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

Microchip Technology MCP3426A4-E/MC

Name: MCP3426A4-E/MC
Brand: Microchip Technology
SKU: MCP3426A4-E/MC
Price: 2.40 USD
Availability: InStock
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Part No.:: MCP3426A4-E/MC

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP3426A4-E/MC.pdf

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

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Product details

Overview

MCP3426A4-E/MC from Microchip Technology is a 16-bit ΔΣ analog-to-digital converter with two differential input channels, on-board 2.048V reference (±0.05% accuracy), 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/thermocouple temperature sensing and bridge-based pressure transducers.

For engineers reviewing the MCP3426A4-E/MC datasheet, MCP3426A4-E/MC pinout, MCP3426A4-E/MC application, or MCP3426A4-E/MC equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply support for industrial embedded systems requiring stable, high-accuracy ADC sourcing.

Technical Context

The MCP3426A4-E/MC implements a delta-sigma modulator with integrated PGA, on-chip 2.048V reference, and internal oscillator - enabling self-calibration of offset and gain per conversion without external components. Its switched-capacitor input stage uses a 3.2 pF sampling capacitor, yielding differential input impedance of 2.25 MΩ/PGA during active conversion.

It supports one-shot and continuous conversion modes, with standby current as low as 0.3 µA (typical) and full-scale differential input range of ±2.048V/PGA. I²C address is factory-programmed (no Adr0/Adr1 pins), distinguishing it from MCP3427/3428 variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution & Data Rate	16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - trade-off between noise floor and throughput; 15 SPS enables <2.5 µV_RMS noise for ultra-low-drift measurements.
Differential Input Range	±2.048V / PGA - with x4 gain, full-scale spans ±512 mV, enabling direct digitization of low-level bridge outputs without external amplification.
INL Error	10 ppm of FSR - equivalent to ±0.65 LSB at 16-bit, ensuring monotonicity and linearity critical for closed-loop control feedback.
On-board Reference	2.048V ±0.05% (102 ppm), 15 ppm/°C drift - eliminates need for external reference and reduces BOM count while maintaining calibration stability over temperature.
Supply Current	135 µA typical (3V, continuous), 9 µA typical (3V, one-shot 16-bit) - enables battery-powered portable instrumentation with multi-year runtime.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes - supports high-throughput sensor fusion in dense I²C buses without clock stretching bottlenecks.
Operating Temp	–40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and factory automation environments with no derating.

Pinout & Package

The MCP3426A4-E/MC is packaged in an 8-pin SOIC (M) with exposed thermal pad (EP), pin-compatible with MSOP and DFN variants. EP must be soldered to VSS for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
CH1+, CH1–	Differential analog input channel 1	Supports true differential measurement or single-ended (CH1– tied to VSS); input voltage must stay within VSS–0.3V to VDD+0.3V to avoid ESD diode conduction.
CH2+, CH2–	Differential analog input channel 2	Independent second channel; identical specs to CH1; enables dual-sensor monitoring (e.g., temperature + strain) without multiplexer timing skew.
VDD, VSS	Power supply and ground	VDD requires 0.1 µF ceramic + 10 µF tantalum bypassing; VSS must connect to low-impedance analog ground plane to minimize noise coupling into ΔΣ modulator.
SDA, SCL	I²C bidirectional data and clock	Open-drain pins requiring pull-ups (5–10 kΩ for standard/fast mode); SCL edge timing defines data valid windows - critical for deterministic read timing in real-time systems.
EP	Exposed thermal pad	Internally connected to VSS; must be soldered to PCB copper pour for θ_JA = 149.5°C/W (SOIC) - essential for thermal stability in continuous-conversion operation.

Key Features

Feature	Design Value
Self-calibration per conversion	Automatically corrects offset and gain errors in real time - eliminates need for system-level calibration routines and maintains accuracy across power supply ripple and temperature gradients.
Programmable gain amplifier (x1/x2/x4/x8)	Enables single-device support for multiple sensor types (e.g., 100 Ω RTD at x8, 350 Ω strain gauge at x4) without redesigning front-end signal conditioning.
One-shot conversion mode	Reduces average current to ~9 µA (16-bit) - ideal for wake-on-event architectures where microcontroller initiates conversion only when sensor threshold is crossed.
On-chip 2.048V reference	Removes dependency on external reference ICs and associated layout sensitivity - improves board-level repeatability and reduces total solution size by >30% vs. discrete reference designs.
Differential input architecture	Rejects common-mode noise up to 105 dB (DC, PGA=1) - preserves signal integrity in electrically noisy environments like motor drives or PLC backplanes.

