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

Microchip Technology MCP3426A1T-E/SN

Name: MCP3426A1T-E/SN
Brand: Microchip Technology
SKU: MCP3426A1T-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A1T-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3426A1T-E/SN.pdf

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

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Product details

Overview

MCP3426A1T-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/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 for precision sensor signal acquisition in industrial and portable instrumentation.

For engineers reviewing the MCP3426A1T-E/SN datasheet, MCP3426A1T-E/SN pinout, MCP3426A1T-E/SN application, or MCP3426A1T-E/SN equivalent, key selection considerations include its factory-programmed I²C address, 8-pin SOIC/MSOP/DFN package compatibility, self-calibrating offset/gain per conversion, and differential input full-scale range of ±2.048V/PGA - critical for RTD, thermocouple, and bridge-based measurement systems requiring stable low-drift performance.

Technical Context

The MCP3426A1T-E/SN integrates a switched-capacitor delta-sigma modulator with internal oscillator, 2.048V reference, and PGA front-end, enabling direct high-resolution digitization of low-level analog signals without external components. Its differential input structure supports both differential and single-ended configurations, with input impedance of 2.25 MΩ/PGA during conversion.

Conversion is controlled via I²C-configurable bits for resolution (12/14/16-bit), channel selection (CH1/CH2), PGA gain, and mode (one-shot/continuous). Each conversion includes automatic offset and gain calibration, ensuring stability over temperature and supply variation without host intervention.

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 number of bits and noise floor trade-off.
Differential Input Range	±2.048V / PGA - sets maximum measurable voltage difference between CHn+ and CHn− pins.
INL	10 ppm of full scale range - ensures linearity error ≤ ±0.001% FSR at 16-bit mode, critical for calibrated measurement accuracy.
On-board Reference	2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external reference; enables absolute accuracy without trimming.
Supply Current	135 µA typical (3V, continuous); 9 µA typical (3V, one-shot 16-bit) - enables battery-powered operation with ultra-low idle power.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible system integration with microcontrollers across speed tiers.
Operating Temp	–40°C to +125°C - qualified for automotive under-hood, industrial control, and harsh-environment applications.

Pinout & Package

The MCP3426A1T-E/SN is available in 8-pin SOIC, MSOP, and 2×3 DFN packages with exposed thermal pad (EP), all sharing identical pin mapping and electrical behavior. The EP must be connected to VSS for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Differential analog input, channel 1 positive	Accepts signal referenced to CH1−; supports single-ended use when CH1− tied to VSS.
CH1−	Differential analog input, channel 1 negative	Common-mode reference for CH1+; defines differential input voltage as CH1+ − CH1−.
CH2+	Differential analog input, channel 2 positive	Second independent measurement path; shares same PGA and ADC core as CH1.
CH2−	Differential analog input, channel 2 negative	Enables true differential sensing on second channel; no crosstalk with CH1 in default configuration.
VSS	Analog/digital ground reference	Low-impedance return path; must connect EP and PCB ground plane directly to minimize noise coupling.
VDD	Power supply input	2.7V–5.5V single supply; requires 0.1 µF ceramic + 10 µF tantalum bypassing per datasheet layout guidance.
SDA	I²C bidirectional data line	Open-drain output/input; requires external pull-up (5–10 kΩ) to VDD for standard/fast mode operation.
SCL	I²C serial clock input	Open-drain input only; clock edges drive internal state machine; pull-up resistor mandatory.

Key Features

Feature	Design Value
Self-calibrating offset and gain	Per-conversion correction eliminates need for system-level calibration routines and maintains accuracy across temperature and supply shifts.
Programmable gain amplifier (x1/x2/x4/x8)	Enables direct digitization of sub-millivolt signals (e.g., thermocouples) without external amplification, reducing BOM and layout complexity.
On-board 2.048V reference	Provides stable, low-drift reference source; removes dependency on external references and associated layout sensitivity.
One-shot conversion mode	Reduces average current to ≤9 µA (16-bit) during idle periods - essential for energy-constrained portable and wireless sensor nodes.
Differential input architecture	Rejects common-mode noise up to 110 dB (PGA=8), improving immunity in electrically noisy industrial environments.

