MCP41100-I/P - 100kΩ 8-Bit SPI Digital Potentiometer | Microchip
料号： MCP41100-I/P ✓ 量产中MCP41100-I/P 概述
A digital potentiometer is a solid-state resistor whose effective resistance or voltage-divider tap is controlled electronically. The MCP41100 belongs to the digital potentiometer hierarchy, combining a resistor array, switch matrix, wiper circuitry, and serial interface in one integrated circuit. This eliminates moving contacts, improves repeatability, and supports remote configuration through a microcontroller or embedded control system.
The MCP41100-I/P provides 8-bit resolution across 256 positions, a 100 kΩ nominal end-to-end resistance, and SPI control. Its linear wiper characteristic simplifies calculations when the device is used as a voltage divider, a programmable attenuation element, or an adjustable resistance in control and measurement circuits. The 8-bit interface also allows the controller to select a position using an 8-bit command word.
The device uses a 3-wire serial interface compatible with the SPI communication format identified by Microchip for the MCP4XXXX family. The target MCP41100-I/P is supplied in the 8-pin PDIP package, allowing through-hole assembly and prototyping. For compact production boards, the manufacturer also offers MCP41100 variants in surface-mount packages, but those package variants require corresponding land-pattern and assembly changes.
Typical applications include firmware-controlled gain adjustment, sensor calibration, programmable dividers, test and measurement front ends, industrial control boards, and educational prototyping systems. An MCU can update the wiper position while the analog circuit remains electrically isolated from mechanical wear and repeated adjustment.
When laying out the circuit, treat the two resistor terminals as analog nodes and keep the SPI traces away from sensitive wiper and divider outputs. Confirm the programmed endpoint behavior and usable wiper range in the application because digital potentiometers may exhibit endpoint tolerance and wiper nonlinearity. Confirm the exact voltage, current, and temperature limits against the manufacturer datasheet before committing the design to production.
This page combines the manufacturer device description, exact MPN package information, interface characteristics, pin-compatible family candidates, and practical design guidance. It also distinguishes true package-compatible alternatives from surface-mount and other-package variants that cannot replace MCP41100-I/P without PCB changes.
直接替换替代料： MCP41100-I/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： MCP41100-I/P （相同外形与封装尺寸） ——差异在于 Device Type, Package, Resolution, Differential Nonlinearity (DNL), End-to-End Resistance.
MCP41100-E/P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →MCP41110-I/P
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MCP41150-I/P
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MCP41100-I/P 规格参数
| Device Type | Single-channel digital potentiometer |
| 分辨率 | 8 bit |
| Number of Wiper Positions | 256 positions |
| Nominal End-to-End Resistance | 100 kΩ |
| Serial Interface | 3-wire SPI |
| Wiper Characteristic | Linear |
| Number of Channels | 1 channel |
| 封装 | 8-pin PDIP |
| Package Type | PDIP-8, 0.3-inch plastic DIP |
| 安装类型 | Through-hole |
| Static Operation Current | <1 µA |
| Shutdown Feature | Software shutdown disconnects terminal A and connects the wiper to the terminal selected by the datasheet configuration |
MCP41100-I/P pdip-8, 0.3-inch plastic dip 引脚配置指南
MCP41100-I/P（pdip-8, 0.3-inch plastic dip 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： MCP41100-I/P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MCP41100-I/P 适用于 6 应用s: Programmable Voltage Divider, Sensor Calibration and Offset Adjustment, Programmable Gain and Attenuation, LED Current Adjustment, Embedded Test and Measurement, Arduino Prototyping and Education.
Programmable Voltage Divider
The MCP41100-I/P fits a programmable divider because its 100 kΩ resistor network and linear 8-bit wiper provide 256 digitally selectable positions. Connect the two resistor terminals across the divider supply and route the wiper to an ADC or comparator input. The controller can then adjust the division ratio without mechanical wear, although endpoint tolerance, wiper resistance, and ADC input loading should be included in the error budget. Use the manufacturer characteristic curves before treating the 8-bit command as an exact analog ratio.
Sensor Calibration and Offset Adjustment
The MCP41100-I/P can introduce a digitally controlled calibration element in front of a sensor amplifier. Its 256-position, linear wiper lets firmware trim a divider ratio or calibration offset while the MCP41100 handles the analog resistance and the controller handles the adjustment logic. This arrangement is useful when calibration settings must be stored or repeated across multiple boards. Confirm that the 100 kΩ impedance produces acceptable loading and that the wiper output remains within the measurement amplifier's input range.
