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

Microchip Technology MCP3426A7T-E/MS

Name: MCP3426A7T-E/MS
Brand: Microchip Technology
SKU: MCP3426A7T-E/MS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A7T-E/MS

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3426A7T-E/MS.pdf

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

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Product details

Overview

MCP3426A7T-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 15 SPS at 16-bit resolution, 10 ppm INL, and operates from 2.7V to 5.5V across –40°C to +125°C - used in precision RTD temperature sensing and bridge-based pressure measurement.

For engineers reviewing the MCP3426A7T-E/MS datasheet, MCP3426A7T-E/MS pinout, MCP3426A7T-E/MS application, or MCP3426A7T-E/MS equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts for industrial sensor signal conditioning designs requiring low-noise, self-calibrating ADCs with integrated reference and PGA.

Technical Context

The MCP3426A7T-E/MS implements a delta-sigma modulation architecture with internal oscillator, auto-calibrating offset and gain per conversion, and a switched-capacitor front-end sampling at 3.2 pF. Its differential input structure supports both differential and single-ended configurations, with input impedance scaling inversely with PGA gain (2.25 MΩ at x1, 281 kΩ at x8).

Conversion control is fully managed via I²C: configuration register sets resolution (12/14/16-bit), channel (CH1 or CH2), PGA gain, and mode (one-shot or continuous). Factory-programmed I²C address eliminates external address pins - unlike MCP3427/28 - simplifying two-channel designs where address flexibility is unnecessary.

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 high-precision DC measurements.
Differential Input Range	±2.048 V / PGA - full-scale range adjusts with gain; e.g., ±256 mV at x8, enabling direct digitization of low-level bridge outputs without external amplification.
INL Accuracy	10 ppm of full scale - ±0.67 LSB error at 16-bit, ensuring monotonicity and linearity critical for calibration-critical instrumentation.
On-board Reference	2.048 V ±0.05% (15 ppm/°C drift) - eliminates need for external reference, reduces BOM count and layout sensitivity in space-constrained systems.
Supply Current	135 µA typical (3V, continuous); 9 µA typical (3V, one-shot 16-bit) - enables battery-powered portable instrumentation with multi-year operation.
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive sensors, industrial PLC analog inputs, and factory automation equipment.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes - supports fast host polling and real-time data streaming in embedded microcontroller systems.

Pinout & Package

Package: 8-pin MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with exposed pad (EP) internally connected to VSS - requires PCB thermal pad connection to ground plane for optimal θ_JA = 211°C/W performance.

Pin/Terminal	Circuit Role	Design Meaning
1 (CH1+)	Differential analog input, channel 1 positive	Accepts signal source for first differential pair; supports single-ended use when CH1– tied to VSS.
2 (CH1–)	Differential analog input, channel 1 negative	Completes CH1 differential pair; common-mode voltage must stay within VSS–0.3V to VDD+0.3V.
7 (CH2+)	Differential analog input, channel 2 positive	Second independent differential input; identical electrical specs to CH1+, enabling dual-sensor monitoring.
8 (CH2–)	Differential analog input, channel 2 negative	Completes CH2 differential pair; no crosstalk between CH1 and CH2 due to internal multiplexer isolation.
6 (VSS)	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pad ties internally to VSS for thermal and noise control.
3 (VDD)	Positive supply rail	2.7V–5.5V operation; requires 0.1 µF ceramic + 10 µF tantalum decoupling per datasheet layout guidelines.
4 (SDA)	I²C bidirectional data line	Open-drain output; needs external pull-up (5–10 kΩ for standard/fast mode); transmits 16-/14-/12-bit codes and status bits.
5 (SCL)	I²C serial clock input	Open-drain input; accepts master-generated clock up to 3.4 MHz; timing critical for high-speed mode compliance.

Key Features

Feature	Design Value
Self-calibrating offset and gain	Per-conversion auto-calibration eliminates system-level drift compensation firmware and ensures accuracy over temperature and supply variation.
Programmable gain amplifier (x1/x2/x4/x8)	Hardware-selectable gain enables single-component adaptation to multiple sensor types (e.g., 350 Ω strain gauge vs. 100 Ω RTD) without redesigning front-end circuitry.
On-board 2.048 V reference	Integrated reference removes external component dependency, reduces layout sensitivity to noise coupling, and guarantees matched tempco between reference and ADC core.
One-shot conversion mode	Enters sub-1 µA standby after each conversion - ideal for event-triggered sensing (e.g., wake-on-change thermistor monitoring) in energy-harvesting systems.
Differential input architecture	Rejects common-mode noise up to 105 dB (PGA=1) or 110 dB (PGA=8), preserving signal integrity in electrically noisy industrial environments.

