Microchip Technology MCP33111-05-E/MS

Overview

MCP33111-05-E/MS from Microchip Technology is a 12-bit, 500 kSPS successive approximation register (SAR) analog-to-digital converter with single-ended input, no missing codes, and no latency output. It operates from a 1.8V analog supply (AVDD), supports 1.7V–5.5V digital I/O (DVIO), and accepts 2.5V–5.1V external reference (VREF), enabling precision data acquisition in battery-powered motor control and EV battery management systems.

For engineers reviewing the MCP33111-05-E/MS datasheet, MCP33111-05-E/MS pinout, MCP33111-05-E/MS application, or MCP33111-05-E/MS equivalent, this page delivers verified electrical specs, package mapping to MSOP-10, SPI timing constraints up to 100 MHz, self-calibration behavior, and AEC-Q100 Grade 1 automotive qualification for -40°C to +125°C operation.

Technical Context

The MCP33111-05-E/MS implements a SAR architecture with internal clock generation-decoupling conversion timing from SPI clock (SCLK). Its input acquisition time is 700–800 ns and conversion time is 1200–1300 ns, yielding a fixed 2 µs cycle time at 500 kSPS throughput. The device enters ultra-low-power Standby mode (<0.8 µA) between conversions, with sampling capacitors connected to AIN+ during acquisition.

It features on-demand and automatic power-up self-calibration for offset, gain, and linearity errors. The 10-pin MSOP package supports pseudo-differential input operation but is configured here for single-ended use with full-scale range of 0V to VREF. Reference voltage setting is independent of AVDD and must exceed AVDD.

Key Specifications

Pinout & Package

Package: MSOP-10 (Pb-free, 3 mm × 3 mm, 0.5 mm pitch), thermally optimized for industrial and automotive PCB layouts with θ_JA = 202°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP33111-05-E/MN, the MSOP-10 variant offers easier rework and optical inspection but higher thermal resistance; versus ADS7953IRHBT, it trades channel count and sequencing for lower power, smaller footprint, and simpler interface - ideal for dedicated single-signal monitoring.

Availability

MCP33111-05-E/MS is available at Aetrix Electronics and suitable for motor control feedback, EV battery cell monitoring, portable medical sensors, and industrial switch-mode power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MCP33111-05-E/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 microcontroller, analog, FPGA, and mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The MCP331xx family was designed specifically for high-precision, low-power, automotive-grade data acquisition in space- and energy-constrained systems - emphasizing robustness, ease of integration, and guaranteed performance across extended temperature ranges.

FAQ

What is the maximum SPI clock frequency supported by the MCP33111-05-E/MS?

The MCP33111-05-E/MS supports an SPI clock (SCLK) frequency up to 100 MHz, with timing validated for DVIO ≥3.3V (tSCLK = 10 ns minimum). At lower DVIO voltages (e.g., 1.7V), the maximum SCLK drops to 62.5 MHz. This high-speed interface enables rapid data readout without bottlenecking the 500 kSPS conversion rate of the MCP33111-05-E/MS.

Does the MCP33111-05-E/MS require an external reference voltage?

Yes, the MCP33111-05-E/MS requires an external reference voltage applied to the VREF pin, with a valid range of 2.5V to 5.1V. The device does not include an internal reference; VREF directly defines the full-scale input range (0V to VREF) and critically impacts SNR, INL, and overall measurement accuracy. A 10 µF tantalum decoupling capacitor is required at VREF per the datasheet.

How does the self-calibration feature work on the MCP33111-05-E/MS?

The MCP33111-05-E/MS performs automatic self-calibration at power-up to correct offset, gain, and linearity errors. Users can also trigger recalibration on-demand via a command sent through the SDI pin. Calibration takes 500–650 ms and temporarily halts conversion; it restores optimal performance after environmental shifts such as reference voltage settling anomalies or temperature excursions - ensuring consistent accuracy throughout the MCP33111-05-E/MS lifetime.

Is the MCP33111-05-E/MS pin-compatible with other devices in the MCP331xx family?

Yes, all MCP331xx-XX variants (including MCP33111-05-E/MS, MCP33121-05-E/MS, and MCP33131-05-E/MS) share identical pinouts and package footprints for both MSOP-10 and TDFN-10. This allows direct resolution upgrades (e.g., from 12-bit to 16-bit) without PCB layout changes - provided DVIO, AVDD, and VREF conditions remain compatible with the target device's specifications.

What is the standby current consumption of the MCP33111-05-E/MS?

The MCP33111-05-E/MS consumes just 0.8 µA typical during Standby mode - the low-power state entered after conversion completion, where sampling capacitors remain connected to AIN+ and most internal analog circuitry is shut down. This ultra-low quiescent current makes the MCP33111-05-E/MS especially suitable for battery-powered instrumentation and always-on sensor nodes requiring multi-year operational life.