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

Microchip Technology MCP3426A4T-E/SN

Name: MCP3426A4T-E/SN
Brand: Microchip Technology
SKU: MCP3426A4T-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3426A4T-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3426A4T-E/SN.pdf

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

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Product details

Overview

MCP3426A4T-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 for precision sensor signal acquisition in industrial instrumentation.

For engineers reviewing the MCP3426A4T-E/SN datasheet, MCP3426A4T-E/SN pinout, MCP3426A4T-E/SN application, or MCP3426A4T-E/SN equivalent, key selection factors include its factory-programmed I²C address, 8-pin SOIC package with exposed thermal pad, self-calibrating offset/gain per conversion, and low 9 µA typical standby current in one-shot 16-bit mode - critical for battery-powered measurement systems.

Technical Context

The MCP3426A4T-E/SN implements a delta-sigma modulation architecture with integrated 3.2 pF sampling capacitor, on-chip oscillator, and sinc-based digital filter. Its differential input structure supports both differential and single-ended configurations, with input impedance scaling inversely with PGA gain (2.25 MΩ/PGA).

Each conversion triggers automatic offset and gain calibration using the internal 2.048V reference, ensuring stability over temperature (±50 nV/°C offset drift) and supply variation (5 ppm/V gain vs. VDD). The device defaults to 12-bit continuous mode at power-up but supports user-configurable resolution (12/14/16-bit), channel selection (CH1/CH2), and conversion mode (one-shot/continuous) via I²C register writes.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution & Data Rate	16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - enables trade-off between noise floor and throughput without external filtering
Differential Input Range	±2.048V / PGA - full-scale range adjusts with gain setting (e.g., ±256 mV at PGA=8), supporting microvolt-level signals
INL Error	10 ppm of FSR - ensures ≤±0.001% linearity error across full scale, critical for calibration-grade measurements
Reference Accuracy	2.048V ±0.05% (±1.024 mV) - eliminates need for external reference in most precision applications
Supply Current	135 µA typical (3V, continuous); 9 µA typical (3V, one-shot 16-bit) - enables multi-year operation on coin-cell batteries
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial control environments
I²C Interface Speed	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - compatible with legacy and high-throughput host controllers

Pinout & Package

The MCP3426A4T-E/SN is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm) with exposed thermal pad (EP) internally connected to VSS. The EP must be soldered to a PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Differential analog input, channel 1 positive	Accepts voltage up to VDD+0.3V; used with CH1− for true differential sensing or with 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; leakage occurs outside this range due to ESD diodes
CH2+	Differential analog input, channel 2 positive	Independent second channel; identical electrical specs to CH1+, supports time-multiplexed dual-sensor acquisition
CH2−	Differential analog input, channel 2 negative	Paired with CH2+; no crosstalk between CH1 and CH2 paths per datasheet characterization
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP is internally tied to VSS and requires PCB thermal via connection
VDD	Positive supply (2.7V–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
SCL	I²C serial clock input	Open-drain input; accepts external clock edges; timing compliant with I²C specification up to 3.4 MHz

Key Features

Feature	Design Value
Self-calibrating offset and gain	Per-conversion calibration eliminates system-level recalibration needs and maintains accuracy across –40°C to +125°C
Programmable gain amplifier (x1/x2/x4/x8)	Enables direct digitization of µV-level thermocouple or bridge outputs without external op-amp stages
On-board 2.048V voltage reference	15 ppm/°C drift and ±0.05% initial accuracy remove dependency on external references and reduce BOM count
One-shot conversion mode	Reduces average current to sub-µA levels during idle periods - essential for energy harvesting and portable instrumentation
Differential input architecture	105–110 dB common-mode rejection suppresses noise in noisy industrial environments without external instrumentation amps

