MCP4132-104E/SN

Digital Potentiometers Overview

The MCP4132-104E/SN is a single-channel digital rheostat manufactured by Microchip Technology. It features an 8-bit resistor network providing 256 taps and 257 steps, with a nominal resistance (RAB) of 100 kΩ. The device operates on a supply voltage range of 1.8V to 5.5V and utilizes a high-speed SPI serial interface for wiper control. It employs volatile RAM memory, resetting the wiper to mid-scale upon power-up or brown-out events. Key electrical characteristics include a typical wiper resistance of 75 Ω, a bandwidth of 1 MHz at 100 kΩ, and operation across an extended temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Single-channel digital rheostat configuration with 8-bit resolution (256 taps).
• Nominal resistance options including 100 kΩ (-104 suffix) with ±20% tolerance.
• High-voltage tolerant digital inputs supporting up to 12.5V on CS, SCK, and SDI pins.
• Integrated terminal disconnect feature via Shutdown pin (SHDN) or TCON register.

Digital Potentiometers Applications

• Variable gain control in audio and instrumentation amplifiers.
• Programmable biasing networks for analog circuits.
• Digital potentiometer replacement in rheostat configurations for current limiting.
• Voltage reference adjustment in sensor signal conditioning.

Digital Potentiometers Procurement Notes

Verify the specific resistance value indicated by the ordering suffix against the required circuit design. Confirm that the system architecture supports volatile memory behavior, as wiper settings are lost during power cycles. Ensure the PCB layout accommodates the SOIC-8 package dimensions and thermal requirements for the specified operating temperature range.

Digital Potentiometers Selection Notes

Select this component when a single-channel variable resistor is needed rather than a potentiometer. The 100 kΩ value suits applications requiring higher impedance levels compared to the 5 kΩ or 10 kΩ variants. Consider the 1.8V minimum supply voltage if operating in low-power systems, noting that SPI frequency limits decrease below 2.7V.

Digital Potentiometers Part Context

This part belongs to the MCP413X/415X family of 7-bit and 8-bit SPI digital potentiometers. The '1' in the model number denotes a single channel, while '2' indicates a rheostat configuration. The '104' suffix specifies the 100 kΩ resistance value. It shares the same pinout and interface logic as the MCP4131 (potentiometer mode) but differs in internal terminal connectivity.

Digital Potentiometers Replacement Considerations

The MCP4132-104E/SL serves as a tape-and-reel alternative to the tube-packaged SN variant. For non-volatile memory requirements, the MCP4162-104E/SN provides equivalent electrical performance with EEPROM storage instead of volatile RAM.