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Microchip Technology MCP3221A2T-E/OT
- Part No.:
- MCP3221A2T-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP3221A2T-E/OT.pdf
- Description:
- IC ADC 12BIT SAR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,405
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Product details
Overview
MCP3221A2T-E/OT from Microchip Technology is a 12-bit successive approximation ADC with single-ended analog input, I²C-compatible 2-wire serial interface, ±1 LSB DNL and ±2 LSB INL, operating from 2.7V to 5.5V supply, and specified for -40°C to +125°C extended temperature range - used in battery-powered remote data acquisition systems requiring low-power precision sensing.
For engineers reviewing the MCP3221A2T-E/OT datasheet, MCP3221A2T-E/OT pinout, MCP3221A2T-E/OT application, or MCP3221A2T-E/OT equivalent, key selection criteria include I²C Fast Mode (400 kHz) sample rate of 22.3 ksps, 250 µA max conversion current, 5 nA typical standby current, SOT-23-5 package footprint, and single-supply operation across industrial voltage rails.
Technical Context
The MCP3221A2T-E/OT implements a classic SAR architecture with on-chip sample-and-hold and internal conversion clock, decoupling timing from I²C bus speed. Its straight-binary output format and fixed 12-bit resolution are synchronized to the falling edge of the R/W bit in the I²C address byte.
It operates as an I²C slave device with hardwired 7-bit address 1001101 (A2=1, A1=0, A0=1), supporting up to eight devices on one bus. No internal registers or configuration bits exist - every read initiates a new conversion and returns the latest 12-bit result across two bytes (MSB first).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range, enabling sub-millivolt resolution at 5 V reference. |
| INL / DNL | ±2 LSB / ±1 LSB max - ensures monotonicity and <0.05% end-point linearity error across temperature and supply voltage. |
| Sample Rate | 22.3 ksps in I²C Fast Mode - supports real-time monitoring of signals up to ~11 kHz (Nyquist-limited) without external timing control. |
| Supply Range | 2.7 V to 5.5 V - interoperable with 3.3 V and 5 V microcontrollers and compatible with Li-ion, coin-cell, and regulated industrial rails. |
| Quiescent Current | 5 nA typical standby current - enables multi-year operation in energy-harvesting or wake-on-event sensor nodes. |
| Interface | I²C Standard (100 kHz) and Fast (400 kHz) modes - requires no additional level-shifting or protocol translation in mixed-voltage systems. |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor environmental monitoring. |
Pinout & Package
Package: 5-pin SOT-23, 1.6 mm × 2.8 mm × 1.1 mm body, gull-wing leads, JEDEC MO-178AA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply | Provides both operating power and analog reference; must be bypassed with ≥0.1 µF ceramic capacitor near pin. |
| VSS | Ground reference | Analog and digital common return; requires low-impedance connection to system ground plane to minimize noise coupling. |
| AIN | Analog input | Single-ended input accepting 0 V to VDD range; high-impedance (>10 GΩ) with ≤1 pA leakage - suitable for direct connection to resistive sensors or op-amp buffers. |
| SDA | I²C bidirectional data | Open-drain output requiring external pull-up (2 kΩ for 400 kHz); shares bus with other I²C slaves; supports ACK/NACK handshaking. |
| SCL | I²C clock input | Open-drain input requiring same pull-up as SDA; clock edges synchronize all data transfers; master-controlled timing source. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-and-hold | Eliminates need for external hold capacitor or driver amplifier; acquisition time fixed at 1.12 µs independent of bus speed. |
| Self-timed conversion | Internal oscillator drives 8.96 µs conversion time - no external clock required and immune to I²C jitter or stretch conditions. |
| I²C address flexibility | Three hardware address bits (A2/A1/A0) enable up to eight identical MCP3221A2T-E/OT devices on one bus without software remapping. |
| Low-noise analog core | 72 dB SINAD and 86 dB SFDR at 1 kHz input - sufficient for 11.7-bit effective resolution in clean signal chains. |
| Robust I/O protection | ≥4 kV HBM ESD rating on all pins and rail-to-rail input tolerance (VSS–0.3 V to VDD+0.3 V) - withstands board handling and transient coupling. |
Applications
| Data Logging | Handheld Portable Applications |
|---|---|
|
Use Scenario: Autonomous environmental sensor node recording temperature, humidity, and light levels every 10 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring single-ended sensor outputs; initiates conversion on each I²C read request. Use Value: 5 nA standby current extends battery life beyond 5 years; 22.3 ksps capability allows oversampling for noise reduction without firmware overhead. |
Use Scenario: Pocket-sized multimeter measuring DC voltage, resistance, and continuity with auto-ranging and backlit LCD. IC Role / Device Role / Timing Role: Precision measurement ADC interfacing directly to front-end attenuators and op-amp gain stages. Use Value: ±1 LSB DNL ensures accurate code transitions during autoranging; SOT-23-5 footprint minimizes PCB area in space-constrained handheld enclosure. |
| Battery-Powered Test Equipment | Remote or Isolated Data Acquisition |
|
