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Microchip Technology 24LC32AF-E/MS
- Part No.:
- 24LC32AF-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24LC32AF-E/MS.pdf
- Description:
- IC EEPROM 32KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
24LC32AF-E/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 and automotive temperature support (–40°C to +125°C), 400 kHz max clock, 5 ms max page write time, and hardware write-protect for upper 1/4 array (C00h–FFFh). It serves in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 24LC32AF-E/MS datasheet, 24LC32AF-E/MS pinout, 24LC32AF-E/MS application, or 24LC32AF-E/MS equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), automotive-grade temperature operation, quarter-array hardware write-protection, MSOP-8 package footprint, and I²C bus timing compliance at 400 kHz.
Technical Context
The 24LC32AF-E/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, self-timed erase/write cycle, and address pointer logic supporting current-address, random, and sequential read modes.
It uses three hardware address pins (A0–A2) for multi-device bus addressing up to eight units, and a dedicated WP pin sampled at Stop bit to enable/disable write protection on addresses C00h–FFFh. The device supports acknowledge polling to detect write completion without fixed delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware flags, calibration coefficients, or device IDs |
| VCC range | 2.5V to 5.5V - compatible with 3.3V and 5V systems; excludes 1.7V low-voltage operation of 24AA32AF |
| Max clock frequency | 400 kHz (at VCC ≥ 2.5V); ensures high-speed configuration updates without bus contention |
| Page write time | 5 ms max - defines minimum interval between successive page writes in firmware update routines |
| Write endurance | 1 million erase/write cycles - supports long-term field deployment in logging or counter applications |
| Data retention | 200 years - guarantees nonvolatile data integrity across product lifecycle without refresh |
| Temp range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood or industrial control environments |
| Write-protect scope | Hardware-enforced protection of upper 1/4 array (C00h–FFFh) via WP pin - isolates critical firmware parameters from accidental overwrite |
Pinout & Package
The 24LC32AF-E/MS is supplied in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | Hardwired logic level sets LSB of 3-bit slave address; enables up to eight devices on one I²C bus |
| A1 | Chip address input | Second bit of slave address; must be stable before bus communication begins |
| A2 | Chip address input | MSB of slave address; determines unique device identity within multi-drop I²C topology |
| VSS | Ground reference | Return path for all internal circuitry; requires low-impedance connection to system GND plane |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ typical for 400 kHz) and supports ACK/NACK signaling |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input rejects noise on rising/falling edges |
| WP | Write-protect control | Active-high signal disabling writes to C00h–FFFh when tied to VCC; sampled only at Stop condition |
| VCC | Power supply | Primary power rail (2.5–5.5V); supplies EEPROM core, interface logic, and charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| I²C bus compatibility | Fully compliant with standard-mode (100 kHz) and fast-mode (400 kHz) I²C specifications, enabling plug-in integration with MCU I²C peripherals |
| Quarter-array hardware write-protect | Dedicated WP pin physically disables writes to top 8Kbit (C00h–FFFh), protecting boot configuration or security keys without software overhead |
| 32-byte page write buffer | Allows burst programming of up to 32 bytes per write cycle, reducing bus occupancy and improving firmware update efficiency |
| Schmitt-trigger inputs & slope control | Input hysteresis (≥0.05×VCC) and controlled output rise/fall times suppress EMI-induced glitches and prevent ground bounce during switching |
| Automotive temperature grade | Qualified from –40°C to +125°C per AEC-Q100 stress test requirements, suitable for engine control, ADAS, and body electronics |
Applications
| Industrial Sensor Node | Automotive ECU Configuration |
|---|---|
Use Scenario: Storing calibrated offset/gain values and linearization coefficients for temperature, pressure, and humidity sensors in factory automation nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter storage accessible over I²C during power-up or recalibration. Use Value: Eliminates need for external calibration EEPROM or MCU flash wear-leveling; 1M endurance supports lifetime recalibration cycles. | Use Scenario: Retaining vehicle-specific settings (e.g., seat position memory, mirror fold/unfold logic, lighting profiles) in body control modules. IC Role / Device Role / Timing Role: Automotive-grade parameter store interfaced directly to MCU I²C port, surviving cold cranking and load dump events. Use Value: Hardware write-protect (WP) prevents corruption of safety-critical configuration during firmware updates or brownout recovery. |
| Medical Device Calibration | Smart Meter Firmware Parameters |
Use Scenario: Holding factory-calibrated ADC reference points and sensor drift compensation tables in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, long-retention memory for regulatory-mandated calibration data, accessed only during service mode. Use Value: 200-year data retention meets ISO 13485 medical device documentation requirements; E-grade temp range accommodates sterilization cycles. | Use Scenario: Storing tariff schedules, metering constants, and communication credentials in utility smart meters deployed outdoors. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault with hardware write-lock on cryptographic keys and billing parameters. Use Value: Quarter-array write-protect isolates sensitive fields (C00h–FFFh) from field firmware updates, preventing credential overwrite. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32AT-I/MS | Industrial-grade (–40°C to +85°C); identical electrical specs and pinout; no automotive qualification | Lacks AEC-Q100 validation; unsuitable for under-hood or safety-critical automotive use | Select when cost-sensitive industrial designs do not require extended temperature or automotive reliability testing |
| AT24C32D-MAHM-T | Same 32Kbit capacity, I²C interface, and MSOP-8 package; 1.7–5.5V VCC range; no hardware write-protect pin | Relies on software-based write protection; lacks dedicated WP pin for hardware-enforced array segmentation | Choose when full voltage flexibility (1.7V operation) is needed and hardware write-protect is not required |
Compared with 24LC32AF-E/MS, the 24LC32AT-I/MS offers identical functionality at lower cost but omits automotive qualification, while the AT24C32D-MAHM-T extends low-voltage operation but removes hardware write-protect-making the 24LC32AF-E/MS uniquely suited for safety-critical automotive parameter storage requiring physical write-locking.