Applications

Temperature Sensing	Bridge-Based Sensing
Use Scenario: Measuring resistance changes in Pt100 RTDs or NTC thermistors using constant-current excitation and ratiometric conversion. IC Role / Device Role / Timing Role: Precision 16-bit ADC digitizes differential voltage across sensor; internal reference enables ratiometric accuracy immune to supply variation. Use Value: Achieves <±0.1°C accuracy over –40°C to +125°C without external calibration, leveraging 10 ppm INL and 15 ppm/°C reference drift.	Use Scenario: Reading output of Wheatstone bridge pressure or load cells with mV-level full-scale signals. IC Role / Device Role / Timing Role: PGA amplifies weak bridge outputs (e.g., 20 mV FS) by ×8 before 16-bit conversion, maximizing dynamic range utilization. Use Value: Delivers >100 dB SNR at 15 SPS, resolving sub-µV changes - sufficient for 0.01% FS weighing scale resolution.
Weigh Scales	Battery Fuel Gauging
Use Scenario: High-precision industrial weigh scales requiring 1:100,000 resolution and long-term stability. IC Role / Device Role / Timing Role: Two-channel differential inputs support simultaneous bridge excitation monitoring and sensor reading, enabling real-time offset compensation. Use Value: Self-calibration per conversion ensures repeatability better than 0.005% FS over time and temperature, meeting OIML R76 Class III requirements.	Use Scenario: Monitoring battery cell voltage and current sense shunt in portable medical devices or IoT edge nodes. IC Role / Device Role / Timing Role: One-shot mode samples voltage/current at user-defined intervals (e.g., every 10 s), minimizing quiescent current to extend battery life. Use Value: 9 µA typical consumption (3V, 16-bit one-shot) enables >10-year operation on coin-cell batteries in maintenance-free deployments.

Temperature Sensing

Bridge-Based Sensing

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

IC Role / Device Role / Timing Role: Precision 16-bit ADC digitizes differential voltage across sensor; internal reference enables ratiometric accuracy immune to supply variation.

Use Value: Achieves <±0.1°C accuracy over –40°C to +125°C without external calibration, leveraging 10 ppm INL and 15 ppm/°C reference drift.

Use Scenario: Reading output of Wheatstone bridge pressure or load cells with mV-level full-scale signals.

IC Role / Device Role / Timing Role: PGA amplifies weak bridge outputs (e.g., 20 mV FS) by ×8 before 16-bit conversion, maximizing dynamic range utilization.

Use Value: Delivers >100 dB SNR at 15 SPS, resolving sub-µV changes - sufficient for 0.01% FS weighing scale resolution.

Weigh Scales

Battery Fuel Gauging

Use Scenario: High-precision industrial weigh scales requiring 1:100,000 resolution and long-term stability.

IC Role / Device Role / Timing Role: Two-channel differential inputs support simultaneous bridge excitation monitoring and sensor reading, enabling real-time offset compensation.

Use Value: Self-calibration per conversion ensures repeatability better than 0.005% FS over time and temperature, meeting OIML R76 Class III requirements.

Use Scenario: Monitoring battery cell voltage and current sense shunt in portable medical devices or IoT edge nodes.

IC Role / Device Role / Timing Role: One-shot mode samples voltage/current at user-defined intervals (e.g., every 10 s), minimizing quiescent current to extend battery life.

Use Value: 9 µA typical consumption (3V, 16-bit one-shot) enables >10-year operation on coin-cell batteries in maintenance-free deployments.

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; internal reference ±0.5%; no auto-calibration; 10 ppm/°C drift	Higher speed but lower DC accuracy; lacks per-conversion self-calibration and tighter reference spec	Prefer ADS1115IDGSR where multi-channel count or throughput outweighs long-term drift and INL requirements.
MCP3421A0T-E/OT	Single-channel, 18-bit, 15 SPS; same 2.048V reference and PGA; factory-set I²C address (0x68)	Higher resolution but no second channel; identical power profile and calibration architecture	Choose MCP3421A0T-E/OT when single-input precision exceeds dual-channel need and 18-bit resolution is mandatory.

