My Inquiry
My Account
Microchip Technology MCP3422A2-E/SN
- Part No.:
- MCP3422A2-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MCP3422A2-E/SN.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP3422A2-E/SN from Microchip Technology is a 18-bit ΔΣ analog-to-digital converter with two differential input channels, on-board 2.048V reference (±0.05% accuracy), programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting up to 3.4 MHz. It delivers 10 ppm INL, 3.75–240 SPS data rates, and operates from 2.7V to 5.5V across –40°C to +125°C - used in high-precision RTD temperature sensing and bridge-based pressure transducers.
For engineers reviewing the MCP3422A2-E/SN datasheet, MCP3422A2-E/SN pinout, MCP3422A2-E/SN application, or MCP3422A2-E/SN equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and noise performance, real-world use cases in industrial sensor interfaces, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The MCP3422A2-E/SN implements a delta-sigma modulation architecture with integrated self-calibration of offset and gain per conversion, eliminating external calibration routines. Its switched-capacitor front-end uses a 3.2 pF sampling capacitor and supports differential or single-ended inputs per channel.
It integrates an on-board oscillator, 2.048V voltage reference (15 ppm/°C drift), and programmable gain amplifier - all operating from a single 2.7–5.5V supply. Conversion modes include one-shot (36 µA typical standby) and continuous (135 µA at 3V), with I²C address factory-programmed for fixed-device deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit (3.75 SPS), down to 12-bit (240 SPS); enables sub-µV detection in precision sensor systems |
| Differential Input Range | ±2.048V / PGA; full-scale range = 4.096V/PGA - matches standard bridge and thermistor excitation voltages |
| INL Error | 10 ppm of FSR (typical); ensures ≤0.001% linearity deviation over temperature and supply variation |
| Reference Accuracy | 2.048V ±0.05% (±1.02 mV); eliminates need for external reference in cost-sensitive instrumentation |
| Data Rates | 3.75 / 15 / 60 / 240 SPS; selectable via I²C config bits - balances resolution, noise, and system update latency |
| Supply Current | 135 µA (3V, continuous), 36 µA (3V, one-shot @1 SPS); enables battery-powered portable measurement |
| Operating Temp | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
Pinout & Package
The MCP3422A2-E/SN is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), rated θJA = 149.5°C/W. Pin 9 (EP) must be soldered to VSS for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+, CH1− | Differential analog input channel 1 | Supports true differential measurement or single-ended mode (CH1− tied to VSS); input impedance = 2.25 MΩ/PGA |
| CH2+, CH2− | Differential analog input channel 2 | Independent second channel; identical specs to CH1 - enables dual-sensor monitoring without multiplexer overhead |
| VDD, VSS | Power supply and ground | VDD accepts 2.7–5.5V; requires 0.1 µF ceramic + 10 µF tantalum bypassing; VSS must connect to analog ground plane |
| SDA, SCL | I²C bidirectional data and clock | Open-drain pins requiring 5–10 kΩ pull-ups; support Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes |
| EP | Exposed thermal pad | Internally connected to VSS; must be soldered to PCB ground pour for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Automatic offset and gain correction per conversion - removes need for periodic system recalibration in field-deployed equipment |
| Programmable gain amplifier | Gains of x1, x2, x4, x8 - allows direct digitization of mV-level signals from load cells or thermocouples without external op-amps |
| Low-noise performance | 1.5 µVRMS output noise (3.75 SPS, PGA=1); supports 18-bit ENOB in low-frequency sensor applications |
| Dual-channel differential inputs | Two independent, isolated input paths - enables simultaneous measurement of two sensors with common-mode rejection >105 dB |
| Single-supply operation | 2.7–5.5V range - compatible with Li-ion, USB, and industrial 3.3V/5V rails without level-shifting circuitry |
Applications
| RTD Temperature Monitoring | Strain Gauge Bridge Readout |
|---|---|
Use Scenario: Measuring platinum RTD (PT100/PT1000) resistance in HVAC controllers and process transmitters. IC Role / Device Role / Timing Role: ADC front-end converting ratiometric bridge voltage to 18-bit digital output via I²C; handles self-heating compensation through one-shot mode. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C using internal reference and PGA gain matching RTD excitation current. |
Use Scenario: Reading full-bridge strain gauges in industrial weighing scales and structural health monitoring nodes. IC Role / Device Role / Timing Role: Differential ADC capturing microvolt-level bridge imbalances; rejects common-mode noise from motor drives and EMI sources. Use Value: Delivers 10 ppm INL and >105 dB CMRR to resolve <0.001% full-scale deflection - critical for NTEP-certified scale designs. |
| Battery Fuel Gauging | Factory Automation Sensor Hub |
Use Scenario: Monitoring cell voltage and current sense shunt in portable medical devices and power tools. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously sampling voltage (CH1) and shunt voltage (CH2) for coulomb counting and SOC estimation. Use Value: 135 µA continuous current draw and 3.75 SPS 18-bit mode enable multi-week runtime on coin-cell batteries. |
Use Scenario: Centralized analog acquisition node collecting data from multiple pressure, flow, and temperature sensors on PLC backplanes. IC Role / Device Role / Timing Role: I²C slave device providing calibrated, timestamp-aligned readings to host MCU; supports daisy-chained addressing via fixed A2 address. Use Value: Factory-programmed I²C address (A2 variant) eliminates external address jumpers - simplifies BOM and reduces assembly defects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1120IPWR | 4-channel, 16-bit, SPI interface, no internal reference; requires external 2.048V ref or external PGA | Requires additional components for same functionality; better suited for SPI-based microcontrollers | Select when migrating to SPI architecture or needing four channels with shared PGA |
| MCP3421A2T-E/OT | Single-channel, same 18-bit resolution, identical I²C address (A2), same SOIC-8 package and pinout | Lacks second analog input - suitable only where single-sensor readout suffices | Choose for footprint-compatible upgrade path when reducing channel count lowers system cost |
Compared with ADS1120IPWR and MCP3421A2T-E/OT, the MCP3422A2-E/SN uniquely combines dual differential channels, factory-set I²C address, integrated reference, and PGA in a single SOIC-8 package - minimizing component count and layout complexity for compact, calibrated sensor nodes.
