Microchip Technology MCP4361T-503E/ST

Overview

MCP4361T-503E/ST from Microchip Technology is a 8-bit quad digital potentiometer with non-volatile EEPROM, 50 kΩ end-to-end resistance, TSSOP-20 package, and SPI interface operating up to 10 MHz. It delivers precise analog voltage/current control in programmable gain stages, sensor calibration circuits, and power supply feedback loops across industrial temperature range (–40°C to +125°C).

For engineers reviewing the MCP4361T-503E/ST datasheet, MCP4361T-503E/ST pinout, MCP4361T-503E/ST application, or MCP4361T-503E/ST equivalent, key selection criteria include wiper lock capability, 75 Ω typical wiper resistance, 15 ppm/°C ratiometric tempco, EEPROM endurance (1 million cycles), and terminal disconnect via TCON register.

Technical Context

The MCP4361T-503E/ST integrates four independent 257-tap resistor networks, each configurable as potentiometer or rheostat. Its SPI interface supports modes 0,0 and 1,1 at up to 10 MHz (VDD ≥ 2.7 V), with hardware/software write protection and automatic recall of non-volatile wiper settings on power-up.

Each resistor network features low 75 Ω typical wiper resistance, absolute tempco of 50 ppm/°C (0°C to 70°C), and ratiometric tempco of 15 ppm/°C at mid-scale. The device includes brown-out reset (1.5 V typical), high-voltage tolerant inputs (up to 12.5 V), and internal weak pull-ups on all digital pins.

Key Specifications

Pinout & Package

TSSOP-20 package with 0.65 mm pitch, exposed pad (EP) for thermal enhancement; 20-pin surface-mount layout optimized for high-density PCBs and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP4361T-503E/ST, the QFN variant offers superior thermal dissipation for sustained wiper activity, while the MCP4362T-503E/ST simplifies routing in rheostat-only designs but forfeits potentiometer flexibility and terminal disconnect capability.

Availability

MCP4361T-503E/ST is available at Aetrix Electronics and suitable for programmable power supplies, sensor calibration systems, and industrial motor control interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP4361T-503E/ST 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 interface ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP43xx/436x family was designed specifically for precision analog trimming and programmable resistance in harsh-environment applications, emphasizing non-volatility, wide temperature operation, and robust digital interface reliability.

FAQ

What is the wiper resistance specification for MCP4361T-503E/ST?

The MCP4361T-503E/ST has a typical wiper resistance of 75 Ω at VDD = 5.5 V and IW = 2.0 mA (code = 00h), with a maximum of 300 Ω at VDD = 2.7 V. This low resistance ensures minimal insertion error in voltage divider and gain-setting configurations, especially critical in high-precision op-amp feedback networks where wiper impedance directly impacts transfer function accuracy.

Does MCP4361T-503E/ST support both potentiometer and rheostat configurations?

Yes, MCP4361T-503E/ST supports both configurations per channel. In potentiometer mode, terminals A, W, and B are used for three-terminal voltage division. In rheostat mode, either A or B is floated, leaving W and the remaining terminal as a two-terminal variable resistor. The TCON register enables dynamic terminal disconnect, allowing safe reconfiguration without power cycling the MCP4361T-503E/ST.

How does the non-volatile memory in MCP4361T-503E/ST operate during power-up?

On power-up or brown-out reset, MCP4361T-503E/ST automatically loads the last stored wiper values from EEPROM into volatile registers, restoring pre-power-loss settings within 20 µs. This recall behavior eliminates boot-time calibration routines and ensures immediate functional readiness - a key requirement in safety-critical or always-on systems using the MCP4361T-503E/ST.

What SPI modes and maximum clock frequency does MCP4361T-503E/ST support?

MCP4361T-503E/ST supports SPI modes 0,0 and 1,1 with a maximum SCK frequency of 10 MHz at VDD ≥ 2.7 V. At lower supply voltages (1.8–2.7 V), the maximum clock rate drops to 1 MHz. The device features fast read/write timing - including 70 ns SDO valid delay after SCK↓ - enabling high-throughput wiper updates in real-time control loops using the MCP4361T-503E/ST.

Can MCP4361T-503E/ST operate with mixed voltage domains (e.g., 5 V analog, 3.3 V digital)?

Yes, MCP4361T-503E/ST supports split-rail operation: its digital inputs tolerate up to 12.5 V regardless of VDD, and resistor terminals (PxA, PxW, PxB) accept voltages from VSS to VDD. This allows direct interfacing with 5 V analog signals while using a 3.3 V MCU for SPI control - a common architecture in mixed-signal systems leveraging the MCP4361T-503E/ST for flexible analog tuning.