MCP4161-503E/SN

Digital Potentiometers Overview

The MCP4161-503E/SN is a single-channel, non-volatile digital potentiometer from Microchip Technology. It features an 8-bit resolution with 257 taps and a nominal resistance (R_AB) of 50 kΩ. The device operates on a supply voltage range of 2.7V to 5.5V and utilizes a high-speed SPI serial interface supporting up to 10 MHz. Key specifications include a typical wiper resistance of 75 Ω, low temperature coefficients, and WiperLock™ technology for secure memory storage. It is housed in an 8-pin SOIC package.

Digital Potentiometers Feature Summary

• Non-volatile Memory: Stores wiper settings using WiperLock™ technology for automatic recall upon power-up.
• High Voltage Inputs: Digital input pins tolerate voltages up to 12.5V, supporting split-rail applications.
• SPI Interface: Supports 10 MHz operation in Modes 0,0 and 1,1 with hardware and software write protect options.
• Terminal Disconnect: Allows resistor network disconnection via the SHDN pin or TCON register.

Digital Potentiometers Applications

• Gain control in audio and instrumentation circuits
• Voltage reference adjustment
• Programmable filter frequency setting
• System calibration and trimming

Digital Potentiometers Procurement Notes

Verify the specific suffix 'SN' corresponds to the 8-lead Small Outline Integrated Circuit (SOIC) package type as defined in the datasheet. Confirm that the '-503' designation matches the required 50 kΩ resistance value for the application. Ensure the design supports the 2.7V to 5.5V operating voltage range and utilizes the appropriate SPI timing parameters.

Digital Potentiometers Selection Notes

Select this component when a single-channel, non-volatile digital potentiometer with 50 kΩ resistance is required. The 8-bit resolution provides 256 steps for precise adjustment. Consider the high-voltage tolerant inputs if interfacing with logic levels exceeding the VDD supply. Verify that the SOIC-8 package dimensions fit the PCB layout constraints.

Digital Potentiometers Part Context

This part belongs to the MCP416X family of single-channel digital potentiometers. It shares architectural similarities with the MCP414X (7-bit) and MCP415X (volatile 8-bit) variants but is distinguished by its 8-bit non-volatile memory and 50 kΩ resistance option. It is functionally comparable to other single-pot devices in the MCP41XX series.

Digital Potentiometers Replacement Considerations

Direct replacements within the same package and specification include the MCP4161-503E/MS (MSOP-8 package) or MCP4161-503E/P (PDIP-8 package). For functional substitution without package compatibility, consider other MCP4161 variants with different resistance values or packages, ensuring SPI interface and voltage requirements are met.

Digital Potentiometers FAQ

What is the maximum SPI clock frequency for this device?

The MCP4161-503E/SN supports an SPI clock frequency of up to 10 MHz when the supply voltage (VDD) is between 2.7V and 5.5V.

How does the device handle power-up states?

The device features Non-Volatile Memory with WiperLock™ technology. Upon power-up, it automatically recalls the last saved wiper setting stored in the EEPROM, rather than resetting to a default mid-scale position.

Can the digital inputs withstand voltages higher than VDD?

Yes, the digital input pins (CS, SCK, SDI, WP, SHDN) are high-voltage tolerant and can withstand voltages up to 12.5V, even when VDD is lower.