Use Scenario: Field-deployable vibration analyzer capturing accelerometer waveforms via Bluetooth LE to smartphone app. IC Role / Device Role / Timing Role: High-speed sampling ADC triggered by MCU timer; outputs raw 12-bit samples over I²C for real-time FFT processing. Use Value: 22.3 ksps continuous mode meets Nyquist requirement for 10 kHz mechanical resonance detection; 250 µA conversion current enables burst-mode operation. |
Use Scenario: Wireless pressure transducer mounted on oil pipeline, transmitting readings every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Low-power analog digitizer connected to bridge sensor; wakes only during scheduled measurement windows. Use Value: 1 µA maximum standby current prevents parasitic drain during 99.9% sleep time; extended -40°C to +125°C rating ensures reliability in unheated enclosures. |
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 |
|---|---|---|---|
| ADS7822UID | 12-bit, SPI interface, 200 kSPS, 2.7–5.25 V, 1.25 mW typical power | Requires SPI host and separate CS control; higher speed but no I²C bus sharing | Choose when existing design uses SPI peripherals and needs >22 ksps throughput. |
| MCP3021A2T-E/OT | 10-bit resolution, same SOT-23-5 package, identical I²C address and timing, 150 µA max conversion current | Lower resolution and reduced dynamic range (60 dB SINAD vs. 72 dB); lower cost per unit | Choose when 10-bit accuracy suffices and BOM cost optimization is prioritized over precision. |
Compared with ADS7822UID and MCP3021A2T-E/OT, the MCP3221A2T-E/OT uniquely balances I²C bus scalability, ultra-low standby current, and 12-bit linearity in the smallest possible footprint - making it optimal for distributed, battery-limited sensor networks where bus efficiency and longevity outweigh raw speed or lowest unit cost.
Availability
MCP3221A2T-E/OT is available at Aetrix Electronics and suitable for data logging, handheld portable instrumentation, and remote industrial monitoring requiring stable component supply across automotive, energy, and IoT production programs.
Supply support for MCP3221A2T-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP3221A2T-E/OT belongs to Microchip's precision analog product line, designed specifically for low-power, high-accuracy sensor interfacing in space- and energy-constrained embedded systems.
FAQ
What is the I²C address of the MCP3221A2T-E/OT?
The MCP3221A2T-E/OT has a fixed 7-bit I²C slave address of 0x4D (1001101 binary), determined by device code 1001 and address bits A2=1, A1=0, A0=1. The R/W bit (bit 0) is set to '1' for read operations, resulting in an 8-bit address byte of 0x9A. No write operations are supported - all reads trigger a new conversion.
Does the MCP3221A2T-E/OT require external reference voltage?
No. The MCP3221A2T-E/OT uses VDD as its sole reference voltage - the full-scale range is 0 V to VDD. This eliminates need for external voltage references or precision dividers, simplifying layout and reducing BOM count. Input linearity and INL are specified relative to VDD across 2.7–5.5 V.
How does the MCP3221A2T-E/OT handle multiple devices on the same I²C bus?
The MCP3221A2T-E/OT supports up to eight units on one I²C bus via three hardware address pins (A2, A1, A0) tied to VDD or VSS. The MCP3221A2T-E/OT variant fixes these to A2=1, A1=0, A0=1, yielding address 0x4D. Other variants (e.g., MCP3221A0T-E/OT) offer different combinations for system-level addressing flexibility.
What is the conversion latency from I²C command to valid data for the MCP3221A2T-E/OT?
After the master sends the Start condition and address byte (with R/W = 1), conversion begins on the falling edge of the R/W bit. Total latency is tACQ + tCONV = 1.12 µs + 8.96 µs = 10.08 µs typical. Data is ready before the first clock pulse of the read sequence - the master may immediately clock out MSB without delay.
Can the MCP3221A2T-E/OT operate from a 3.3 V supply while maintaining full 12-bit performance?
Yes. The MCP3221A2T-E/OT is fully specified from 2.7 V to 5.5 V, including all AC and DC parameters. At 3.3 V, LSB size is 0.8 mV (3.3 V / 4096), INL remains ±2 LSB max, and 22.3 ksps sample rate is maintained in I²C Fast Mode - verified across -40°C to +125°C.
MCP3221A2T-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:
- -
MCP3221A2T-E/OT FAQ
1.How can I place an order for MCP3221A2T-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3221A2T-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 MCP3221A2T-E/OT reliable?
The price and inventory of MCP3221A2T-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 MCP3221A2T-E/OT is usually 5 days.
3.What payment methods are accepted for MCP3221A2T-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3221A2T-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3221A2T-E/OT?
MCP3221A2T-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3221A2T-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 MCP3221A2T-E/OT?
For technical support, including MCP3221A2T-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3221A2T-E/OT requirements.
6.How does Aetrix verify that MCP3221A2T-E/OT is sourced from the original manufacturer or authorized distributors?
All MCP3221A2T-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 MCP3221A2T-E/OT meets industry standards.
7.What is the process for return or replacement of MCP3221A2T-E/OT?
All MCP3221A2T-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP3221A2T-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 MCP3221A2T-E/OT part is unused and in its original packaging.
Return procedure for MCP3221A2T-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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