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

Microchip Technology MCP3426A4T-E/MS

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

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Part No.:: MCP3426A4T-E/MS

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3426A4T-E/MS.pdf

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

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Product details

Overview

MCP3426A4T-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, achieves ±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 MCP3426A4T-E/MS datasheet, MCP3426A4T-E/MS pinout, MCP3426A4T-E/MS application, or MCP3426A4T-E/MS 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 MSOP-8 package compatibility with industrial sensor signal chains.

Technical Context

The MCP3426A4T-E/MS implements a delta-sigma modulator with integrated 3.2 pF sampling capacitor, on-chip oscillator, and sinc filter for anti-aliasing. Its dual-channel multiplexer routes CH1+/CH1− and CH2+/CH2− to a shared PGA and ADC core, enabling sequential differential conversions without external switching.

Each conversion triggers automatic offset and gain calibration using the internal 2.048V reference, eliminating need for external calibration routines. The I²C address is factory-programmed (no Adr0/Adr1 pins), distinguishing it from MCP3427/3428 variants, and supports 100 kHz / 400 kHz / 3.4 MHz bus speeds with open-drain SDA/SCL requiring external pull-ups.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution & Data Rate	16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - defines trade-off between noise floor (2.5 µV_RMS) and throughput in battery-powered sensors
Differential Input Range	±2.048V / PGA - full-scale range adjusts with gain setting (e.g., ±256 mV at x8), enabling direct microvolt-level thermocouple digitization
INL Error	±10 ppm of FSR - ensures monotonicity and <0.00025% linearity error over temperature, critical for weigh scale calibration
Supply Current	135 µA typical (continuous, VDD=3V); 0.56 µA typical (one-shot, 12-bit) - enables multi-year operation on coin-cell batteries
Reference Accuracy	2.048V ±0.05% (1024 ppm), 15 ppm/°C drift - eliminates need for external reference in portable instrumentation
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial motor control feedback loops
I²C Compatibility	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes - supports legacy and high-throughput host MCU interfaces

Pinout & Package

The MCP3426A4T-E/MS is housed in an 8-pin MSOP package (3.0 mm × 4.9 mm, 0.65 mm pitch) with exposed thermal pad (EP) internally connected to VSS. Pin 1 is CH1+, pin 2 is CH1−, pin 3 is VSS, pin 4 is VDD, pin 5 is SDA, pin 6 is SCL, pin 7 is CH2+, and pin 8 is CH2−. EP must be soldered to a VSS-connected copper pour for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
CH1+, CH1−	Differential analog input channel 1	Accepts ±2.048V/PGA differential signal; supports single-ended use by tying CH1− to VSS
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; EP ties internally to VSS for thermal dissipation
VDD	Positive supply (2.7–5.5V)	Requires 0.1 µF ceramic + 10 µF tantalum bypassing; POR threshold at 2.2V ±5%
SDA	I²C bidirectional data line	Open-drain output; requires external pull-up (5–10 kΩ for 400 kHz); transmits 16/14/12-bit two's complement codes
SCL	I²C serial clock input	Open-drain compatible; accepts 100 kHz–3.4 MHz clocks; rising edge latches input, falling edge outputs data

Key Features

Feature	Design Value
Self-calibrating offset and gain	Per-conversion correction eliminates system-level calibration routines and compensates for temperature-induced drift
Programmable gain amplifier (x1/x2/x4/x8)	Enables direct digitization of low-level signals (e.g., 125 µV LSB at x8, 16-bit) without external op-amp stages
On-board 2.048V voltage reference	±0.05% initial accuracy and 15 ppm/°C drift replace external references, reducing BOM count and layout area
One-shot conversion mode	Reduces average current to 0.56 µA (12-bit) or 9 µA (16-bit), extending battery life in intermittent-sampling applications
Dual differential input channels	Allows simultaneous monitoring of two isolated sensors (e.g., temperature + pressure) with independent PGA configuration

