MCP4462T-502E/ST

Digital Potentiometers Overview

The MCP4462T-502E/ST is a quad rheostat digital potentiometer from Microchip Technology, featuring an I2C serial interface and nonvolatile memory. It provides four independent 8-bit resistor networks with 257 taps, configured as variable resistors (rheostats). The device offers a nominal resistance of 5 kΩ (indicated by the '502' suffix) with a typical wiper resistance of 75 Ω. It operates within a supply voltage range of 2.7V to 5.5V for analog characteristics and supports I2C clock speeds up to 3.4 MHz. Key features include WiperLock technology for saving wiper settings in EEPROM, terminal disconnect capabilities via TCON registers, and high-voltage tolerant digital inputs up to 12.5V.

Digital Potentiometers Feature Summary

• Quad 8-bit Rheostat Configuration: Four independent resistor networks with 257 taps each, allowing precise resistance adjustment.
• Nonvolatile Memory with WiperLock: Stores wiper positions in EEPROM for automatic recall upon power-up or reset.
• High-Speed I2C Interface: Supports Standard Mode (100 kHz), Fast Mode (400 kHz), and High-Speed Mode (up to 3.4 MHz).
• High-Voltage Tolerant Inputs: Digital input pins (HVC/A0, SCL, SDA, etc.) tolerate voltages up to 12.5V, enabling mixed-voltage system integration.

Digital Potentiometers Applications

• Programmable gain amplifiers and attenuators in audio and signal processing circuits.
• Voltage reference trimming and calibration in measurement systems.
• Impedance matching networks in RF and communication interfaces.
• Digital control of analog parameters in industrial automation and instrumentation.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'T' indicates tape-and-reel packaging and '/ST' denotes the TSSOP-20 package type. Confirm the '502' suffix corresponds to the 5 kΩ resistance value. Ensure the 'E' suffix indicates RoHS compliance and lead-free status if required by your manufacturing specifications. Cross-reference the full part number with official Microchip documentation to confirm current production status and availability.

Digital Potentiometers Selection Notes

Select this component when a quad rheostat configuration is required rather than a potentiometer. The 8-bit resolution provides 256 steps, suitable for applications needing finer control than 7-bit devices. The 5 kΩ resistance value balances bandwidth and current handling; lower resistance values offer higher bandwidth but consume more power. Ensure the host microcontroller supports the desired I2C speed and that the 12.5V tolerant inputs align with the system's logic levels.

Digital Potentiometers Part Context

This part belongs to the MCP446X family of quad digital potentiometers with nonvolatile memory. Unlike the MCP444X series which also has NV memory, the MCP446X specifically denotes the 8-bit resolution variant with 257 taps. The 'MCP4462' designation specifies the rheostat configuration, where terminals A and B are used as fixed ends and W as the adjustable tap, unlike the MCP4461 which is a potentiometer.

Digital Potentiometers Replacement Considerations

Direct replacements within the same package and pinout include other MCP4462 variants with different resistance values (e.g., MCP4462T-103E/ST for 10 kΩ) or memory types (e.g., MCP4461 for potentiometer use). For 7-bit resolution, consider the MCP4452 series, though it lacks nonvolatile memory unless paired with external storage. Verify electrical compatibility, particularly wiper resistance and bandwidth, when substituting.