Microchip Technology MCP41050-I/SN

Overview

MCP41050-I/SN from Microchip Technology is a single-channel, 256-tap digital potentiometer with 50 kΩ nominal resistance, SPI™ serial interface (mode 0,0 and 1,1), ±1 LSB max INL/DNL, and operates from 2.7V to 5.5V supply. It functions as a programmable rheostat or voltage divider in precision gain/offset calibration circuits for sensor signal conditioning.

For engineers reviewing the MCP41050-I/SN datasheet, MCP41050-I/SN pinout, MCP41050-I/SN application, or MCP41050-I/SN equivalent, key selection criteria include wiper resistance (125–250 Ω), shutdown capability via software command, static supply current ≤1 µA, and SOIC-8 package compatibility with board space-constrained analog front-ends.

Technical Context

The MCP41050-I/SN implements an 8-bit wiper register controlling a linear resistor array between terminals PA0, PB0, and PW0. Its SPI interface uses CS-active-low framing with data latched on SCK rising edge and supports mid-scale power-up reset (code 80h).

It operates exclusively in single-potentiometer configuration with no SHDN or RS pins-unlike dual-channel MCP42XXX variants-and lacks daisy-chain capability due to absence of SO pin. All digital inputs feature Schmitt-triggered thresholds for noise immunity.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (SOIC-8, 3.9mm width), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer applications.

Compared with AD5175BRMZ-50 and MCP42050-I/P, the MCP41050-I/SN offers SPI-native operation without level translation overhead and guaranteed mid-scale startup behavior-critical for fail-safe analog subsystems-but lacks dual-channel capability or sub-microamp static current.

Availability

MCP41050-I/SN is available at Aetrix Electronics and suitable for sensor calibration, programmable gain amplifiers, and laser bias control requiring stable component supply with full traceability and long-term obsolescence management.

Supply support for MCP41050-I/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions for industrial, automotive, and consumer markets.

The MCP41XXX family was designed specifically for replacing mechanical potentiometers in precision analog trimming applications-emphasizing low drift, SPI simplicity, and robust power-on behavior in embedded systems.

FAQ

What is the maximum clock frequency supported by the MCP41050-I/SN SPI interface?

The MCP41050-I/SN supports up to 10 MHz SPI clock frequency at VDD = 5V. Timing parameters including tSU (40 ns setup), tHD (10 ns hold), and tDO (80 ns SO propagation delay) ensure reliable communication with standard microcontroller SPI peripherals. Operation at lower VDD (e.g., 2.7V) may require derating clock speed per AC timing specifications in DS11195C.

Does the MCP41050-I/SN have hardware shutdown or reset pins?

No, the MCP41050-I/SN does not include hardware SHDN or RS pins. These features are exclusive to the dual-channel MCP42XXX series. Shutdown must be implemented via SPI command (0x0000 write to shutdown register), and reset to mid-scale (80h) occurs automatically at power-up only-no external pin is provided for hardware-initiated reset.

Can the MCP41050-I/SN be used in rheostat mode with only two terminals connected?

Yes, the MCP41050-I/SN supports rheostat mode: connect PA0 and PB0 as the two endpoints, and use PW0 as the variable terminal. The unused endpoint (typically PB0) must be shorted to PW0 to disable the internal switch matrix and minimize wiper resistance impact. This configuration achieves 0–50 kΩ adjustable resistance with 195 Ω/step resolution.

What is the wiper resistance specification for the MCP41050-I/SN across its operating voltage range?

The MCP41050-I/SN wiper resistance is specified as 125–175 Ω at VDD = 5.5V and 175–250 Ω at VDD = 2.7V (I_W = 1 mA, code 00h). This voltage-dependent variation directly affects minimum achievable resistance and high-frequency bandwidth-designers should model it as a series element in precision gain networks.

Is the MCP41050-I/SN pin-compatible with other members of the MCP41XXX family?

Yes, all MCP41XXX variants-including MCP41010-I/SN (10 kΩ) and MCP41100-I/SN (100 kΩ)-share identical SOIC-8 pinout and SPI command structure. Resistance value is the only functional difference; no PCB or firmware changes are required when substituting within the same package variant.