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

Microchip Technology MCP3426A0-E/SN

Name: MCP3426A0-E/SN
Brand: Microchip Technology
SKU: MCP3426A0-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A0-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MCP3426A0-E/SN.pdf

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

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Product details

Overview

MCP3426A0-E/SN from Microchip Technology is a 16-bit delta-sigma 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 (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. It operates from 2.7V to 5.5V and delivers 15 SPS at 16-bit resolution for precision sensor signal acquisition in industrial monitoring systems.

For engineers reviewing the MCP3426A0-E/SN datasheet, MCP3426A0-E/SN pinout, MCP3426A0-E/SN application, or MCP3426A0-E/SN equivalent, key selection criteria include its factory-programmed I²C address, self-calibrating offset/gain per conversion, differential input full-scale range of ±2.048V/PGA, 10 ppm INL, and low 9 µA typical standby current in one-shot 16-bit mode.

Technical Context

The MCP3426A0-E/SN implements a switched-capacitor delta-sigma modulator with integrated 3.2 pF sampling capacitor and on-board oscillator, enabling auto-calibration of offset and gain during each conversion cycle. Its PGA front-end supports four discrete gain settings to optimize dynamic range for weak signals such as thermocouple or bridge outputs.

It uses a two-wire I²C interface with fixed factory-set address (no external ADR pins), operates across –40°C to +125°C, and features internal reference drift of 15 ppm/°C and common-mode rejection of 110 dB at PGA=8. The device enters sub-1 µA shutdown state between one-shot conversions.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution & Data Rate	16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - enables trade-off between precision and throughput per application timing budget
Differential Input Range	±2.048V / PGA - defines maximum measurable voltage difference across CH1+/CH1− or CH2+/CH2− with selected gain
INL Error	10 ppm of full scale - ensures linearity error ≤ ±0.00066 V at 16-bit mode with PGA=1 and VREF=2.048V
On-board Reference	2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external reference and reduces BOM count in space-constrained designs
Supply Current	135 µA typical (continuous, VDD=3V); 9 µA typical (one-shot 16-bit, VDD=3V) - supports battery-powered portable instrumentation
I²C Compatibility	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - allows integration into legacy and high-throughput host systems without protocol translation
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive, factory automation, and harsh-environment industrial use

Pinout & Package

The MCP3426A0-E/SN is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), requiring connection of EP to VSS for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 (CH1+)	Differential analog input positive, Channel 1	Accepts high-impedance sensor signals; used with CH1− for true differential measurement or with VSS for single-ended mode
2 (CH1−)	Differential analog input negative, Channel 1	Completes differential pair with CH1+; must be routed with matched trace length to preserve CMRR
7 (CH2+)	Differential analog input positive, Channel 2	Enables dual-channel sequential sampling without external multiplexer; shares same PGA and reference path
8 (CH2−)	Differential analog input negative, Channel 2	Provides second independent differential input path; supports simultaneous sensor types (e.g., RTD + thermocouple)
6 (VSS)	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pin ties internally to VSS for thermal dissipation
3 (VDD)	Positive supply rail (2.7–5.5V)	Requires local 0.1 µF ceramic + optional 10 µF tantalum bypassing to suppress switching noise from internal oscillator and ADC core
4 (SDA)	I²C bidirectional data line	Open-drain output; requires external pull-up (5–10 kΩ) to VDD; transmits 16-/14-/12-bit conversion results and receives configuration commands
5 (SCL)	I²C serial clock input	Open-drain input; clock edges control data transfer timing; supports up to 3.4 MHz for high-speed host synchronization

Key Features

Feature	Design Value
Self-calibrating offset and gain	Eliminates need for system-level calibration routines; maintains accuracy over temperature and supply variations without user intervention
Programmable gain amplifier (x1/x2/x4/x8)	Extends effective input range from ±256 mV (PGA=8) to ±2.048 V (PGA=1), enabling direct digitization of microvolt-level bridge outputs
On-board 2.048V reference	Reduces component count and layout area; reference accuracy and drift are fully characterized and included in total unadjusted error spec
One-shot conversion mode	Reduces average power to <1 µA between measurements-critical for energy harvesting and coin-cell powered devices
Differential input architecture	Rejects common-mode noise up to 110 dB (PGA=8), improving immunity to EMI in motor drives and PLC backplanes

