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Microchip Technology MCP3426A5-E/SN
- Part No.:
- MCP3426A5-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MCP3426A5-E/SN.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:172
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Product details
Overview
MCP3426A5-E/SN from Microchip Technology is a 16-bit delta-sigma 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 MCP3426A5-E/SN datasheet, MCP3426A5-E/SN pinout, MCP3426A5-E/SN application, or MCP3426A5-E/SN equivalent, key selection considerations include its factory-programmed I²C address, SOIC-8 package mapping, self-calibrating offset/gain per conversion, differential input impedance of 2.25 MΩ at PGA=1, and low 9 µA typical standby current in 16-bit one-shot mode.
Technical Context
The MCP3426A5-E/SN implements a switched-capacitor delta-sigma modulator with integrated 2.048V reference and programmable gain amplifier front-end, enabling high-accuracy measurement of low-level signals such as RTD or bridge outputs. Its internal oscillator eliminates external timing components, and automatic per-conversion calibration compensates for temperature-induced drift and supply variation.
It supports both continuous and one-shot conversion modes via I²C configuration register writes, with resolution/data rate trade-offs fixed at 16-bit/15 SPS, 14-bit/60 SPS, or 12-bit/240 SPS. The device uses binary two's complement output coding and features 105 dB common-mode rejection at DC with PGA=1.
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 speed for dynamic signal capture |
| Differential Input Range | ±2.048V / PGA - full-scale range scales inversely with PGA setting, enabling sub-millivolt signal digitization at x8 gain |
| INL Error | 10 ppm of FSR - ensures monotonicity and linearity critical for closed-loop control and calibration-critical 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 | 135 µA typical (3V, continuous), 9 µA typical (16-bit one-shot) - enables battery-powered portable instrumentation with multi-year operation |
| I²C Interface | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration without clock stretching limitations |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, factory automation, and harsh industrial environments |
Pinout & Package
The MCP3426A5-E/SN is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) with exposed thermal pad (EP) internally connected to VSS and requiring PCB connection to ground plane for thermal and noise performance.
| 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 measurement or with VSS for single-ended mode |
| CH1– | Differential analog input, channel 1 negative | Common-mode range extends to VSS–0.3V; forms 3.2 pF switched-capacitor sampling node with CH1+ |
| CH2+ | Differential analog input, channel 2 positive | Independent second channel with identical electrical characteristics to CH1+, supports time-multiplexed dual-sensor readout |
| CH2– | Differential analog input, channel 2 negative | Paired with CH2+; shares same PGA, reference, and ADC core - no crosstalk in differential mode |
| VSS | Analog/digital ground reference | Must connect to low-impedance analog ground plane; EP pad ties internally to VSS for thermal dissipation and noise reduction |
| VDD | Positive supply (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum decoupling; POR threshold is 2.2V ±5% with 200 mV hysteresis |
| SDA | I²C bidirectional data line | Open-drain N-channel output; requires external pull-up (5–10 kΩ for standard/fast mode); transmits LSB-aligned two's complement codes |
| SCL | I²C serial clock input | Open-drain input; accepts external master clock edges; data latched on rising edge, output valid on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration per conversion | Automatically corrects offset and gain errors in real time, eliminating need for system-level recalibration during temperature cycling or supply drift |
| Programmable gain amplifier | Hardware-selectable x1/x2/x4/x8 gain enables direct digitization of microvolt-level bridge or thermocouple outputs without external op-amps |
| On-board oscillator | Removes requirement for external crystal or clock source, reducing component count, board space, and EMI susceptibility |
| Differential input architecture | Rejects common-mode noise up to 105 dB at DC (PGA=1), critical for noisy industrial environments with long sensor leads |
| One-shot low-power mode | Draws only 9 µA typical in 16-bit mode between conversions, enabling ultra-low-duty-cycle sensing in energy-constrained IoT nodes |
Applications
| Temperature Sensing | Bridge-Based Transducers |
|---|---|
Use Scenario: Measuring resistance change in Pt100 RTDs or NTC thermistors using constant-current excitation and ratiometric conversion. IC Role / Device Role / Timing Role: Precision 16-bit ADC digitizing differential voltage across sensor, leveraging on-board 2.048V reference and PGA for optimal SNR. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C without external reference or calibration tables due to self-calibration and low INL. | Use Scenario: Reading output of Wheatstone bridge pressure sensors or strain gauges in factory automation equipment. IC Role / Device Role / Timing Role: High-common-mode-rejection ADC capturing mV-level differential bridge output while rejecting motor-drive noise and ground bounce. Use Value: Delivers stable 16-bit readings at 15 SPS with 105 dB CMRR, eliminating need for external instrumentation amplifiers or filtering stages. |
| Weigh Scales | Battery Fuel Gauging |
Use Scenario: Converting millivolt-level output from load cell bridges in industrial bench scales and platform scales. IC Role / Device Role / Timing Role: Low-drift, self-calibrating ADC interfacing directly to bridge, using PGA to resolve sub-10µV changes in full-scale output. Use Value: Enables 1:100,000 resolution (0.001% FSR) with <10 ppm INL, meeting OIML R76 Class III accuracy requirements without system calibration. | 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 synchronized conversion timing and shared reference. Use Value: Provides matched gain/offset tracking between channels, reducing coulomb counting error to <1% over full temperature range. |
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 on-board reference; requires external 2.048V ref or uses VDD as reference | Higher channel count but lacks integrated reference and self-calibration; needs external components for same accuracy | Select when multi-channel expansion or comparator functionality is required and board space allows external reference |
| MCP3421A5-E/SN | Single-channel variant with identical pinout, reference, PGA, and I²C interface; shares same SOIC-8 package and factory-set address | Reduces channel count by 50%; suitable where only one sensor interface is needed per node | Choose for cost-sensitive single-sensor designs where footprint compatibility and firmware reuse are priorities |
Compared with ADS1115IDGSR, MCP3426A5-E/SN delivers lower system-level BOM count and higher accuracy out-of-box due to integrated reference and per-conversion calibration; compared with MCP3421A5-E/SN, it doubles channel density without increasing PCB area or firmware complexity.
