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Microchip Technology AT24C32W-10SI-2.5
- Part No.:
- AT24C32W-10SI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C32W-10SI-2.5.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,424
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Product details
Overview
AT24C32W-10SI-2.5 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM optimized for low-voltage industrial applications. It operates from 2.5V to 5.5V, supports 100 kHz I²C bus speed, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in embedded systems for parameter storage, calibration data logging, and configuration backup.
For engineers reviewing the AT24C32W-10SI-2.5 datasheet, AT24C32W-10SI-2.5 pinout, AT24C32W-10SI-2.5 application, or AT24C32W-10SI-2.5 equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), 2.5V minimum supply compatibility, 32-byte page write capability, Schmitt-triggered noise-immune inputs, and hardware-based upper-quadrant memory write protection.
Technical Context
The AT24C32W-10SI-2.5 implements a standard two-wire I²C interface with open-drain SDA and input-only SCL pins, supporting bidirectional data transfer under master-controlled clocking. Its internal address counter enables current-address, random-address, and sequential read modes, while device addressing uses A0–A2 pins to allow up to eight devices on one bus.
Write operations are internally self-timed with a maximum 10 ms cycle time; page writes support up to 32 bytes per transaction with automatic address increment within the same page boundary. The WP pin provides hardware-level inhibition of writes to the upper 8K bits when pulled high, and Schmitt-triggered inputs with 100 ns noise suppression ensure robust operation in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32,768 bits (4096 × 8 words) - sufficient for firmware configuration, sensor calibration tables, and device identity storage in space-constrained designs. |
| Supply Voltage Range | 2.5V to 5.5V - enables direct integration with 2.5V, 3.3V, and 5V microcontroller I/O domains without level shifting. |
| I²C Bus Speed | 100 kHz - compatible with legacy and low-power microcontrollers; supports reliable communication over longer traces or noisy PCBs. |
| Write Cycle Time | Max 10 ms - defines minimum interval between write commands; impacts real-time logging latency and firmware update sequencing. |
| Endurance | 1 million write cycles - ensures long-term reliability in applications requiring frequent parameter updates (e.g., energy meter tariff logs). |
| Data Retention | 100 years at +25°C - guarantees nonvolatile storage integrity across product lifetime without refresh or backup power. |
| Operating Temperature | –40°C to +85°C - certified for industrial-grade deployment in factory automation, motor drives, and outdoor metering equipment. |
| Standby Current | 0.5 µA at 2.5V - minimizes quiescent power draw in battery-backed or always-on IoT edge nodes. |
Pinout & Package
AT24C32W-10SI-2.5 is supplied in an 8-pin JEDEC SOIC package (8S1), 0.150" wide, with standard gull-wing leads and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardware-selectable I²C slave address bits; enable up to eight AT24C32W-10SI-2.5 devices on a shared bus without software arbitration. |
| SDA | Serial Data I/O | Open-drain bidirectional line for I²C data exchange; requires external pull-up resistor and supports wire-OR connection with other I²C peripherals. |
| SCL | Serial Clock Input | Master-generated clock signal that synchronizes all data transfers; not driven by the EEPROM. |
| WP | Write Protect Control | Active-high hardware lock: when tied to VCC, prevents writes to upper 8K bits (addresses 0x2000–0x3FFF), safeguarding critical firmware parameters. |
| VCC | Power Supply | Primary supply input (2.5V–5.5V); powers internal logic and memory array; decoupling capacitor required near pin. |
| GND | Ground Reference | System ground return path; must be low-impedance and co-located with VCC decoupling for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write mode | Enables efficient bulk writes without repeated start/stop overhead; reduces I²C transaction count by up to 32× versus byte-wise programming. |
| Schmitt-triggered SDA/SCL inputs | Provides 100 ns noise filtering and hysteresis, eliminating false triggering from EMI or signal ringing in industrial environments. |
| Hardware write protection (WP) | Physically isolates upper memory quadrant from accidental overwrite-critical for bootloader or security key storage. |
| 100-year data retention | Eliminates need for periodic refresh or backup power; validated for use in sealed, maintenance-free equipment like smart utility meters. |
| Industrial temperature grade | Qualified from –40°C to +85°C per JEDEC JESD22-A108; supports deployment in uncontrolled ambient conditions without derating. |
Applications
| Industrial Sensor Calibration | Smart Energy Metering |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during system boot and runtime recalibration sequences. Use Value: Enables field-replaceable sensor modules with unique calibration data preserved across power cycles and firmware updates. | Use Scenario: Recording tariff schedules, billing intervals, and tamper-event timestamps in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Secure, low-power parameter store synchronized with metrology IC interrupts and RTC updates. Use Value: Guarantees regulatory-compliant data persistence for 10+ years without battery backup or supercapacitor support. |
| Embedded HMI Configuration | Motor Drive Parameter Storage |
