MCP47DA1T-A0E/LT

Digital Potentiometers Overview

The MCP47DA1T-A0E/LT is a volatile, single-channel, 6-bit digital potentiometer manufactured by Microchip Technology. It features a buffered output and an I2C serial interface for wiper control. The device provides 65 taps with a nominal resistance of 30 kΩ between VREF and VSS. The output voltage range is windowed to 1/3 VREF to 2/3 VREF. It operates on a supply voltage from 1.8V to 5.5V, with analog characteristics specified from 2.7V to 5.5V. Key electrical parameters include a typical static current of 100 µA, a settling time of 6 µs, and a bandwidth of 100 kHz. It supports SMBus 2.0 protocols and includes brown-out reset protection.

Digital Potentiometers Feature Summary

• 6-Bit Resolution: Provides 65 taps (64 resistors) with codes ranging from 00h to 7Fh.
• Windowed Output: Buffered output voltage range limited to 1/3 VREF to 2/3 VREF.
• I2C Interface: Supports SMBus 2.0 Write Byte/Word and Read Byte/Word formats with slave addresses 5Ch and 7Ch.
• Low Power Operation: Typical static current consumption of 100 µA.

Digital Potentiometers Applications

• PC Servers
• Set Point or Offset Trimming
• Cost-sensitive Mechanical Trim Pot Replacement

Digital Potentiometers Procurement Notes

Verify the specific package type (SOT-23-6 or SC70-6) required for the design, as the base model number covers both. Confirm that the application utilizes a volatile memory architecture, as the wiper setting is lost upon power loss. Ensure the I2C bus timing requirements are met for the target operating voltage and clock speed.

Digital Potentiometers Selection Notes

Select this component when a low-cost, single-channel digital potentiometer with a buffered output is needed. The 6-bit resolution and windowed output make it suitable for trimming applications where full-scale rail-to-rail output is not required. Verify that the external reference voltage (VREF) is within the allowable limits relative to the supply voltage (VDD).

Digital Potentiometers Part Context

The MCP47DA1 belongs to Microchip's family of volatile digital potentiometers. Unlike non-volatile variants, this device does not retain its wiper setting after power cycling unless a default power-on reset value is utilized. It is designed for applications requiring simple serial control of analog signals without the complexity of multi-channel interfaces.

Digital Potentiometers Replacement Considerations

Direct replacements must match the 6-bit resolution, I2C interface, and windowed output characteristics. Check pin compatibility between SOT-23-6 and SC70-6 packages if substituting based on footprint constraints. Ensure the replacement device supports the required SMBus 2.0 protocol speeds.