Applications

Temperature Sensing	Bridge-Based Transducers
Use Scenario: Measuring RTD resistance changes in HVAC control panels with ambient temperature ranging from –25°C to +70°C. IC Role / Device Role / Timing Role: ADC front-end converting differential voltage from 4-wire RTD circuit into 16-bit digital values at 15 SPS for high-resolution linearization. Use Value: 10 ppm INL and on-chip reference ensure <±0.1°C absolute accuracy without factory calibration, reducing test time and cost.	Use Scenario: Reading output of a 350 Ω strain gauge in structural health monitoring sensors deployed on bridges. IC Role / Device Role / Timing Role: Precision digitizer for low-level mV-level bridge excitation signals, leveraging PGA x8 to maximize SNR before quantization. Use Value: Differential input and 110 dB CMRR reject common-mode noise from long cable runs, eliminating need for shielded twisted pairs.
Weigh Scales	Battery Fuel Gauging
Use Scenario: Industrial platform scale measuring loads from 10 g to 50 kg using load cell with 2 mV/V sensitivity. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring simultaneous zero and span readings to compensate for thermal drift in load cell output. Use Value: Factory-programmed I²C address simplifies multi-device daisy-chaining on same bus, enabling compact multi-load-cell designs.	Use Scenario: Monitoring lithium-ion battery pack voltage and current sense resistor voltage in portable medical devices. IC Role / Device Role / Timing Role: Low-power ADC performing periodic one-shot conversions on shunt voltage to calculate state-of-charge with minimal quiescent draw. Use Value: 9 µA typical standby current in 16-bit one-shot mode extends battery life by >3× versus continuous-sampling alternatives.

Temperature Sensing

Bridge-Based Transducers

Use Scenario: Measuring RTD resistance changes in HVAC control panels with ambient temperature ranging from –25°C to +70°C.

IC Role / Device Role / Timing Role: ADC front-end converting differential voltage from 4-wire RTD circuit into 16-bit digital values at 15 SPS for high-resolution linearization.

Use Value: 10 ppm INL and on-chip reference ensure <±0.1°C absolute accuracy without factory calibration, reducing test time and cost.

Use Scenario: Reading output of a 350 Ω strain gauge in structural health monitoring sensors deployed on bridges.

IC Role / Device Role / Timing Role: Precision digitizer for low-level mV-level bridge excitation signals, leveraging PGA x8 to maximize SNR before quantization.

Use Value: Differential input and 110 dB CMRR reject common-mode noise from long cable runs, eliminating need for shielded twisted pairs.

Weigh Scales

Battery Fuel Gauging

Use Scenario: Industrial platform scale measuring loads from 10 g to 50 kg using load cell with 2 mV/V sensitivity.

IC Role / Device Role / Timing Role: Dual-channel ADC acquiring simultaneous zero and span readings to compensate for thermal drift in load cell output.

Use Value: Factory-programmed I²C address simplifies multi-device daisy-chaining on same bus, enabling compact multi-load-cell designs.

Use Scenario: Monitoring lithium-ion battery pack voltage and current sense resistor voltage in portable medical devices.

IC Role / Device Role / Timing Role: Low-power ADC performing periodic one-shot conversions on shunt voltage to calculate state-of-charge with minimal quiescent draw.

Use Value: 9 µA typical standby current in 16-bit one-shot mode extends battery life by >3× versus continuous-sampling alternatives.

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	Supports alert pin and window comparator mode; lacks self-calibration and higher INL (15 ppm)	Choose when multi-channel monitoring with interrupt-driven events is prioritized over absolute accuracy
MCP3421A0T-E/OT	Single-channel variant; identical PGA, reference, and calibration architecture; same 8-pin SOT-23 package	Lower pin count and smaller footprint; no second analog input channel	Choose when only one sensor channel is needed and board space is constrained

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A4T-E/SN uniquely combines dual differential channels, factory-fixed I²C address, and guaranteed 10 ppm INL with self-calibration - making it optimal for space-constrained, high-accuracy dual-sensor systems where reference stability and long-term repeatability are non-negotiable.

