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

Microchip Technology MCP3426A2-E/MC

Name: MCP3426A2-E/MC
Brand: Microchip Technology
SKU: MCP3426A2-E/MC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A2-E/MC

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP3426A2-E/MC.pdf

Description:: IC ADC 16BIT SIGMA-DELTA 8DFN

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Product details

Overview

MCP3426A2-E/MC from Microchip Technology is a 16-bit ΔΣ analog-to-digital converter with two differential input channels, on-board 2.048V ±0.05% voltage reference, programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting standard/fast/high-speed modes. It delivers 15 SPS at 16-bit resolution, 10 ppm INL, and operates from 2.7V to 5.5V supply across –40°C to +125°C - used in precision RTD/thermistor temperature sensing and bridge-based pressure transducers.

For engineers reviewing the MCP3426A2-E/MC datasheet, MCP3426A2-E/MC pinout, MCP3426A2-E/MC application, or MCP3426A2-E/MC equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (one-shot/continuous), calibrated performance data (INL, noise, drift), and real-world design implications for low-power industrial sensor interfaces.

Technical Context

The MCP3426A2-E/MC implements a delta-sigma modulator with integrated 3.2 pF sampling capacitor, on-chip oscillator, and auto-calibrating offset/gain correction per conversion. Its switched-capacitor front end requires source impedance ≤100 Ω for <10 ppm INL error under 16-bit operation.

It uses a 2.048V internal reference to define ±2.048V differential full-scale range (FSR = 4.096V/PGA), enabling 12-bit (240 SPS), 14-bit (60 SPS), or 16-bit (15 SPS) output formats via I²C-configurable resolution bits. The device supports only Channel 1 and Channel 2 selection - no Adr0/Adr1 pins - as factory-programmed I²C address eliminates external address configuration.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution & Data Rate	16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - defines trade-off between noise floor (2.5 µV_RMS) and update latency
Differential Input Range	±2.048V / PGA - sets max measurable signal before saturation; e.g., ±256 mV at PGA=8
Integral Non-Linearity	10 ppm of FSR - ensures <±0.00066% full-scale error across temperature without calibration
On-Board Reference	2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external reference and reduces BOM count
Supply Current	135 µA typical (3V, continuous); 0.56 µA typical (12-bit one-shot) - enables battery-powered sensor nodes with multi-year life
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial control environments
I²C Interface Modes	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports legacy and high-throughput host microcontrollers

Pinout & Package

The MCP3426A2-E/MC is packaged in an 8-pin SOIC (MCP3426 functional block diagram, DS22226A-page 2). Pin assignments are validated per Table 3-1 and functional diagrams in Microchip DS22226A.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Positive differential analog input for Channel 1	Accepts voltage up to VDD+0.3V; paired with CH1− for true differential measurement
CH1−	Negative differential analog input for Channel 1	Can be tied to VSS for single-ended mode; forms 3.2 pF switched-capacitor input node
CH2+	Positive differential analog input for Channel 2	Independent channel path; shares same PGA and reference as CH1
CH2−	Negative differential analog input for Channel 2	Enables dual-sensor monitoring (e.g., temperature + pressure) without multiplexer switching delay
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; internally tied to EP thermal pad
VDD	Power supply (2.7V–5.5V)	Requires 0.1 µF ceramic + 10 µF tantalum bypassing; powers all analog and digital circuitry
SDA	I²C bidirectional data line	Open-drain output; needs 5–10 kΩ pull-up to VDD for standard/fast mode
SCL	I²C serial clock input	Open-drain input; clock edges control data transfer timing; must be driven by master

Key Features

Feature	Design Value
Self-calibrating offset & gain	Per-conversion correction eliminates system-level calibration routines and maintains accuracy over –40°C to +125°C
Programmable gain amplifier (x1/x2/x4/x8)	Enables direct digitization of µV-level thermocouple outputs or mV-level strain gauge bridges without external op-amps
On-board 2.048V reference (±0.05%)	Removes dependency on external reference ICs, reducing layout sensitivity and long-term drift contributors
One-shot conversion mode	Reduces average current to 0.56 µA (12-bit) or 9 µA (16-bit), ideal for wake-on-event sensor polling
Differential input architecture	Rejects common-mode noise >105 dB (DC, PGA=1), critical for noisy industrial 4–20 mA loop environments