Applications

RTD Temperature Sensing	Bridge-Based Pressure Transducers
Use Scenario: Measuring resistance change in Pt100/1000 RTDs using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: MCP3426A4T-E/MS acts as the precision front-end ADC, digitizing differential voltage across RTD with PGA gain set to x8 to resolve microvolt-level changes. Use Value: ±10 ppm INL and on-board reference ensure <0.1°C temperature accuracy over –40°C to +125°C without external calibration.	Use Scenario: Reading output of Wheatstone bridge pressure sensors in HVAC and industrial process control. IC Role / Device Role / Timing Role: MCP3426A4T-E/MS performs differential measurements across bridge legs (CH1+/CH1−), rejecting common-mode noise while amplifying mV-level signals. Use Value: 105 dB CMRR at DC and PGA gain matching (<0.1% error between gains) enable stable 0.05% FS pressure accuracy despite supply ripple.
Weigh Scale Load Cell Interface	Battery Fuel Gauging
Use Scenario: Converting millivolt outputs from strain-gauge load cells into digital weight values for retail or industrial scales. IC Role / Device Role / Timing Role: MCP3426A4T-E/MS serves as the primary ADC, using CH2+/CH2− for bridge excitation monitoring and CH1+/CH1− for load cell output. Use Value: 16-bit resolution at 15 SPS provides >100,000-count readability with <10 ppm INL, meeting OIML R76 Class III requirements.	Use Scenario: Monitoring battery pack voltage and current sense resistor voltage in portable medical devices and power tools. IC Role / Device Role / Timing Role: MCP3426A4T-E/MS digitizes shunt voltage (CH1+/CH1−) and battery voltage (CH2+/CH2−) in one-shot mode to minimize quiescent current. Use Value: 0.56 µA standby current (12-bit) and 2.5 µV_RMS noise enable accurate state-of-charge estimation over multi-year device lifetime.

RTD Temperature Sensing

Bridge-Based Pressure Transducers

Use Scenario: Measuring resistance change in Pt100/1000 RTDs using constant-current excitation and ratiometric ADC conversion.

IC Role / Device Role / Timing Role: MCP3426A4T-E/MS acts as the precision front-end ADC, digitizing differential voltage across RTD with PGA gain set to x8 to resolve microvolt-level changes.

Use Value: ±10 ppm INL and on-board reference ensure <0.1°C temperature accuracy over –40°C to +125°C without external calibration.

Use Scenario: Reading output of Wheatstone bridge pressure sensors in HVAC and industrial process control.

IC Role / Device Role / Timing Role: MCP3426A4T-E/MS performs differential measurements across bridge legs (CH1+/CH1−), rejecting common-mode noise while amplifying mV-level signals.

Use Value: 105 dB CMRR at DC and PGA gain matching (<0.1% error between gains) enable stable 0.05% FS pressure accuracy despite supply ripple.

Weigh Scale Load Cell Interface

Battery Fuel Gauging

Use Scenario: Converting millivolt outputs from strain-gauge load cells into digital weight values for retail or industrial scales.

IC Role / Device Role / Timing Role: MCP3426A4T-E/MS serves as the primary ADC, using CH2+/CH2− for bridge excitation monitoring and CH1+/CH1− for load cell output.

Use Value: 16-bit resolution at 15 SPS provides >100,000-count readability with <10 ppm INL, meeting OIML R76 Class III requirements.

Use Scenario: Monitoring battery pack voltage and current sense resistor voltage in portable medical devices and power tools.

IC Role / Device Role / Timing Role: MCP3426A4T-E/MS digitizes shunt voltage (CH1+/CH1−) and battery voltage (CH2+/CH2−) in one-shot mode to minimize quiescent current.

Use Value: 0.56 µA standby current (12-bit) and 2.5 µV_RMS noise enable accurate state-of-charge estimation over multi-year device lifetime.

