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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Microchip Technology MCP33121-05T-E/MS

Name: MCP33121-05T-E/MS
Brand: Microchip Technology
SKU: MCP33121-05T-E/MS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP33121-05T-E/MS

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP33121-05T-E/MS.pdf

Description:: IC ADC 14BIT SAR 10MSOP

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Product details

Overview

MCP33121-05T-E/MS from Microchip Technology is a 14-bit, 500 kSPS single-ended 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), enabling high-precision data acquisition in battery-powered motor control and EV battery management systems.

For engineers reviewing the MCP33121-05T-E/MS datasheet, MCP33121-05T-E/MS pinout, MCP33121-05T-E/MS application, or MCP33121-05T-E/MS equivalent, this page delivers verified specifications, MSOP-10 package details, SPI timing constraints (up to 100 MHz SCLK), self-calibration behavior, and validated automotive-grade alternatives - all aligned to DS20006122A.

Technical Context

The MCP33121-05T-E/MS implements a successive approximation register (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 across temperature, yielding a fixed 2 µs cycle time at 500 kSPS throughput.

It features pseudo-differential input operation with single-ended configuration (0V to +VREF full-scale range), on-demand and automatic power-up self-calibration for offset/gain/linearity, and Schmitt-trigger digital inputs compatible with 1.7V–5.5V DVIO - eliminating level shifters when interfacing with PIC32MZ or other industrial microcontrollers.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	14-bit with no missing codes - guarantees monotonicity and deterministic code transitions for closed-loop control feedback.
Sample Rate	500 kSPS - enables real-time sampling of 200 kHz bandwidth signals (per Nyquist) in motor phase current sensing.
SNR / SFDR	83.5 dBFS / 98.8 dBc at fIN = 10 kHz, VREF = 5.1V - supports >12 ENOB in high-dynamic-range sensor interfaces.
INL / DNL	±0.55 LSB / ±0.25 LSB - ensures sub-LSB linearity critical for precision voltage monitoring in BMS cell balancing.
Supply Voltages	AVDD = 1.8V, DVIO = 1.7–5.5V, VREF = 2.5–5.1V - allows independent rail optimization: low-noise analog domain + flexible host interface.
Current Consumption	1.4 mA during conversion, 0.8 µA in standby - extends battery life in portable test equipment and IoT edge nodes.
Temperature Range	–40°C to +125°C (AEC-Q100 Grade 1) - qualified for under-hood automotive and industrial power electronics environments.

Pinout & Package

Package: MSOP-10 (3.0 mm × 4.9 mm, 0.5 mm pitch), Pb-free, RoHS-compliant, thermal resistance θJA = 202°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1: AIN+	Analog Input (non-inverting)	Single-ended input node; referenced to GND; full-scale range = 0V to VREF.
2: AVDD	Analog Supply	1.8V regulated supply for SAR core and reference buffer; requires 1 µF ceramic decoupling.
3: AIN−	Analog Input (inverting)	Internally connected to GND in single-ended mode; must be tied to GND per datasheet.
4: SDI	SPI Data Input	Command/data input (e.g., recalibrate command); Schmitt-triggered, DVIO-referenced logic.
5: SCLK	SPI Clock Input	Up to 100 MHz; timing-critical for data capture; min pulse width 3 ns (DVIO ≥ 2.3V).
6: GND	Analog/Digital Ground	Common reference for AVDD, DVIO, and analog inputs; star grounding recommended.
7: SDO	SPI Data Output	Tri-state output; presents 14-bit result MSB-first after CNVST falling edge; 9.5 ns valid delay (DVIO ≥ 3.3V).
8: DVIO	Digital I/O Supply	1.7–5.5V logic interface supply; powers SDI/SDO/SCLK/CNVST buffers; requires 0.1 µF decoupling.
9: VREF	External Reference Input	2.5–5.1V precision reference; supplies ADC core; requires 10 µF tantalum decoupling.
10: CNVST	Convert Start Input	Edge-triggered (rising edge initiates conversion); also functions as chip select in 3-wire SPI mode.

Key Features

Feature	Design Value
No latency output	Conversion result available immediately after CNVST falling edge - eliminates pipeline delay in real-time control loops.
Self-calibration	Automatic on power-up and user-commanded recalibration (1024 SCLK clocks) corrects offset/gain/INL drift over temperature and VREF variation.
Wide DVIO range	1.7V–5.5V digital interface supports direct connection to 1.8V, 3.3V, or 5V MCUs without level-shifting circuitry.
Ultra-low standby current	0.8 µA typical standby current enables >10-year battery life in always-on sensor nodes and portable diagnostics tools.
AEC-Q100 Grade 1	Qualified for automotive applications including battery management and motor control - validated across –40°C to +125°C ambient.