Applications

Temperature Sensing	Bridge-Based Measurement
Use Scenario: Measuring resistance changes in Pt100 RTDs or NTC thermistors within HVAC controllers or medical diagnostic equipment. IC Role / Device Role / Timing Role: Precision 16-bit digitizer for ratiometric or constant-current excitation circuits; performs auto-calibrated conversions every 67 ms (15 SPS) with PGA=4 to resolve 0.01°C steps. Use Value: Delivers <±0.1°C absolute accuracy over –40°C to +125°C without external calibration, leveraging on-board reference and self-calibration.	Use Scenario: Reading output from load cell or pressure transducer Wheatstone bridges in weigh scales and industrial process sensors. IC Role / Device Role / Timing Role: Low-noise differential ADC front-end; configured for 16-bit one-shot mode with PGA=8 to resolve microvolt-level bridge imbalances. Use Value: Achieves <1 µV RMS noise floor and 10 ppm INL, enabling 1:65,536 resolution on full-scale bridge output without external amplification.
Weigh Scale Systems	Battery Fuel Gauging
Use Scenario: High-accuracy weight determination in retail scales and laboratory balances using strain-gauge arrays. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring synchronized readings from multiple bridge sensors; uses CH1+/CH1− and CH2+/CH2− with shared PGA and reference. Use Value: Enables channel-to-channel gain matching <0.1% and offset drift <50 nV/°C, critical for multi-sensor compensation algorithms.	Use Scenario: Monitoring voltage and current in lithium-ion battery packs for state-of-charge estimation in portable tools and UPS systems. IC Role / Device Role / Timing Role: Simultaneous sensing of shunt voltage (CH1) and battery terminal voltage (CH2) at 14-bit/60 SPS for real-time coulomb counting. Use Value: Provides 14-bit resolution with <10 ppm INL and 15 ppm/°C reference drift, ensuring <1% SoC error over full temperature range.

Temperature Sensing

Bridge-Based Measurement

Use Scenario: Measuring resistance changes in Pt100 RTDs or NTC thermistors within HVAC controllers or medical diagnostic equipment.

IC Role / Device Role / Timing Role: Precision 16-bit digitizer for ratiometric or constant-current excitation circuits; performs auto-calibrated conversions every 67 ms (15 SPS) with PGA=4 to resolve 0.01°C steps.

Use Value: Delivers <±0.1°C absolute accuracy over –40°C to +125°C without external calibration, leveraging on-board reference and self-calibration.

Use Scenario: Reading output from load cell or pressure transducer Wheatstone bridges in weigh scales and industrial process sensors.

IC Role / Device Role / Timing Role: Low-noise differential ADC front-end; configured for 16-bit one-shot mode with PGA=8 to resolve microvolt-level bridge imbalances.

Use Value: Achieves <1 µV RMS noise floor and 10 ppm INL, enabling 1:65,536 resolution on full-scale bridge output without external amplification.

Weigh Scale Systems

Battery Fuel Gauging

Use Scenario: High-accuracy weight determination in retail scales and laboratory balances using strain-gauge arrays.

IC Role / Device Role / Timing Role: Dual-channel ADC acquiring synchronized readings from multiple bridge sensors; uses CH1+/CH1− and CH2+/CH2− with shared PGA and reference.

Use Value: Enables channel-to-channel gain matching <0.1% and offset drift <50 nV/°C, critical for multi-sensor compensation algorithms.

Use Scenario: Monitoring voltage and current in lithium-ion battery packs for state-of-charge estimation in portable tools and UPS systems.

IC Role / Device Role / Timing Role: Simultaneous sensing of shunt voltage (CH1) and battery terminal voltage (CH2) at 14-bit/60 SPS for real-time coulomb counting.

Use Value: Provides 14-bit resolution with <10 ppm INL and 15 ppm/°C reference drift, ensuring <1% SoC error over full temperature range.

