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Microchip Technology MCP3427T-E/MF
- Part No.:
- MCP3427T-E/MF
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP3427T-E/MF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP3427T-E/MF 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 across –40°C to +125°C - used in precision bridge sensing and RTD-based temperature monitoring.
For engineers reviewing the MCP3427T-E/MF datasheet, MCP3427T-E/MF pinout, MCP3427T-E/MF application, or MCP3427T-E/MF equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with functional differences, and supply support for industrial embedded systems requiring stable, high-accuracy ADC sourcing.
Technical Context
The MCP3427T-E/MF implements a delta-sigma architecture with integrated oscillator, self-calibrating offset/gain per conversion, and a switched-capacitor front-end sampling at 3.2 pF. Its dual-channel multiplexer routes CH1± or CH2± to a single ΔΣ modulator core.
It uses an on-board 2.048V reference to define ±2.048V differential full-scale range (FSR = 4.096V/PGA), enabling direct measurement of low-level sensor outputs. The PGA gain setting directly scales input sensitivity and affects differential input impedance (2.25 MΩ/PGA) and noise performance (2.5 µVRMS at 15 SPS, 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 - trade-off between precision and update speed for slow-varying sensor signals. |
| Differential Input FSR | ±2.048V / PGA - sets maximum measurable voltage difference before saturation; e.g., ±256 mV at PGA=8. |
| INL | 10 ppm of FSR - ensures ≤±0.66 LSB error over full scale at 16-bit mode, critical for calibration-critical weigh scales. |
| Supply Current (16-bit, 1-SHP) | 9 µA typical at VDD=3V - enables ultra-low-power battery operation in portable instrumentation. |
| I²C Address Pins | Adr0 and Adr1 support 8 configurable addresses via VDD/VSS/floating - allows multiple MCP3427T-E/MF devices on same bus without address conflict. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive sensors and industrial process control environments. |
| Reference Accuracy | 2.048V ±0.05% (±1.024 mV) - eliminates need for external reference in cost-sensitive designs while maintaining <0.1% system gain error. |
Pinout & Package
The MCP3427T-E/MF is housed in a 10-pin DFN (3×3 mm) package with exposed thermal pad (EP) internally connected to VSS. Pin 1 is marked by a dot; EP must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CH1+ | Differential positive input, Channel 1 | Accepts signal source for first differential pair; supports single-ended use when CH1– tied to VSS. |
| 2: CH1– | Differential negative input, Channel 1 | Completes differential pair with CH1+; common-mode voltage must stay within VSS–0.3V to VDD+0.3V. |
| 3: CH2+ | Differential positive input, Channel 2 | Second independent differential input path; shares same ΔΣ core and PGA as CH1. |
| 4: CH2– | Differential negative input, Channel 2 | Enables simultaneous dual-sensor monitoring (e.g., temperature + pressure) with channel switching via I²C. |
| 5: VSS | Ground reference and current return | Must connect to low-impedance analog ground; EP ties internally to VSS for thermal dissipation. |
| 6: VDD | Positive supply (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum bypassing; powers internal reference, PGA, and digital logic. |
| 7: SDA | I²C bidirectional data line | Open-drain output/input; needs pull-up resistor (5–10 kΩ); transmits conversion results and receives config commands. |
| 8: SCL | I²C serial clock input | Open-drain input; accepts external clock up to 3.4 MHz; timing defines data setup/hold requirements. |
| 9: Adr0 | I²C address selection bit 0 | Configures LSB of 3-bit address; logic low/high/floating selects among 8 possible bus addresses. |
| 10: Adr1 | I²C address selection bit 1 | Configures MSB of 3-bit address; combined with Adr0, enables multi-device I²C topology without hardware jumpers. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset and gain per conversion | Eliminates need for external calibration routines; maintains accuracy over temperature drift and supply variation without user intervention. |
| On-board 2.048V reference (15 ppm/°C drift) | Reduces BOM count and layout area; reference stability contributes directly to <0.1% total gain error across –40°C to +125°C. |
| Programmable PGA (x1/x2/x4/x8) | Enables direct digitization of microvolt-level signals from strain gauges or thermocouples without external amplification stages. |
| One-shot conversion mode | Draws only 0.56 µA in 12-bit standby - ideal for wake-on-event sensor nodes where average power must stay below 1 µA. |
| Differential input structure with 3.2 pF sampling capacitor | Defines dynamic input impedance (2.25 MΩ/PGA); requires low-source-impedance signal conditioning to avoid INL degradation. |
Applications
| Bridge Sensing | RTD Temperature Monitoring |
|---|---|
Use Scenario: Precision measurement of millivolt-level output from Wheatstone bridge pressure or load cells in factory automation equipment. IC Role / Device Role / Timing Role: Dual-channel differential ADC acquires synchronized bridge readings; PGA x8 amplifies weak signals while rejecting common-mode noise. Use Value: 16-bit resolution and 10 ppm INL enable <0.02% full-scale accuracy - sufficient for Class III legal-for-trade weighing systems. |
Use Scenario: High-stability temperature measurement using Pt100 RTDs in HVAC controllers or medical diagnostic devices. IC Role / Device Role / Timing Role: Converts ratiometric RTD voltage (with precision current source) into digital code; on-board reference ensures consistent scaling. Use Value: Integrated 2.048V reference and self-calibration eliminate external reference drift errors, achieving ±0.1°C accuracy over –40°C to +125°C. |
| Portable Battery Fuel Gauging | Thermocouple Signal Conditioning |