Applications

RTD Temperature Sensing	Strain Gauge Bridge Monitoring
Use Scenario: Measuring resistance change in Pt100/Pt1000 RTDs using constant-current excitation and ratiometric measurement. IC Role / Device Role / Timing Role: Precision 16-bit digitizer for bridge output voltage; uses internal reference and PGA to resolve microvolt-level changes corresponding to 0.01°C resolution. Use Value: Eliminates external op-amp and reference IC, reducing component count by ≥3 while maintaining ±0.1°C accuracy over –40°C to +125°C.	Use Scenario: Reading output of 350 Ω Wheatstone bridge in load cell or pressure transducer with 10 mV/V sensitivity. IC Role / Device Role / Timing Role: Low-noise, high-PSRR ADC capturing bridge imbalance voltage; leverages 105 dB CMRR to reject supply ripple and EMI-induced common-mode interference. Use Value: Achieves <1 µV_PP noise floor at 15 SPS, enabling 1:50,000 dynamic range for 16-bit weight resolution without external filtering.
Thermocouple Cold-Junction Compensation	Battery Fuel Gauging
Use Scenario: Measuring cold-junction temperature via thermistor in K-type thermocouple systems, then compensating digital thermocouple output. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously digitizing thermocouple voltage (CH1) and thermistor voltage (CH2), synchronized via I²C command sequence. Use Value: Single-chip solution replaces discrete ADC + temperature sensor + level-shifter, cutting board area by 40% and eliminating inter-channel timing skew.	Use Scenario: Monitoring cell voltage and current-sense resistor voltage in Li-ion battery packs for state-of-charge estimation. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC acquiring voltage samples during charge/discharge cycles; one-shot mode minimizes quiescent current during idle periods. Use Value: 15 ppm/°C reference drift and 10 ppm INL enable <1% SOC error over full temperature range without periodic recalibration.

RTD Temperature Sensing

Strain Gauge Bridge Monitoring

Use Scenario: Measuring resistance change in Pt100/Pt1000 RTDs using constant-current excitation and ratiometric measurement.

IC Role / Device Role / Timing Role: Precision 16-bit digitizer for bridge output voltage; uses internal reference and PGA to resolve microvolt-level changes corresponding to 0.01°C resolution.

Use Value: Eliminates external op-amp and reference IC, reducing component count by ≥3 while maintaining ±0.1°C accuracy over –40°C to +125°C.

Use Scenario: Reading output of 350 Ω Wheatstone bridge in load cell or pressure transducer with 10 mV/V sensitivity.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR ADC capturing bridge imbalance voltage; leverages 105 dB CMRR to reject supply ripple and EMI-induced common-mode interference.

Use Value: Achieves <1 µV_PP noise floor at 15 SPS, enabling 1:50,000 dynamic range for 16-bit weight resolution without external filtering.

Thermocouple Cold-Junction Compensation

Battery Fuel Gauging

Use Scenario: Measuring cold-junction temperature via thermistor in K-type thermocouple systems, then compensating digital thermocouple output.

IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously digitizing thermocouple voltage (CH1) and thermistor voltage (CH2), synchronized via I²C command sequence.

Use Value: Single-chip solution replaces discrete ADC + temperature sensor + level-shifter, cutting board area by 40% and eliminating inter-channel timing skew.

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

IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC acquiring voltage samples during charge/discharge cycles; one-shot mode minimizes quiescent current during idle periods.

Use Value: 15 ppm/°C reference drift and 10 ppm INL enable <1% SOC error over full temperature range without periodic recalibration.

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 2.048 V ref or uses VDD as reference.	Higher speed but lower noise floor (150 nV_RMS vs. 2.5 µV_RMS); lacks auto-calibration - needs system-level offset/gain correction.	Choose ADS1115IDGSR when >240 SPS is required and external reference is acceptable; avoid if self-calibration or ultra-low noise at DC is mandatory.
MCP3421A0T-E/OT	Single-channel, 18-bit, 15 SPS; same on-board 2.048 V reference, PGA, and I²C interface; factory-set address only.	Higher resolution but no second channel; identical package (SOT-23-6) and footprint - not pin-compatible with MSOP-8.	Choose MCP3421A0T-E/OT for single-sensor, higher-resolution applications where space is constrained and dual-channel capability is unnecessary.

