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

Microchip Technology MCP3426A0-E/MS

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

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Part No.:: MCP3426A0-E/MS

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP3426A0-E/MS.pdf

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

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Product details

Overview

MCP3426A0-E/MS 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 10 ppm INL, 15 SPS at 16-bit resolution, and operates from 2.7V to 5.5V over –40°C to +125°C for precision sensor signal acquisition in industrial and portable instrumentation.

For engineers reviewing the MCP3426A0-E/MS datasheet, MCP3426A0-E/MS pinout, MCP3426A0-E/MS application, or MCP3426A0-E/MS equivalent, key selection criteria include differential input channel count, self-calibrating offset/gain per conversion, PGA-configurable full-scale range (±2.048V/PGA), low standby current (0.56 µA at 12-bit one-shot), and MSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MCP3426A0-E/MS implements a delta-sigma modulator with integrated 3.2 pF sampling capacitor, on-chip oscillator, and sinc filter for anti-aliasing. Its switched-capacitor front-end requires careful source impedance management (<1 kΩ recommended) to avoid INL degradation during charge settling.

Each conversion triggers automatic offset and gain calibration using the internal 2.048V reference, ensuring stability across temperature (±50 nV/°C offset drift) and supply variation (5 ppm/V gain vs. VDD). The I²C interface uses open-drain SDA/SCL pins with 5–10 kΩ pull-ups and supports user-defined address configuration only in MCP3427/3428 variants - the MCP3426A0-E/MS has factory-programmed I²C address.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit (15 SPS), 14-bit (60 SPS), or 12-bit (240 SPS) - selectable per conversion; no missing codes guaranteed.
Differential Input Range	±2.048V / PGA - full-scale range scales inversely with PGA gain (e.g., ±256 mV at x8).
INL Error	10 ppm of full-scale range - ensures ≤±0.66 LSB error at 16-bit resolution for high-accuracy measurements.
Supply Current	135 µA typical (3V, continuous); 0.56 µA typical (12-bit one-shot) - enables battery-powered operation with ultra-low idle power.
Reference Accuracy	2.048V ±0.05% (±1.024 mV) - eliminates need for external reference in most precision applications.
Operating Temp	–40°C to +125°C - qualified for automotive under-hood and industrial control environments.
I²C Modes	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration.

Pinout & Package

The MCP3426A0-E/MS is housed in an 8-pin MSOP package (3.0 × 4.9 mm, 0.65 mm pitch) with exposed thermal pad (EP) internally connected to VSS and requiring PCB connection to ground plane for thermal and noise performance.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Differential analog input, channel 1 positive	Accepts signal up to VDD+0.3V; used with CH1– for true differential measurement or referenced to VSS for single-ended mode.
CH1–	Differential analog input, channel 1 negative	Common-mode voltage must stay within VSS–0.3V to VDD+0.3V; forms 3.2 pF switched-capacitor input node with CH1+.
CH2+	Differential analog input, channel 2 positive	Independent second channel; identical electrical specs to CH1+; supports multiplexed sequential conversion.
CH2–	Differential analog input, channel 2 negative	Paired with CH2+; shares same PGA, reference, and ADC core as CH1 inputs.
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pad ties internally to VSS and requires soldered PCB connection.
VDD	Positive supply rail	2.7–5.5V operation; requires 0.1 µF ceramic + 10 µF tantalum bypass capacitors placed near pin.
SDA	I²C bidirectional data line	Open-drain output/input; needs external pull-up (5–10 kΩ); transmits 16-/14-/12-bit two's complement codes and config register bits.
SCL	I²C serial clock input	Open-drain input; accepts 100 kHz / 400 kHz / 3.4 MHz clocks; rising edge latches input data, falling edge drives output data.