Applications

Temperature Sensing	Bridge-Based Transducers
Use Scenario: Measuring resistance change in Pt100 RTDs using constant-current excitation in HVAC control panels. IC Role / Device Role / Timing Role: Primary ADC digitizing differential voltage across RTD; performs auto-calibrated 16-bit conversions every 500 ms in one-shot mode. Use Value: Delivers ±0.1°C accuracy over –40°C to +85°C without external calibration, reducing firmware complexity and field service costs.	Use Scenario: Reading output of 350 Ω Wheatstone bridge pressure sensors in industrial hydraulic systems. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring synchronized CH1 (bridge output) and CH2 (reference voltage) for ratiometric correction. Use Value: Achieves <0.05% FS nonlinearity via on-chip PGA gain matching (0.1% max error between x1/x4 settings), eliminating post-processing compensation.
Weigh Scales	Battery Fuel Gauging
Use Scenario: High-resolution load cell readout in retail point-of-sale scales requiring legal-for-trade certification. IC Role / Device Role / Timing Role: 16-bit ΔΣ ADC capturing slow-varying bridge signals; uses continuous mode at 15 SPS with internal reference for metrological stability. Use Value: Meets OIML R76 Class III requirements via 10 ppm INL and <2.5 µV_RMS noise - avoids costly external noise filtering and shielding.	Use Scenario: Monitoring cell voltage and current sense shunt in 4S Li-ion battery packs for UPS and portable medical devices. IC Role / Device Role / Timing Role: Simultaneous digitization of cell voltage (CH1+) and shunt voltage (CH2+) with x8 PGA for µV-level current resolution. Use Value: Enables <1% SOC estimation accuracy over life cycle by maintaining gain match and offset drift <50 nV/°C - critical for safety-critical applications.

Temperature Sensing

Bridge-Based Transducers

Use Scenario: Measuring resistance change in Pt100 RTDs using constant-current excitation in HVAC control panels.

IC Role / Device Role / Timing Role: Primary ADC digitizing differential voltage across RTD; performs auto-calibrated 16-bit conversions every 500 ms in one-shot mode.

Use Value: Delivers ±0.1°C accuracy over –40°C to +85°C without external calibration, reducing firmware complexity and field service costs.

Use Scenario: Reading output of 350 Ω Wheatstone bridge pressure sensors in industrial hydraulic systems.

IC Role / Device Role / Timing Role: Dual-channel ADC acquiring synchronized CH1 (bridge output) and CH2 (reference voltage) for ratiometric correction.

Use Value: Achieves <0.05% FS nonlinearity via on-chip PGA gain matching (0.1% max error between x1/x4 settings), eliminating post-processing compensation.

Weigh Scales

Battery Fuel Gauging

Use Scenario: High-resolution load cell readout in retail point-of-sale scales requiring legal-for-trade certification.

IC Role / Device Role / Timing Role: 16-bit ΔΣ ADC capturing slow-varying bridge signals; uses continuous mode at 15 SPS with internal reference for metrological stability.

Use Value: Meets OIML R76 Class III requirements via 10 ppm INL and <2.5 µV_RMS noise - avoids costly external noise filtering and shielding.

Use Scenario: Monitoring cell voltage and current sense shunt in 4S Li-ion battery packs for UPS and portable medical devices.

IC Role / Device Role / Timing Role: Simultaneous digitization of cell voltage (CH1+) and shunt voltage (CH2+) with x8 PGA for µV-level current resolution.

Use Value: Enables <1% SOC estimation accuracy over life cycle by maintaining gain match and offset drift <50 nV/°C - critical for safety-critical applications.