Applications

RTD-Based Temperature Monitoring	Strain Gauge Load Cell Interface
Use Scenario: Measuring platinum RTD (PT100/PT1000) resistance in HVAC controllers with 0.1°C resolution over –40°C to +125°C. IC Role / Device Role / Timing Role: ADC front-end converting ratiometric RTD voltage (excited by stable current source) into 16-bit digital code via differential CH1+/CH1− inputs. Use Value: 10 ppm INL and 2.5 µV_RMS noise enable <±0.05°C absolute accuracy without software linearization or external trimming.	Use Scenario: Reading full-bridge strain gauges in industrial weigh scales where excitation voltage varies ±5% and ambient temperature swings ±80°C. IC Role / Device Role / Timing Role: Precision digitizer for bridge output using CH2+/CH2−, leveraging on-board PGA to match gauge sensitivity (2–10 mV/V). Use Value: Auto-calibration per conversion compensates for thermal drift in bridge and amplifier, maintaining <0.02% FS repeatability.
Thermocouple Cold-Junction Compensation	Battery Fuel Gauge for Li-ion Packs
Use Scenario: K-type thermocouple measurement in furnace controls requiring cold-junction compensation via onboard temperature sensor (external). IC Role / Device Role / Timing Role: Dual-channel acquisition: CH1 reads thermocouple EMF, CH2 reads RTD-based cold-junction temperature - both synchronized via I²C. Use Value: Simultaneous 16-bit sampling eliminates time-skew errors; 15 ppm/°C reference drift ensures <±1.5°C total error over full range.	Use Scenario: Monitoring cell voltage and pack current in portable medical devices using shunt-based current sensing and direct cell voltage taps. IC Role / Device Role / Timing Role: Low-power ADC acquiring shunt voltage (CH1−/CH1+) and cell voltage (CH2+/CH2−) in one-shot mode during sleep intervals. Use Value: 0.56 µA standby current extends battery life; ±2.048V FSR matches typical Li-ion cell range (2.5–4.2V) when scaled with resistor divider.

RTD-Based Temperature Monitoring

Strain Gauge Load Cell Interface

Use Scenario: Measuring platinum RTD (PT100/PT1000) resistance in HVAC controllers with 0.1°C resolution over –40°C to +125°C.

IC Role / Device Role / Timing Role: ADC front-end converting ratiometric RTD voltage (excited by stable current source) into 16-bit digital code via differential CH1+/CH1− inputs.

Use Value: 10 ppm INL and 2.5 µV_RMS noise enable <±0.05°C absolute accuracy without software linearization or external trimming.

Use Scenario: Reading full-bridge strain gauges in industrial weigh scales where excitation voltage varies ±5% and ambient temperature swings ±80°C.

IC Role / Device Role / Timing Role: Precision digitizer for bridge output using CH2+/CH2−, leveraging on-board PGA to match gauge sensitivity (2–10 mV/V).

Use Value: Auto-calibration per conversion compensates for thermal drift in bridge and amplifier, maintaining <0.02% FS repeatability.

Thermocouple Cold-Junction Compensation

Battery Fuel Gauge for Li-ion Packs

Use Scenario: K-type thermocouple measurement in furnace controls requiring cold-junction compensation via onboard temperature sensor (external).

IC Role / Device Role / Timing Role: Dual-channel acquisition: CH1 reads thermocouple EMF, CH2 reads RTD-based cold-junction temperature - both synchronized via I²C.

Use Value: Simultaneous 16-bit sampling eliminates time-skew errors; 15 ppm/°C reference drift ensures <±1.5°C total error over full range.

Use Scenario: Monitoring cell voltage and pack current in portable medical devices using shunt-based current sensing and direct cell voltage taps.

IC Role / Device Role / Timing Role: Low-power ADC acquiring shunt voltage (CH1−/CH1+) and cell voltage (CH2+/CH2−) in one-shot mode during sleep intervals.

Use Value: 0.56 µA standby current extends battery life; ±2.048V FSR matches typical Li-ion cell range (2.5–4.2V) when scaled with resistor divider.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit delta-sigma ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS1115IDGSR	4-channel, 16-bit, 860 SPS max; no on-board reference; requires external 2.048V ref or use of VDD as reference	Higher speed but lower noise floor (150 nV_RMS vs. 2.5 µV_RMS); lacks auto-calibration - demands system-level calibration	Select when higher throughput (>100 SPS) is required and board space allows external reference + calibration firmware
MCP3421A0-E/MS	Single-channel, 18-bit, 15 SPS; identical PGA, reference, and I²C interface; same SOIC-8 package footprint	Higher resolution but no second channel; not suitable for dual-sensor systems requiring simultaneous sampling	Select when only one high-precision channel is needed and 18-bit resolution outweighs dual-channel requirement

Compared with ADS1115IDGSR and MCP3421A0-E/MS, the MCP3426A2-E/MC uniquely balances dual-channel capability, on-board reference, per-conversion calibration, and ultra-low power - making it optimal for space-constrained, self-calibrating industrial sensor nodes where channel count and long-term stability are prioritized over raw speed or bit depth.

