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Microchip Technology MCP3426A2T-E/MS
- Part No.:
- MCP3426A2T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP3426A2T-E/MS.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
MCP3426A2T-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, ±2.048V full-scale differential input range, and operates from 2.7V to 5.5V supply across –40°C to +125°C.
For engineers reviewing the MCP3426A2T-E/MS datasheet, MCP3426A2T-E/MS pinout, MCP3426A2T-E/MS application, or MCP3426A2T-E/MS equivalent, key selection criteria include differential channel count, self-calibrating offset/gain per conversion, low-power one-shot mode (0.56 µA in 12-bit mode), PGA-configurable input sensitivity, and MSOP-8 package compatibility with space-constrained industrial sensing layouts.
Technical Context
The MCP3426A2T-E/MS implements a delta-sigma modulation architecture with integrated 3.2 pF sampling capacitor, on-chip oscillator, and automatic per-conversion offset/gain calibration. Its switched-capacitor front end supports differential or single-ended inputs with input impedance of 2.25 MΩ/PGA during active conversion.
It uses a binary two's complement output format with MSB-first I²C transmission, supports 12-/14-/16-bit resolution via configuration register, and features internal 2.048V reference with 15 ppm/°C drift - enabling stable measurement accuracy without external reference components.
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 for trade-off between precision and throughput |
| Differential Input Range | ±2.048V / PGA - enables ±256 mV full-scale with x8 gain for microvolt-level signal digitization |
| INL Error | 10 ppm of FSR - ensures ≤±0.66 LSB linearity error over full scale at 16-bit mode |
| Supply Current (16-bit One-Shot) | 9 µA typical - allows battery-powered operation with extended idle periods between conversions |
| Reference Accuracy | 2.048 V ±0.05% - eliminates need for external precision reference in most industrial sensor interfaces |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, factory automation, and harsh-environment monitoring |
| I²C Speed Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration |
Pinout & Package
The MCP3426A2T-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. The EP must be soldered to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Differential analog input, channel 1 positive | Accepts high-impedance sensor signals (e.g., RTD bridge top); paired with CH1− for true differential measurement |
| CH1− | Differential analog input, channel 1 negative | Completes differential pair; may be tied to VSS for single-ended operation with reduced noise immunity |
| CH2+ | Differential analog input, channel 2 positive | Enables dual-sensor monitoring (e.g., temperature + pressure) without multiplexer switching latency |
| CH2− | Differential analog input, channel 2 negative | Provides second independent differential path; shares same PGA and reference as CH1 |
| VSS | Analog/digital ground reference | Must connect to low-impedance analog ground plane; EP is internally bonded to this pin |
| VDD | Positive supply (2.7–5.5 V) | Requires local 0.1 µF ceramic + 10 µF tantalum decoupling to suppress switching noise affecting ADC accuracy |
| SDA | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ) to VDD for standard/fast mode operation |
| SCL | I²C serial clock input | Open-drain input; clock edges control data timing; master-driven only; pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset and gain | Per-conversion correction eliminates drift-induced errors across temperature and supply variations |
| Programmable gain amplifier (x1/x2/x4/x8) | Configurable input sensitivity enables direct digitization of µV-level thermocouple or strain gauge outputs |
| On-board 2.048V reference (15 ppm/°C) | Removes external reference component cost and layout area while maintaining <±0.1% total gain error |
| One-shot conversion mode | Reduces average current to sub-µA levels during sensor read intervals - critical for coin-cell lifetime |
| Differential input structure (2 channels) | Rejects common-mode noise up to 110 dB (PGA=8), essential for noisy industrial 4–20 mA loop environments |
Applications
| Temperature Monitoring | Bridge-Based Sensing |
|---|---|
Use Scenario: Real-time ambient and junction temperature tracking in motor drives and power converters using PT100 RTDs. IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizes ratiometric RTD voltage drops with auto-calibrated gain/offset to reject lead-wire resistance errors. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C without external calibration, leveraging on-board 2.048V reference and x8 PGA for microvolt sensitivity. |
Use Scenario: High-resolution pressure measurement in HVAC transmitters using silicon piezoresistive bridges. IC Role / Device Role / Timing Role: Digitizes mV-level bridge output differentially across CH1+/CH1− and CH2+/CH2− to support dual-sensor redundancy or temperature compensation. Use Value: 16-bit resolution at 15 SPS resolves <10 µV changes, enabling 0.05% FS pressure accuracy with built-in INL correction and CMRR >105 dB. |
