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Microchip Technology MCP3426A1-E/MS
- Part No.:
- MCP3426A1-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP3426A1-E/MS.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,467
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Product details
Overview
MCP3426A1-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, 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 and portable instrumentation.
For engineers reviewing the MCP3426A1-E/MS datasheet, MCP3426A1-E/MS pinout, MCP3426A1-E/MS application, or MCP3426A1-E/MS equivalent, key selection considerations include its factory-programmed I²C address, MSOP-8 package with exposed thermal pad, self-calibrating offset/gain per conversion, and differential input full-scale range of ±2.048V/PGA - critical for RTD, thermocouple, and bridge sensor interfacing.
Technical Context
The MCP3426A1-E/MS implements a delta-sigma modulation architecture with integrated 3.2 pF sampling capacitor, on-chip oscillator, and sinc³ digital filter. Its input stage uses switched-capacitor topology with differential input impedance of 2.25 MΩ/PGA during conversion, enabling high-resolution measurement of low-level signals without external amplification when PGA gain is applied.
Each conversion includes automatic offset and gain calibration using the internal 2.048V reference, ensuring stability over temperature (±50 nV/°C offset drift, ±15 ppm/°C VREF drift) and supply variation (±5 ppm/V gain vs. VDD). The device supports one-shot mode (as low as 0.56 µA standby current) and continuous conversion, with output data formatted as two's complement binary via I²C.
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; no missing codes guaranteed. |
| Differential Input Range | ±2.048V / PGA - enables ±256 mV full-scale at x8 gain for microvolt-level thermocouple signals. |
| INL Error | 10 ppm of full-scale range - translates to ±0.67 LSB error at 16-bit resolution, critical for metrology-grade accuracy. |
| Supply Current | 135 µA typical (3V, continuous); 0.56 µA typical (12-bit one-shot) - supports battery-powered portable instrumentation. |
| I²C Interface | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes - compatible with legacy and high-throughput host controllers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC analog input modules. |
| Reference Accuracy | 2.048V ±0.05% (±1.02 mV) - eliminates need for external precision reference in cost-sensitive designs. |
Pinout & Package
The MCP3426A1-E/MS is housed in an 8-pin MSOP package (3.0 × 4.9 mm) with exposed thermal pad (EP) electrically connected to VSS and requiring PCB solder connection for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CH1+) | Differential analog input, channel 1 positive | Accepts signal up to VDD+0.3V; used with CH1– for true differential measurement or referenced to VSS for single-ended. |
| 2 (CH1–) | Differential analog input, channel 1 negative | Common-mode voltage must stay within VSS–0.3V to VDD+0.3V; forms 3.2 pF switched-capacitor input pair with CH1+. |
| 3 (CH2+) | Differential analog input, channel 2 positive | Independent second channel; identical electrical specs to CH1+, supports multiplexed dual-sensor acquisition. |
| 4 (CH2–) | Differential analog input, channel 2 negative | Paired with CH2+; enables ratiometric measurements when both channels share same reference source. |
| 5 (VSS) | Analog/digital ground reference | Must connect to low-impedance analog ground plane; EP pad ties internally to VSS for thermal dissipation. |
| 6 (VDD) | Positive supply rail | 2.7V–5.5V operation; requires 0.1 µF ceramic + 10 µF tantalum decoupling per datasheet layout guidelines. |
| 7 (SDA) | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ) to VDD; transmits 16-/14-/12-bit two's complement codes. |
| 8 (SCL) | I²C serial clock input | Open-drain input; accepts external clock edges; timing compliant with I²C standard/fast/high-speed specifications. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset and gain | Per-conversion calibration eliminates system-level drift compensation firmware and improves long-term measurement repeatability. |
| On-board 2.048V reference | ±0.05% initial accuracy and 15 ppm/°C drift enable stable full-scale definition without external reference components. |
| Programmable gain amplifier (x1/x2/x4/x8) | Extends effective input range from ±2.048V down to ±256 mV, allowing direct digitization of low-output sensors like strain gauges. |
| One-shot conversion mode | Reduces average current to sub-microamp levels (0.56 µA at 12-bit), extending battery life in portable data loggers. |
| Differential input architecture | 105–110 dB common-mode rejection suppresses noise in noisy industrial environments, improving SNR for bridge sensors. |
Applications
| Temperature Sensing | Bridge-Based Sensing |
|---|---|
|
Use Scenario: Measuring resistance change in Pt100 RTDs or NTC thermistors using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Dual-channel differential ADC acquires both sensor voltage and reference voltage simultaneously to cancel supply and reference drift. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C without external calibration, leveraging on-board reference and self-calibration. |
Use Scenario: Reading output of Wheatstone bridge pressure transducers with millivolt-level full-scale outputs. IC Role / Device Role / Timing Role: Configured at x8 PGA gain to resolve ±256 mV differential input, digitizing bridge imbalance with 16-bit resolution. Use Value: Delivers <10 ppm INL and 2.5 µVRMS noise floor, enabling <0.05% FS pressure measurement accuracy. |
| Weigh Scale Front-End | Battery Fuel Gauging |
|
Use Scenario: Interfacing load cell outputs in industrial platform scales requiring high linearity and temperature stability. IC Role / Device Role / Timing Role: Uses CH1+/CH1– and CH2+/CH2– for dual-load-cell monitoring or temperature-compensated single-cell readout. Use Value: 16-bit resolution at 15 SPS provides >90 dB dynamic range, resolving sub-gram changes in 100 kg capacity systems. |
Use Scenario: Monitoring battery cell voltage and current-sense shunt voltage in multi-cell Li-ion packs for state-of-charge estimation. IC Role / Device Role / Timing Role: One-shot mode reads shunt voltage (CH1) and cell voltage (CH2) sequentially with ultra-low quiescent current. Use Value: 0.56 µA standby current extends shelf life of battery-powered IoT devices; ±30 µV offset ensures <1 mV voltage accuracy. |
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. | Lacks integrated reference and self-calibration; higher system BOM cost and calibration effort required. | Select when needing four channels and comparator functionality, but accept added design complexity for reference and calibration. |
| MCP3421A0T-E/OT | Single-channel, SOT-23-6 package, same 16-bit resolution and I²C interface; factory-set I²C address differs (0x68 vs. 0x69). | Lower channel count limits use to single-sensor applications; smaller footprint suits space-constrained designs. | Choose for compact, single-input systems where board area is critical and dual-channel capability is unnecessary. |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3426A1-E/MS uniquely integrates reference, PGA, and per-conversion calibration in an MSOP-8 package - reducing component count and calibration overhead for dual-sensor industrial sensing.
