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Microchip Technology MCP3426A5T-E/MS
- Part No.:
- MCP3426A5T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP3426A5T-E/MS.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,621
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Product details
Overview
MCP3426A5T-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 supply across –40°C to +125°C - used in precision RTD-based temperature sensing and bridge transducer readout.
For engineers reviewing the MCP3426A5T-E/MS datasheet, MCP3426A5T-E/MS pinout, MCP3426A5T-E/MS application, or MCP3426A5T-E/MS equivalent, key selection factors include its factory-programmed I²C address, MSOP-8 package with exposed thermal pad, self-calibrating offset/gain per conversion, and differential input full-scale range of ±2.048V/PGA.
Technical Context
The MCP3426A5T-E/MS implements a delta-sigma modulator with integrated sinc³ digital filter, on-chip oscillator, and automatic per-conversion offset/gain calibration. Its input stage uses a 3.2 pF sampling capacitor switched at rates determined by selected data rate (15/60/240 SPS), enabling high-resolution measurement without external clocking.
It features a fixed, factory-programmed I²C address (no Adr0/Adr1 pins), supports one-shot and continuous conversion modes, and maintains <1 µA standby current. The PGA gain setting directly scales both input range and differential input impedance (2.25 MΩ/PGA), impacting source impedance sensitivity and anti-aliasing design.
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 and update latency |
| Differential Input Range | ±2.048V / PGA - sets maximum measurable signal before saturation (e.g., ±256 mV at PGA=8) |
| INL | 10 ppm of full scale - ensures linearity error ≤ ±0.66 LSB at 16-bit resolution |
| On-board Reference | 2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external reference and reduces BOM count |
| Supply Current | 135 µA typical (3V, continuous); 0.56 µA typical (3V, 12-bit one-shot) - enables battery-powered portable instrumentation |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood sensor interfaces |
| I²C Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration |
Pinout & Package
Package: 8-pin MSOP with exposed thermal pad (EP), pin-compatible with SOIC-8 and 2×3 DFN variants. EP must be soldered to VSS for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Positive differential analog input, Channel 1 | Accepts signal referenced to CH1−; supports single-ended use when CH1− tied to VSS |
| CH1− | Negative differential analog input, Channel 1 | Common-mode reference for CH1+; enables rejection of shared noise in bridge/RTD circuits |
| CH2+ | Positive differential analog input, Channel 2 | Second independent measurement path; identical specs to CH1+ for dual-sensor applications |
| CH2− | Negative differential analog input, Channel 2 | Enables true differential measurement on second channel without shared ground errors |
| VSS | Analog/digital ground reference | Must connect to low-impedance analog ground plane; EP internally tied to VSS |
| VDD | Positive supply (2.7–5.5V) | Requires local 0.1 µF ceramic + optional 10 µF tantalum bypass for noise immunity |
| SDA | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ for standard/fast mode) |
| SCL | I²C serial clock input | Open-drain input; clock edges control data sampling and output timing |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset & gain | Per-conversion correction eliminates drift-induced errors without host intervention or calibration routines |
| Programmable gain amplifier (x1/x2/x4/x8) | Extends effective dynamic range: enables 16-bit resolution on sub-256 mV differential signals (e.g., thermocouple outputs) |
| On-board 2.048V reference | Removes external reference dependency and associated layout sensitivity; ±0.05% initial accuracy meets Class I metrology needs |
| One-shot conversion mode | Reduces average current to ≤0.56 µA (12-bit) - ideal for wake-on-event sensor nodes with microcontroller-controlled polling |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), critical for noisy industrial environments and long sensor traces |
Applications
| Temperature Sensing | Bridge Transducer Readout |
|---|---|
Use Scenario: Measuring resistance change in Pt100 RTDs using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Precision 16-bit differential ADC digitizing voltage across RTD; internal reference enables ratiometric accuracy immune to supply variation. Use Value: Achieves ±0.1°C temperature resolution over –40°C to +125°C with no external reference or calibration. |
Use Scenario: Reading output of Wheatstone bridge pressure sensors in HVAC and industrial process control. IC Role / Device Role / Timing Role: High-accuracy differential front-end converting mV-level bridge imbalance into digital values with 10 ppm INL. Use Value: Enables <100 ppm total system error including sensor nonlinearity, amplifier offset, and ADC quantization. |
| Weigh Scale Load Cell Interface | Battery Fuel Gauge Monitoring |
Use Scenario: Digitizing low-level mV outputs from strain-gauge load cells in platform scales and industrial weighing systems. IC Role / Device Role / Timing Role: PGA-configurable ADC providing 16-bit resolution at 15 SPS with self-calibration to maintain accuracy across temperature swings. Use Value: Supports 1:10,000+ weight resolution (e.g., 0.1 g on 1 kg scale) without external amplification or trimming. |
Use Scenario: Monitoring cell voltage and current sense shunt voltage in lithium-ion battery packs for state-of-charge estimation. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously sampling voltage and current with matched gain/offset tracking via shared PGA and reference. Use Value: Enables coulomb counting with <1% accumulated charge error over full discharge cycle due to correlated gain stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel, 16-bit, but lacks on-board reference; requires external 2.048V ref or uses VDD as reference | Higher channel count but lower absolute accuracy without calibrated reference; less suitable for ratiometric RTD sensing | Select MCP3426A5T-E/MS when reference stability and self-calibration are required over raw channel count |
| MCP3421A5T-E/MS | Single-channel variant with identical specs, same MSOP-8 package and I²C address scheme | Used where only one sensor channel is needed; shares same PCB footprint and firmware register map | Choose MCP3426A5T-E/MS when dual independent differential inputs are required without redesigning layout or driver code |
Compared with ADS1115IDGSR, MCP3426A5T-E/MS delivers guaranteed 2.048V reference accuracy and per-conversion calibration - eliminating system-level drift compensation. Against MCP3421A5T-E/MS, it doubles channel capacity while retaining identical power, size, and software compatibility.