Programmable Gain and Attenuation
A 3-wire SPI-controlled MCP41100-I/P can be used to trim a feedback network or attenuation path in a signal-conditioning circuit. The 100 kΩ end-to-end resistance supports divider-based implementations, while the 8-bit command provides 256 adjustment steps. The designer should recalculate divider values for the intended impedance and verify the wiper's influence on amplifier input bias, bandwidth, and noise. This is particularly useful where repeated mechanical recalibration would be inconvenient or inconsistent.
LED Current Adjustment
The MCP41100-I/P can control a digitally adjustable resistance in an LED drive circuit when the external transistor and current-sense topology support the wiper's electrical limits. The 100 kΩ digital potentiometer provides 256 positions for gradual brightness or test-current adjustment through SPI. Because the MCP41100-I/P is primarily a resistor-array device, verify its wiper and terminal current ratings, thermal dissipation, and output impedance before placing it directly in a high-current LED path.
Embedded Test and Measurement
The MCP41100-I/P is useful in a microcontroller-based test fixture for generating adjustable divider outputs or simulating a variable resistance. Its 8-bit resolution and 256 positions allow repeatable software-controlled stimulus levels, and the absence of mechanical contacts improves setting consistency between tests. For high-accuracy instrumentation, characterize endpoint error, wiper nonlinearity, leakage, and drift over the intended temperature range. Use a high-impedance measurement input so the 100 kΩ network is not loaded significantly.
Arduino Prototyping and Education
The MCP41100-I/P supports Arduino experiments involving programmable dividers, analog signal adjustment, and digitally controlled resistance. The controller can send an 8-bit wiper command over the 3-wire SPI interface and observe the resulting change with an analog input. The 8-pin PDIP package is convenient for breadboards and through-hole prototypes, although a dedicated MCP41100 module may use a different package and pin arrangement. Confirm the board's voltage limits and wiring sequence before applying power.
工程参考数据： MCP41100-I/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 | MCP41100-E/P | MCP41110-I/P | MCP41150-I/P |
|---|---|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP - same package | 8-pin PDIP - same package | 8-pin PDIP - same package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| End-to-End Resistance | 100 kΩ | 100 kΩ | 10 kΩ | 50 kΩ |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Wiper Positions | 256 positions | 256 positions | 256 positions | 256 positions |
| Number of Channels | 1 channel | 1 channel | 1 channel | 1 channel |
| Serial Interface | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI |
| Wiper Characteristic | Linear | Linear | Linear | Linear |
| Temperature-Grade Suffix | I/P | E/P - different temperature grade | I/P - same grade | I/P - same grade |
关键差异点
- Exact 100 kΩ resistance in a through-hole package （对比 MCP41110-I/P)
- Temperature-grade flexibility without changing the footprint （对比 MCP41100-E/P)
- Intermediate resistance option for divider and biasing designs （对比 MCP41150-I/P)
设计说明
Route the three SPI signals as a compact digital group and connect the ground and supply pins according to the MCP41100 datasheet pin-description table. Keep the resistor-terminal and wiper traces away from clocks, high-current switches, and digital edge crossings. Use a solid ground reference beneath or near the device when the wiper drives an ADC, because analog-divider accuracy can be affected by ground-bounce and supply ripple.
Treat the MCP41100-I/P as an 8-bit programmable resistor, not as a precision 8-bit DAC. The commanded code is digital, but the resulting wiper voltage also depends on endpoint tolerance, wiper resistance, nonlinearity, output loading, and supply stability. For a divider, select a high-impedance ADC or amplifier input and include the MCP41100's wiper impedance in the design calculation. Measure the usable code range during calibration rather than assuming codes 0 and 255 equal the resistor endpoints exactly.
Do not treat the MCP41100-I/SN surface-mount variant as a direct substitute for MCP41100-I/P; the package outlines and PCB land patterns differ. Likewise, changing from 100 kΩ to 10 kΩ or 50 kΩ can alter divider loading, available wiper current, amplifier biasing, and noise even though the SPI command format remains the same. Verify the exact MPN, package, resistance value, temperature grade, operating voltage, and wiper-current requirement before releasing the BOM.
合规信息
No specific compliance declaration for MCP41100-I/P appears in the product listings. Confirm RoHS, REACH, lead-free, halogen-free, AEC-Q100, and conflict-minerals status using the current manufacturer product documentation or project-specific material declarations.