MCP4161T-503E/SN

Digital Potentiometers Overview

The MCP4161T-503E/SN is a single-channel, non-volatile digital potentiometer manufactured by Microchip Technology. It features an 8-bit resolution providing 257 discrete taps and a nominal resistance (R_AB) of 50 kΩ with ±20% tolerance. The device operates on a supply voltage range of 2.7V to 5.5V for full specifications, supporting serial interface operation down to 1.8V. It utilizes an SPI interface compatible with modes 0,0 and 1,1, allowing high-speed read/write access to wiper registers and Data EEPROM. Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of 200 kHz at 50 kΩ, and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Non-Volatile Memory: WiperLock™ technology automatically recalls saved wiper settings upon power-up using internal Data EEPROM.
• High Voltage Tolerant Inputs: Digital input pins (CS, SCK, SDI, WP, SHDN) tolerate voltages up to 12.5V, enabling split-rail applications.
• SPI Interface: Supports standard SPI modes 0,0 and 1,1 with clock frequencies up to 10 MHz at V_DD ≥ 2.7V.
• Terminal Disconnect: Allows resistor network terminal disconnection via the Shutdown pin (SHDN) or Terminal Control (TCON) register.

Digital Potentiometers Applications

• Remote calibration of sensor gain and offset in industrial data acquisition systems.
• Volume control and tone adjustment in audio equipment requiring memory retention.
• Variable gain amplifiers and programmable filters in communication devices.
• Power supply voltage trimming and bias current adjustment in mixed-signal circuits.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'SN' corresponds to the SOIC-8 package when sourcing replacements. Confirm that the 'T' suffix indicates tape-and-reel packaging if reel quantity is required. Ensure the specific resistance value '503' (50 kΩ) matches the design requirements, as other values like 5kΩ or 10kΩ exist within the same family. Check for RoHS compliance status in the latest manufacturer documentation.

Digital Potentiometers Selection Notes

Select this component when non-volatile storage of the wiper position is required after power cycles. The 50 kΩ resistance value offers a balance between noise immunity and power consumption compared to lower resistance options. Ensure the system SPI clock speed does not exceed 10 MHz for V_DD levels above 2.7V. For applications requiring separate data and command lines, consider the MCP41X1 variant instead, as this model uses dedicated SDI and SDO pins.

Digital Potentiometers Part Context

This part belongs to the MCP414X/416X/424X/426X family of SPI digital potentiometers. The '4161' designation indicates a single-potentiometer configuration with 8-bit resolution and non-volatile memory. It is distinct from the RAM-only variants (MCP4131/4151) which lose settings on power loss. The SOIC-8 package provides a compact surface-mount solution suitable for space-constrained PCB designs.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same package and specification include other MCP4161 variants with different resistance values (e.g., MCP4161-103E/SN for 10 kΩ). Cross-family replacement requires verifying pin compatibility and memory type, as MCP4141 offers similar features but with 7-bit resolution.