MCP4461T-502E/ST

Digital Potentiometers Overview

The MCP4461T-502E/ST is a quad rheostat digital potentiometer IC manufactured by Microchip Technology. It features four independent resistor networks with a nominal resistance of 5 kΩ and 8-bit resolution, providing 257 taps. The device utilizes an I2C serial interface for control and includes nonvolatile memory to retain wiper settings. It operates within a supply voltage range of 2.7V to 5.5V and supports high-voltage tolerant digital inputs up to 12.5V. The component is housed in a TSSOP-20 package and is rated for operation from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Quad Resistor Network: Four independent 5 kΩ rheostats with 8-bit (257 tap) resolution.
• Nonvolatile Memory: EEPROM retains wiper settings and includes WiperLock™ technology.
• High-Voltage Inputs: Digital inputs tolerate voltages up to 12.5V, supporting split-rail applications.
• I2C Interface: Supports Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes.

Digital Potentiometers Applications

• Programmable gain amplifiers
• Voltage reference adjustment
• Audio volume control
• Sensor biasing

Digital Potentiometers Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging and 'E' denotes RoHS compliance. Confirm the '502' code corresponds to the 5 kΩ resistance value. Ensure the TSSOP-20 package matches the target PCB footprint. Check for AEC-Q100 qualification if automotive reliability is required.

Digital Potentiometers Selection Notes

Select this model over volatile variants (MCP445X) when power-down retention is necessary. Choose the 5 kΩ version for lower noise and higher bandwidth compared to 50 kΩ or 100 kΩ options. Ensure the system voltage does not exceed 5.5V on VDD while respecting the 12.5V limit on HVC/A0.

Digital Potentiometers Part Context

This part belongs to the MCP444X/446X family of quad I2C digital potentiometers. The MCP4461 variant specifically offers nonvolatile memory and 8-bit resolution, distinguishing it from the volatile MCP4451 and the 7-bit MCP4441.

Digital Potentiometers Replacement Considerations

Direct functional substitutes include other MCP4461 variants with different resistance values (e.g., MCP4461-103E/ST for 10 kΩ). Cross-model replacements like MCP4442 offer similar functionality but with 7-bit resolution and potentially different power-up states.

Digital Potentiometers FAQ

What is the maximum voltage tolerance for the digital input pins?

The HVC/A0, A1, SCL, SDA, WP, and RESET pins are high-voltage tolerant and can withstand up to 12.5V with respect to VSS.

How many taps does the 8-bit resolution provide?

The 8-bit resolution provides 256 resistors, resulting in 257 distinct taps or positions.

Does the device support hardware write protection?

Yes, the MCP4461 supports hardware write protection via the WP control pin and software write protection via a configuration bit.