Availability
MCP3426A1-E/MS is available at Aetrix Electronics and suitable for industrial automation equipment, portable instrumentation, and battery-powered sensor nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP3426A1-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, 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 cost-constrained embedded systems - emphasizing integrated reference, self-calibration, and I²C simplicity.
FAQ
What is the factory-programmed I²C address of the MCP3426A1-E/MS?
The MCP3426A1-E/MS has a fixed I²C address of 0x69 (1011001b), programmed during manufacturing and not configurable via external pins. This differs from the MCP3427/MCP3428, which use Adr0/Adr1 pins for address selection. The address is verified in Section 5.3.1 of DS22226A and remains constant across all operating conditions and configurations of the MCP3426A1-E/MS.
Does the MCP3426A1-E/MS require external calibration for production use?
No, the MCP3426A1-E/MS performs automatic offset and gain calibration before each conversion using its internal 2.048V reference, eliminating the need for external calibration routines or factory trim steps. This self-calibration ensures consistent 10 ppm INL and ±30 µV offset performance across –40°C to +125°C without user intervention - a core feature confirmed in Sections 4.8 and 1.0 of DS22226A for the MCP3426A1-E/MS.
Can the MCP3426A1-E/MS operate with a 2.7V supply while maintaining 16-bit accuracy?
Yes, the MCP3426A1-E/MS is fully specified for 2.7V to 5.5V operation, including all 16-bit performance parameters. At 2.7V, typical supply current is 135 µA in continuous mode and 0.56 µA in 12-bit one-shot mode. Electrical characteristics such as INL (10 ppm), offset error (30 µV), and reference accuracy (±0.05%) remain valid per DS22226A-page 5, confirming full 16-bit functionality at minimum VDD for the MCP3426A1-E/MS.
How does the exposed thermal pad (EP) on the MCP3426A1-E/MS package function electrically?
The exposed thermal pad (EP) on the MCP3426A1-E/MS is internally connected to VSS and must be soldered to a PCB copper pour tied to the analog ground plane. It serves both thermal dissipation (θJA = 211°C/W for MSOP-8) and electrical grounding - reducing noise coupling and improving PSRR. DS22226A-page 11 explicitly states "EP must be connected to VSS", and failure to do so risks degraded EMI immunity and thermal runaway under sustained 15 SPS operation of the MCP3426A1-E/MS.
What is the maximum differential input voltage the MCP3426A1-E/MS can safely measure at x8 PGA gain?
At x8 PGA gain, the MCP3426A1-E/MS supports a maximum differential input voltage of ±256 mV (±2.048V ÷ 8), corresponding to full-scale range. Exceeding this causes saturation (all 0s or all 1s except sign bit). Critically, absolute pin voltage must remain within VSS–0.3V to VDD+0.3V regardless of PGA setting - so at 3.3V supply, CH1+/CH1– must stay between –0.3V and +3.6V, verified in Table 3-1 and Section 4.5.2 of DS22226A for the MCP3426A1-E/MS.
MCP3426A1-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3426A1-E/MS FAQ
1.How can I place an order for MCP3426A1-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3426A1-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 MCP3426A1-E/MS reliable?
The price and inventory of MCP3426A1-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 MCP3426A1-E/MS is usually 5 days.
3.What payment methods are accepted for MCP3426A1-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3426A1-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3426A1-E/MS?
MCP3426A1-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3426A1-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 MCP3426A1-E/MS?
For technical support, including MCP3426A1-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3426A1-E/MS requirements.
6.How does Aetrix verify that MCP3426A1-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP3426A1-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 MCP3426A1-E/MS meets industry standards.
7.What is the process for return or replacement of MCP3426A1-E/MS?
All MCP3426A1-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3426A1-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 MCP3426A1-E/MS part is unused and in its original packaging.
Return procedure for MCP3426A1-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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