Microchip Technology MCP4022T-502E/CH

Overview

MCP4022T-502E/CH from Microchip Technology is a nonvolatile digital rheostat in SOT-23-6 package, offering 64-tap resolution, 5 kΩ nominal resistance (±20%), 75 Ω typical wiper resistance, and WiperLock™ EEPROM write protection. It operates from 2.7V to 5.5V across –40°C to +125°C and is used for precision gain calibration in industrial sensor signal conditioning circuits.

For engineers reviewing the MCP4022T-502E/CH datasheet, MCP4022T-502E/CH pinout, MCP4022T-502E/CH application, or MCP4022T-502E/CH equivalent, key selection criteria include rheostat-mode operation, high-voltage tolerant U/D inputs (up to 12.5V), low-tempco absolute resistance (50 ppm/°C), EEPROM endurance (1 million cycles), and compatibility with low-power embedded control systems requiring stable analog trimming without external memory.

Technical Context

The MCP4022T-502E/CH implements a 6-bit up/down serial interface with no clock or address lines-only CS and U/D pins-enabling minimal GPIO usage. Its internal EEPROM stores the last wiper position, enabling power-on recall without host intervention.

WiperLock™ technology requires a high-voltage (≥8.5V) pulse on U/D during CS low to enable EEPROM writes, preventing accidental overwrites during normal operation. The device supports both potentiometer and rheostat configurations via external terminal wiring, but the MCP4022 variant is factory-configured as a rheostat with terminals A, W, and B active and no NC pin.

Key Specifications

Pinout & Package

SOT-23-6 package with 1.6 mm × 2.8 mm footprint, 0.95 mm height, and standard gull-wing leads. Thermal resistance θ_JA = 230°C/W enables operation at full rating without heatsinking in ambient ≤85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar rheostat applications.

Compared with MCP4022T-103E/CH, the MCP4022T-502E/CH delivers tighter step resolution (78 Ω vs. 159 Ω) for finer current control; compared with MCP4024T-502E/CH, it adds CS-driven multi-drop support at the cost of one extra pin-critical for systems with multiple digital pots sharing a common U/D bus.

Availability

MCP4022T-502E/CH is available at Aetrix Electronics and suitable for industrial sensor calibration, motor current limiting, and programmable power supply trim requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP4022T-502E/CH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a leading provider of microcontrollers, analog components, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon.

The MCP40xx family delivers nonvolatile digital potentiometers optimized for embedded analog trimming-designed to replace mechanical potentiometers in harsh environments while supporting factory calibration and field updates.

FAQ

What is the maximum operating voltage on the U/D and CS pins of the MCP4022T-502E/CH?

The MCP4022T-502E/CH supports high-voltage tolerant digital inputs: U/D and CS pins accept voltages up to 12.5V referenced to VSS, independent of VDD. This enables direct interfacing with 12V control signals and is essential for activating WiperLock™ EEPROM writes, which require ≥8.5V on U/D during CS low. Absolute maximum rating is 12.5V; exceeding this risks permanent damage.

How does the MCP4022T-502E/CH differ from the MCP4021 series in terms of configuration and pinout?

The MCP4022T-502E/CH is a dedicated rheostat with six pins (VSS, U/D, CS, A, W, B) in SOT-23-6, whereas the MCP4021 is a potentiometer in SOIC/MSOP/DFN packages with different pin assignments (e.g., NC instead of B). The MCP4022T-502E/CH lacks an NC pin and exposes all three resistor terminals, enabling true two-terminal rheostat use without floating connections. Its internal logic is optimized for A-W-B current-path operation.

Can the MCP4022T-502E/CH be used in potentiometer mode, or is it strictly a rheostat?

The MCP4022T-502E/CH is functionally capable of potentiometer mode by connecting external circuitry-e.g., tying VSS to terminal B and using A and W as outer and wiper terminals-but its default configuration and characterization data (e.g., VWZSE, VWFSE specs) apply only to rheostat use. Microchip's datasheet confirms floating either A or B enables rheostat mode, implying potentiometer use is possible but not factory-validated for this variant.

What is the typical wiper settling time for the MCP4022T-502E/CH at 5 kΩ load and 100 pF capacitance?

For the MCP4022T-502E/CH configured at 5 kΩ, the typical wiper settling time is 1 µs with a 100 pF capacitive load, as specified in the AC/DC Characteristics table. This value assumes VDD = 5.5V and TA = +25°C. Settling time increases to 2 µs at 10 kΩ and 10 µs at 50 kΩ under identical conditions, reflecting RC time constant dependence on resistance value.

Does the MCP4022T-502E/CH support simultaneous control of multiple devices on a shared U/D bus?

Yes-the MCP4022T-502E/CH supports multi-drop operation via its dedicated CS (chip select) pin. When CS is high, the device ignores U/D transitions; only devices with CS low respond. This allows multiple MCP4022T-502E/CH units to share a single U/D line while being individually addressed, reducing GPIO count in systems requiring several calibrated rheostats.