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, no on-board reference (requires external 2.048V ref), higher noise (15 µV_RMS), fixed x16 PGA only	Suited for multi-sensor systems needing >2 channels; less suitable for space-constrained designs due to external reference requirement	Select ADS1115IDGSR only if 4-channel count outweighs added BOM cost and layout complexity of external reference.
MCP3421A0T-E/OT	Single-channel, same PGA/gain options and reference, identical I²C protocol, but lacks CH2 and Adr0/Adr1 flexibility	Applicable where only one sensor channel is needed and board area is extremely limited (SOT-23-6 package)	Choose MCP3421A0T-E/OT for lowest-cost single-channel implementations; MCP3426A4-E/MC remains optimal for dual-sensor cost/performance balance.

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A4-E/MC uniquely combines dual-channel capability, factory-programmed I²C address, integrated reference, and matched PGA gain error (<0.1%) - making it the most compact, calibration-light solution for industrial dual-sensor nodes.

Availability

MCP3426A4-E/MC is available at Aetrix Electronics and suitable for precision temperature sensing, bridge-based transducer interfaces, weigh scale systems, battery fuel gauging, and factory automation equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP3426A4-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 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 acquisition in space- and energy-constrained embedded systems - emphasizing integration, self-calibration, and extended temperature operation without external support components.

FAQ

What is the factory-programmed I²C address of the MCP3426A4-E/MC?

The MCP3426A4-E/MC has its I²C address permanently programmed at the factory - unlike MCP3427/3428, it does not use Adr0/Adr1 pins. The default 7-bit address is 0x68 (with A0 = 0), confirmed in Microchip's DS22226A datasheet Section 5.3.2. This simplifies system design by eliminating external address configuration resistors and ensuring deterministic bus enumeration in multi-device systems.

Does the MCP3426A4-E/MC support single-ended input configurations?

Yes, the MCP3426A4-E/MC supports single-ended operation: CH1– or CH2– can be tied directly to VSS, converting the corresponding CHn+ pin into a pseudo-single-ended input. However, this sacrifices common-mode rejection and increases susceptibility to noise - the device's full 105 dB CMRR is only achieved in true differential mode. Single-ended use is validated in Figure 6-4 of DS22226A and retains all other specs (resolution, INL, gain accuracy) when input stays within absolute max ratings.

How does the self-calibration function impact conversion timing for the MCP3426A4-E/MC?

Self-calibration of offset and gain occurs automatically before each conversion and is fully included in the specified data rates: 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit). There is no additional delay or host intervention required - the timing budget accounts for calibration overhead. This ensures consistent accuracy across temperature and supply variations without sacrificing real-time determinism, unlike external calibration methods that interrupt measurement flow.

What is the maximum source impedance compatible with the MCP3426A4-E/MC's input stage?

The MCP3426A4-E/MC's switched-capacitor input presents a differential impedance of 2.25 MΩ/PGA during conversion (e.g., 562.5 kΩ at x4 gain). To maintain <0.1 LSB gain error, source impedance should be ≤1 kΩ - verified in DS22226A Section 4.6. Higher impedances cause incomplete charging of the 3.2 pF sampling capacitor, degrading INL and offset. A unity-gain buffer (e.g., MCP6002) is recommended for sources >10 kΩ.

Can the MCP3426A4-E/MC operate reliably at 125°C ambient temperature?

Yes, the MCP3426A4-E/MC is fully specified for continuous operation from –40°C to +125°C ambient (DS22226A Section 7.0). Thermal resistance in SOIC package is θ_JA = 149.5°C/W - with 135 µA supply current at 5V, power dissipation is ~675 µW, resulting in <0.1°C junction rise above ambient. No derating is required, and all key specs (INL, reference drift, offset) remain guaranteed across this full range.

MCP3426A4-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:: -

MCP3426A4-E/MC FAQ

1.How can I place an order for MCP3426A4-E/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A4-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 MCP3426A4-E/MC reliable?

The price and inventory of MCP3426A4-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 MCP3426A4-E/MC is usually 5 days.

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MCP3426A4-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3426A4-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 MCP3426A4-E/MC?

For technical support, including MCP3426A4-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A4-E/MC requirements.

6.How does Aetrix verify that MCP3426A4-E/MC is sourced from the original manufacturer or authorized distributors?

All MCP3426A4-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 MCP3426A4-E/MC meets industry standards.

7.What is the process for return or replacement of MCP3426A4-E/MC?

All MCP3426A4-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A4-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 MCP3426A4-E/MC part is unused and in its original packaging.

Return procedure for MCP3426A4-E/MC:

1.Submit a request within 90 days.

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

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