Applications

Motor Control Feedback	EV Battery Cell Monitoring
Use Scenario: Real-time sampling of phase current and DC-link voltage in 3-phase inverter drives. IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing fast transients during PWM switching; synchronized via CNVST edge. Use Value: 500 kSPS throughput and 83.5 dB SNR enable accurate current reconstruction and torque ripple reduction.	Use Scenario: Precision voltage measurement of individual Li-ion cells in 400V+ traction battery packs. IC Role / Device Role / Timing Role: Single-ended ADC with 2.5V–5.1V VREF flexibility, interfacing to isolated voltage dividers and multiplexers. Use Value: ±0.55 LSB INL and AEC-Q100 qualification ensure reliable cell voltage accuracy over lifetime and temperature.
Industrial Test Equipment	Medical Sensor Signal Chain
Use Scenario: Portable multimeter or handheld oscilloscope front-end requiring high resolution and low power. IC Role / Device Role / Timing Role: 14-bit SAR ADC with no missing codes and 0.8 µA standby current enabling long battery runtime. Use Value: 98.8 dB SFDR and 500 kSPS support harmonic analysis up to 200 kHz without aliasing.	Use Scenario: ECG/EEG front-end signal digitization where low noise and DC accuracy are critical. IC Role / Device Role / Timing Role: Low-drift ADC with self-calibration maintaining baseline stability across patient temperature variations. Use Value: Offset error drift <±0.8 µV/°C and gain error drift <±0.35 µV/°C minimize calibration frequency in clinical devices.

Motor Control Feedback

EV Battery Cell Monitoring

Use Scenario: Real-time sampling of phase current and DC-link voltage in 3-phase inverter drives.

IC Role / Device Role / Timing Role: High-speed, low-latency ADC capturing fast transients during PWM switching; synchronized via CNVST edge.

Use Value: 500 kSPS throughput and 83.5 dB SNR enable accurate current reconstruction and torque ripple reduction.

Use Scenario: Precision voltage measurement of individual Li-ion cells in 400V+ traction battery packs.

IC Role / Device Role / Timing Role: Single-ended ADC with 2.5V–5.1V VREF flexibility, interfacing to isolated voltage dividers and multiplexers.

Use Value: ±0.55 LSB INL and AEC-Q100 qualification ensure reliable cell voltage accuracy over lifetime and temperature.

Industrial Test Equipment

Medical Sensor Signal Chain

Use Scenario: Portable multimeter or handheld oscilloscope front-end requiring high resolution and low power.

IC Role / Device Role / Timing Role: 14-bit SAR ADC with no missing codes and 0.8 µA standby current enabling long battery runtime.

Use Value: 98.8 dB SFDR and 500 kSPS support harmonic analysis up to 200 kHz without aliasing.

Use Scenario: ECG/EEG front-end signal digitization where low noise and DC accuracy are critical.

IC Role / Device Role / Timing Role: Low-drift ADC with self-calibration maintaining baseline stability across patient temperature variations.

Use Value: Offset error drift <±0.8 µV/°C and gain error drift <±0.35 µV/°C minimize calibration frequency in clinical devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS8860IDRCT	16-bit, 1 MSPS, SPI, 1.8V AVDD, but requires external reference and lacks integrated self-calibration.	Higher resolution for metrology; unsuitable for automotive due to non-AEC-Q100 qualification.	Select when absolute 16-bit linearity is required and recalibration can be handled externally.
MCP33121D-05T-E/MN	Same electrical specs, but TDFN-10 (3×3 mm) package with θJA = 68°C/W - superior thermal performance in space-constrained PCBs.	Better suited for high-density power modules where MSOP-10 thermal resistance (202°C/W) may limit sustained throughput.	Choose for thermally demanding motor drive gate driver boards or compact BMS modules.

Compared with ADS8860IDRCT, MCP33121-05T-E/MS offers automotive qualification and autonomous calibration at 14-bit resolution; compared with MCP33121D-05T-E/MN, it trades thermal efficiency for legacy MSOP-10 footprint compatibility in existing designs.