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A1T-E/SN uniquely balances dual-channel capability, guaranteed 10 ppm INL, and per-conversion self-calibration - making it optimal for cost-sensitive, space-constrained industrial sensors where channel density and long-term accuracy coexist.

Availability

MCP3426A1T-E/SN is available at Aetrix Electronics and suitable for industrial automation equipment, portable instrumentation, and battery-powered sensor nodes requiring stable component supply, extended temperature operation, and verified long-term parametric consistency.

Supply support for MCP3426A1T-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 microcontroller, mixed-signal, analog, 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 applications - emphasizing integrated reference, PGA, and self-calibration to reduce system-level design burden.

FAQ

What is the factory-programmed I²C address of the MCP3426A1T-E/SN?

The MCP3426A1T-E/SN has its I²C address permanently programmed at the factory - unlike the MCP3427/MCP3428 variants which use external Adr0/Adr1 pins. Its fixed 7-bit address is 0x68 (1101000b), corresponding to the "A1" suffix in the part number. This simplifies system integration by eliminating external address configuration components and reduces PCB routing complexity in multi-device I²C buses.

Does the MCP3426A1T-E/SN require external calibration for production use?

No, the MCP3426A1T-E/SN performs automatic offset and gain calibration before each conversion, eliminating the need for external calibration in production. This self-calibration uses the internal 2.048V reference and ensures that errors due to temperature drift, supply variation, and aging remain within datasheet limits (e.g., 10 ppm INL at 15 SPS) without host firmware intervention or factory trim steps.

Can the MCP3426A1T-E/SN operate from a 3.3V supply while maintaining full 16-bit performance?

Yes, the MCP3426A1T-E/SN fully supports 3.3V operation with guaranteed 16-bit performance: 15 SPS data rate, 10 ppm INL, and ±2.048V/PGA differential input range are all specified down to VDD = 2.7V. At 3.3V, typical supply current is 135 µA in continuous mode and 9 µA in one-shot 16-bit mode - matching datasheet values and enabling direct integration into 3.3V microcontroller systems.

How does the exposed thermal pad (EP) on the MCP3426A1T-E/SN DFN package affect thermal performance?

The exposed thermal pad (EP) on the MCP3426A1T-E/SN DFN variant provides a low-thermal-resistance path from the die to the PCB ground plane, reducing θJA to 84.5°C/W. It must be soldered directly to a VSS-connected copper pour; failure to do so degrades thermal performance and risks exceeding junction temperature limits under sustained conversion loads - especially at 5.5V or +125°C ambient.

Is the MCP3426A1T-E/SN compatible with high-speed I²C mode (3.4 MHz)?

Yes, the MCP3426A1T-E/SN supports high-speed I²C mode up to 3.4 MHz, as confirmed in the DS22226A datasheet Section 1.0. To achieve this, pull-up resistors on SDA and SCL must be ≤1 kΩ, PCB trace capacitance must stay below 400 pF, and the master controller must comply with high-speed timing requirements - enabling rapid register access and reduced command latency in time-critical sensor polling loops.

MCP3426A1T-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3426A1T-E/SN FAQ

1.How can I place an order for MCP3426A1T-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A1T-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 MCP3426A1T-E/SN reliable?

The price and inventory of MCP3426A1T-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 MCP3426A1T-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3426A1T-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A1T-E/SN transactions.

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4.How is shipping managed for MCP3426A1T-E/SN?

MCP3426A1T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3426A1T-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 MCP3426A1T-E/SN?

For technical support, including MCP3426A1T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A1T-E/SN requirements.

6.How does Aetrix verify that MCP3426A1T-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3426A1T-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 MCP3426A1T-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3426A1T-E/SN?

All MCP3426A1T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A1T-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 MCP3426A1T-E/SN part is unused and in its original packaging.

Return procedure for MCP3426A1T-E/SN:

1.Submit a request within 90 days.

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

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