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Microchip Technology MCP3221A3T-E/OT
- Part No.:
- MCP3221A3T-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP3221A3T-E/OT.pdf
- Description:
- IC ADC 12BIT SAR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
MCP3221A3T-E/OT from Microchip Technology is a 12-bit successive approximation ADC with I²C interface, single-ended analog input, on-chip sample-and-hold, and internal conversion clock. It operates from 2.7V to 5.5V, draws ≤250 µA during conversion and ≤1 µA in standby, and delivers up to 22.3 ksps in Fast Mode (400 kHz SCL), targeting ultra-low-power remote sensing and battery-powered data acquisition.
For engineers reviewing the MCP3221A3T-E/OT datasheet, MCP3221A3T-E/OT pinout, MCP3221A3T-E/OT application, or MCP3221A3T-E/OT equivalent, key selection criteria include its guaranteed ±1 LSB DNL / ±2 LSB INL linearity over –40°C to +125°C, SOT-23-5 package footprint, I²C addressability for multi-device bus configurations, and verified performance at both Standard (100 kHz) and Fast (400 kHz) I²C modes.
Technical Context
The MCP3221A3T-E/OT implements a classic SAR architecture with an integrated sample-and-hold capacitor and self-timed internal oscillator-decoupling conversion timing from I²C clock frequency. Its straight-binary output format and fixed 12-bit resolution are synchronized to the master's I²C protocol without requiring external timing components.
It functions exclusively as an I²C slave device with a hardwired 7-bit address (1001101b) and R/W bit–controlled read-only operation: setting R/W = 1 initiates conversion and enables data readback; R/W = 0 triggers ACK-only polling. No registers or configuration bits exist-operation is fully stateless and deterministic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale input range |
| INL / DNL | ±2 LSB max / ±1 LSB max - ensures monotonicity and <0.05% end-point linearity error |
| Conversion Rate | 22.3 ksps in I²C Fast Mode - supports real-time sampling of signals up to ~11 kHz Nyquist bandwidth |
| Supply Range | 2.7V to 5.5V - compatible with Li-ion, 3.3V, and 5V logic domains without level-shifting |
| Standby Current | ≤1 µA - enables years of operation on coin-cell batteries in sleep-wake sensor nodes |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial control, and outdoor monitoring |
| I²C Modes | Standard (100 kHz) and Fast (400 kHz) - supports flexible system timing and noise immunity trade-offs |
Pinout & Package
Package: 5-pin SOT-23, 1.6 mm × 2.8 mm footprint, surface-mount, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply | Provides operating voltage (2.7–5.5V) and serves as analog reference for conversion |
| VSS | Ground reference | Common return path for analog and digital circuitry; must be low-impedance for noise rejection |
| AIN | Analog input | Single-ended input accepting 0 V to VDD; requires external RC filtering per layout guidelines |
| SDA | I²C bidirectional data line | Open-drain output; requires external pull-up (2 kΩ for 400 kHz); transmits 12-bit result MSB-first |
| SCL | I²C clock input | Open-drain input; master-generated clock synchronizing all data transfers and conversion triggers |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-and-hold | Eliminates need for external hold capacitor and driver op-amp, reducing BOM count and board area |
| Self-timed conversion clock | Removes dependency on I²C clock stability; tCONV = 8.96 µs and tACQ = 1.12 µs are internally fixed |
| Multi-device I²C bus support | Up to eight MCP3221A3T-E/OT devices share one 2-wire bus via unique A2/A1/A0 address bits |
| No missing codes | Guaranteed monotonic transfer function across full temperature and supply range |
| Low-leakage analog input | ±1 µA max input leakage - preserves signal integrity in high-impedance sensor interfaces |
Applications
| Data Logging | Handheld Portable Applications |
|---|---|
Use Scenario: Periodic voltage measurement from thermistors, RTDs, or potentiometers in field-deployed environmental monitors. IC Role / Device Role / Timing Role: Single-ended ADC capturing analog sensor outputs and streaming digitized values over I²C to MCU for storage or transmission. Use Value: 12-bit resolution and ±2 LSB INL enable sub-0.1°C temperature accuracy; 1 µA standby current extends battery life to >5 years in 1-sample/hour duty cycle. |
Use Scenario: Real-time battery voltage and current monitoring in portable test meters and handheld multimeters. IC Role / Device Role / Timing Role: Low-power ADC interfacing directly to battery terminals and shunt resistors, triggered by host MCU via I²C. Use Value: 22.3 ksps sampling supports fast transient capture; SOT-23-5 footprint minimizes PCB space in compact enclosures. |
| Multi-Zone Monitoring | Remote or Isolated Data Acquisition |
Use Scenario: Simultaneous analog readings from multiple sensors (e.g., pressure, humidity, voltage) distributed across HVAC ducts or industrial machinery. IC Role / Device Role / Timing Role: One of up to eight identical MCP3221A3T-E/OT units on shared I²C bus, each assigned unique address for zone-specific data collection. Use Value: Addressable architecture eliminates multiplexer complexity and channel crosstalk; extended temperature rating ensures reliability near heat sources. |
Use Scenario: Analog signal digitization in electrically noisy or galvanically isolated environments (e.g., motor drives, solar inverters, PLC analog inputs). IC Role / Device Role / Timing Role: ADC placed on isolated side of digital isolator, receiving sensor signals and transmitting clean 12-bit codes across barrier via I²C. Use Value: Minimal active current (250 µA) reduces isolated-side power dissipation; no external clock simplifies isolated timing design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822UIDBVR | 12-bit, SPI interface, 200 kSPS, 2.7–5.25V, 1.25 mW typical power | Requires SPI host and separate CS/control lines; higher speed but no native I²C bus sharing | Select when higher throughput or existing SPI infrastructure exists; not drop-in for I²C bus topology. |
| MCP3021A3T-E/OT | 10-bit resolution, same SOT-23-5 package, identical I²C interface and timing, 1 µA standby | Lower resolution (1024 codes vs. 4096) limits dynamic range and small-signal sensitivity | Select when 10-bit precision suffices and cost reduction is prioritized; pin-compatible with identical layout. |
Compared with ADS7822UIDBVR and MCP3021A3T-E/OT, the MCP3221A3T-E/OT uniquely balances I²C bus scalability, 12-bit fidelity, and sub-1 µA quiescent current-making it optimal for space-constrained, multi-node, battery-operated systems where resolution and bus efficiency are critical.
