Microchip Technology MCP33131D-10-I/MS

Overview

MCP33131D-10-I/MS from Microchip Technology is a 16-bit, 1 Msps fully differential successive approximation register (SAR) analog-to-digital converter with no missing codes, ultra-low standby current (0.8 µA), and AEC-Q100 Grade 1 qualification (-40°C to +125°C). It operates with 1.8V AVDD, 1.7–5.5V DVIO, and 2.5–5.1V external reference, delivering 91.3 dBFS SNR and ±2 LSB INL for high-precision battery management and motor control systems.

For engineers reviewing the MCP33131D-10-I/MS datasheet, MCP33131D-10-I/MS pinout, MCP33131D-10-I/MS application, or MCP33131D-10-I/MS equivalent, this page provides verified electrical specifications, MSOP-10 package details, SPI timing constraints up to 100 MHz, self-calibration behavior, and automotive-grade thermal performance data - all confirmed against DS20005947B.

Technical Context

The MCP33131D-10-I/MS uses a SAR architecture with internal clock generation, decoupling conversion timing from SCLK. Its differential input supports ±VREF full-scale range (up to ±5.1V), and it performs automatic power-up calibration plus on-demand recalibration for offset, gain, and linearity errors.

It enters low-power Standby mode between conversions, where sampling capacitors remain connected to inputs and analog circuitry is shut down. Conversion is triggered by the rising edge of CNVST, and output data is available on SDO after tCNV (max 750 ns), with no latency in data delivery.

Key Specifications

Pinout & Package

Package: MSOP-10 (3 mm × 3 mm, 0.5 mm pitch), Pb-free, RoHS-compliant. Thermal resistance θJA = 202°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.

Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the MCP33131D-10-I/MS uniquely combines differential input, auto-calibration, sub-µA standby, and AEC-Q100 qualification in a 10-pin MSOP - making it optimal for automotive and portable industrial systems where integration, reliability, and power efficiency are co-prioritized.

Availability

MCP33131D-10-I/MS is available at Aetrix Electronics and suitable for electric vehicle battery management systems, industrial motor control platforms, and high-reliability medical instrumentation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MCP33131D-10-I/MS 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 Inc. is a leading provider of microcontrollers, analog, FPGA, and mixed-signal semiconductors, serving automotive, industrial, communications, and consumer markets with vertically integrated design and manufacturing.

The MCP331x1D family was designed specifically for high-accuracy, low-power, automotive-qualified data acquisition in space-constrained environments - emphasizing differential input integrity, self-calibration robustness, and seamless host interoperability via SPI.

FAQ

What is the maximum SPI clock frequency supported by the MCP33131D-10-I/MS?

The MCP33131D-10-I/MS supports an SCLK frequency up to 100 MHz when DVIO ≥ 3.3V, with minimum SCLK period of 10 ns. At lower DVIO levels (e.g., 1.7V), the maximum SCLK drops to 62.5 MHz (16 ns period) to maintain timing margins. This allows high-speed data readout without compromising setup/hold integrity on SDI/SDO lines.

Does the MCP33131D-10-I/MS require an external reference voltage?

Yes, the MCP33131D-10-I/MS requires an external reference voltage applied to the VREF pin, specified from 2.5V to 5.1V. The device does not include an internal reference; instead, it uses VREF to define its full-scale differential input range (±VREF), and draws up to 450 µA from VREF during conversion. A 10 µF tantalum decoupling capacitor is recommended.

How does the CNVST pin function in the MCP33131D-10-I/MS interface?

The CNVST pin serves dual roles: a conversion start trigger and hardware chip select. Its rising edge initiates input sampling; its falling edge enables SDO output and places the device into Standby mode. In 3-wire SPI mode, CNVST replaces the dedicated CS pin - eliminating one host GPIO and simplifying layout while ensuring deterministic timing alignment between sample capture and data availability.

Is the MCP33131D-10-I/MS pin-compatible with other members of the MCP331x1D family?

Yes, the MCP33131D-10-I/MS shares identical pinout and package (MSOP-10 or TDFN-10) with all MCP331x1D-XX variants, including MCP33121D-10-I/MS and MCP33111D-10-I/MS. Resolution and sample rate differ per part number, but PCB layout, decoupling, and interface logic remain unchanged - enabling scalable design reuse across 12-/14-/16-bit requirements.

What thermal considerations apply to the MCP33131D-10-I/MS in MSOP-10 packaging?

In MSOP-10 packaging, the MCP33131D-10-I/MS has a junction-to-ambient thermal resistance (θJA) of 202°C/W. At maximum 1.6 mA conversion current and 1.8V AVDD, power dissipation remains below 3 mW - resulting in negligible self-heating (<0.6°C rise) even in still-air conditions. No heatsink or thermal pad is required for standard automotive or industrial mounting.