Availability

MCP3426A4T-E/SN is available at Aetrix Electronics and suitable for industrial instrumentation, battery-powered portable diagnostics, and automotive cabin temperature control requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MCP3426A4T-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 components, 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 applications - emphasizing integrated reference, self-calibration, and robust I²C communication.

FAQ

What is the factory-programmed I²C address of the MCP3426A4T-E/SN?

The MCP3426A4T-E/SN has its I²C address permanently programmed at the factory and cannot be modified by external pins. Its fixed 7-bit address is 1001000 (0x48) in standard notation, allowing direct integration into I²C buses without address conflicts from floating pins - unlike the MCP3427/3428 which use Adr0/Adr1 pins for address selection. This simplifies firmware initialization and eliminates external pull-up/down resistors for address configuration.

Does the MCP3426A4T-E/SN require an external voltage reference?

No, the MCP3426A4T-E/SN does not require an external voltage reference. It integrates a precision 2.048V ±0.05% on-board reference with 15 ppm/°C drift, which serves as the conversion基准 for all differential input measurements. This internal reference is used exclusively by the ADC core and is not accessible at any pin - eliminating BOM cost, layout area, and calibration complexity associated with external references while maintaining 10 ppm INL performance.

How does the MCP3426A4T-E/SN handle input overvoltage conditions?

The MCP3426A4T-E/SN protects against input overvoltage via on-chip ESD diodes on each analog input pin (CH1±, CH2±), rated for ≥6 kV HBM. However, voltages exceeding VSS–0.3V or VDD+0.3V forward-bias these diodes, causing leakage current that degrades accuracy or risks permanent damage. The device outputs saturated codes (0x8000 or 0x7FFF) if |(CHn+ − CHn−) × PGA| > 2.048V, signaling overrange without latch-up - requiring external clamping or attenuation for inputs beyond absolute maximum ratings.

Can the MCP3426A4T-E/SN operate in single-ended mode?

Yes, the MCP3426A4T-E/SN supports single-ended operation by connecting CHn− to VSS (ground) while applying the signal to CHn+. This configuration uses half the differential full-scale range (±2.048V/PGA becomes 0–2.048V/PGA for unipolar signals), reducing effective resolution by 1 bit compared to true differential mode. Single-ended mode retains all other specifications - including INL, noise, and self-calibration - and is commonly used with grounded sensors like thermistors or potentiometers where common-mode rejection is unnecessary.

What is the purpose of the exposed thermal pad (EP) on the MCP3426A4T-E/SN SOIC package?

The exposed thermal pad (EP) on the MCP3426A4T-E/SN SOIC package is internally connected to VSS and serves dual purposes: thermal dissipation and electrical grounding. It must be soldered to a PCB copper pour tied to the analog ground plane using multiple thermal vias. Proper EP connection reduces junction-to-board thermal resistance by ~30%, preventing thermal drift in high-accuracy measurements and ensuring stable operation at +125°C ambient - especially critical during continuous conversion at elevated supply voltages.

MCP3426A4T-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:: -

MCP3426A4T-E/SN FAQ

1.How can I place an order for MCP3426A4T-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3426A4T-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 MCP3426A4T-E/SN reliable?

The price and inventory of MCP3426A4T-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 MCP3426A4T-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3426A4T-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A4T-E/SN transactions.

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4.How is shipping managed for MCP3426A4T-E/SN?

MCP3426A4T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3426A4T-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 MCP3426A4T-E/SN?

For technical support, including MCP3426A4T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A4T-E/SN requirements.

6.How does Aetrix verify that MCP3426A4T-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3426A4T-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 MCP3426A4T-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3426A4T-E/SN?

All MCP3426A4T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A4T-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 MCP3426A4T-E/SN part is unused and in its original packaging.

Return procedure for MCP3426A4T-E/SN:

1.Submit a request within 90 days.

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

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