MCP3421A0T-E/CH
MCP3421A0T-E/CH is a compact 18-bit single-channel delta-sigma ADC featuring differential input, I2C communication, internal reference, programmable gain, low-power operation, and a 2.7V to 5.5V supply range.
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- Part No.:
- MCP3421A0T-E/CH
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
- MCP3421A0T-E/CH.pdf
- Description:
- MCP3421A0T-E/CH is a compact 18-bit single-channel delta-sigma ADC featuring differential input, I2C communication, internal reference, programmable gain, low-power operation, and a 2.7V to 5.5V supply range.
- Quantity:
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Product Details
MCP3421A0T-E/CH 18-Bit Delta-Sigma ADC Engineering Guide
A practical engineering and sourcing review of the Microchip MCP3421A0T-E/CH single-channel 18-bit delta-sigma ADC, covering resolution, programmable gain, differential input range, I²C communication, power consumption, SOT-23-6 pinout, PCB design, applications and procurement considerations.
MCP3421A0T-E/CH Product Overview
The MCP3421A0T-E/CH is a single-channel, high-resolution delta-sigma analog-to-digital converter from Microchip Technology. It combines a differential analog input, programmable resolution up to 18 bits, an internal 2.048 V reference, a programmable gain amplifier and an I²C-compatible digital interface in a compact 6-lead SOT-23 package.
The ADC can be configured for 12-bit, 14-bit, 16-bit or 18-bit conversions. Conversion speed changes with resolution, allowing designers to choose between faster response and higher measurement resolution.
Its integrated PGA provides gain settings of ×1, ×2, ×4 and ×8, making the device useful for low-level differential signals from bridge sensors, load cells, temperature sensors and precision measurement circuits.
- 18-bit
- Maximum programmable ADC resolution
- 240 SPS
- Maximum conversion rate in 12-bit mode
- 2.7–5.5V
- Specified single-supply operating range
- ×1–×8
- Integrated programmable gain amplifier
MCP3421A0T-E/CH integrates functions that would otherwise require additional analog components, including a precision reference, PGA, internal oscillator and automatic offset/gain calibration. This can simplify compact precision measurement designs.
MCP3421A0T-E/CH Parameter Dashboard
The key MCP3421 parameters should be evaluated as a complete signal-chain system. Resolution, sample rate, PGA gain and differential input range are related, so choosing the highest nominal resolution alone does not guarantee the best application result.
Resolution and Conversion Rate
Low-Power Operating Reference
The 18-bit mode operates at 3.75 SPS, while the maximum 240 SPS rate corresponds to 12-bit operation. Select the configuration from actual bandwidth, noise and response-time requirements.
MCP3421 Delta-Sigma ADC Architecture
The MCP3421 signal path combines a differential analog input stage, programmable gain amplifier, delta-sigma converter, internal reference and digital interface. The integration reduces the number of precision external analog components required around the converter.
Differential Input
×1 / ×2 / ×4 / ×8
12–18 Bit
Digital Output
Differential Input Range
The specified differential input range is approximately ±2.048 V divided by the selected PGA gain. This means increasing PGA gain increases sensitivity to smaller differential signals but reduces the maximum measurable differential voltage.
| Parameter | Reference | Engineering Meaning |
|---|---|---|
| Architecture | Delta-Sigma ADC | Optimized for precision, low-bandwidth measurements. |
| Input Channels | 1 differential channel | VIN+ and VIN− form the analog measurement input. |
| Maximum Resolution | 18 bits | Highest selectable converter resolution. |
| Differential Range | ±2.048 V / PGA | Input full-scale range decreases as PGA gain increases. |
| Internal Reference | 2.048 V | Reduces the need for an external precision reference. |
| PGA Settings | ×1 / ×2 / ×4 / ×8 | Supports low-level sensor signal measurement. |
| Typical Output Noise | 1.5 µVrms | Reference value at 3.75 SPS, PGA = 1 and zero differential input. |
| INL Reference | 10 ppm typical | Typical integral nonlinearity reference under specified conditions. |
MCP3421A0T-E/CH I²C Interface & Address
The MCP3421 uses an I²C-compatible two-wire interface for configuration and conversion-data transfer. The MCP3421A0T-E/CH uses the factory-programmed A0 address option, where the selectable address bits A2:A1:A0 are 000.