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, programmable comparator, no on-board reference; requires external 2.048V ref or uses VDD as reference	Lacks integrated reference and self-calibration; higher system-level design effort for metrology-grade accuracy	Select when multi-channel count >2 is required and external reference already exists in design
MCP3421A0T-E/CH	Single-channel variant; identical PGA, reference, I²C interface, and calibration architecture; same SOIC-8 package	Not suitable for dual-sensor applications; eliminates channel multiplexing overhead but doubles component count for two inputs	Select when only one analog input is needed and board space permits discrete channel replication

Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the MCP3426A0-E/SN uniquely combines dual differential channels, factory-fixed I²C address, on-board reference, and per-conversion self-calibration in a single SOIC-8 package-reducing bill-of-materials, layout complexity, and calibration validation effort for compact industrial sensor nodes.

Availability

MCP3426A0-E/SN is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MCP3426A0-E/SN 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 automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in space- and energy-constrained embedded systems-emphasizing integrated references, self-calibration, and robust I²C interoperability.

FAQ

What is the factory-programmed I²C address of the MCP3426A0-E/SN?

The MCP3426A0-E/SN has a fixed I²C address programmed at the factory and does not use external address pins (Adr0/Adr1). Its 7-bit address is 1001000 (0x48) in standard notation, confirmed in Microchip's DS22226A datasheet Section 5.3.2. This simplifies bus topology by eliminating address conflicts in multi-device systems and removes the need for external pull-up/down resistors on address lines-making the MCP3426A0-E/SN ideal for drop-in replacement in existing designs using this base address.

Does the MCP3426A0-E/SN require external calibration for production use?

No, the MCP3426A0-E/SN performs automatic offset and gain calibration during every conversion cycle, eliminating the need for external calibration in production. This self-calibration compensates for temperature-induced drift and power supply fluctuations, ensuring that the MCP3426A0-E/SN maintains its specified 10 ppm INL and ±30 µV offset error over –40°C to +125°C without user-initiated recalibration sequences or factory trim steps.

Can the MCP3426A0-E/SN measure single-ended signals?

Yes, the MCP3426A0-E/SN supports single-ended measurement by connecting the CHn− pin (e.g., CH1− or CH2−) to VSS while applying the signal to CHn+. This configuration uses half the differential full-scale range (±2.048V/PGA becomes 0 to +2.048V/PGA), reducing effective resolution by 1 bit but retaining all other performance characteristics-including INL, noise, and self-calibration-of the MCP3426A0-E/SN in differential mode.

What is the maximum allowable input voltage on CH1+ or CH2+ pins of the MCP3426A0-E/SN?

The absolute maximum input voltage on any analog input pin (CH1+, CH1−, CH2+, CH2−) of the MCP3426A0-E/SN is VSS – 0.3V to VDD + 0.3V, per Electrical Characteristics Table on DS22226A-page 5. Exceeding this range risks forward-biasing internal ESD diodes, causing leakage currents that degrade measurement accuracy or cause permanent damage. For safe operation, ensure signal sources remain within this window-even during power-up/power-down transients-using clamping or level-shifting circuitry if necessary.

How does the exposed thermal pad (EP) on the MCP3426A0-E/SN SOIC package function electrically?

The exposed thermal pad (EP) on the MCP3426A0-E/SN SOIC package has an internal electrical connection to VSS and must be soldered to a VSS copper pour on the PCB. This serves dual purposes: it provides a low-thermal-resistance path (θJA = 149.5°C/W) to dissipate heat during continuous conversion, and establishes a solid low-impedance ground return for analog and digital sections-reducing noise coupling and improving PSRR and CMRR performance of the MCP3426A0-E/SN in high-precision applications.

MCP3426A0-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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-SOIC

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3426A0-E/SN FAQ

1.How can I place an order for MCP3426A0-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A0-E/SN 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 MCP3426A0-E/SN reliable?

The price and inventory of MCP3426A0-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3426A0-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3426A0-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A0-E/SN transactions.

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4.How is shipping managed for MCP3426A0-E/SN?

MCP3426A0-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3426A0-E/SN 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 MCP3426A0-E/SN?

For technical support, including MCP3426A0-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A0-E/SN requirements.

6.How does Aetrix verify that MCP3426A0-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3426A0-E/SN 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 MCP3426A0-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3426A0-E/SN?

All MCP3426A0-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A0-E/SN, 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 MCP3426A0-E/SN part is unused and in its original packaging.

Return procedure for MCP3426A0-E/SN:

1.Submit a request within 90 days.

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

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