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Microchip Technology MCP3424T-E/ST
- Part No.:
- MCP3424T-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3424T-E/ST.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
MCP3424T-E/ST from Microchip Technology is a 18-bit, 4-channel delta-sigma analog-to-digital converter with differential inputs, 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 bridge sensing and RTD-based temperature monitoring.
For engineers reviewing the MCP3424T-E/ST datasheet, MCP3424T-E/ST pinout, MCP3424T-E/ST application, or MCP3424T-E/ST equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Microchip's DS22088C specification.
Technical Context
The MCP3424T-E/ST implements a fully integrated ΔΣ ADC architecture with internal oscillator, self-calibrating offset/gain per conversion, and a switched-capacitor input stage using a 3.2 pF sampling capacitor. Its four differential input channels feed into a single-core conversion engine shared via multiplexer, enabling channel-selectable acquisition without external switching.
Each conversion includes automatic calibration against the on-board 2.048V reference, ensuring stability over temperature (15 ppm/°C drift) and supply variation (5 ppm/V). The PGA precedes the modulator, allowing weak signals (e.g., µV-level thermocouple outputs) to be amplified before digitization while preserving 18-bit ENOB at 3.75 SPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit effective (no missing codes), with selectable 12/14/16/18-bit modes - enables trade-off between speed (240 SPS @ 12-bit) and precision (3.75 SPS @ 18-bit). |
| Differential Input Range | ±2.048V / PGA - full-scale range scales inversely with gain; e.g., ±256 mV at PGA=8, enabling direct digitization of low-level sensor outputs. |
| INL Error | 10 ppm of FSR (typical) - translates to <±0.8 LSB error at 18-bit resolution, critical for metrology-grade weigh scale and pressure transducer applications. |
| Data Rate Options | 3.75 / 15 / 60 / 240 SPS - each rate includes full auto-calibration cycle; 3.75 SPS mode achieves 1.5 µVRMS output noise for ultra-low-noise measurements. |
| Supply Current | 135 µA (typ, VDD=3V, continuous) or 36 µA (typ, one-shot @ 1 SPS) - supports battery-powered portable instrumentation with multi-year runtime. |
| I²C Interface | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes; two user-configurable address pins (Adr0/Adr1) support up to 8 device addresses on same bus. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive sensors, industrial PLC analog input modules, and factory automation equipment. |
Pinout & Package
The MCP3424T-E/ST is housed in a 14-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch) with exposed thermal pad (EP) internally connected to VSS. Pin 1 is CH1+, pin 14 is CH4–, and EP must be soldered to a VSS-connected copper pour for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ / CH1– CH2+ / CH2– CH3+ / CH3– CH4+ / CH4– |
Differential analog input pairs for channels 1–4 | Support true differential measurement or single-ended (CHn– tied to VSS); input voltage range limited to VSS−0.3V to VDD+0.3V to avoid ESD diode conduction. |
| VDD / VSS | Power supply and ground | VDD requires 0.1 µF ceramic + 10 µF tantalum bypassing; VSS must connect to low-impedance analog ground plane to minimize noise coupling into sensitive inputs. |
| SDA / SCL | I²C bidirectional data and clock | Open-drain pins requiring pull-ups (5–10 kΩ for standard/fast mode); SCL rising edge clocks data into device, falling edge clocks data out. |
| Adr0 / Adr1 | I²C address selection inputs | Configurable logic levels (VSS = low, VDD = high, floating ≈ VDD/2) set one of eight possible slave addresses - no external EEPROM or configuration memory needed. |
Key Features
| Feature | Design Value |
|---|---|
| On-board 2.048V reference | ±0.05% initial accuracy and 15 ppm/°C drift - eliminates need for external precision reference, reducing BOM count and layout area in space-constrained designs. |
| Programmable Gain Amplifier (PGA) | Gains of x1/x2/x4/x8 - allows direct digitization of microvolt-level signals (e.g., load cell outputs) without external op-amp stages, lowering noise and component count. |
| Per-conversion self-calibration | Automatic offset and gain correction before every sample - maintains accuracy across temperature swings and supply fluctuations without host MCU intervention. |
| Low-power standby mode | <1 µA typical current draw - enables wake-on-command operation in energy-sensitive applications like wireless sensor nodes and battery fuel gauges. |
| Differential input architecture | Common-mode rejection ≥105 dB (DC, PGA=1) - rejects noise common to both inputs (e.g., EMI on long sensor cables), improving signal integrity in noisy industrial environments. |
Applications
| Bridge Sensing | RTD Temperature Monitoring |
|---|---|
|
Use Scenario: Strain gauge or pressure transducer bridge outputs in factory automation systems, where excitation voltage drift and thermal EMFs degrade measurement fidelity. IC Role / Device Role / Timing Role: Four-channel differential ADC acquires ratiometric bridge voltages with simultaneous PGA scaling and internal reference - eliminating external excitation and reference dependencies. Use Value: Achieves <±0.02% full-scale linearity error over –40°C to +85°C, enabling sub-0.1% pressure accuracy without system-level calibration. |
Use Scenario: Precision 3-wire or 4-wire Pt100 RTD measurements in HVAC controllers and medical thermometers, where lead resistance and self-heating introduce errors. IC Role / Device Role / Timing Role: Uses channel multiplexing and programmable gain to implement Kelvin sensing and current-source excitation control via external circuitry, synchronized to ADC conversion timing. Use Value: Delivers 0.1°C temperature resolution at 3.75 SPS with 1.5 µVRMS noise floor - sufficient for Class A RTD accuracy without oversampling or digital filtering. |
| Weigh Scale Front-End | Battery Fuel Gauge |
|
Use Scenario: High-resolution load cell readout in commercial kitchen scales and industrial platform scales, where mechanical vibration and thermal gradients cause zero drift. IC Role / Device Role / Timing Role: Performs continuous 16-bit conversions at 15 SPS with automatic offset calibration, feeding filtered data to host MCU for digital compensation algorithms. Use Value: 10 ppm INL and 50 nV/°C offset drift ensure stable zero point over ambient shifts - reduces recalibration frequency from daily to quarterly in field-deployed units. |
