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Microchip Technology MCP3426A0T-E/MC
- Part No.:
- MCP3426A0T-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3426A0T-E/MC.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
MCP3426A0T-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 supply across –40°C to +125°C for precision sensor signal acquisition in industrial instrumentation.
For engineers reviewing the MCP3426A0T-E/MC datasheet, MCP3426A0T-E/MC pinout, MCP3426A0T-E/MC application, or MCP3426A0T-E/MC equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with functional differences, and supply support for high-reliability embedded measurement systems.
Technical Context
The MCP3426A0T-E/MC implements a delta-sigma modulator with integrated PGA, self-calibrating offset and gain per conversion, and an internal 2.048V reference enabling ±2.048V differential full-scale range. Its switched-capacitor input stage uses a 3.2 pF sampling capacitor and supports both one-shot (9 µA typical at 16-bit/1SPS) and continuous (135 µA typical at 3V) operation.
I²C communication includes configurable address pins (factory-programmed for MCP3426), support for 100 kHz / 400 kHz / 3.4 MHz modes, and open-drain SDA/SCL requiring external pull-ups. The device performs automatic calibration during each conversion cycle to maintain accuracy over temperature and supply variation without external 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; determines effective noise floor and dynamic range trade-off. |
| Differential Input Range | ±2.048V / PGA - enables precise measurement of low-level signals (e.g., thermocouple mV outputs) when PGA = 8. |
| INL Error | 10 ppm of full-scale range - ensures linearity error ≤ ±66 µV at 16-bit mode, critical for calibrated sensor systems. |
| On-board Reference | 2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external reference and reduces BOM count and layout sensitivity. |
| Supply Current | 9 µA typical (one-shot, 16-bit, 1 SPS) - enables battery-powered portable instrumentation with multi-year runtime. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, factory automation, and harsh industrial environments. |
| I²C Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration without protocol translation. |
Pinout & Package
The MCP3426A0T-E/MC is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), optimized for thermal dissipation and board-level reliability in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Differential analog input, channel 1 positive | Accepts high-impedance sensor signals; must be paired with CH1– for true differential measurement or referenced to VSS for single-ended use. |
| CH1– | Differential analog input, channel 1 negative | Completes differential pair with CH1+; common-mode rejection >105 dB enables noise immunity in noisy industrial settings. |
| CH2+ | Differential analog input, channel 2 positive | Enables dual-channel synchronous sampling (e.g., current + voltage in power monitoring) without external multiplexer. |
| CH2– | Differential analog input, channel 2 negative | Provides second independent differential path; supports ratiometric measurements using same internal reference. |
| VSS | Analog/digital ground return | Must connect to low-impedance analog ground plane; EP pad is internally tied to VSS and requires PCB solder connection for thermal and electrical integrity. |
| VDD | Positive supply (2.7–5.5V) | Requires local 0.1 µF ceramic + optional 10 µF tantalum bypassing; power-on-reset triggers at ~2.2V with 200 mV hysteresis. |
| SDA | I²C bidirectional data line | Open-drain output/input; requires external pull-up (5–10 kΩ for standard/fast mode); transmits 16-/14-/12-bit two's complement codes MSB-first. |
| SCL | I²C serial clock input | Open-drain input; accepts master-generated clock edges; data stable during high clock phase per I²C specification. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset & gain | Eliminates need for system-level calibration routines; maintains <±30 µV offset and <0.1% gain error across temperature and supply variation. |
| Programmable gain amplifier (x1/x2/x4/x8) | Extends usable input range from ±256 mV (PGA=8) to ±2.048 V (PGA=1), enabling direct interface with RTDs, load cells, and thermistors. |
| On-board oscillator | Removes external timing components; ensures consistent conversion timing and simplifies layout by eliminating crystal or RC network. |
| Dual differential input channels | Supports simultaneous measurement of two isolated sensor signals (e.g., temperature + pressure) without external mux or additional ADCs. |
| Low-power standby mode | Consumes ≤0.3 µA (typical) during idle periods - essential for energy harvesting and battery-backed data loggers. |
Applications
| Temperature Sensing | Bridge-Based Transducers |
|---|---|
|
Use Scenario: Measuring resistance change in Pt100 RTDs or NTC thermistors in HVAC controllers and industrial ovens. IC Role / Device Role: High-accuracy, low-noise digitization of microvolt-level bridge imbalances with built-in reference stability. Use Value: Achieves ±0.1°C temperature resolution over –40°C to +125°C without external amplification or calibration. |
Use Scenario: Reading strain gauge or pressure sensor bridges in structural health monitoring and process control valves. IC Role / Device Role: Differential front-end with programmable gain to resolve sub-millivolt outputs while rejecting common-mode noise. Use Value: Delivers 16-bit ENOB at 15 SPS with 105 dB CMRR, enabling <0.05% full-scale measurement accuracy. |
| Weigh Scales | Battery Fuel Gauging |
|
Use Scenario: Precision load cell readout in retail scales and industrial platform scales requiring legal-for-trade certification. IC Role / Device Role: Dual-channel synchronized sampling for excitation voltage monitoring and bridge output correction. Use Value: Self-calibration compensates for thermal drift in load cell elements, maintaining repeatability within ±2 LSB over temperature. |