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; 16-bit @ 860 SPS; higher noise (150 nV_RMS)	Supports 4 inputs without external mux but lacks self-calibration - needs periodic system calibration	Select when higher throughput or 4-channel count outweighs need for autonomous calibration and integrated reference
MCP3421A0T-E/CH	Single-channel, same PGA/ref/I²C architecture; identical 16-bit performance and 0.56 µA one-shot current	Limited to one sensor; simpler layout but requires duplication for dual-sensor systems	Select for space-constrained single-input designs where MSOP-8 footprint and ultra-low power are prioritized over channel count

Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the MCP3426A4T-E/MS uniquely balances dual-channel capability, factory-fixed I²C address, autonomous calibration, and integrated reference - making it optimal for compact, maintenance-free sensor nodes requiring two precision analog inputs.

Availability

MCP3426A4T-E/MS is available at Aetrix Electronics and suitable for RTD temperature sensing, bridge-based pressure transducers, weigh scale load cell interfaces, battery fuel gauging, and factory automation equipment requiring stable component supply across extended temperature ranges.

Supply support for MCP3426A4T-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, 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 portable and embedded systems - emphasizing integrated references, self-calibration, and I²C simplicity over raw speed.

FAQ

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

The MCP3426A4T-E/MS has its I²C address permanently programmed during manufacturing and does not feature external address selection pins (Adr0/Adr1). Its default 7-bit address is 1001000 (0x48) in standard mode, confirmed in Microchip's DS22226A datasheet Section 5.3.1. This fixed addressing simplifies bus arbitration in multi-device systems but requires careful address mapping during schematic design to avoid conflicts with other I²C peripherals.

How does the MCP3426A4T-E/MS achieve ±10 ppm INL over temperature?

The MCP3426A4T-E/MS achieves ±10 ppm INL through a combination of on-chip trimming during production, matched transistor layouts in the delta-sigma modulator, and per-conversion self-calibration that corrects offset and gain errors using the internal 2.048V reference. This calibration occurs automatically before each conversion, ensuring linearity remains within specification across –40°C to +125°C without external intervention - a key differentiator from non-calibrating ADCs.

Can the MCP3426A4T-E/MS operate with a 2.7V supply in 16-bit mode?

Yes, the MCP3426A4T-E/MS fully supports 2.7V to 5.5V single-supply operation in all modes, including 16-bit resolution at 15 SPS. At VDD = 2.7V, typical supply current is 135 µA in continuous mode and 9 µA in one-shot 16-bit mode (DS22226A-page 5). The internal reference remains stable, and the full ±2.048V/PGA input range is preserved, enabling low-voltage battery-powered deployments without performance compromise.

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

The exposed thermal pad (EP) on the MCP3426A4T-E/MS MSOP package is internally connected to VSS and serves dual purposes: thermal dissipation (reducing θ_JA from 211°C/W to ~150°C/W when properly soldered) and electrical grounding. It must be soldered to a VSS-connected copper pour on the PCB; floating or unconnected EP degrades thermal performance and may introduce ground noise coupling into analog inputs, directly impacting INL and noise specifications.

Does the MCP3426A4T-E/MS support single-ended input configurations?

Yes, the MCP3426A4T-E/MS supports single-ended operation by connecting either CH1− or CH2− to VSS, using CH1+ or CH2+ as the signal input. However, this sacrifices common-mode rejection and reduces effective resolution by half the differential range (e.g., 0–2.048V instead of ±2.048V). The datasheet explicitly permits this in Section 3.1 and Figure 6-4, but differential mode is recommended for noise-sensitive applications like RTD or bridge sensing.

MCP3426A4T-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:: -

MCP3426A4T-E/MS FAQ

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

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

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

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

Once your MCP3426A4T-E/MS 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/MS?

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

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

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

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

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

Return procedure for MCP3426A4T-E/MS:

1.Submit a request within 90 days.

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

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