Use Scenario: Coulomb counting in lithium-ion battery packs for portable power tools and medical devices, where voltage sag under load masks true state-of-charge. IC Role / Device Role / Timing Role: Measures shunt voltage differentially across high-side current sense resistor at 240 SPS (12-bit), rejecting common-mode noise from motor commutation or switching regulators. Use Value: 2.7V to 5.5V single-supply operation allows direct connection to battery rail; 36 µA one-shot current extends gauge runtime during idle periods between charge/discharge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS114S08BIPW | 16-bit, 12-channel, integrated sensor excitation and burn-out detection; no on-board reference; SPI interface only. | Requires external 2.048V reference and level-shifting for 3.3V I²C buses; better suited for multi-sensor systems needing excitation control. | Select ADS114S08BIPW when integrating multiple RTDs or thermistors with programmable current sources - not for drop-in replacement of MCP3424T-E/ST. |
| MCP3421A0T-E/OT | Single-channel, 18-bit, identical reference and PGA specs; SOIC-8 package; fixed I²C address (0x68); no address pins. | Limited to one differential input; lacks channel multiplexing and address flexibility - suitable only for point-sensor applications. | Choose MCP3421A0T-E/OT for cost-sensitive single-input designs where board space and I²C address conflict are non-issues. |
Compared with ADS114S08BIPW and MCP3421A0T-E/OT, the MCP3424T-E/ST uniquely balances 4-channel flexibility, on-board reference, I²C address configurability, and ultra-low power - making it optimal for compact, multi-sensor industrial front-ends where layout area and firmware complexity must be minimized.
Availability
MCP3424T-E/ST is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, and battery-powered IoT sensor nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MCP3424T-E/ST 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 robust, low-power, and highly integrated solutions for industrial and automotive markets.
The MCP342X family was designed specifically for high-accuracy, low-noise sensor signal conditioning in space- and power-constrained applications - emphasizing integrated references, self-calibration, and flexible I²C configuration to reduce system-level design effort.
FAQ
What is the maximum sampling rate of the MCP3424T-E/ST at full 18-bit resolution?
The MCP3424T-E/ST achieves 3.75 samples per second (SPS) in its highest-resolution 18-bit mode. This rate includes full on-chip offset and gain calibration for each conversion, ensuring measurement integrity without host software overhead. At lower resolutions, it supports 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit), all with identical calibration coverage. The MCP3424T-E/ST does not support oversampling beyond these four fixed rates.
Does the MCP3424T-E/ST require an external voltage reference?
No, the MCP3424T-E/ST integrates a precision 2.048V voltage reference with ±0.05% initial accuracy and 15 ppm/°C drift - eliminating the need for external reference components. This internal reference sets the full-scale differential input range as ±2.048V/PGA and is used exclusively for ADC conversion; it is not accessible as an output pin and cannot be overridden or bypassed.
How many I²C addresses can be configured on the MCP3424T-E/ST?
The MCP3424T-E/ST supports eight unique I²C slave addresses via two hardware-configurable pins: Adr0 and Adr1. Each pin accepts VSS (logic low), VDD (logic high), or floating (≈VDD/2), yielding combinations that map to addresses 0x68–0x6F. This enables up to eight MCP3424T-E/ST devices on a single I²C bus without address conflicts - a capability not present in the single-address MCP3421 or factory-programmed MCP3422 variants.
Can the MCP3424T-E/ST perform single-ended measurements?
Yes, the MCP3424T-E/ST supports single-ended operation by connecting the CHn– input of any channel to VSS (ground), while applying the signal to CHn+. However, doing so sacrifices common-mode rejection and halves the effective input range compared to true differential mode. The device retains its full 18-bit resolution and calibration features in single-ended mode, but INL and noise performance may degrade slightly due to reduced CMRR and increased sensitivity to ground noise.
What is the thermal pad (EP) connection requirement for the MCP3424T-E/ST?
The exposed thermal pad (EP) on the MCP3424T-E/ST is internally bonded to VSS and must be soldered to a VSS-connected copper pour on the PCB. This connection is mandatory for both thermal dissipation (θJA = 100°C/W in TSSOP) and electrical stability - floating or unconnected EP increases junction temperature and may induce ground bounce or reference instability during high-speed conversions.
MCP3424T-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 3.75
- Number of Inputs:
- 4
- 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, Selectable Address
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 14-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3424T-E/ST FAQ
1.How can I place an order for MCP3424T-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3424T-E/ST 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 MCP3424T-E/ST reliable?
The price and inventory of MCP3424T-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3424T-E/ST is usually 5 days.
3.What payment methods are accepted for MCP3424T-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3424T-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3424T-E/ST?
MCP3424T-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3424T-E/ST 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 MCP3424T-E/ST?
For technical support, including MCP3424T-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3424T-E/ST requirements.
6.How does Aetrix verify that MCP3424T-E/ST is sourced from the original manufacturer or authorized distributors?
All MCP3424T-E/ST 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 MCP3424T-E/ST meets industry standards.
7.What is the process for return or replacement of MCP3424T-E/ST?
All MCP3424T-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3424T-E/ST, 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 MCP3424T-E/ST part is unused and in its original packaging.
Return procedure for MCP3424T-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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