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Microchip Technology MCP3426A1-E/MC
- Part No.:
- MCP3426A1-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3426A1-E/MC.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
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Product details
Overview
MCP3426A1-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 MCP3426A1-E/MC datasheet, MCP3426A1-E/MC pinout, MCP3426A1-E/MC application, or MCP3426A1-E/MC equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for high-accuracy, low-power ADC selection in battery-powered and thermally demanding systems.
Technical Context
The MCP3426A1-E/MC implements a delta-sigma modulator with integrated PGA, on-chip oscillator, and self-calibrating offset/gain correction per conversion - eliminating external calibration components. Its switched-capacitor input stage uses a 3.2 pF sampling capacitor and supports both differential and single-ended configurations on CH1+/CH1– and CH2+/CH2–.
It features a fixed I²C address programmed at factory (no Adr0/Adr1 pins), operates in one-shot or continuous mode, and enters sub-1 µA standby after one-shot conversion. The 2.048V reference enables ±2.048V differential full-scale range, scalable by PGA gain to ±256 mV (x8) or ±2.048 V (x1), with input impedance of 2.25 MΩ at 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 - selectable per conversion; higher bit depth trades speed for noise floor reduction in low-frequency sensing. |
| Differential Input Range | ±2.048V / PGA - full-scale range shrinks to ±256 mV at x8 gain, enabling direct digitization of microvolt-level bridge outputs without external amplification. |
| INL Error | 10 ppm of FSR - translates to ±0.66 LSB max nonlinearity at 16-bit, critical for <0.01% accuracy in weigh scales and RTD measurements. |
| Supply Current | 135 µA typical (3V, continuous); 9 µA typical (16-bit one-shot) - enables multi-year battery life in portable fuel gauges and handheld test equipment. |
| Reference Accuracy | 2.048V ±0.05% (±1.02 mV) - eliminates need for external reference trimming in factory automation sensors where absolute voltage accuracy matters. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive pressure sensing and industrial motor control feedback loops. |
| I²C Compatibility | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports high-throughput data streaming in PLC analog input modules. |
Pinout & Package
Package: 8-pin SOIC (MCP3426A1-E/MC is the SOIC variant with factory-programmed I²C address; no Adr0/Adr1 pins).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CH1+ | Differential positive input, Channel 1 | Accepts signal up to VDD+0.3V; used with CH1– for true differential measurement or with VSS for single-ended mode. |
| 2: CH1– | Differential negative input, Channel 1 | Common-mode voltage must stay within VSS–0.3V to VDD+0.3V; leakage occurs if exceeded due to ESD diode conduction. |
| 3: CH2+ | Differential positive input, Channel 2 | Independent second channel; shares same PGA, reference, and conversion engine as CH1 - time-multiplexed operation. |
| 4: CH2– | Differential negative input, Channel 2 | Enables dual-sensor monitoring (e.g., temperature + pressure) without external multiplexer or additional ADC. |
| 5: VSS | Analog/digital ground return | Must connect to low-impedance analog ground plane; internal EP pad ties to VSS - thermal pad soldering improves power dissipation. |
| 6: VDD | Positive supply (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum bypass; POR threshold at 2.2V ±5% ensures reliable startup in noisy industrial rails. |
| 7: SDA | I²C bidirectional data line | Open-drain output; needs pull-up (5–10 kΩ for 400 kHz); transmits 16/14/12-bit codes + status bits in MSB-first two's complement format. |
| 8: SCL | I²C serial clock input | Open-drain compatible; accepts external clock up to 3.4 MHz; timing defines conversion trigger and data read/write windows. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration per conversion | Automatically corrects offset and gain drift over temperature and supply variation - removes need for system-level recalibration in field-deployed equipment. |
| On-board 2.048V reference | 15 ppm/°C drift and ±0.05% initial accuracy - enables stable 16-bit measurements without external reference IC or trimming resistors. |
| Programmable gain amplifier | Gains of x1, x2, x4, x8 - allows single-device support of multiple sensor types (e.g., 100 Ω RTD at x8, 350 Ω strain gauge at x1) without redesign. |
| One-shot low-power mode | 9 µA typical (16-bit) standby current - extends battery life in wireless sensor nodes where measurements occur infrequently. |
| Differential input architecture | 105 dB CMRR at DC (PGA=1), 110 dB at PGA=8 - rejects common-mode noise from long sensor cables in factory floor environments. |
Applications
| Temperature Sensing | Bridge-Based Pressure Sensing |
|---|---|
|
Use Scenario: Measuring resistance change in Pt100 RTD or NTC thermistor using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Precision 16-bit ΔΣ ADC digitizing differential voltage across sensor; self-calibration maintains accuracy across –40°C to +125°C ambient. Use Value: Achieves ±0.1°C repeatability in HVAC controllers without external reference or calibration firmware - enabled by 10 ppm INL and on-board 2.048V reference. |
Use Scenario: Reading mV/V output from 350 Ω Wheatstone bridge pressure transducer in hydraulic system monitoring. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring bridge output (CH1) and reference voltage (CH2) simultaneously for ratiometric correction. Use Value: Delivers <0.02% FS error over temperature via PGA gain matching (0.1% max mismatch) and 105 dB CMRR - eliminating bridge offset drift compensation. |
| Weigh Scale Load Cell Interface | Battery Fuel Gauge Monitoring |
|
