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

Microchip Technology MCP3426A3-E/SN

Name: MCP3426A3-E/SN
Brand: Microchip Technology
SKU: MCP3426A3-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A3-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3426A3-E/SN.pdf

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

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Product details

Overview

MCP3426A3-E/SN 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 temperature sensing and bridge-based pressure measurement systems.

For engineers reviewing the MCP3426A3-E/SN datasheet, MCP3426A3-E/SN pinout, MCP3426A3-E/SN application, or MCP3426A3-E/SN equivalent, key selection criteria include differential channel count, self-calibrating offset/gain per conversion, PGA-configurable input range (±2.048V/PGA), low-power one-shot mode (0.56 µA at 12-bit), and factory-programmed I²C address for plug-and-play integration in space-constrained industrial sensor nodes.

Technical Context

The MCP3426A3-E/SN implements a delta-sigma modulator with integrated 3.2 pF sampling capacitor, on-chip oscillator, and auto-calibration logic that corrects offset and gain errors before each conversion. Its switched-capacitor front-end requires source impedances ≤2.25 MΩ/PGA to maintain specified INL and settling performance.

It uses a binary two's complement output format with MSB-first I²C transmission, supports differential or single-ended inputs per channel, and enforces strict input voltage limits: |CHn+ − CHn−| ≤ 2.048V/PGA and absolute pin voltages between VSS−0.3V and VDD+0.3V to prevent ESD diode conduction and leakage-induced errors.

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; defines effective dynamic range and noise floor.
Differential Input Range	±2.048V / PGA - full-scale range scales inversely with gain setting (e.g., ±256 mV at x8), enabling high-resolution measurement of weak signals.
INL Error	10 ppm of full-scale range - ensures monotonicity and <0.00025% linearity deviation over temperature and supply variation.
On-board Reference	2.048V ±0.05% (15 ppm/°C drift) - eliminates external reference component, reduces BOM count, and stabilizes gain accuracy.
Supply Current	135 µA typical (3V, continuous); 0.56 µA typical (12-bit one-shot) - enables battery-powered operation with >1-year runtime on coin cell.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller timing and noise-immune communication in noisy environments.
Operating Temp.	–40°C to +125°C - qualified for under-hood automotive, industrial motor control, and factory automation applications.

Pinout & Package

The MCP3426A3-E/SN is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), pin-compatible with MSOP and DFN variants. The EP must be soldered to VSS for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
CH1+, CH1−	Differential analog input channel 1	Accepts true differential signal up to ±2.048V/PGA; CH1− may be tied to VSS for single-ended use.
CH2+, CH2−	Differential analog input channel 2	Independent second channel with identical specs; enables dual-sensor monitoring without multiplexer latency.
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; internally tied to EP for thermal dissipation.
VDD	Positive supply (2.7–5.5V)	Requires 0.1 µF ceramic + 10 µF tantalum bypassing; POR threshold is 2.2V ±5% with 200 mV hysteresis.
SDA	I²C bidirectional data line	Open-drain output; requires external pull-up (5–10 kΩ for standard/fast mode); transmits 16/14/12-bit two's complement codes MSB-first.
SCL	I²C serial clock input	Open-drain input; accepts external clock edges; rising edge latches input, falling edge drives output; pull-up required.

Key Features

Feature	Design Value
Self-calibrating offset & gain	Per-conversion correction eliminates need for system-level calibration routines and maintains accuracy across temperature swings.
Programmable gain amplifier (x1/x2/x4/x8)	Enables single ADC to resolve µV-level thermocouple outputs or mV-level strain gauge bridges without external op-amps.
One-shot conversion mode	Reduces average current to sub-µA levels during idle periods - critical for energy harvesting and wireless sensor node designs.
On-board 2.048V reference	Removes dependency on external reference ICs, reduces layout sensitivity to noise coupling, and guarantees matched tempco with ADC core.
Differential input architecture	Rejects common-mode noise up to 105 dB (DC, PGA=1), essential for measurements in electrically noisy industrial environments.