A0 Address Visualization
Supports conventional I²C communication at up to 100 kHz.
Supports I²C Fast Mode communication at up to 400 kHz.
I²C High-Speed Mode can operate at up to 3.4 MHz under applicable conditions.
A0 identifies the 000 factory-programmed address-bit version of the MCP3421.
Before approving MCP3421A0T-E/CH for a board, check that address 0x68 does not conflict with another device on the same I²C bus.
MCP3421A0T-E/CH SOT-23-6 Pinout
The /CH package is a compact 6-lead SOT-23 package. Correct pin mapping is important because analog input, I²C signals and the power pins are all concentrated in a very small footprint.
| Pin | Symbol | Function |
|---|---|---|
| Pin 1 | VIN+ | Positive differential analog input. |
| Pin 2 | VSS | Ground and current-return connection. |
| Pin 3 | SCL | I²C serial clock input. |
| Pin 4 | SDA | Bidirectional I²C serial data connection. |
| Pin 5 | VDD | Positive supply voltage input. |
| Pin 6 | VIN− | Negative differential analog input. |
Power Supply and Decoupling
The MCP3421 VDD supply should remain within the specified 2.7 V to 5.5 V range. A local ceramic bypass capacitor should be placed close to the VDD and VSS pins to reduce supply noise.
The analog ground return should use a low-impedance connection. In precision sensor systems, careful separation of noisy digital return currents from the sensitive analog signal path can improve measurement quality.
MCP3421A0T-E/CH Engineering Verification
A nominal 18-bit ADC does not automatically provide 18-bit system accuracy. Final measurement quality depends on sensor noise, PCB layout, signal conditioning, PGA selection, source impedance, supply quality, temperature variation and conversion speed.
- Confirm that VDD remains between 2.7 V and 5.5 V under all operating conditions.
- Verify the differential input amplitude against the selected PGA gain.
- Check both differential input range and the absolute voltage applied to VIN+ and VIN−.
- Choose 18-bit / 3.75 SPS mode only when the resulting conversion time is acceptable.
- Use suitable pull-up resistors for SDA and SCL based on supply voltage, bus capacitance and speed.
- Place supply bypass components close to VDD and VSS.
- Route low-level analog signals away from clocks, switching regulators and other noisy digital nodes.
- Confirm firmware compatibility with the A0 0x68 I²C address before PCB production.
The complete analog signal chain should be evaluated. Sensor tolerance, input noise, gain error, offset, PCB leakage, interference and environmental conditions can dominate the final system error.
MCP3421A0T-E/CH Application Examples
The MCP3421 is especially useful for precision, low-bandwidth measurements where differential input, low noise and programmable gain are more important than very high sampling speed.
Weigh Scales
High resolution and programmable gain are useful for measuring low-level load-cell and bridge signals.
Temperature Measurement
Suitable for RTD, thermistor and thermocouple acquisition systems with appropriate signal conditioning.
Portable Instrumentation
Compact SOT-23-6 packaging and low current consumption support portable precision instruments.
Bridge Sensors
Useful for pressure, strain and force measurement where small differential outputs must be digitized.
Battery Monitoring
Precision voltage and current measurements can support battery and fuel-gauge designs.
Precision Data Acquisition
Integrated PGA and reference simplify low-bandwidth, high-resolution analog measurement channels.
MCP3421A0T-E/CH Ordering Code & Procurement Review
The complete MCP3421A0T-E/CH ordering code matters during purchasing. Selecting only by the base MCP3421 name can result in the wrong address option, packing format, temperature grade or package.
| Code | Meaning | Procurement Relevance |
|---|---|---|
| MCP3421 | Single-channel delta-sigma A/D converter | Base device family. |
| A0 | Address option A2:A1:A0 = 000 | Defines the fixed I²C address variant. |
| T | Tape-and-reel packing | Suitable for automated SMT production. |
| E | -40°C to +125°C temperature grade | Must match the required environmental range. |
| CH | 6-lead SOT-23 package | Defines the physical PCB footprint. |
| Full MPN | MCP3421A0T-E/CH | Use the complete MPN for BOM and purchasing control. |
Confirm that the A0 variant matches firmware and the I²C address plan.
Confirm /CH SOT-23-6 dimensions, orientation and PCB land pattern.
The E code identifies the extended -40°C to +125°C temperature range.