Availability
MCP3422A2-E/SN is available at Aetrix Electronics and suitable for RTD temperature monitoring, strain gauge bridge readout, and battery fuel gauging requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MCP3422A2-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, 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 calibration, low-noise performance, and simplified I²C interfacing.
FAQ
What is the I²C address of the MCP3422A2-E/SN?
The MCP3422A2-E/SN has a factory-programmed I²C address of 0x92 (10010010b) in 7-bit format, corresponding to the A2 variant. This fixed address eliminates external address pin configuration and ensures deterministic bus behavior in multi-device systems - a key advantage of the MCP3422A2-E/SN over variants with user-configurable Adr0/Adr1 pins.
Does the MCP3422A2-E/SN require external calibration?
No, the MCP3422A2-E/SN performs automatic self-calibration of offset and gain before every conversion, ensuring consistent accuracy across temperature and supply voltage variations. This built-in calibration eliminates the need for external trimming or system-level calibration routines - a core functional benefit of the MCP3422A2-E/SN in field-deployed instrumentation.
Can the MCP3422A2-E/SN measure single-ended signals?
Yes, the MCP3422A2-E/SN supports single-ended operation by connecting the negative input (e.g., CH1−) to VSS while applying the signal to the positive input (e.g., CH1+). The device maintains specified INL and noise performance in this mode, though common-mode rejection is reduced compared to true differential measurement - a valid configuration for the MCP3422A2-E/SN in cost-sensitive single-input applications.
What is the maximum input voltage the MCP3422A2-E/SN can tolerate?
The MCP3422A2-E/SN specifies an absolute maximum input voltage range of VSS − 0.3V to VDD + 0.3V per pin. Exceeding this range risks ESD diode conduction, leakage current, and potential damage. For safe operation, differential inputs must stay within ±2.048V/PGA, and common-mode voltage must remain between VSS and VDD - critical limits for robust MCP3422A2-E/SN integration in noisy industrial environments.
How does the PGA affect input impedance on the MCP3422A2-E/SN?
The MCP3422A2-E/SN's differential input impedance is inversely proportional to PGA setting: 2.25 MΩ at x1 gain, 1.125 MΩ at x2, 562.5 kΩ at x4, and 281.25 kΩ at x8. This relationship arises from the switched-capacitor front-end (3.2 pF sampling capacitor) and directly impacts required source impedance - low-impedance drivers (<100 Ω) are recommended to maintain specified INL and settling time for the MCP3422A2-E/SN.
MCP3422A2-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:
- 18
- Sampling Rate (Per Second):
- 3.75
- 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:
- -
MCP3422A2-E/SN FAQ
1.How can I place an order for MCP3422A2-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A2-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 MCP3422A2-E/SN reliable?
The price and inventory of MCP3422A2-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 MCP3422A2-E/SN is usually 5 days.
3.What payment methods are accepted for MCP3422A2-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A2-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A2-E/SN?
MCP3422A2-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A2-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 MCP3422A2-E/SN?
For technical support, including MCP3422A2-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A2-E/SN requirements.
6.How does Aetrix verify that MCP3422A2-E/SN is sourced from the original manufacturer or authorized distributors?
All MCP3422A2-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 MCP3422A2-E/SN meets industry standards.
7.What is the process for return or replacement of MCP3422A2-E/SN?
All MCP3422A2-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A2-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 MCP3422A2-E/SN part is unused and in its original packaging.
Return procedure for MCP3422A2-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP3422A2-E/SN Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