Use Scenario: Low-power state-of-charge estimation in handheld test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Measures battery voltage and current-sense shunt voltage in one-shot mode to minimize active time and extend runtime. Use Value: 9 µA typical current at 16-bit one-shot mode enables >1-year battery life on coin-cell power when sampling every 10 seconds. |
Use Scenario: Cold-junction compensated thermocouple readout in industrial ovens or kilns with wide ambient temperature swings. IC Role / Device Role / Timing Role: Digitizes thermocouple mV output (with PGA x4) while simultaneously measuring onboard die temperature for CJC compensation. Use Value: Dual-channel capability allows concurrent thermocouple + temperature sensor acquisition - no multiplexing delay or timing skew between measurements. |
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, no on-board reference; requires external 2.048V ref; higher 860 µA supply current in continuous mode. | Lacks integrated reference and self-calibration - demands more board space and firmware overhead for calibration. | Choose when needing four channels and external reference already exists in system; avoid if minimizing BOM or calibration effort is priority. |
| MCP3421A0T-E/CH | Single-channel, identical 16-bit ΔΣ core, same PGA/ref/I²C features; 8-pin SOT-23 package. | Cannot monitor two sensors simultaneously; lacks Adr0/Adr1 pins - fixed I²C address limits multi-device configurations. | Choose for space-constrained single-sensor applications where dual-channel capability is unnecessary and board area is premium. |
Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the MCP3427T-E/MF uniquely balances dual-channel flexibility, integrated reference, self-calibration, and ultra-low-power one-shot operation - making it optimal for compact, calibration-free, multi-sensor industrial endpoints.
Availability
MCP3427T-E/MF is available at Aetrix Electronics and suitable for precision bridge sensing, RTD temperature monitoring, and portable battery fuel gauging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3427T-E/MF 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 components, and interface ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal acquisition in industrial, automotive, and portable instrumentation - emphasizing integration, calibration autonomy, and robustness across harsh operating conditions.
FAQ
What is the maximum differential input voltage range for MCP3427T-E/MF at PGA=4?
The MCP3427T-E/MF has a fixed ±2.048V internal reference. At PGA=4, the maximum differential input voltage is ±2.048V ÷ 4 = ±512 mV. Exceeding this causes saturation (output code locks at 011...111 or 100...000). This range is defined by Equation 4-1 in the datasheet and applies regardless of VDD level within 2.7–5.5V.
Does MCP3427T-E/MF require an external crystal or oscillator?
No, the MCP3427T-E/MF contains a fully integrated on-board oscillator and does not require any external timing components. This oscillator drives the ΔΣ modulator and supports all three I²C speed modes (100 kHz, 400 kHz, 3.4 MHz) without external dependencies - simplifying layout and reducing BOM cost.
How does the self-calibration function work in MCP3427T-E/MF?
The MCP3427T-E/MF performs automatic offset and gain calibration before each conversion cycle. It measures internal zero-input and full-scale references, then adjusts digital output codes in real time. This occurs transparently - no host intervention needed - and ensures stable accuracy across temperature shifts and supply fluctuations without firmware calibration routines.
Can MCP3427T-E/MF operate with a 2.5V supply voltage?
No, the MCP3427T-E/MF specifies a minimum VDD of 2.7V. Operation below 2.7V violates Absolute Maximum Ratings and may cause undefined behavior, including failure to initialize POR, incorrect reference generation, or invalid conversion results. Systems requiring 2.5V operation should select alternate ADCs rated down to that voltage.
What is the purpose of the exposed thermal pad (EP) on MCP3427T-E/MF?
The exposed thermal pad (EP) on the MCP3427T-E/MF is electrically connected to VSS and serves dual purposes: thermal dissipation (reducing θJA to 57°C/W in DFN package) and improved grounding. It must be soldered to a PCB copper pour tied to VSS - floating or unconnected EP degrades thermal performance and may introduce noise coupling into analog measurements.
MCP3427T-E/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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, Selectable Address
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3427T-E/MF FAQ
1.How can I place an order for MCP3427T-E/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3427T-E/MF 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 MCP3427T-E/MF reliable?
The price and inventory of MCP3427T-E/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3427T-E/MF is usually 5 days.
3.What payment methods are accepted for MCP3427T-E/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3427T-E/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3427T-E/MF?
MCP3427T-E/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3427T-E/MF 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 MCP3427T-E/MF?
For technical support, including MCP3427T-E/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3427T-E/MF requirements.
6.How does Aetrix verify that MCP3427T-E/MF is sourced from the original manufacturer or authorized distributors?
All MCP3427T-E/MF 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 MCP3427T-E/MF meets industry standards.
7.What is the process for return or replacement of MCP3427T-E/MF?
All MCP3427T-E/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP3427T-E/MF, 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 MCP3427T-E/MF part is unused and in its original packaging.
Return procedure for MCP3427T-E/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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