MCP4012T-502E/CH

Overview

The MCP4012T-502E/CH is a volatile, 6-bit digital potentiometer from Microchip Technology. It features a 5 kΩ nominal resistance (R_AB) with 63 resistors and taps to Terminal A and Terminal B, providing 64 distinct tap positions. The device operates on a simple Up/Down (U/D) serial interface and supports a wide operating voltage range of 1.8V to 5.5V for device operation, with resistor characteristics specified from 2.7V to 5.5V. Packaged in a compact SOT-23-6 surface-mount format, it offers low power consumption with a maximum static current of 1 µA when the serial interface is inactive.

Feature Summary

• 64-tap resolution controlled via a simple 2-wire Up/Down serial interface
• High-voltage tolerant digital inputs capable of up to 12.5V
• Low wiper resistance of 75 Ω typical and low temperature coefficient of 50 ppm/°C typical
• Power-on recall of default mid-scale wiper setting

Applications

• Variable gain control in audio circuits
• Programmable biasing for analog sensors
• Adjustable reference voltage generation
• System calibration and trimming

Procurement Notes

Verify that the specific suffix 'CH' aligns with your required environmental or manufacturing specifications, as datasheet parameters are typically defined for the standard 'E' variant. Confirm the package type is SOT-23-6 and ensure the volatile memory requirement matches your system's power cycling behavior. Cross-reference the manufacturer part number directly with official Microchip documentation to validate all electrical limits.

Selection Notes

Select this component if a rheostat configuration with a 5 kΩ total resistance is required. The U/D interface is suitable for systems where pin count must be minimized compared to SPI or I2C alternatives. Ensure the application voltage remains above 2.7V if precise resistor characteristics and linearity are critical, as performance below this threshold may deviate from standard specifications.

Part Context

This part belongs to the MCP4011/2/3/4 family of low-cost, 64-step volatile digital potentiometers. While the MCP4011 and MCP4013 are configured as potentiometers, the MCP4012 and MCP4014 are designed specifically for rheostat applications. All variants share identical electrical characteristics and control protocols but differ in internal terminal connections.

Replacement Considerations

MCP4012T-502E/MC: Same electrical specifications and functionality; differs only in the package suffix (MC vs CH).

FAQ

What is the default wiper position upon power-up?

The device defaults to a mid-scale wiper setting (hex code 1Fh) upon power-up.

Can the CS and U/D pins handle voltages higher than VDD?

Yes, the digital inputs are high-voltage tolerant and can withstand up to 12.5V regardless of the VDD supply level.

How does the MCP4012 differ from the MCP4011?

The MCP4012 is configured as a rheostat, whereas the MCP4011 is configured as a potentiometer. Electrically, they are otherwise identical.