MCP47DA1T-A1E/OT

Digital Potentiometers Overview

The MCP47DA1 is a volatile, 6-bit digital potentiometer featuring a buffered output controlled via an I2C serial interface. It provides 65 taps with a typical VREF pull-down resistance of 30 kΩ. The output voltage range is windowed between 1/3 and 2/3 of VREF. Operating from 1.8V to 5.5V, it supports SMBus 2.0 protocols with slave addresses 5Ch and 7Ch. Key electrical parameters include a typical static current of 100 µA, a bandwidth of 100 kHz (-3 dB), and a temperature coefficient of 15 ppm/°C. It includes brown-out reset protection and defaults to mid-scale upon power-up.

Digital Potentiometers Feature Summary

• 6-Bit Resolution: 65 taps (64 resistors) with wiper codes 00h to 7Fh.
• Windowed Output: VOUT range limited to 1/3 * VREF to 2/3 * VREF.
• I2C Interface: Supports SMBus 2.0 Write/Read Byte/Word formats; addresses 5Ch and 7Ch.
• Low Power: Typical static current of 100 µA at 5.5V.

Digital Potentiometers Applications

• PC Servers for I2C protocol-based set point or offset trimming.
• Cost-sensitive mechanical trim pot replacement.
• Threshold calibration circuits requiring buffered analog outputs.

Digital Potentiometers Procurement Notes

Verify the specific package variant (SOT-23-6 or SC70-6) required for the PCB layout, as thermal resistance differs between packages. Confirm that the application utilizes volatile memory, as data is lost upon power cycle. Ensure the I2C bus speed matches the device's support for Standard (100 kHz) or Fast (400 kHz) modes within the valid voltage range.

Digital Potentiometers Selection Notes

Select this component when a buffered, low-cost 6-bit DAC is needed with a restricted output window. Note that analog characteristics are specified for VDD ≥ 2.7V, while digital operation extends to 1.8V. The external reference voltage must be compatible with the 1/3 to 2/3 output constraint. Consider the 100 µA static current for battery-powered designs where power conservation is critical.

Digital Potentiometers Part Context

The MCP47DA1 belongs to Microchip's family of volatile digital potentiometers. Unlike non-volatile variants, it does not retain the wiper setting after power loss, defaulting to mid-scale (40h). It serves as a direct replacement for mechanical potentiometers in applications where digital control via I2C is preferred over manual adjustment.

Digital Potentiometers Replacement Considerations

Direct pin-compatible replacements within the same package may include other MCP47DA1 variants with different suffixes indicating package type (e.g., SOT-23-6 vs. SC70-6). Verify that substitute parts maintain the same 6-bit resolution, I2C addressing, and windowed output characteristics.