8-bit relationship does not remove the effects of finite output resistance and load error.
直接替换替代料： MCP41050-E/P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MCP41050-E/P （相同外形与封装尺寸） ——差异在于 Device Type, Number of Taps, Package.
MCP41050-I/P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →MCP41050-E/P 规格参数
| Device Type | Single-channel digital potentiometer |
| Number of Circuits | 1 circuit |
| Nominal End-to-End Resistance | 50 kΩ |
| 分辨率 | 8 bit |
| Number of Taps | 256 taps |
| 接口 | 3-wire SPI |
| SPI Clock Modes | Mode 0,0 and Mode 1,1 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Wiper Control | Linear position variation controlled through SPI |
| Integral Nonlinearity | ±1 LSB maximum |
| 封装 | 8-pin PDIP, 0.300 inch body width, 7.62 mm pitch |
| 安装类型 | Through-hole |
| Packaging | Tube |
| RoHS 状态 | Compliant |
MCP41050-E/P 8-pin pdip, 0.300 inch body width, 7.62 mm pitch 引脚配置指南
MCP41050-E/P（8-pin pdip, 0.300 inch body width, 7.62 mm pitch 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MCP41050-E/P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MCP41050-E/P 适用于 6 应用s: Programmable Audio Attenuation, Sensor Signal Conditioning, Programmable Reference Voltage, Industrial Control and Calibration, Test and Measurement Front End, Embedded Control and Educational Platforms.
Programmable Audio Attenuation
The MCP41050-E/P is suitable for software-controlled audio attenuation because its 50 kΩ resistance and 256 linearly coded wiper positions provide 8-bit adjustment resolution. Place the device as a programmable divider and use an op-amp buffer when the source impedance is too low or the load requires a low-output-impedance drive. The SPI interface allows gain settings to be changed without a mechanical potentiometer, eliminating wiper wear and enabling presets or environmental compensation. Designers should verify the maximum signal amplitude, bandwidth, wiper impedance, and load at the buffered output against the manufacturer electrical characteristics.
推荐
Sensor Signal Conditioning
The MCP41050-E/P can adjust sensor excitation, amplifier thresholds, or a feedback reference when a digital calibration function is required. Its 256 SPI-programmed positions allow a controller to apply repeatable gain corrections during initialization or calibration. The 50 kΩ resistance is suitable for many divider networks, but the selected resistance values must remain within the device's effective range after wiper impedance is considered. Place the programmable element close to the analog conditioning stage, keep the SPI routing away from high-impedance sensor nodes, and validate the resulting transfer curve over the full intended signal range.
推荐
Programmable Reference Voltage
Using the MCP41050-E/P in a divider with a fixed reference allows a controller to synthesize a programmable voltage or current reference. The 8-bit code and 256 available wiper positions make the part appropriate for coarse calibration where fine trim is handled separately or where 1 LSB resolution is sufficient. For accurate references, account for wiper impedance and the divider's effective output resistance, and avoid loading the wiper with low input impedance. Firmware can store the desired code after a calibration measurement so the control system restores the correct setting after reset or power cycling.
推荐
Industrial Control and Calibration
The MCP41050-E/P supports industrial modules that require stored, repeatable adjustment values instead of manual potentiometer access. A controller can write one of 256 codes to set a limit, trim, or compensation point, reducing production calibration time and improving unit-to-unit consistency. The 2.7 V to 5.5 V operating range supports common embedded supply rails, while the PDIP package simplifies through-hole assembly and prototype rework. For harsh installations, verify the operating-temperature grade, isolate the SPI bus from electrical noise, and validate the control loop across supply tolerance and temperature extremes.
推荐
Test and Measurement Front End
The MCP41050-E/P can provide programmable attenuation or reference adjustment in a compact test fixture. Its 8-bit resolution permits repeatable instrument settings, while SPI control allows a host computer or embedded controller to automate sweeps and calibration sequences. Use the device within its specified supply range and confirm signal bandwidth, wiper impedance, and output loading before assigning it to precision measurement paths. A dedicated buffer may be required when driving high-impedance meters or subsequent analog stages, and the digital interface should be synchronized with analog switching to avoid transient control errors.
推荐
Embedded Control and Educational Platforms
The MCP41050-E/P is useful on microcontroller learning platforms because the SPI interface exposes a programmable analog function through three digital control lines. Students can sweep the 256 wiper codes, observe the analog output, and compare the resulting resistance against ideal calculations. The through-hole PDIP package is convenient for breadboards, perfboards, and educational prototypes. Because the effective step and output resistance are not perfectly ideal, use the MCP41050-E/P for conceptual and ordinary control experiments rather than assuming laboratory-grade accuracy without calibration and load analysis.
推荐
推荐产品汇总
工程参考数据： MCP41050-E/P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MCP41050-I/P |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 8-pin PDIP, 0.300 inch body width, 7.62 mm pitch | 8-pin PDIP, 0.300 inch body width, 7.62 mm pitch |
| Device Type | Single-channel digital potentiometer | Single-channel digital potentiometer |
| Number of Circuits | 1 circuit | 1 circuit |
| End-to-End Resistance | 50 kΩ nominal | 50 kΩ nominal |
| Resolution | 8 bit | 8 bit |
| Number of Taps | 256 taps | 256 taps |
| Interface | 3-wire SPI | 3-wire SPI |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Integral Nonlinearity | ±1 LSB maximum | ±1 LSB maximum |
| Temperature-Grade Suffix | -E/P | -I/P |
关键差异点
- Single-channel 50 kΩ element with full 8-bit control （对比 MCP41050-I/P)
- Through-hole PDIP package supports prototype rework （对比 MCP41050-E/SN)
- Linear code-to-wiper control simplifies firmware （对比 AD5206)
设计说明
Assign the PCB footprint from the manufacturer's 8-pin PDIP drawing and preserve the 7.62 mm lead pitch and pin-1 orientation. Place the device close to the analog network so the wiper trace remains short. Keep CS, SCLK, and SI routing away from the wiper and sensitive analog terminals; use a common ground reference and route returns directly to the device ground pin rather than through high-current switching paths.
Treat the programmed resistance as a loaded network rather than an ideal divider. The selected wiper position has finite wiper impedance, and loading the wiper changes both the effective output and the usable bandwidth. Use a buffer when driving a low-impedance load, and calculate the maximum allowed source impedance for the required settling time. This is especially important when the MCP41050-E/P controls an audio gain stage or a precision measurement input.
Configure SPI for Mode 0,0 or Mode 1,1 and confirm the clock polarity, phase, setup time, hold time, and maximum frequency against the manufacturer timing diagram. Do not confuse the 50 kΩ nominal end-to-end resistance with the resistance measured from a single terminal to the wiper under load. Also verify that a quoted alternative uses the PDIP package rather than the SOIC option because those land patterns are not interchangeable.
Keep digital control transitions away from high-impedance analog nodes and avoid routing CS or SCLK beneath sensitive analog nets. If SPI activity causes audible noise or measurement disturbance, lower the clock rate, stagger code updates, and add filtering after a buffer rather than at the raw wiper. Firmware should avoid unnecessary full-range code sweeps during sensitive conversions when a settled measurement is required.
合规信息
RoHS compliance is indicated for the MCP41050 product family. No additional REACH, halogen-free, conflict-minerals, or automotive qualification statement is specified for the exact MCP41050-E/P ordering code.