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A7T-E/MS uniquely balances dual-channel capability, on-board reference, self-calibration, and ultra-low noise at 15 SPS - making it optimal for compact, calibration-free industrial sensor nodes where channel count and long-term stability outweigh raw speed or bit depth.

Availability

MCP3426A7T-E/MS is available at Aetrix Electronics and suitable for RTD temperature sensing, strain gauge bridge monitoring, thermocouple cold-junction compensation, and battery fuel gauging requiring stable component supply across automotive, industrial, and medical device production lifecycles.

Supply support for MCP3426A7T-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 components, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with vertically integrated silicon and development tools.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in space- and power-constrained embedded systems - emphasizing integration (reference, PGA, oscillator), ease of use (self-calibration, I²C), and robustness (–40°C to +125°C).

FAQ

What is the factory-programmed I²C address of the MCP3426A7T-E/MS?

The MCP3426A7T-E/MS has its I²C address permanently programmed at the factory and does not use external address pins (Adr0/Adr1). Its default 7-bit address is 0x68 (1101000b) when A0 = low, matching the base address of the MCP3426 family. This fixed addressing simplifies PCB layout and eliminates address conflicts in multi-device I²C buses where only one MCP3426A7T-E/MS is deployed.

Does the MCP3426A7T-E/MS support single-ended input configurations?

Yes, the MCP3426A7T-E/MS supports single-ended operation: CH1– and CH2– can be tied to VSS, allowing CH1+ and CH2+ to serve as independent single-ended inputs. However, doing so halves the effective input range (e.g., 0–2.048 V instead of ±2.048 V) and reduces common-mode rejection. The device's differential architecture remains active, so noise immunity is lower than true differential mode.

How does the self-calibration function impact conversion timing for the MCP3426A7T-E/MS?

Each conversion cycle of the MCP3426A7T-E/MS includes automatic offset and gain calibration, extending total conversion time beyond pure sampling duration. At 15 SPS (16-bit mode), the full cycle - including calibration - takes ~66.7 ms. This ensures measurement accuracy remains stable across temperature and supply shifts without requiring manual recalibration or host intervention.

Can the MCP3426A7T-E/MS operate reliably at 2.7 V supply voltage?

Yes, the MCP3426A7T-E/MS is fully specified for 2.7 V to 5.5 V operation. At 2.7 V, typical supply current is 135 µA in continuous mode and 9 µA in one-shot 16-bit mode. All key specifications - including INL (10 ppm), reference accuracy (±0.05%), and CMRR (105 dB) - are guaranteed across this full voltage range per DS22226A.

What is the role of the exposed thermal pad (EP) on the MCP3426A7T-E/MS MSOP package?

The exposed thermal pad (EP) on the MCP3426A7T-E/MS is internally connected to VSS and must be soldered to a PCB copper pour tied to the analog ground plane. It reduces thermal resistance (θ_JA = 211°C/W) and improves noise immunity by lowering ground impedance and providing a low-inductance return path for analog currents - critical for achieving specified 10 ppm INL and 2.5 µV_RMS noise performance.

MCP3426A7T-E/MS Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: -

MCP3426A7T-E/MS FAQ

1.How can I place an order for MCP3426A7T-E/MS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A7T-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 MCP3426A7T-E/MS reliable?

The price and inventory of MCP3426A7T-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 MCP3426A7T-E/MS is usually 5 days.

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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 MCP3426A7T-E/MS?

For technical support, including MCP3426A7T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A7T-E/MS requirements.

6.How does Aetrix verify that MCP3426A7T-E/MS is sourced from the original manufacturer or authorized distributors?

All MCP3426A7T-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 MCP3426A7T-E/MS meets industry standards.

7.What is the process for return or replacement of MCP3426A7T-E/MS?

All MCP3426A7T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A7T-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 MCP3426A7T-E/MS part is unused and in its original packaging.

Return procedure for MCP3426A7T-E/MS:

1.Submit a request within 90 days.

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

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