Key Features

Feature	Design Value
Self-calibrating offset and gain	Per-conversion auto-calibration eliminates system-level drift compensation firmware and reduces calibration overhead in embedded hosts.
On-board 2.048V reference	15 ppm/°C drift and ±0.05% initial accuracy enable stable full-scale definition without external reference components or layout area.
Programmable gain amplifier (x1/x2/x4/x8)	Extends effective dynamic range: supports microvolt-level thermocouple signals (x8) and volt-level bridge outputs (x1) on same device.
One-shot conversion mode	Reduces average current to sub-microamp levels (e.g., 0.56 µA at 12-bit), ideal for wake-on-event sensor nodes and intermittent measurement systems.
Differential input architecture	105–110 dB common-mode rejection (DC, PGA=1–8) rejects noise from shared ground paths and long sensor cables in industrial settings.

Applications

Temperature Sensing with RTD/Thermistor	Bridge Sensing for Pressure & Strain
Use Scenario: Measuring resistance change in Pt100 RTDs or NTC thermistors using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Precision 16-bit ΔΣ ADC digitizes differential voltage across sensing element; internal reference enables ratiometric accuracy independent of supply variation. Use Value: Achieves <0.1°C temperature resolution with 10 ppm INL and self-calibration - eliminating external calibration tables in HVAC and medical thermometers.	Use Scenario: Reading output of Wheatstone bridge pressure transducers (e.g., 30 mV full-scale) in industrial process control systems. IC Role / Device Role / Timing Role: Configured at x8 PGA gain to resolve 12-bit bridge output within ±256 mV range; differential inputs reject common-mode noise from motor drives and EMI sources. Use Value: Delivers stable 0.05% FS accuracy over –40°C to +125°C without external op-amps or trimming, reducing BOM cost and board space.
Weigh Scales and Load Cells	Battery Fuel Gauging
Use Scenario: Digitizing mV-level output from strain-gauge load cells in platform scales and industrial weighing terminals. IC Role / Device Role / Timing Role: Operates in continuous 15 SPS mode with x8 PGA; internal oscillator and self-calibration ensure consistent LSB weight resolution across battery discharge cycles. Use Value: Enables Class III legal-for-trade accuracy (≤10,000 divisions) with no external zero/span adjustment - simplifying production test and field recalibration.	Use Scenario: Monitoring cell voltage and current sense shunt voltage in multi-cell Li-ion battery packs for state-of-charge estimation. IC Role / Device Role / Timing Role: Uses one-shot mode to sample voltage/current at defined intervals; low 0.56 µA standby current extends battery life in always-on fuel gauges. Use Value: Provides 16-bit resolution on shunt voltage (e.g., 50 mV FS at x8) for <1 mA current measurement accuracy - critical for coulomb counting in portable electronics.

Temperature Sensing with RTD/Thermistor

Bridge Sensing for Pressure & Strain

Use Scenario: Measuring resistance change in Pt100 RTDs or NTC thermistors using constant-current excitation and ratiometric ADC conversion.

IC Role / Device Role / Timing Role: Precision 16-bit ΔΣ ADC digitizes differential voltage across sensing element; internal reference enables ratiometric accuracy independent of supply variation.

Use Value: Achieves <0.1°C temperature resolution with 10 ppm INL and self-calibration - eliminating external calibration tables in HVAC and medical thermometers.

Use Scenario: Reading output of Wheatstone bridge pressure transducers (e.g., 30 mV full-scale) in industrial process control systems.

IC Role / Device Role / Timing Role: Configured at x8 PGA gain to resolve 12-bit bridge output within ±256 mV range; differential inputs reject common-mode noise from motor drives and EMI sources.

Use Value: Delivers stable 0.05% FS accuracy over –40°C to +125°C without external op-amps or trimming, reducing BOM cost and board space.

Weigh Scales and Load Cells

Battery Fuel Gauging

Use Scenario: Digitizing mV-level output from strain-gauge load cells in platform scales and industrial weighing terminals.

IC Role / Device Role / Timing Role: Operates in continuous 15 SPS mode with x8 PGA; internal oscillator and self-calibration ensure consistent LSB weight resolution across battery discharge cycles.

Use Value: Enables Class III legal-for-trade accuracy (≤10,000 divisions) with no external zero/span adjustment - simplifying production test and field recalibration.

Use Scenario: Monitoring cell voltage and current sense shunt voltage in multi-cell Li-ion battery packs for state-of-charge estimation.