Use Scenario: Digitizing µV-level output from 1 mV/V load cell in retail scale with 10,000-count resolution. IC Role / Device Role / Timing Role: High-gain (x8) 16-bit ADC with 2.25 MΩ differential input impedance minimizing loading error on high-Z sensor outputs. Use Value: Resolves 100 nV LSB steps at x8 gain - enables 1 g resolution at 10 kg full scale without external instrumentation amplifier or filtering. |
Use Scenario: Monitoring cell voltage and current sense resistor voltage in Li-ion battery pack for state-of-charge estimation. IC Role / Device Role / Timing Role: Low-quiescent-current ADC performing periodic one-shot conversions on voltage and shunt signals during sleep cycles. Use Value: 9 µA one-shot current extends coin-cell life to >5 years in asset trackers - while 15 ppm/°C reference drift ensures voltage accuracy stays within ±5 mV over temperature. |
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, 16-bit, 860 SPS max; no on-board reference; requires external 2.048V ref or uses VDD as reference. | Higher speed but lower INL (15 ppm vs. 10 ppm); lacks self-calibration - needs system-level calibration for <0.01% accuracy. | Choose ADS1115IDGSR when higher throughput (860 SPS) is required and external reference is acceptable; avoid where factory calibration is prohibited. |
| MCP3421A0T-E/OT | Single-channel, 18-bit, 15 SPS; same 2.048V ref, PGA, and I²C interface; SOIC-8 package with factory-set address. | Higher resolution but no second channel; identical power profile and temperature range - suitable for single-sensor upgrades. | Choose MCP3421A0T-E/OT when only one channel is needed and 18-bit resolution justifies trade-off in channel count and cost. |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A1-E/MC uniquely balances dual-channel capability, on-board reference, self-calibration, and ultra-low one-shot current - making it optimal for space-constrained, maintenance-free industrial sensors requiring guaranteed 16-bit linearity without external components.
Availability
MCP3426A1-E/MC is available at Aetrix Electronics and suitable for industrial instrumentation, battery-powered sensor nodes, and automotive cabin temperature monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3426A1-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and interface ICs, with a focus on reliability, longevity, and industrial-grade qualification.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in harsh environments - emphasizing integrated references, self-calibration, and extended temperature operation without external support components.
FAQ
What is the I²C address configuration for MCP3426A1-E/MC?
The MCP3426A1-E/MC has its I²C address permanently programmed at the factory - unlike MCP3427/MCP3428, it does not include Adr0 or Adr1 pins. Its default 7-bit address is 0x68 (1101000b) in standard mode, and it supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) I²C protocols. No external address selection resistors are required or supported on this variant.
Does MCP3426A1-E/MC support single-ended input mode?
Yes, the MCP3426A1-E/MC supports single-ended operation: CH1– and CH2– can each be tied to VSS, allowing CH1+ and CH2+ to serve as independent single-ended inputs. However, doing so sacrifices common-mode rejection and reduces effective resolution by ~1 bit compared to true differential mode. The device retains full PGA and reference functionality in single-ended mode.
How does the self-calibration feature work in MCP3426A1-E/MC?
The MCP3426A1-E/MC performs automatic offset and gain calibration before every conversion cycle - using internal logic and the on-board 2.048V reference. This corrects for drift caused by temperature changes and supply fluctuations without user intervention or external calibration components. Calibration time is included in the total conversion period (e.g., 15 SPS includes calibration overhead).
What is the maximum input voltage range allowed on CH1+ and CH1– pins of MCP3426A1-E/MC?
The absolute maximum voltage on CH1+ and CH1– is VSS – 0.3V to VDD + 0.3V. Exceeding this range forward-biases internal ESD diodes, causing leakage current (>±2 mA) that degrades accuracy or damages the input structure. For safe operation, differential input must stay within ±2.048V/PGA, and common-mode voltage must remain between VSS and VDD.
Can MCP3426A1-E/MC operate from a 2.7V supply while maintaining full 16-bit performance?
Yes, the MCP3426A1-E/MC is fully specified from 2.7V to 5.5V. At 2.7V supply, it achieves 16-bit resolution at 15 SPS with 10 ppm INL, 135 µA typical supply current (continuous), and maintains –40°C to +125°C operation. The on-board 2.048V reference remains accurate (±0.05%) and stable (15 ppm/°C) across this entire voltage range.
MCP3426A1-E/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3426A1-E/MC FAQ
1.How can I place an order for MCP3426A1-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A1-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 MCP3426A1-E/MC reliable?
The price and inventory of MCP3426A1-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 MCP3426A1-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3426A1-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A1-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A1-E/MC?
MCP3426A1-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A1-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 MCP3426A1-E/MC?
For technical support, including MCP3426A1-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A1-E/MC requirements.
6.How does Aetrix verify that MCP3426A1-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3426A1-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 MCP3426A1-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3426A1-E/MC?
All MCP3426A1-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A1-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 MCP3426A1-E/MC part is unused and in its original packaging.
Return procedure for MCP3426A1-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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