Availability
MCP3426A5T-E/MS is available at Aetrix Electronics and suitable for precision temperature sensing, bridge transducer readout, and battery fuel gauge monitoring requiring stable component supply across industrial, test equipment, and medical device production cycles.
Supply support for MCP3426A5T-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, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in space-constrained industrial and portable applications - emphasizing integrated reference, self-calibration, and I²C simplicity.
FAQ
What is the factory-programmed I²C address of the MCP3426A5T-E/MS?
The MCP3426A5T-E/MS has a fixed, factory-programmed I²C address of 0x68 (1101000b). Unlike the MCP3427/3428, it does not feature Adr0/Adr1 pins - eliminating external address configuration but ensuring deterministic bus addressing in multi-device systems. This address is confirmed in Microchip's DS22226A datasheet Section 5.3.1.
Does the MCP3426A5T-E/MS require an external voltage reference?
No, the MCP3426A5T-E/MS integrates a 2.048V ±0.05% voltage reference with 15 ppm/°C drift, eliminating the need for an external reference. This on-board reference sets the full-scale differential input range as ±2.048V/PGA and is used for all conversions - simplifying layout and improving system-level accuracy in ratiometric measurements.
How does the self-calibration function work in the MCP3426A5T-E/MS?
The MCP3426A5T-E/MS performs full offset and gain calibration automatically before each conversion - not just at power-up. This corrects for temperature-induced drift and supply voltage fluctuations in real time, delivering consistent 10 ppm INL performance across –40°C to +125°C without host-initiated calibration commands or external circuitry.
What is the role of the exposed thermal pad (EP) on the MCP3426A5T-E/MS MSOP-8 package?
The exposed thermal pad (EP) on the MCP3426A5T-E/MS is electrically connected to VSS and must be soldered to a VSS copper pour on the PCB. It reduces thermal resistance (θJA = 211°C/W) and improves long-term reliability under sustained conversion loads - especially critical in high-temperature industrial environments where junction temperature must remain below 150°C.
Can the MCP3426A5T-E/MS operate in single-ended mode?
Yes, the MCP3426A5T-E/MS supports single-ended operation: tie CH1− or CH2− to VSS and apply the signal to CH1+ or CH2+. However, this sacrifices common-mode noise rejection and reduces effective resolution by ~3 bits compared to true differential mode - making it suitable only for low-noise, low-impedance sources where differential wiring is impractical.
MCP3426A5T-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:
- -
MCP3426A5T-E/MS FAQ
1.How can I place an order for MCP3426A5T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A5T-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 MCP3426A5T-E/MS reliable?
The price and inventory of MCP3426A5T-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 MCP3426A5T-E/MS is usually 5 days.
3.What payment methods are accepted for MCP3426A5T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A5T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A5T-E/MS?
MCP3426A5T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A5T-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 MCP3426A5T-E/MS?
For technical support, including MCP3426A5T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A5T-E/MS requirements.
6.How does Aetrix verify that MCP3426A5T-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP3426A5T-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 MCP3426A5T-E/MS meets industry standards.
7.What is the process for return or replacement of MCP3426A5T-E/MS?
All MCP3426A5T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A5T-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 MCP3426A5T-E/MS part is unused and in its original packaging.
Return procedure for MCP3426A5T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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