MCP4251-502E/P

Digital Potentiometers Overview

The MCP4251-502E/P is a dual-channel, 8-bit digital potentiometer manufactured by Microchip Technology in a 14-pin PDIP package. It features two independent potentiometer networks with a nominal resistance of 5 kΩ and 257 adjustment steps. The device operates on an SPI serial interface and utilizes volatile RAM for wiper storage, resetting to mid-scale upon power-up. Key electrical specifications include a supply voltage range of 1.8V to 5.5V, high-voltage tolerant digital inputs up to 12.5V, and an operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual 8-bit Potentiometer Networks: Provides two independent channels with 257 discrete resistance steps.
• SPI Serial Interface: Supports standard modes (0,0) and (1,1) with clock frequencies up to 10 MHz.
• High-Voltage Tolerant Inputs: Digital control pins tolerate voltages up to 12.5V regardless of VDD level.
• Volatile Memory Architecture: Wiper settings are stored in RAM and reset to mid-scale during power-on events.

Digital Potentiometers Applications

• Audio volume control and tone adjustment circuits
• Programmable gain amplifier configurations
• Variable voltage reference generation
• Sensor biasing and calibration adjustments

Digital Potentiometers Procurement Notes

Verify the 'P' suffix indicates the 14-lead Plastic Dual In-Line Package (PDIP). Confirm the '-502' code corresponds to the 5 kΩ resistance value. Ensure the 'E' suffix denotes compliance with RoHS standards and halogen-free manufacturing requirements as specified by the manufacturer.

Digital Potentiometers Selection Notes

Select this component when dual-channel analog resistance control is required within a single package. The 8-bit resolution offers 256 usable steps, suitable for applications not requiring fine-grained precision. The volatile memory characteristic necessitates re-initialization of wiper positions after every power cycle.

Digital Potentiometers Part Context

This part belongs to the MCP425X family, which provides dual resistor network options. It shares the same core architecture and pinout compatibility as the MCP423X series but differs in resolution; the MCP425X provides 8-bit (257-step) resolution compared to the 7-bit (129-step) resolution found in the MCP423X.

Digital Potentiometers Replacement Considerations

The MCP4231-502E/P serves as a functional substitute if lower 7-bit resolution is acceptable. For non-volatile memory requirements, consider the MCP4261-502E/P, which retains wiper settings across power cycles while maintaining identical pinouts and 8-bit resolution.

Digital Potentiometers FAQ

What is the default wiper position after power-up?

Upon power-up or brown-out reset, both wipers automatically initialize to the mid-scale position (Code 80h).

Can the digital input pins handle voltages higher than VDD?

Yes, the CS, SDI, SCK, and SHDN pins are high-voltage tolerant and can withstand up to 12.5V even if VDD is lower.

Does the device retain its last setting when power is removed?

No, the MCP4251 uses volatile RAM. All wiper settings are lost when power is removed and must be rewritten after each power cycle.