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Microchip Technology AT24C32W-10SI
- Part No.:
- AT24C32W-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C32W-10SI.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
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Product details
Overview
AT24C32W-10SI from Microchip Technology (formerly Atmel) is a 32 Kbit I²C-compatible serial EEPROM organized as 4096 × 8 bits, operating from 2.7V to 5.5V, featuring hardware write protection via WP pin, 32-byte page write mode, and 10 ms max self-timed write cycle. It serves as nonvolatile configuration storage in industrial sensor nodes and embedded control modules requiring reliable data retention across temperature extremes.
For engineers reviewing the AT24C32W-10SI datasheet, AT24C32W-10SI pinout, AT24C32W-10SI application, or AT24C32W-10SI equivalent, key selection considerations include its industrial-grade (-40°C to +85°C) operation, 100 kHz I²C speed at 2.7V, 2 µA standby current, and 8-pin SOIC (8S1) package compatibility with legacy board layouts.
Technical Context
The AT24C32W-10SI implements a two-wire I²C interface with Schmitt-trigger inputs and noise filtering for robust communication in electrically noisy environments. Its device addressing uses A0–A2 pins to support up to eight devices on a shared bus, with internal pull-down biasing when unconnected.
It supports byte and page write operations, with automatic address incrementing within pages and wraparound at page boundaries. Acknowledge polling enables host firmware to detect write completion without fixed delays, improving system responsiveness during memory updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8), enabling storage of firmware calibration tables or device configuration parameters in compact embedded systems |
| Supply Voltage Range | 2.7V to 5.5V - supports direct interfacing with 3.3V microcontrollers and backward compatibility with 5V legacy designs |
| I²C Clock Frequency | 100 kHz at 2.7V - ensures timing compliance in low-voltage industrial applications without external level-shifting |
| Write Cycle Time | 10 ms max - defines minimum interval between successive write commands; impacts real-time logging latency |
| Endurance | 1 million write cycles - guarantees long-term reliability for frequently updated settings such as metering counters or event logs |
| Data Retention | 100 years at +25°C - ensures persistent storage integrity over product lifetime without battery backup |
| Standby Current | 2 µA at 5.5V - minimizes quiescent power draw in always-on IoT edge nodes and battery-powered sensors |
Pinout & Package
AT24C32W-10SI is housed in an 8-pin JEDEC SOIC package (package code 8S1), measuring 3.90 mm × 4.90 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch. This surface-mount package supports automated assembly and provides thermal and mechanical stability for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Configure slave address (0x50–0x57); floating = logic low, enabling multi-device bus topology without external pull-ups |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; shares bus with other I²C peripherals |
| SCL | Serial Clock Input | Master-generated clock; synchronizes all data transfers; Schmitt-trigger input rejects EMI-induced glitches |
| WP | Write Protect Control | Hardware lock: tied to VCC disables writes to upper quadrant (8K bits); tied to GND enables full memory access |
| VCC | Power Supply | Primary supply rail (2.7–5.5V); powers internal logic and EEPROM array; decoupling capacitor required |
| GND | Ground Reference | Signal and power return path; must be low-impedance connection to minimize noise coupling into SDA/SCL |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | Functional down to 2.7V supply - eliminates need for voltage regulators in 3.3V systems and extends battery life |
| Page Write Mode | 32-byte burst writes reduce I²C transaction overhead by >75% vs. byte-by-byte programming |
| Noise Immunity | Schmitt-trigger inputs + 100 ns noise suppression filter - prevents spurious start/stop detection in motor-drive or power-conversion environments |
| Hardware Write Protection | WP pin directly gates write enable logic - provides tamper-resistant configuration locking independent of firmware state |
| Industrial Temperature Range | -40°C to +85°C operation - validated for deployment in factory automation controllers and outdoor telemetry units |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and linearization tables in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed during power-up initialization and field recalibration sequences. Use Value: Enables traceable, field-updatable calibration without requiring reprogramming tools or soldering - reducing service downtime and NIST compliance overhead. |
Use Scenario: Holding tariff schedules, billing registers, and communication protocol settings in electricity/water meters deployed in utility substations. IC Role / Device Role / Timing Role: Secure, long-life configuration memory that survives brownouts and maintains regulatory audit trails across 15+ year deployments. Use Value: Guarantees 100-year data retention and 1M write endurance - meeting ANSI C12.22 and DLMS/COSEM certification requirements for revenue-grade metering. |
| PLC I/O Module Parameterization | Medical Device Setup Profiles |
|