IC Role / Device Role / Timing Role: Uses one-shot mode to sample voltage/current at defined intervals; low 0.56 µA standby current extends battery life in always-on fuel gauges.

Use Value: Provides 16-bit resolution on shunt voltage (e.g., 50 mV FS at x8) for <1 mA current measurement accuracy - critical for coulomb counting in portable electronics.

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 internal reference; requires external 2.048V ref or uses VDD as reference.	Lacks on-board reference and self-calibration - demands more host firmware effort for offset/gain correction across temperature.	Select when needing 4 input channels and external reference control; avoid if minimizing design complexity and calibration overhead is critical.
MCP3421A0T-E/CH	Single-channel variant in SOT-23-6; identical PGA, reference, and I²C interface but half the channel count.	Not suitable for dual-sensor applications (e.g., temperature + pressure); limited to space-constrained single-input use cases.	Choose for ultra-small footprint where only one differential channel is required and MSOP-8 layout area is unavailable.

Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the MCP3426A0-E/MS uniquely combines factory-programmed I²C address, integrated reference, per-conversion self-calibration, and dual-channel capability in an industry-standard MSOP-8 - delivering lower total system cost and faster time-to-market for dual-sensor industrial designs.

Availability

MCP3426A0-E/MS is available at Aetrix Electronics and suitable for industrial automation equipment, portable instrumentation, and battery-powered sensor nodes requiring stable component supply with extended temperature support and long-term lifecycle assurance.

Supply support for MCP3426A0-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 microcontrollers, analog devices, 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 functionality, minimal external components, and robust operation across harsh environmental conditions.

FAQ

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

The MCP3426A0-E/MS has a fixed, factory-programmed I²C address of 0x68 (7-bit address). Unlike the MCP3427/MCP3428, it lacks external address pins (Adr0/Adr1), so multiple MCP3426A0-E/MS devices require unique addresses via hardware design or software arbitration - the MCP3426A0-E/MS itself cannot be reconfigured to alternate addresses.

Does the MCP3426A0-E/MS support single-ended input configurations?

Yes, the MCP3426A0-E/MS supports single-ended operation: CH1– and CH2– can each be tied to VSS, converting CH1+ and CH2+ relative to ground. However, this sacrifices common-mode rejection and effective resolution - differential mode is strongly recommended for noise immunity and full 16-bit performance as specified in the MCP3426A0-E/MS datasheet.

How does the self-calibration feature of the MCP3426A0-E/MS operate during conversion?

The MCP3426A0-E/MS performs full offset and gain calibration automatically before every conversion cycle using its internal 2.048V reference. This eliminates accumulated drift from temperature shifts or supply fluctuations - no host intervention or external calibration sequence is needed. Calibration time is included in the total conversion period (e.g., 66.7 ms for 15 SPS mode), and the result reflects calibrated data directly.

What is the maximum allowable source impedance for analog inputs on the MCP3426A0-E/MS?

The MCP3426A0-E/MS specifies a typical differential input impedance of 2.25 MΩ / PGA (e.g., 281 kΩ at x8 gain). To maintain 10 ppm INL accuracy, the external source impedance should be ≤1 kΩ - higher impedances increase settling time and introduce gain/offset errors due to incomplete charging of the 3.2 pF internal sampling capacitor during conversion.

Can the MCP3426A0-E/MS operate reliably at 5.5V supply while maintaining 16-bit accuracy?

Yes, the MCP3426A0-E/MS is fully specified from 2.7V to 5.5V. At 5.5V, its gain error remains ≤0.1% and INL stays at 10 ppm of full scale, as confirmed in the DS22226A datasheet. Supply current increases slightly (180 µA typical in continuous mode), but all key AC/DC specifications - including reference stability, noise, and linearity - are maintained across the full voltage range.

MCP3426A0-E/MS Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3426A0-E/MS FAQ

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

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

The price and inventory of MCP3426A0-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 MCP3426A0-E/MS is usually 5 days.

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

Once your MCP3426A0-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 MCP3426A0-E/MS?

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

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

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

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

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

Return procedure for MCP3426A0-E/MS:

1.Submit a request within 90 days.

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

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