Availability

MCP33121-05T-E/MS is available at Aetrix Electronics and suitable for motor control feedback, EV battery cell monitoring, and industrial test equipment requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for MCP33121-05T-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, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software.

The MCP331xx family targets high-accuracy, low-power, automotive-grade data acquisition - designed specifically for real-time control systems needing no-latency conversion, wide supply flexibility, and robust operation across extended temperature ranges.

FAQ

What is the maximum SPI clock rate supported by the MCP33121-05T-E/MS?

The MCP33121-05T-E/MS supports an SCLK frequency up to 100 MHz, with minimum pulse widths of 3 ns (low/high) for DVIO ≥ 2.3V. At lower DVIO (≥1.7V), max SCLK drops to 62.5 MHz. This high-speed interface enables rapid data readout without bottlenecking the 500 kSPS conversion rate of the MCP33121-05T-E/MS.

Does the MCP33121-05T-E/MS require an external reference voltage?

Yes, the MCP33121-05T-E/MS requires an external reference voltage applied to the VREF pin, with a specified range of 2.5V to 5.1V. The device does not include an internal reference; VREF directly sets the full-scale input range (0V to +VREF), and its stability directly impacts ADC accuracy. A 10 µF tantalum capacitor is required at VREF for noise suppression.

How does the self-calibration function work in the MCP33121-05T-E/MS?

The MCP33121-05T-E/MS performs automatic self-calibration on power-up to correct offset, gain, and linearity errors. Users can also trigger recalibration on-demand via a dedicated SPI command requiring 1024 SCLK cycles. Calibration takes 500–650 ms and restores optimal performance after environmental shifts - such as VREF settling issues or temperature excursions - ensuring consistent accuracy throughout the MCP33121-05T-E/MS operational life.

Is the MCP33121-05T-E/MS pin-compatible with other members of the MCP331xx family?

Yes, the MCP33121-05T-E/MS shares identical pinout and package (MSOP-10) with all MCP331xx-05 and MCP331xx-10 variants, including MCP33131-05T-E/MS and MCP33111-05T-E/MS. This allows drop-in resolution upgrades (12/14/16-bit) or sample rate changes (500 kSPS/1 MSPS) without PCB redesign - provided DVIO, VREF, and timing constraints remain within spec for the selected variant.

What is the input full-scale range of the MCP33121-05T-E/MS?

The MCP33121-05T-E/MS has a single-ended input full-scale range of 0V to +VREF, where VREF is externally supplied between 2.5V and 5.1V. The analog input pins (AIN+, AIN−) accept voltages from –0.1V to VREF + 0.1V, but valid conversion occurs only within 0V to VREF. AIN− must be tied to GND in single-ended mode, as confirmed in the device's functional description and application diagram.

MCP33121-05T-E/MS Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 14

Sampling Rate (Per Second):: 500k

Number of Inputs:: 1

Input Type:: Single Ended

Data Interface:: SPI

Configuration:: ADC

Ratio - S/H:ADC:: 0:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External

Voltage - Supply, Analog:: 1.7V ~ 1.9V

Voltage - Supply, Digital:: 1.7V ~ 5.5V

Features:: -

Operating Temperature:: -40°C ~ 125°C

Supplier Device Package:: 10-MSOP

Mounting Type:: Surface Mount

Grade:: Automotive

Qualification:: AEC-Q100

MCP33121-05T-E/MS FAQ

1.How can I place an order for MCP33121-05T-E/MS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP33121-05T-E/MS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MCP33121-05T-E/MS reliable?

The price and inventory of MCP33121-05T-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP33121-05T-E/MS is usually 5 days.

3.What payment methods are accepted for MCP33121-05T-E/MS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP33121-05T-E/MS transactions.

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4.How is shipping managed for MCP33121-05T-E/MS?

MCP33121-05T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP33121-05T-E/MS order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MCP33121-05T-E/MS?

For technical support, including MCP33121-05T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP33121-05T-E/MS requirements.

6.How does Aetrix verify that MCP33121-05T-E/MS is sourced from the original manufacturer or authorized distributors?

All MCP33121-05T-E/MS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP33121-05T-E/MS meets industry standards.

7.What is the process for return or replacement of MCP33121-05T-E/MS?

All MCP33121-05T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP33121-05T-E/MS, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MCP33121-05T-E/MS part is unused and in its original packaging.

Return procedure for MCP33121-05T-E/MS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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