Applications

Temperature Sensing with RTD	Bridge-Based Pressure Sensing
Use Scenario: Measuring resistance change of Pt100/1000 RTDs in HVAC controllers or process instrumentation. IC Role / Device Role / Timing Role: Precision 16-bit ΔΣ ADC digitizing ratiometric voltage across RTD+precision resistor, with PGA gain set to x8 for optimal SNR. Use Value: Achieves <0.1°C resolution over –40°C to +125°C using internal reference and self-calibration - no external trimming required.	Use Scenario: Reading output of Wheatstone bridge pressure transducers in medical infusion pumps or industrial hydraulic systems. IC Role / Device Role / Timing Role: Differential ADC capturing microvolt-level bridge imbalance with 10 ppm INL and 105 dB CMRR to suppress supply ripple and EMI. Use Value: Delivers stable 16-bit readings at 15 SPS while consuming only 135 µA - extends battery life in portable diagnostic equipment.
Weigh Scale Load Cell Interface	Battery Fuel Gauge Monitoring
Use Scenario: Converting mV output of 350 Ω load cells in retail or industrial weighing platforms. IC Role / Device Role / Timing Role: Two-channel ADC simultaneously sampling excitation voltage and bridge output for ratiometric correction, reducing sensitivity to supply drift. Use Value: Enables <10 mg resolution on 10 kg scale using factory-calibrated PGA and on-board reference - eliminates calibration labor during production.	Use Scenario: Monitoring cell voltage and current sense shunt in lithium-ion battery packs for UPS or power tools. IC Role / Device Role / Timing Role: Dual-channel ADC measuring both battery terminal voltage (CH1) and shunt voltage (CH2) with synchronized sampling and auto-gain selection. Use Value: Supports accurate state-of-charge estimation via 16-bit resolution at 15 SPS and ultra-low standby current (0.3 µA) during sleep cycles.

Temperature Sensing with RTD

Bridge-Based Pressure Sensing

Use Scenario: Measuring resistance change of Pt100/1000 RTDs in HVAC controllers or process instrumentation.

IC Role / Device Role / Timing Role: Precision 16-bit ΔΣ ADC digitizing ratiometric voltage across RTD+precision resistor, with PGA gain set to x8 for optimal SNR.

Use Value: Achieves <0.1°C resolution over –40°C to +125°C using internal reference and self-calibration - no external trimming required.

Use Scenario: Reading output of Wheatstone bridge pressure transducers in medical infusion pumps or industrial hydraulic systems.

IC Role / Device Role / Timing Role: Differential ADC capturing microvolt-level bridge imbalance with 10 ppm INL and 105 dB CMRR to suppress supply ripple and EMI.

Use Value: Delivers stable 16-bit readings at 15 SPS while consuming only 135 µA - extends battery life in portable diagnostic equipment.

Weigh Scale Load Cell Interface

Battery Fuel Gauge Monitoring

Use Scenario: Converting mV output of 350 Ω load cells in retail or industrial weighing platforms.

IC Role / Device Role / Timing Role: Two-channel ADC simultaneously sampling excitation voltage and bridge output for ratiometric correction, reducing sensitivity to supply drift.

Use Value: Enables <10 mg resolution on 10 kg scale using factory-calibrated PGA and on-board reference - eliminates calibration labor during production.

Use Scenario: Monitoring cell voltage and current sense shunt in lithium-ion battery packs for UPS or power tools.

IC Role / Device Role / Timing Role: Dual-channel ADC measuring both battery terminal voltage (CH1) and shunt voltage (CH2) with synchronized sampling and auto-gain selection.

Use Value: Supports accurate state-of-charge estimation via 16-bit resolution at 15 SPS and ultra-low standby current (0.3 µA) during sleep cycles.

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 uses VDD as reference.	Higher speed but lower INL (15 ppm vs. 10 ppm); lacks per-conversion self-calibration - needs periodic system recalibration.	Select when multi-channel count >2 is required and external reference is already present; avoid where long-term drift stability is critical.
MCP3421A0T-E/OT	Single-channel, 18-bit, 15 SPS; same on-board 2.048V ref, PGA, and I²C interface; factory-programmed address like MCP3426A3-E/SN.	Higher resolution but no second channel; unsuitable for dual-sensor applications requiring simultaneous sampling.	Choose for ultra-high-precision single-signal measurement where space or cost prohibits dual MCP3426 usage.