| Weigh Scale Front-End | Battery Fuel Gauging |
Use Scenario: Precision load cell readout in commercial scales and industrial weighing systems. IC Role / Device Role / Timing Role: Converts Wheatstone bridge output with programmable gain to maximize dynamic range while rejecting EMI from nearby AC motors. Use Value: Differential architecture and 10 ppm INL ensure repeatability within ±0.005% of full scale, meeting OIML R76 Class III requirements. |
Use Scenario: State-of-charge estimation in lithium-ion battery packs using coulomb counting and voltage monitoring. IC Role / Device Role / Timing Role: Simultaneously measures cell voltage (CH1) and sense resistor voltage drop (CH2) with synchronized 16-bit sampling and auto-zero calibration. Use Value: One-shot mode draws only 9 µA per conversion, extending battery life in portable fuel gauges while maintaining <1 mV voltage measurement accuracy. |
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, no internal reference; requires external 2.048V ref or uses VDD as reference | Lacks on-board reference and self-calibration; higher system BOM cost and calibration effort | Select when multi-channel count >2 is required and external reference already exists in design |
| MCP3421A0T-E/OT | Single-channel, identical architecture and specs; same MSOP-8 footprint but no CH2 pins | Not suitable for dual-sensor applications; saves board area where only one differential input is needed | Choose for cost-sensitive single-input designs where CH2 functionality is unused |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A2T-E/MS uniquely integrates reference, PGA, and self-calibration in a dual-channel MSOP-8 package - reducing component count, calibration overhead, and PCB area for compact industrial sensor nodes.
Availability
MCP3426A2T-E/MS is available at Aetrix Electronics and suitable for factory automation equipment, portable instrumentation, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP3426A2T-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 devices, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in space- and energy-constrained applications - emphasizing integrated references, self-calibration, and robust I²C interfacing.
FAQ
What is the maximum differential input voltage range supported by the MCP3426A2T-E/MS?
The MCP3426A2T-E/MS supports a differential input full-scale range of ±2.048V / PGA. With PGA = 1, this equals ±2.048V; with PGA = 8, it reduces to ±256 mV. Exceeding this range causes saturation (all 0s or all 1s except sign bit). Absolute pin voltage must remain within VSS–0.3V to VDD+0.3V to avoid ESD diode conduction.
Does the MCP3426A2T-E/MS require an external voltage reference?
No, the MCP3426A2T-E/MS includes an on-board 2.048V ±0.05% voltage reference with 15 ppm/°C drift. This reference is used internally for ADC conversion and is not accessible externally. No external reference is needed for standard operation, simplifying BOM and layout.
How does the self-calibration feature of the MCP3426A2T-E/MS work?
The MCP3426A2T-E/MS performs full offset and gain calibration automatically before each conversion. This corrects for temperature-induced drift and supply-voltage variations in real time, ensuring consistent accuracy without manual recalibration or external compensation circuits.
What I²C address options are available for the MCP3426A2T-E/MS?
The MCP3426A2T-E/MS has its I²C address programmed at the factory and is fixed - unlike the MCP3427/MCP3428, it does not use Adr0/Adr1 pins. Its default 7-bit address is 1001000 (0x48) in standard mode, confirmed in Microchip DS22226A Section 5.3.1.
Can the MCP3426A2T-E/MS operate in single-ended mode?
Yes, the MCP3426A2T-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 due to increased susceptibility to ground bounce and EMI.
MCP3426A2T-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:
- -
MCP3426A2T-E/MS FAQ
1.How can I place an order for MCP3426A2T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A2T-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 MCP3426A2T-E/MS reliable?
The price and inventory of MCP3426A2T-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 MCP3426A2T-E/MS is usually 5 days.
3.What payment methods are accepted for MCP3426A2T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A2T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A2T-E/MS?
MCP3426A2T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A2T-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 MCP3426A2T-E/MS?
For technical support, including MCP3426A2T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A2T-E/MS requirements.
6.How does Aetrix verify that MCP3426A2T-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP3426A2T-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 MCP3426A2T-E/MS meets industry standards.
7.What is the process for return or replacement of MCP3426A2T-E/MS?
All MCP3426A2T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A2T-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 MCP3426A2T-E/MS part is unused and in its original packaging.
Return procedure for MCP3426A2T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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