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Microchip Technology MCP3426A3T-E/MC
- Part No.:
- MCP3426A3T-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3426A3T-E/MC.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
MCP3426A3T-E/MC 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 over –40°C to +125°C - used in precision bridge sensing and RTD-based temperature measurement systems.
For engineers reviewing the MCP3426A3T-E/MC datasheet, MCP3426A3T-E/MC pinout, MCP3426A3T-E/MC application, or MCP3426A3T-E/MC equivalent, key selection considerations include its factory-programmed I²C address, 8-pin SOIC/MSOP/DFN package compatibility, self-calibrating offset/gain per conversion, and low 9 µA typical standby current in 16-bit one-shot mode.
Technical Context
The MCP3426A3T-E/MC implements a delta-sigma modulator with integrated 3.2 pF sampling capacitor and on-chip oscillator, enabling auto-calibration of offset and gain before each conversion. Its switched-capacitor front end supports differential or single-ended inputs with PGA gain scaling prior to digitization.
Conversion results are output via I²C in two's complement format with configurable resolution (12/14/16 bits) and data rate (240/60/15 SPS). The device uses a fixed factory-set I²C address and lacks external address pins - unlike MCP3427/3428 - simplifying bus topology in dual-channel ADC applications.
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 |
| Differential Input Range | ±2.048 V / PGA - full-scale range scales inversely with PGA setting (e.g., ±256 mV at x8) |
| INL Error | 10 ppm of FSR - ensures ≤0.001% linearity error across full scale at 16-bit mode |
| On-board Reference | 2.048 V ±0.05% (15 ppm/°C drift) - eliminates need for external precision reference |
| Supply Current | 135 µA typical (3V, continuous); 9 µA typical (3V, 16-bit one-shot) - supports battery-powered instrumentation |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
| I²C Compatibility | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - interoperable with legacy and high-throughput controllers |
Pinout & Package
The MCP3426A3T-E/MC is available in 8-pin SOIC, MSOP, and 2×3 DFN packages with exposed thermal pad (EP), all sharing identical pin mapping and electrical functionality.
| 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+; internal 3.2 pF sampling capacitor connects here |
| CH2+ | Differential analog input, channel 2 positive | Independent second channel; same input structure and PGA scaling as CH1 |
| CH2− | Differential analog input, channel 2 negative | Enables true differential measurement on second sensor or bridge leg |
| VSS | Analog/digital ground return | Must connect to low-impedance analog ground plane; EP internally tied to VSS |
| VDD | Positive supply (2.7–5.5 V) | Requires 0.1 µF ceramic + 10 µF tantalum bypassing; powers PGA, reference, and ΔΣ core |
| SDA | I²C bidirectional data line | Open-drain output/input; requires external pull-up; transmits 16/14/12-bit two's complement codes |
| SCL | I²C serial clock input | Open-drain compatible; accepts up to 3.4 MHz clock; controls data timing and configuration writes |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset & gain | Eliminates system-level calibration routines; maintains accuracy across temperature and supply drift |
| Programmable gain amplifier (x1/x2/x4/x8) | Enables direct digitization of µV-level thermocouple or mV-level bridge outputs without external op-amps |
| On-board 2.048 V reference | Removes external reference IC and associated layout sensitivity; 15 ppm/°C drift supports wide-temp operation |
| One-shot conversion mode | Reduces average current to <1 µA during idle - critical for portable fuel gauges and wireless sensors |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), essential for noisy industrial 4–20 mA loop environments |
Applications
| Temperature Sensing with RTD/Thermistor | Bridge Sensing for Pressure & Strain |
|---|---|
Use Scenario: High-accuracy ambient or process temperature monitoring using Pt100 RTD in 4-wire configuration. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes excitation current sense and RTD voltage drop simultaneously with matched gain/offset tracking. Use Value: 16-bit resolution and 10 ppm INL enable <0.1°C repeatability over –40°C to +125°C without system calibration. | Use Scenario: Industrial pressure transducer with Wheatstone bridge output in harsh EMI environments. IC Role / Device Role / Timing Role: Measures differential bridge output while rejecting common-mode noise from motor drives or switching power supplies. Use Value: 110 dB CMRR at PGA=8 and built-in 2.048 V reference eliminate need for external instrumentation amp and reference. |
| Weigh Scales & Load Cells | Battery Fuel Gauging |
Use Scenario: Precision digital weighing system using micro-strain gauge load cells with low mV/V output. IC Role / Device Role / Timing Role: Digitizes low-level bridge signals with programmable gain; one-shot mode minimizes power between weigh cycles. Use Value: PGA x8 extends effective resolution to 19 bits on 2.5 mV/V bridge, enabling 10,000:1 dynamic range in portable scales. | Use Scenario: State-of-charge estimation in Li-ion battery packs using coulomb counting and voltage monitoring. IC Role / Device Role / Timing Role: Simultaneously measures cell voltage (CH1) and sense resistor voltage (CH2) with correlated sampling. Use Value: Self-calibration ensures long-term accuracy of current integration; 9 µA one-shot current extends battery life in maintenance-free gauges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, precision 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 | Higher speed but less integrated - needs external reference, PGA biasing, and anti-aliasing design | Select when higher throughput or 4-channel count outweighs reference integration and ultra-low standby current |
| MCP3424-E/SL | 4-channel, 16-bit, same family; includes Adr0/Adr1 pins for I²C address flexibility; higher thermal resistance in SOIC | Same accuracy and calibration features, but adds channel count and address configurability at cost of larger footprint | Select when expanding to 4 sensors or requiring multiple devices on same I²C bus without level-shifting |
Compared with ADS1115IDGSR and MCP3424-E/SL, the MCP3426A3T-E/MC offers lowest system BOM count due to integrated reference and factory-fixed I²C address, making it optimal for space-constrained dual-sensor designs where bus simplicity and guaranteed calibration stability are prioritized.