Use Scenario: Monitoring cell voltage and current sense in lithium-ion battery packs for UPS and portable medical devices. IC Role / Device Role: Low-quiescent-current ADC with one-shot mode to minimize power draw during periodic state-of-charge sampling. Use Value: 9 µA typical standby current extends battery life in always-on fuel gauges without sacrificing 16-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-accuracy, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel, 16-bit, 860 SPS max; no on-board reference; requires external 2.048V ref or uses VDD as reference. | Lacks integrated reference and self-calibration; higher throughput but lower baseline accuracy without careful external component selection. | Select ADS1115IDGSR only when higher sample rate (>240 SPS) is required and external reference design is acceptable. |
| MCP3421A0T-E/MS | Single-channel, 18-bit, 15 SPS; identical package, reference, and I²C interface; no CH2 inputs or address pins. | Reduces channel count and removes dual-input capability; offers higher resolution but no multi-channel flexibility. | Choose MCP3421A0T-E/MS when single-sensor precision dominates over multi-channel needs and 18-bit resolution is mandatory. |
Compared with ADS1115IDGSR and MCP3421A0T-E/MS, the MCP3426A0T-E/MC uniquely balances dual-channel capability, integrated reference, self-calibration, and ultra-low standby current - making it optimal for compact, self-contained sensor nodes where BOM count, calibration overhead, and power budget are constrained.
Availability
MCP3426A0T-E/MC is available at Aetrix Electronics and suitable for industrial instrumentation, battery-powered sensors, and automotive cabin temperature monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3426A0T-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, 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 power-constrained embedded systems - emphasizing integrated functionality, minimal external components, and robust operation across wide temperature ranges.
FAQ
What is the factory-set I²C address for MCP3426A0T-E/MC?
The MCP3426A0T-E/MC has its I²C address programmed at the factory during production and cannot be modified via external pins. Its default 7-bit address is 0x68 (1101000b) when A0 = low, or 0x69 (1101001b) when A0 = high - matching the MCP3426 family's fixed addressing scheme. This differs from the MCP3427/MCP3428, which use Adr0/Adr1 pins for address configuration.
Does MCP3426A0T-E/MC require external calibration for production use?
No, the MCP3426A0T-E/MC performs automatic offset and gain calibration before every conversion, eliminating the need for external calibration in production. This self-calibration ensures <±30 µV offset error and <0.1% gain error over –40°C to +125°C and 2.7–5.5V supply, making it suitable for unattended field-deployed instrumentation without recalibration cycles.
Can MCP3426A0T-E/MC measure single-ended signals?
Yes, the MCP3426A0T-E/MC supports single-ended operation by connecting CH1– or CH2– to VSS, while applying the signal to CH1+ or CH2+. However, doing so sacrifices common-mode rejection and noise immunity - the device's differential architecture is optimized for true differential inputs, and single-ended use reduces effective resolution and increases susceptibility to ground bounce and EMI.
What is the maximum input voltage allowed on CH1+ or CH2+ pins of MCP3426A0T-E/MC?
The absolute maximum input voltage on CH1+ or CH2+ is VSS – 0.3V to VDD + 0.3V per the datasheet. Exceeding this range risks forward-biasing internal ESD diodes, causing leakage current (>±2 mA), conversion errors, or permanent damage. For safe operation, keep differential input |CHn+ – CHn–| ≤ ±2.048V/PGA and ensure common-mode voltage stays within the supply rails.
How does the exposed thermal pad (EP) on MCP3426A0T-E/MC affect thermal performance?
The exposed thermal pad (EP) on the MCP3426A0T-E/MC is internally connected to VSS and must be soldered to a PCB copper pour tied to VSS. In the 8-pin SOIC package, this reduces θJA from 149.5°C/W (no EP connection) to ~120°C/W (with proper EP thermal vias and copper area), improving long-term reliability in high-ambient-temperature applications like motor control enclosures or automotive ECUs.
MCP3426A0T-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:
- -
MCP3426A0T-E/MC FAQ
1.How can I place an order for MCP3426A0T-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A0T-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 MCP3426A0T-E/MC reliable?
The price and inventory of MCP3426A0T-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 MCP3426A0T-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3426A0T-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A0T-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A0T-E/MC?
MCP3426A0T-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A0T-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 MCP3426A0T-E/MC?
For technical support, including MCP3426A0T-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A0T-E/MC requirements.
6.How does Aetrix verify that MCP3426A0T-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3426A0T-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 MCP3426A0T-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3426A0T-E/MC?
All MCP3426A0T-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A0T-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 MCP3426A0T-E/MC part is unused and in its original packaging.
Return procedure for MCP3426A0T-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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