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A3-E/SN uniquely balances dual-channel capability, on-board reference, self-calibration, and ultra-low one-shot current - making it optimal for compact, maintenance-free industrial sensor nodes requiring two independent high-accuracy measurements.

Availability

MCP3426A3-E/SN is available at Aetrix Electronics and suitable for precision temperature sensing, bridge-based pressure transduction, weigh scale load cell interfacing, battery fuel gauging, and factory automation equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MCP3426A3-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 devices, 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 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 MCP3426A3-E/SN?

The MCP3426A3-E/SN has its I²C address permanently programmed at the factory - unlike the MCP3427/MCP3428, it does not use Adr0/Adr1 pins for address configuration. Its default 7-bit address is 0x68 (1101000b), confirmed in Microchip's DS22226A datasheet Section 5.3.1. This fixed addressing simplifies firmware integration and avoids bus conflicts in multi-device systems where the MCP3426A3-E/SN serves as a dedicated sensor ADC.

Does the MCP3426A3-E/SN support single-ended input configurations?

Yes, the MCP3426A3-E/SN supports single-ended operation: CH1− and CH2− can each be tied to VSS to convert CH1+ and CH2+ relative to ground. However, this sacrifices common-mode rejection and reduces effective resolution by ~3 bits compared to true differential mode. The device retains full 16-bit capability in single-ended mode, but INL and noise performance degrade due to loss of CMRR - use only when differential signaling is impractical and source impedance is very low (<1 kΩ).

How does the self-calibration feature of the MCP3426A3-E/SN operate?

The MCP3426A3-E/SN performs full offset and gain calibration automatically before every conversion - no host intervention required. During calibration, it measures internal zero-scale and full-scale references, then adjusts digital output accordingly. This corrects for drift caused by temperature changes (±50 nV/°C offset drift) and supply fluctuations (5 ppm/V gain drift), ensuring consistent 10 ppm INL performance across –40°C to +125°C without external calibration hardware or software routines.

What is the maximum allowable source impedance for the MCP3426A3-E/SN analog inputs?

The MCP3426A3-E/SN's switched-capacitor input stage presents a differential impedance of 2.25 MΩ/PGA during conversion (e.g., 281 kΩ at PGA=8). To maintain specified INL and settling time, total source impedance (including PCB traces and sensor output) must be ≤1/10th of this value - i.e., ≤28 kΩ at PGA=8. Higher impedances cause incomplete capacitor charging, resulting in gain error and increased INL. Use op-amp buffers for high-Z sources like thermistors or unbuffered RTDs.

Can the MCP3426A3-E/SN operate from a 2.7V supply while maintaining full 16-bit performance?

Yes, the MCP3426A3-E/SN is fully specified from 2.7V to 5.5V. At 2.7V, it delivers the same 16-bit resolution, 10 ppm INL, and ±2.048V/PGA input range as at higher voltages. Supply current increases slightly (145 µA typical vs. 135 µA at 3.0V), but all electrical characteristics - including reference accuracy (2.048V ±0.05%), PGA gain match (0.1%), and CMRR (105 dB) - remain guaranteed across the full voltage range per DS22226A-page 5.

MCP3426A3-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:: -

MCP3426A3-E/SN FAQ

1.How can I place an order for MCP3426A3-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A3-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 MCP3426A3-E/SN reliable?

The price and inventory of MCP3426A3-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 MCP3426A3-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3426A3-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A3-E/SN transactions.

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4.How is shipping managed for MCP3426A3-E/SN?

MCP3426A3-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3426A3-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 MCP3426A3-E/SN?

For technical support, including MCP3426A3-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A3-E/SN requirements.

6.How does Aetrix verify that MCP3426A3-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3426A3-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 MCP3426A3-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3426A3-E/SN?

All MCP3426A3-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A3-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 MCP3426A3-E/SN part is unused and in its original packaging.

Return procedure for MCP3426A3-E/SN:

1.Submit a request within 90 days.

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

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