Availability
MCP3426A3T-E/MC is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and battery-powered measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3426A3T-E/MC 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 integration, self-calibration, and ease of use over raw speed.
FAQ
What is the factory-programmed I²C address of the MCP3426A3T-E/MC?
The MCP3426A3T-E/MC has a fixed I²C address programmed during manufacturing and does not support external address pin configuration like the MCP3427 or MCP3428. Its default 7-bit address is 1001000 (0x48) in standard mode, confirmed in Microchip's DS22226A datasheet Section 5.3.1. This simplifies bus arbitration in single-device systems but requires address multiplexing or level-shifting when multiple MCP3426A3T-E/MC units share an I²C bus.
Does the MCP3426A3T-E/MC require an external voltage reference?
No, the MCP3426A3T-E/MC integrates a precision 2.048 V ±0.05% voltage reference with 15 ppm/°C drift, eliminating the need for external reference components. This reference is used exclusively for ADC conversion and is not accessible at a pin. Its tight tolerance and low drift directly determine the absolute accuracy of MCP3426A3T-E/MC measurements without external calibration.
How does the self-calibration feature work in the MCP3426A3T-E/MC?
The MCP3426A3T-E/MC performs full offset and gain calibration automatically before every conversion cycle - not just at power-up. This real-time correction compensates for temperature-induced drift and supply voltage fluctuations, ensuring consistent 10 ppm INL performance across –40°C to +125°C. Calibration occurs internally using the on-board reference and does not require host intervention or additional timing overhead beyond the configured data rate.
Can the MCP3426A3T-E/MC measure single-ended signals?
Yes, the MCP3426A3T-E/MC supports single-ended measurement by connecting the negative input (e.g., CH1−) to VSS while applying the signal to the corresponding positive input (e.g., CH1+). This configuration reduces effective resolution by 1 bit compared to true differential mode due to common-mode rejection loss, but retains full 16-bit capability when referenced to system ground. Input impedance remains 2.25 MΩ at PGA=1 in this mode.
What package options are available for the MCP3426A3T-E/MC?
The MCP3426A3T-E/MC is offered in three RoHS-compliant packages: 8-pin SOIC (3.9 mm × 4.9 mm), 8-pin MSOP (3.0 mm × 3.0 mm), and 8-pin 2×3 mm DFN with exposed thermal pad (EP). All variants share identical pinout, electrical specs, and thermal pad connection requirement (EP must be soldered to VSS). The DFN version provides lowest θJA (84.5°C/W) for thermally demanding applications.
MCP3426A3T-E/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3426A3T-E/MC FAQ
1.How can I place an order for MCP3426A3T-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A3T-E/MC 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 MCP3426A3T-E/MC reliable?
The price and inventory of MCP3426A3T-E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3426A3T-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3426A3T-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A3T-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A3T-E/MC?
MCP3426A3T-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A3T-E/MC 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 MCP3426A3T-E/MC?
For technical support, including MCP3426A3T-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A3T-E/MC requirements.
6.How does Aetrix verify that MCP3426A3T-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3426A3T-E/MC 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 MCP3426A3T-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3426A3T-E/MC?
All MCP3426A3T-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A3T-E/MC, 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 MCP3426A3T-E/MC part is unused and in its original packaging.
Return procedure for MCP3426A3T-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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