Use Scenario: Saving user-defined display themes, language settings, and alarm thresholds in industrial HMIs with touch interfaces. IC Role / Device Role / Timing Role: I²C-configurable memory mapped into MCU's peripheral address space for fast read/write access. Use Value: Allows full UI personalization without reprogramming flash; survives firmware upgrades and factory resets. | Use Scenario: Holding motor-specific tuning parameters (PID gains, current limits, commutation angles) in variable-frequency drives. IC Role / Device Role / Timing Role: Persistent storage accessed during drive initialization and dynamic parameter adjustment via Modbus RTU. Use Value: Supports plug-and-play motor replacement with auto-load of optimal control profiles, reducing commissioning time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-SSHM-T | Same 32K-bit capacity, 2.5V–5.5V operation, and industrial temp range; uses newer SOIC-8 (JEDEC MS-012) package with tighter lead pitch (0.025" vs 0.050"). | Requires PCB layout revision due to smaller footprint and finer pitch; no change in firmware or I²C timing. | Select when new designs prioritize component density and modern assembly processes; not drop-in for AT24C32W-10SI-2.5. |
| BR24G32FJ-3GE2 | 32K-bit I²C EEPROM with 1.7V–5.5V range, 1 MHz max speed, and built-in error correction (ECC); packaged in 8-pin TSSOP (same width as SOIC but thinner profile). | Supports faster writes and higher noise immunity via ECC; TSSOP may require reflow profile adjustment versus SOIC. | Choose for next-gen designs needing enhanced data integrity or extended low-voltage operation below 2.5V. |
Compared with AT24C32W-10SI-2.5, AT24C32D-SSHM-T offers identical electrical behavior in a denser package, while BR24G32FJ-3GE2 adds ECC and wider voltage range at the cost of different timing and physical fit-neither is pin-compatible without board modification.
Availability
AT24C32W-10SI-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, embedded HMI configuration, and motor drive parameter storage requiring stable component supply across multi-year production cycles.
Supply support for AT24C32W-10SI-2.5 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 acquired Atmel in 2016 and maintains full backward compatibility and long-term support for the AT24Cxx EEPROM family.
The AT24C32W-10SI-2.5 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power industrial systems requiring guaranteed data integrity and extended temperature operation without external support circuitry.
FAQ
What is the maximum I²C clock frequency supported by AT24C32W-10SI-2.5?
The AT24C32W-10SI-2.5 supports a maximum I²C clock frequency of 100 kHz when operating at 2.5V, 2.7V, or 1.8V supply levels. This is specified in the AC Characteristics table under fSCL for low-voltage variants. It does not support 400 kHz operation-only the 5.0V-rated versions (e.g., AT24C32-10SC) do. The 100 kHz limit ensures reliable timing margins under worst-case voltage and temperature conditions.
Does AT24C32W-10SI-2.5 require external pull-up resistors on SDA and SCL lines?
Yes, AT24C32W-10SI-2.5 requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a passive input. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The device itself contains no internal pull-ups, and omission will prevent I²C communication. Pull-up voltage must match the host controller's I/O voltage domain.
How does the Write Protect (WP) pin function on AT24C32W-10SI-2.5?
On AT24C32W-10SI-2.5, the WP pin is active-high: when tied to VCC, it inhibits write operations to the upper quadrant (8K bits, addresses 0x2000–0x3FFF); when grounded or left floating (internally pulled down), full memory is writable. This hardware lock operates independently of I²C commands and cannot be overridden in software-ensuring protection even during firmware faults or unauthorized access attempts.
Can AT24C32W-10SI-2.5 be used in a system powered by 1.8V?
No, AT24C32W-10SI-2.5 is rated for 2.5V to 5.5V operation only. While the AT24C32 family includes a -1.8 variant (e.g., AT24C32W-10SI-1.8), the -2.5 suffix explicitly denotes the 2.5V minimum supply version. Operating AT24C32W-10SI-2.5 below 2.5V risks data corruption, failed writes, or noncompliant I²C signaling-verified by DC characteristics tables showing VCC2 min = 2.5V.
What is the meaning of "-10SI" in AT24C32W-10SI-2.5?
The "-10SI" suffix in AT24C32W-10SI-2.5 indicates: "10" = maximum 10 ms write cycle time; "S" = SOIC package (8-pin JEDEC); "I" = industrial temperature grade (–40°C to +85°C). The "W" denotes wafer-sort tested and qualified for industrial use, and "-2.5" specifies the 2.5V–5.5V supply voltage range. All elements are defined in the official Atmel/Microchip ordering information tables.
AT24C32W-10SI-2.5 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C32W-10SI-2.5 FAQ
1.How can I place an order for AT24C32W-10SI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32W-10SI-2.5 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-2.5 reliable?
The price and inventory of AT24C32W-10SI-2.5 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-2.5 is usually 5 days.
3.What payment methods are accepted for AT24C32W-10SI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32W-10SI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32W-10SI-2.5?
AT24C32W-10SI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32W-10SI-2.5 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-2.5?
For technical support, including AT24C32W-10SI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32W-10SI-2.5 requirements.
6.How does Aetrix verify that AT24C32W-10SI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT24C32W-10SI-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of AT24C32W-10SI-2.5?
All AT24C32W-10SI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32W-10SI-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for AT24C32W-10SI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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