Availability
MCP3221A3T-E/OT is available at Aetrix Electronics and suitable for data logging, handheld portable instrumentation, and remote sensor node applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MCP3221A3T-E/OT 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 automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.
The MCP3221 series is part of Microchip's precision analog portfolio, designed specifically for low-power, high-accuracy sensor interfacing in resource-constrained embedded systems where minimal external components and robust I²C integration are essential.
FAQ
What is the I²C address of the MCP3221A3T-E/OT?
The MCP3221A3T-E/OT has a fixed 7-bit I²C slave address of 1001101b (0x4D). The R/W bit (bit 0) determines operation: setting it to 1 initiates conversion and enables readback of the 12-bit result; setting it to 0 performs polling with ACK only. No address pins are user-configurable on this variant.
Does the MCP3221A3T-E/OT require an external reference voltage?
No. The MCP3221A3T-E/OT uses VDD as its analog reference-its full-scale range is 0 V to VDD. This eliminates the need for an external voltage reference, simplifying design and reducing cost. Accuracy specifications (INL/DNL) are guaranteed over the 2.7V–5.5V supply range.
How many MCP3221A3T-E/OT devices can share one I²C bus?
Up to eight MCP3221A3T-E/OT devices can operate on a single 2-wire I²C bus. Each unit uses the same base address (1001101b), but Microchip offers factory-programmed variants with different A2/A1/A0 bits. The MCP3221A3T-E/OT itself uses the default 101 code, so multiple units require ordering distinct part numbers (e.g., MCP3221A0T-E/OT, MCP3221A1T-E/OT) for unique addressing.
What is the conversion time and sample rate of the MCP3221A3T-E/OT?
The MCP3221A3T-E/OT has a fixed conversion time of 8.96 µs and analog acquisition time of 1.12 µs, both governed by its internal oscillator. In continuous-conversion mode with I²C Fast Mode (400 kHz SCL), it achieves a maximum sample rate of 22.3 ksps. Sample rate drops to ~5.6 ksps in Standard Mode (100 kHz SCL) due to longer bus transaction overhead.
Is the MCP3221A3T-E/OT suitable for automotive applications?
Yes. The MCP3221A3T-E/OT is specified for operation from –40°C to +125°C and qualified to AEC-Q200 stress test standards for passive components. Its 12-bit linearity, low power consumption, and SOT-23-5 package make it suitable for cabin temperature sensing, battery monitoring, and non-safety-critical subsystems in automotive ECUs.
MCP3221A3T-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 22.3k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- I2C
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- SOT-23-5
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3221A3T-E/OT FAQ
1.How can I place an order for MCP3221A3T-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3221A3T-E/OT 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 MCP3221A3T-E/OT reliable?
The price and inventory of MCP3221A3T-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3221A3T-E/OT is usually 5 days.
3.What payment methods are accepted for MCP3221A3T-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3221A3T-E/OT transactions.
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4.How is shipping managed for MCP3221A3T-E/OT?
MCP3221A3T-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3221A3T-E/OT 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 MCP3221A3T-E/OT?
For technical support, including MCP3221A3T-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3221A3T-E/OT requirements.
6.How does Aetrix verify that MCP3221A3T-E/OT is sourced from the original manufacturer or authorized distributors?
All MCP3221A3T-E/OT 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 MCP3221A3T-E/OT meets industry standards.
7.What is the process for return or replacement of MCP3221A3T-E/OT?
All MCP3221A3T-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP3221A3T-E/OT, 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 MCP3221A3T-E/OT part is unused and in its original packaging.
Return procedure for MCP3221A3T-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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