Use Scenario: Saving channel-specific scaling factors, alarm thresholds, and sampling rates in modular programmable logic controller I/O cards. IC Role / Device Role / Timing Role: Persistent configuration store read at boot to configure analog input gain stages and digital output drive strength. Use Value: Eliminates manual DIP-switch configuration; allows remote firmware updates to modify operational parameters without hardware changes. |
Use Scenario: Storing user-selectable therapy modes, safety limits, and calibration history in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: FDA-compliant nonvolatile memory for critical setup data, accessed only during safe boot or maintenance mode. Use Value: WP pin hardware lock prevents accidental overwrite during clinical use - satisfying IEC 62304 software safety classification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-WMN6TP | 32 Kbit SPI interface, 5 MHz max clock, 5 ms write cycle, 8-pin SOIC (same footprint) | Requires SPI-capable MCU; incompatible with I²C-only hosts; faster write but higher pin count for CS signal | Select when migrating from I²C to SPI architecture or when higher throughput justifies interface redesign |
| 24LC32A-I/P | 32 Kbit I²C EEPROM, 100 kHz @ 2.5V, 10 ms write, PDIP-8 package (not SOIC) | Same electrical specs but through-hole packaging - unsuitable for SMT production or space-constrained boards | Choose only for prototyping or legacy repair where PDIP socket compatibility is mandatory |
Compared with AT24C32W-10SI, M95320-WMN6TP offers faster serial throughput but demands SPI hardware support, while 24LC32A-I/P matches functionality but lacks surface-mount compatibility - making AT24C32W-10SI optimal for new industrial SMT designs needing I²C integration and industrial temperature resilience.
Availability
AT24C32W-10SI is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and PLC I/O module parameterization requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT24C32W-10SI 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 is a global semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions, with a focus on industrial, automotive, and communications markets.
The AT24C32W-10SI belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring robust, pin-compatible nonvolatile storage in harsh operating environments.
FAQ
What is the operating temperature range of the AT24C32W-10SI?
The AT24C32W-10SI is rated for industrial operation from -40°C to +85°C. This range is verified per the manufacturer's datasheet and applies to all electrical specifications including I²C timing, write endurance, and data retention. The "I" suffix in the part number explicitly denotes industrial temperature qualification, distinguishing it from commercial-grade variants.
Does the AT24C32W-10SI support 1.8V operation?
No, the AT24C32W-10SI does not support 1.8V operation. Its specified supply range is 2.7V to 5.5V, as indicated by the "-2.7" option suffix in the ordering code. For 1.8V compatibility, Microchip offers the AT24C32W-10SI-1.8 variant, which has different DC characteristics and AC timing limits.
What package type is used for the AT24C32W-10SI?
The AT24C32W-10SI uses an 8-pin JEDEC SOIC package (package code 8S1), with 1.27 mm lead pitch and dimensions of 3.90 mm × 4.90 mm × 1.75 mm. This surface-mount package is compatible with standard reflow profiles and automated pick-and-place equipment used in high-volume industrial PCB assembly.
How many devices can share the same I²C bus with the AT24C32W-10SI?
Up to eight AT24C32W-10SI devices can share a single I²C bus using the A0, A1, and A2 address pins. Each combination of hardwired or floating address pins yields a unique 7-bit slave address (0x50–0x57). All devices respond only to their configured address, enabling scalable memory expansion without bus arbitration logic.
What is the purpose of the WP pin on the AT24C32W-10SI?
The WP (Write Protect) pin on the AT24C32W-10SI provides hardware-level write inhibition for the upper quadrant (8K bits) of memory. When pulled high to VCC, writes to addresses 0x2000–0x3FFF are blocked; when grounded, full memory access is enabled. This feature safeguards critical calibration or security data from accidental firmware overwrites.
AT24C32W-10SI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C32W-10SI FAQ
1.How can I place an order for AT24C32W-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32W-10SI 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 AT24C32W-10SI reliable?
The price and inventory of AT24C32W-10SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32W-10SI is usually 5 days.
3.What payment methods are accepted for AT24C32W-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32W-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32W-10SI?
AT24C32W-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32W-10SI 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 AT24C32W-10SI?
For technical support, including AT24C32W-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32W-10SI requirements.
6.How does Aetrix verify that AT24C32W-10SI is sourced from the original manufacturer or authorized distributors?
All AT24C32W-10SI 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 AT24C32W-10SI meets industry standards.
7.What is the process for return or replacement of AT24C32W-10SI?
All AT24C32W-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32W-10SI, 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 AT24C32W-10SI part is unused and in its original packaging.
Return procedure for AT24C32W-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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