Availability

MCP3426A2-E/MC is available at Aetrix Electronics and suitable for RTD temperature monitoring, strain gauge load cells, thermocouple interfaces, and battery fuel gauging requiring stable component supply across automotive, industrial automation, and medical device production cycles.

Supply support for MCP3426A2-E/MC 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 components, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in harsh environments - emphasizing integrated references, self-calibration, and robust I²C communication for embedded measurement systems.

FAQ

What is the factory-programmed I²C address of the MCP3426A2-E/MC?

The MCP3426A2-E/MC has its I²C address permanently programmed during manufacturing - unlike MCP3427/3428, it does not use Adr0/Adr1 pins. The default 7-bit address is 0x68 (1101000b), with the A2 bit set to logic high per the "A2" suffix in the part number. This fixed address simplifies bus topology in single-ADC designs but requires address collision management in multi-device systems.

Does the MCP3426A2-E/MC support single-ended input configurations?

Yes, the MCP3426A2-E/MC supports single-ended operation: CH1− or CH2− can be tied to VSS, allowing CH1+ or CH2+ to measure voltage relative to ground. However, this sacrifices common-mode rejection and increases susceptibility to noise - differential mode is strongly recommended for <10 ppm INL performance. The input structure remains switched-capacitor regardless of mode.

How does the self-calibration function impact conversion timing for the MCP3426A2-E/MC?

Each conversion cycle of the MCP3426A2-E/MC includes automatic offset and gain calibration, extending total conversion time beyond raw sampling duration. At 16-bit resolution (15 SPS), the full cycle - including calibration - takes ~66.7 ms. This ensures measurement integrity across temperature and supply variations but precludes sub-15 Hz deterministic timing without buffering.

What is the maximum allowable source impedance for CH1+/CH1− inputs to maintain 10 ppm INL on the MCP3426A2-E/MC?

To maintain ≤10 ppm INL at 16-bit resolution, the total source impedance (including sensor, filter, and PCB trace) seen at CH1+/CH1− must be ≤100 Ω when PGA = 1. Higher PGA settings reduce effective impedance limit proportionally (e.g., ≤25 Ω at PGA = 4). Exceeding this causes incomplete charging of the 3.2 pF internal sampling capacitor, introducing gain and linearity errors.

Can the MCP3426A2-E/MC operate reliably at 5.5V supply while maintaining specified 16-bit performance?

Yes, the MCP3426A2-E/MC is fully specified from 2.7V to 5.5V. At VDD = 5.5V, supply current rises to 180 µA (typical, continuous mode), and gain error drift remains within 15 ppm/°C. All electrical characteristics - including INL, noise, and reference accuracy - are guaranteed across the full voltage range per DS22226A Electrical Characteristics table (page 5).

MCP3426A2-E/MC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

Packaging:: Tube

Product Status:: Active

Number of Bits:: 16

Sampling Rate (Per Second):: 15

Number of Inputs:: 2

Input Type:: Differential

Data Interface:: I2C

Configuration:: MUX-PGA-ADC

Ratio - S/H:ADC:: -

Number of A/D Converters:: 1

Architecture:: Sigma-Delta

Reference Type:: Internal

Voltage - Supply, Analog:: 2.7V ~ 5.5V

Voltage - Supply, Digital:: 2.7V ~ 5.5V

Features:: PGA

Operating Temperature:: -40°C ~ 125°C

Supplier Device Package:: 8-DFN (2x3)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3426A2-E/MC FAQ

1.How can I place an order for MCP3426A2-E/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A2-E/MC 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 MCP3426A2-E/MC reliable?

The price and inventory of MCP3426A2-E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3426A2-E/MC is usually 5 days.

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Once your MCP3426A2-E/MC 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 MCP3426A2-E/MC?

For technical support, including MCP3426A2-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A2-E/MC requirements.

6.How does Aetrix verify that MCP3426A2-E/MC is sourced from the original manufacturer or authorized distributors?

All MCP3426A2-E/MC 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 MCP3426A2-E/MC meets industry standards.

7.What is the process for return or replacement of MCP3426A2-E/MC?

All MCP3426A2-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A2-E/MC, 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 MCP3426A2-E/MC part is unused and in its original packaging.

Return procedure for MCP3426A2-E/MC:

1.Submit a request within 90 days.

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

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