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Microchip Technology 24LC32AF-I/MS
- Part No.:
- 24LC32AF-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24LC32AF-I/MS.pdf
- Description:
- IC EEPROM 32KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,584
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Product details
Overview
24LC32AF-I/MS from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (−40°C to +85°C), 400 μA max read current, 1 μA max standby current, and hardware write-protect for upper 1/4 array (C00h–FFFh). It supports page writes up to 32 bytes and is commonly used in embedded system configuration storage and sensor calibration data retention.
For engineers reviewing the 24LC32AF-I/MS datasheet, 24LC32AF-I/MS pinout, 24LC32AF-I/MS application, or 24LC32AF-I/MS equivalent, key selection considerations include VCC min (2.5V), I²C clock compatibility (100/400 kHz), MSOP-8 package dimensions, quarter-array hardware write-protection, and endurance (>1M cycles).
Technical Context
The 24LC32AF-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 32-byte page write buffer, address pointer auto-increment logic, and dedicated hardware write-protect circuitry tied to the WP pin.
It uses on-chip charge-pump voltage generation for EEPROM programming, enabling self-timed erase/write cycles without external high-voltage supply. Device addressing supports up to eight units on one bus via A0–A2 pins, with slave address prefix '1010' and R/W bit control - all validated for industrial-grade operation across 2.5V–5.5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware parameters or calibration tables in space-constrained designs |
| VCC Range | 2.5V to 5.5V - requires ≥2.5V supply; not functional below 2.5V unlike 24AA32AF variant |
| I²C Clock Speed | Up to 400 kHz at VCC ≥2.5V; drops to 100 kHz if VCC <2.5V - constrains maximum bus throughput in low-voltage systems |
| Page Write Buffer | 32-byte buffer - allows efficient bulk writes without host intervention per byte, reducing I²C transaction overhead |
| Write Protection | Hardware-based protection of upper 8Kbit (C00h–FFFh) when WP = VCC - prevents accidental overwrites of critical configuration data |
| Endurance & Retention | >1,000,000 erase/write cycles and >200 years data retention - suitable for long-life industrial deployments |
| Operating Temp | Industrial grade: −40°C to +85°C - qualified for use in automotive body electronics and industrial controllers |
Pinout & Package
24LC32AF-I/MS is supplied in an 8-lead MSOP package (3.0 mm × 3.0 mm × 1.0 mm height, 0.65 mm pitch), with exposed pad option not specified in DS22184A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | Hardwired to VSS or VCC to set LSB of 3-bit device address; enables multi-device I²C bus configuration |
| A1 | Chip Address Input | Second bit of 3-bit slave address; determines unique I²C address among up to eight devices on same bus |
| A2 | Chip Address Input | MSB of 3-bit slave address; required for cascading multiple 24LC32AF-I/MS units into 256 Kbit contiguous space |
| VSS | Ground Reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up; carries address, command, and data during I²C transactions |
| SCL | Serial Clock Input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input ensures noise immunity |
| WP | Write-Protect Control | Logic-high disables writes to upper 1/4 memory (C00h–FFFh); no effect on reads or lower 3/4 array |
| VCC | Power Supply | 2.5V–5.5V supply input; powers EEPROM core, interface logic, and internal charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-Array Hardware Write-Protect | Physically blocks writes to C00h–FFFh when WP = VCC - eliminates need for software lock bits or firmware checks |
| 32-Byte Page Write Buffer | Reduces I²C bus occupancy by up to 32× vs. byte-write mode - improves system responsiveness during configuration updates |
| Low-Power Operation | 1 μA max standby current at −40°C to +85°C enables battery-backed applications with multi-year shelf life |
| I²C Bus Noise Immunity | Schmitt-trigger inputs + output slope control suppress EMI-induced glitches - critical in motor-driven or switching-power environments |
| Multi-Device Cascading | Three address pins (A0–A2) support up to eight 24LC32AF-I/MS on one I²C bus - simplifies memory expansion without additional controllers |
Applications
| Industrial Sensor Calibration Storage | Automotive Body Control Module (BCM) Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for temperature, pressure, and humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter storage accessible via I²C during power-up initialization. Use Value: Enables field-replaceable sensor modules without recalibration; leverages hardware write-protect to prevent corruption of calibrated values during runtime. | Use Scenario: Holding user-configurable settings (e.g., door lock behavior, mirror position memory, lighting profiles) in 12V automotive BCMs. IC Role / Device Role / Timing Role: Dedicated EEPROM for infrequently updated but mission-critical configuration data, isolated from main MCU flash wear. Use Value: Guarantees >200-year data retention and >1M write cycles - exceeds vehicle lifetime requirements while supporting over-the-air update rollback. |