The T suffix identifies tape-and-reel packing for automated assembly.
MCP3421A0T-E/CH PCB, SMT & PCBA Design Review
Precision ADC performance is strongly influenced by board-level implementation. Careful grounding, supply decoupling, analog routing and digital-bus placement are important when designing around the MCP3421.
- 1
-
Footprint Review
Verify SOT-23-6 land pattern, pin-one orientation and library accuracy.
- 2
-
Analog Routing
Keep VIN+ and VIN− paths compact and away from noisy switching signals.
- 3
-
Power Integrity
Place local bypass capacitance close to VDD and provide a low-impedance ground return.
- 4
-
Production Test
Check I²C acknowledgement, device address, configuration and known analog conversion values.
I²C Pull-Up and Layout Considerations
SDA and SCL use open-drain signaling and therefore require pull-up resistors. Pull-up resistance should be selected according to bus voltage, capacitance, trace length and intended I²C clock speed.
For precision analog measurements, avoid routing high-current switching paths, DC/DC converter nodes or high-speed digital clocks close to VIN+ and VIN−.
Recommended MCP3421A0T-E/CH Selection Flow
ADC selection should begin with the real sensor signal rather than the nominal bit count. The most useful MCP3421 configuration depends on input amplitude, bandwidth, noise level, acceptable conversion time and power budget.
- Determine the minimum and maximum sensor differential voltage.
- Select the highest useful PGA gain without saturating the ADC.
- Choose conversion resolution according to required response time.
- Confirm 0x68 does not conflict with another I²C device.
- Check VDD and I²C pull-up compatibility with the host controller.
- Validate measurement noise and accuracy using real production hardware.
MCP3421A0T-E/CH Engineering & Procurement Notice
This MCP3421A0T-E/CH engineering guide is intended for component evaluation, circuit planning, BOM review and sourcing reference. Final electrical design approval should use the applicable Microchip MCP3421 documentation together with project-specific requirements.
The nominal 18-bit resolution should not be interpreted as guaranteed 18-bit end-system accuracy. Actual performance depends on input signal quality, source impedance, sensor accuracy, selected PGA, reference characteristics, PCB layout, power supply, grounding, environmental conditions and software configuration.
The complete MCP3421A0T-E/CH ordering code should be retained for production purchasing because the address option, tape-and-reel packing, temperature grade and SOT-23-6 package are part of the required orderable configuration.
Technical Reference Basis
Key technical data in this page is based on the Microchip MCP3421 18-Bit Analog-to-Digital Converter with I²C Interface and Onboard Reference data sheet. Always confirm the applicable manufacturer documentation before schematic release, PCB production or volume purchasing.
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MCP3421A0T-E/CH Technical Information
- Specifications
- FAQ
- Hot Sale
- Related Products
Specifications
- Product Attributes
- Attribute Value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 3.75
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- I2C
- Configuration:
- 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:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
FAQ
1. How to order MCP3421A0T-E/CH on Flychip?
You can submit an RFQ directly on this page. Our sales team will review your quantity, delivery requirements and target price, then reply with a quotation as soon as possible.
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We work with qualified channels including international chip manufacturers and well-known distributors. Our team pays close attention to supplier review, traceability, product condition and quality control.
3. Are the price and inventory of MCP3421A0T-E/CH updated in real time?
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Please contact our sales team within the specified period if there are quantity differences, wrong items, or clear external defects. The product should remain unused and in its original packaging.
7. Can I request technical support for MCP3421A0T-E/CH?
Yes. You can contact us for datasheet, package details, pin information and sourcing assistance related to MCP3421A0T-E/CH.
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MCP3421A0T-E/CH Sourcing & Technical Support
MCP3421A0T-E/CH is supplied by Microchip Technology. This page provides key purchasing information including manufacturer, package, datasheet, stock reference, price reference and RFQ support.
As your reliable partner for semiconductor solutions, Flychip supports customers from research and development to mass production with electronic component supply, BOM sourcing, PCB, SMT and PCBA solutions.
Our sourcing partners include international chip manufacturers and well-known distributors. With rich experience in channel management, quality control and sales management, Flychip helps customers accelerate product development and delivery.
- Part Number
- MCP3421A0T-E/CH
- Manufacturer
- Microchip Technology
- Package
- SOT-23-6
- Category
- Analog to Digital Converters (ADC)
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