Availability
MCP3426A5-E/SN is available at Aetrix Electronics and suitable for industrial instrumentation, factory automation equipment, and battery-powered portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP3426A5-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 devices, 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-constrained embedded systems - emphasizing integrated references, self-calibration, and I²C simplicity over raw speed or channel count.
FAQ
What is the factory-programmed I²C address of the MCP3426A5-E/SN?
The MCP3426A5-E/SN has its I²C address permanently programmed at the factory and cannot be changed via external pins. Its default 7-bit address is 0x68 (1101000b), corresponding to the "A5" suffix per Microchip's addressing scheme. This fixed address simplifies system design by eliminating address conflict concerns in multi-device I²C buses, and is confirmed in DS22226A-page 2 and Table 5-1 of the official datasheet for MCP3426A5-E/SN.
Does the MCP3426A5-E/SN require external calibration during system operation?
No, the MCP3426A5-E/SN performs automatic offset and gain calibration before every conversion, eliminating the need for external or periodic system calibration. This self-calibration compensates for temperature drift and supply variation in real time, ensuring consistent 10 ppm INL performance across –40°C to +125°C without user intervention. The process is transparent and occurs within the conversion cycle time specified for each data rate mode.
Can the MCP3426A5-E/SN operate with a 3.3V supply and still achieve full 16-bit performance?
Yes, the MCP3426A5-E/SN operates fully across 2.7V to 5.5V and maintains all specifications - including 16-bit resolution, 10 ppm INL, and 15 SPS data rate - at 3.3V. Supply current drops to 135 µA typical in continuous mode and 9 µA in 16-bit one-shot mode at 3V, and the on-board 2.048V reference remains accurate within ±0.05% regardless of VDD, as verified in Electrical Characteristics tables on DS22226A-page 5.
How does the exposed thermal pad (EP) on the MCP3426A5-E/SN SOIC package function electrically?
The exposed thermal pad (EP) on the MCP3426A5-E/SN is internally connected to VSS and must be soldered to a PCB ground plane for both thermal management and noise reduction. It is not a separate power or signal terminal; connecting EP to VSS improves thermal resistance (θJA = 149.5°C/W for SOIC) and lowers analog ground impedance, directly enhancing ADC accuracy by reducing ground bounce and EMI coupling into the sensitive analog input stage.
Is the MCP3426A5-E/SN compatible with high-speed I²C mode (3.4 MHz)?
Yes, the MCP3426A5-E/SN supports high-speed I²C mode at 3.4 MHz, in addition to standard (100 kHz) and fast (400 kHz) modes. To enable high-speed mode, the host controller must issue the appropriate bus initialization sequence, and pull-up resistors must be ≤1 kΩ on both SDA and SCL lines. All timing parameters - including setup/hold times and clock stretching behavior - are fully characterized for this mode in Section 5.3.1 of DS22226A.
MCP3426A5-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
MCP3426A5-E/SN FAQ
1.How can I place an order for MCP3426A5-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A5-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 MCP3426A5-E/SN reliable?
The price and inventory of MCP3426A5-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 MCP3426A5-E/SN is usually 5 days.
3.What payment methods are accepted for MCP3426A5-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A5-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A5-E/SN?
MCP3426A5-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A5-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 MCP3426A5-E/SN?
For technical support, including MCP3426A5-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A5-E/SN requirements.
6.How does Aetrix verify that MCP3426A5-E/SN is sourced from the original manufacturer or authorized distributors?
All MCP3426A5-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 MCP3426A5-E/SN meets industry standards.
7.What is the process for return or replacement of MCP3426A5-E/SN?
All MCP3426A5-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A5-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 MCP3426A5-E/SN part is unused and in its original packaging.
Return procedure for MCP3426A5-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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