| Medical Device Parameter Archiving | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Recording operational history (e.g., dose counters, error logs, calibration timestamps) in portable infusion pumps and glucose monitors. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory interfaced directly to ARM Cortex-M0+ MCU via I²C for audit-trail logging. Use Value: Meets IEC 62304 Class B software safety requirements through deterministic write timing (5 ms max) and hardware write-locking of critical fields. | Use Scenario: Storing delta patches applied to meter firmware during remote upgrades, allowing safe rollback if patch validation fails. IC Role / Device Role / Timing Role: Secondary boot-time configuration store holding patch metadata and version flags, accessed before main application launch. Use Value: Prevents bricking during OTA updates by isolating patch control logic from primary flash; 32-byte page writes enable atomic flag updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA32AF-I/MS | Lower VCC min (1.7V), identical pinout and I²C protocol; shares same MSOP-8 package and 32-byte page buffer | Supports battery-powered devices down to 1.7V; not rated for automotive temp range | Select when system operates below 2.5V or requires extended low-voltage functionality |
| AT24C32D-MAHM-T | Same 32Kbit size, 1.7–5.5V range, and MSOP-8 package; includes write-cycle suspend/resume and enhanced ESD (6kV) | Offers higher ESD tolerance and flexible write-interrupt capability - beneficial in noisy industrial environments | Choose for improved robustness in high-noise applications or where partial-page writes must be interruptible |
Compared with 24AA32AF-I/MS and AT24C32D-MAHM-T, the 24LC32AF-I/MS provides guaranteed 2.5V minimum operation and industrial temperature qualification - making it optimal for 3.3V/5V fixed-supply systems requiring long-term reliability without ultra-low-voltage support.
Availability
24LC32AF-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive body control module configuration, medical device parameter archiving, and smart energy meter firmware patch storage requiring stable component supply across production lifecycles.
Supply support for 24LC32AF-I/MS 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC32AF belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in industrial, automotive, and medical applications demanding long data retention and high endurance.
FAQ
What is the minimum supply voltage required for reliable operation of the 24LC32AF-I/MS?
The 24LC32AF-I/MS requires a minimum VCC of 2.5V for guaranteed operation - unlike the 24AA32AF variant, which supports down to 1.7V. Below 2.5V, I²C clock speed is limited to 100 kHz and functionality is not assured. This specification is confirmed in the Device Selection Table and Electrical Characteristics section of DS22184A.
Does the 24LC32AF-I/MS support write-protection of the entire memory array?
No, the 24LC32AF-I/MS only supports hardware write-protection of the upper 1/4 array (addresses C00h–FFFh) via the WP pin. The lower 3/4 (000h–BFFh) remains writable regardless of WP state. Full-array protection requires external logic or firmware-level access control - a design constraint explicitly documented in Section 6.3 of DS22184A.
What is the maximum page write size supported by the 24LC32AF-I/MS?
The 24LC32AF-I/MS supports a maximum page write size of 32 bytes, as defined by its on-chip page latch architecture. Attempting to write more than 32 bytes before issuing a Stop condition causes address wraparound within the current page - a behavior verified in Figure 6-2 and Section 6.2 of DS22184A.
Is the 24LC32AF-I/MS pin-compatible with the 24AA32AF-I/MS?
Yes, the 24LC32AF-I/MS and 24AA32AF-I/MS share identical MSOP-8 pinout, pin functions, and package dimensions - confirmed in Table 2-1 and Package Types diagram of DS22184A. However, they differ in minimum VCC (2.5V vs. 1.7V) and temperature grading options, so electrical compatibility must be verified per application.
How does the 24LC32AF-I/MS handle I²C bus arbitration during simultaneous master access?
The 24LC32AF-I/MS operates exclusively as an I²C slave device and does not implement bus arbitration logic. Arbitration is handled entirely by the master controller per I²C specification - the 24LC32AF-I/MS responds only when addressed and asserts ACK/NACK as defined in Section 4.5 of DS22184A. No internal arbitration circuitry exists.
24LC32AF-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 5ms
- 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-MSOP
24LC32AF-I/MS FAQ
1.How can I place an order for 24LC32AF-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-I/MS 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 24LC32AF-I/MS reliable?
The price and inventory of 24LC32AF-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AF-I/MS is usually 5 days.
3.What payment methods are accepted for 24LC32AF-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-I/MS?
24LC32AF-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-I/MS 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 24LC32AF-I/MS?
For technical support, including 24LC32AF-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-I/MS requirements.
6.How does Aetrix verify that 24LC32AF-I/MS is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-I/MS 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 24LC32AF-I/MS meets industry standards.
7.What is the process for return or replacement of 24LC32AF-I/MS?
All 24LC32AF-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-I/MS, 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 24LC32AF-I/MS part is unused and in its original packaging.
Return procedure for 24LC32AF-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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