Availability
24LC32AF-E/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive ECU configuration, medical device calibration, and smart meter firmware parameter storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC32AF-E/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-E/MS belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in automotive, industrial, and medical applications demanding extended temperature operation and hardware write security.
FAQ
What is the maximum clock frequency supported by the 24LC32AF-E/MS?
The 24LC32AF-E/MS supports a maximum I²C clock frequency of 400 kHz when VCC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability ensures interoperability with both legacy and high-performance I²C masters while maintaining signal integrity across varying supply conditions. The 24LC32AF-E/MS does not support operation below 2.5V.
Does the 24LC32AF-E/MS have hardware write protection, and how is it implemented?
Yes, the 24LC32AF-E/MS includes hardware write protection for the upper 1/4 of its memory array (addresses C00h–FFFh) via the WP pin. When WP is tied to VCC, writes to that region are inhibited while reads remain enabled. The pin is sampled only at the Stop condition of each write command, ensuring deterministic protection behavior. This feature is absent in many competing EEPROMs and provides robust safeguarding of critical firmware or calibration data without software intervention.
What package type is used for the 24LC32AF-E/MS, and what are its key mechanical dimensions?
The 24LC32AF-E/MS is packaged in an 8-lead MSOP (Mini Small Outline Package) with dimensions of 3.0 mm × 3.0 mm and a lead pitch of 0.65 mm. It features gull-wing leads suitable for standard SMT reflow processes and complies with JEDEC MO-187 variations. The package marking includes "4LAF" for the part code, "I" for Industrial or "E" for Automotive grade, year/week codes, and traceability characters - confirming the E-grade automotive qualification for this specific variant.
How many devices can be connected on the same I²C bus using the 24LC32AF-E/MS?
Up to eight 24LC32AF-E/MS devices can be connected on a single I²C bus using the three hardware address pins (A0, A1, A2). Each pin must be hardwired to either VCC or VSS to configure a unique 3-bit slave address, allowing contiguous addressing up to 256 Kbits total. The SOT-23 variant lacks these pins and supports only single-device operation, but the MSOP-8 version fully implements this multi-drop capability as confirmed in the Device Selection Table and Pin Function Table.
What is the guaranteed data retention period for the 24LC32AF-E/MS?
The 24LC32AF-E/MS guarantees data retention of greater than 200 years under normal operating conditions (TA ≤ 85°C). This specification is derived from accelerated life testing and applies to data stored in the EEPROM array after a completed write cycle. Retention remains valid across the full automotive temperature range (–40°C to +125°C), making it suitable for applications where field-replacement is impractical and long-term data integrity is mission-critical, such as medical device calibration records or automotive configuration history.
24LC32AF-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
24LC32AF-E/MS FAQ
1.How can I place an order for 24LC32AF-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-E/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-E/MS reliable?
The price and inventory of 24LC32AF-E/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-E/MS is usually 5 days.
3.What payment methods are accepted for 24LC32AF-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-E/MS?
24LC32AF-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-E/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-E/MS?
For technical support, including 24LC32AF-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-E/MS requirements.
6.How does Aetrix verify that 24LC32AF-E/MS is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-E/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-E/MS meets industry standards.
7.What is the process for return or replacement of 24LC32AF-E/MS?
All 24LC32AF-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-E/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-E/MS part is unused and in its original packaging.
Return procedure for 24LC32AF-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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