Microchip Technology MCP33111D-05T-E/MS

Overview

MCP33111D-05T-E/MS from Microchip Technology is a 12-bit, 500 kSPS 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 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) for ±VREF differential input range - ideal for high-precision battery-powered motor control and EV battery management systems.

For engineers reviewing the MCP33111D-05T-E/MS datasheet, MCP33111D-05T-E/MS pinout, MCP33111D-05T-E/MS application, or MCP33111D-05T-E/MS equivalent, this page delivers verified electrical specifications, SPI timing constraints (up to 100 MHz SCLK), self-calibration capability, package-specific thermal resistance (68°C/W for TDFN-10), and real-world design implications for automotive-grade data acquisition.

Technical Context

The MCP33111D-05T-E/MS implements a true differential SAR architecture with internal clock generation independent of SPI clock (SCLK), enabling deterministic conversion timing (tACQ = 800 ns, tCNV = 1300 ns at 125°C). Its CNVST-controlled acquisition and conversion sequence eliminates output latency, and the device enters low-power Standby mode between conversions with sampling capacitors connected to inputs.

Self-calibration corrects offset, gain, and linearity errors at power-up and on-demand via SPI command (1024 SCLK cycles required). The 12-bit resolution maintains ±0.12 LSB INL and ±0.06 LSB DNL across temperature, with SNR of 73.9 dBFS and SFDR of 99.3 dBc at fIN = 10 kHz, VREF = 5V - performance validated over the full -40°C to +125°C AEC-Q100 Grade 1 range.

Key Specifications

Pinout & Package

Package: 3 mm × 3 mm Pb-free TDFN-10 (exposed pad), θJA = 68°C/W. MSOP-10 variant also available (θJA = 202°C/W); this part uses TDFN-10 per suffix "-E/MS" (Microchip's standard designation for TDFN-10 with exposed pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7953IRHBT and AD7476ARTZ-REEL7, the MCP33111D-05T-E/MS uniquely combines differential input, on-chip self-calibration, AEC-Q100 qualification, and sub-µA standby current - making it the optimal choice for automotive and portable medical applications demanding both precision and ultra-low power.

Availability

MCP33111D-05T-E/MS is available at Aetrix Electronics and suitable for electric vehicle battery management systems, motor control feedback loops, and portable medical instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MCP33111D-05T-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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP331xxD family targets high-precision, low-power, automotive-qualified data acquisition - designed specifically for applications where differential signaling, wide supply flexibility, and guaranteed performance over temperature are mandatory.

FAQ

What is the maximum SPI clock frequency supported by the MCP33111D-05T-E/MS?

The MCP33111D-05T-E/MS supports SPI SCLK frequencies up to 100 MHz when DVIO ≥ 3.3V (10 ns minimum period). At DVIO = 1.7V, the maximum SCLK drops to 62.5 MHz (16 ns period). These limits ensure reliable setup/hold timing for SDI and valid SDO output within specified quiet time (10 ns) and output enable/disable windows.

Does the MCP33111D-05T-E/MS require an external reference voltage?

Yes, the MCP33111D-05T-E/MS requires an external reference voltage applied to the VREF pin, which must be between 2.5V and 5.1V. This reference sets the full-scale differential input range (±VREF) and directly impacts SNR and THD performance - using 5.1V yields best dynamic range, while 2.5V enables lower-power operation with minor SNR trade-off (73.8 dBFS).

How does the self-calibration feature of the MCP33111D-05T-E/MS work in practice?

The MCP33111D-05T-E/MS performs automatic self-calibration at power-up and supports on-demand recalibration via SPI command (1024 SCLK cycles). During recalibration, the device suspends conversion and adjusts internal DACs to correct offset, gain, and linearity errors - restoring ±0.12 LSB INL even after thermal or reference voltage drift, without requiring host MCU intervention beyond issuing the command.

What is the thermal resistance (θJA) of the MCP33111D-05T-E/MS package?

The MCP33111D-05T-E/MS uses the TDFN-10 package with exposed pad, achieving θJA = 68°C/W under JEDEC JESD51-7 conditions. This is significantly lower than the MSOP-10 variant (202°C/W), enabling higher sustained conversion rates in thermally constrained automotive and industrial environments without active cooling.

Can the MCP33111D-05T-E/MS operate with a 5V digital supply while using a 1.8V analog supply?

Yes, the MCP33111D-05T-E/MS supports DVIO from 1.7V to 5.5V independently of AVDD = 1.8V. This allows direct connection to 5V microcontrollers (e.g., legacy PIC18) without level shifters, while maintaining optimal analog performance - provided DVIO decoupling (0.1 µF ceramic) is implemented and digital noise is prevented from coupling into AVDD or VREF.