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Microchip Technology 24LC32AF-E/P
- Part No.:
- 24LC32AF-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
24LC32AF-E/P.pdf
- Description:
- IC EEPROM 32KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
24LC32AF-E/P 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 range support (–40°C to +125°C). It features hardware write-protection for the upper 1/4 array (C00h–FFFh), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity. Used in automotive body control modules for storing calibration data and configuration parameters.
For engineers reviewing the 24LC32AF-E/P datasheet, 24LC32AF-E/P pinout, 24LC32AF-E/P application, or 24LC32AF-E/P equivalent, key selection criteria include VCC min/max compliance (2.5–5.5V), automotive-grade temperature operation (–40°C to +125°C), quarter-array hardware write-protect, 400 kHz I²C clock capability, and PDIP package compatibility with legacy through-hole designs.
Technical Context
The 24LC32AF-E/P implements a standard two-wire I²C interface with slave addressing via A0–A2 pins (not present in SOT-23 variant but retained in PDIP), supporting up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, EEPROM array with self-timed erase/write cycles, and dedicated write-protect logic sampling WP at the Stop bit.
It uses CMOS process technology optimized for low-power operation: standby current ≤1 μA (automotive grade), read current ≤400 μA, and page write time ≤5 ms. All I/O pins feature Schmitt-trigger inputs and slope-controlled outputs to suppress ground bounce and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit) nonvolatile storage |
| VCC operating range | 2.5V to 5.5V - supports 3.3V and 5V systems without level shifting |
| Max I²C clock frequency | 400 kHz - enables high-speed configuration updates in automotive ECUs |
| Write endurance | 1,000,000 cycles - suitable for frequent parameter logging in telematics units |
| Data retention | 200 years at +85°C - ensures long-term reliability in sealed automotive environments |
| Temperature grade | Automotive (E): –40°C to +125°C - qualified per AEC-Q100 stress test requirements |
| Write-protect scope | Hardware lock for addresses C00h–FFFh (16 Kbit) - prevents accidental overwrites of critical firmware settings |
Pinout & Package
24LC32AF-E/P is supplied in an 8-lead plastic dual in-line package (PDIP) with 0.300-inch body width, RoHS-compliant matte tin plating, and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | Hardwired logic level sets LSB of 7-bit I²C slave address (1010xxx) |
| A1 | Chip address input | Hardwired logic level sets middle bit of I²C slave address |
| A2 | Chip address input | Hardwired logic level sets MSB of I²C slave address - enables multi-device bus expansion |
| VSS | Ground reference | Return path for all internal circuitry and I/O signals |
| SDA | Serial data I/O | Open-drain bidirectional bus line requiring external pull-up; carries address/data and ACK/NACK |
| SCL | Serial clock input | Master-generated synchronous clock; controls timing of all I²C transfers |
| WP | Write-protect control | Active-high enable: ties to VCC to lock upper 1/4 memory (C00h–FFFh) against writes |
| VCC | Power supply | Primary power rail (2.5–5.5V); powers EEPROM core, interface logic, and charge pump |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-array hardware write-protect | Prevents corruption of critical calibration data stored in upper 16 Kbit without software overhead |
| 32-byte page write buffer | Reduces I²C transaction count by up to 32× versus byte-write - improves bus efficiency in real-time systems |
| Schmitt-trigger inputs on SDA/SCL | Rejects >50 ns noise spikes and ensures clean signal detection in electrically noisy vehicle cabins |
| Self-timed erase/write cycle | Eliminates need for external timing control or polling delay management in host firmware |
| ESD protection >4 kV | Withstands handling and assembly-level electrostatic discharge per HBM, reducing field failure risk |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles across ignition cycles in mid-tier vehicles. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding user-defined settings accessible via microcontroller I²C master. Use Value: Hardware write-protect (WP = VCC) prevents accidental overwrite during CAN-based diagnostic sessions while allowing runtime reads. | Use Scenario: Retaining I/O mapping tables, PID tuning parameters, and alarm thresholds in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced to ARM Cortex-M host MCU over 400 kHz I²C bus. Use Value: 200-year data retention ensures parameter integrity over full product lifecycle without battery backup. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding flow-rate calibration coefficients and safety limit values updated during factory service or field recalibration. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory segment accessed only during authenticated service mode. Use Value: WP pin tied to service-mode enable signal provides physical write-gating - no software vulnerability surface. | Use Scenario: Storing signed firmware patch images and version metadata for secure over-the-air (OTA) updates in utility-grade meters. IC Role / Device Role / Timing Role: Boot-time configuration store verified before executing patched code segments. Use Value: 1 million write cycles support repeated field updates across 15+ year meter deployment life. |
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 32 Kbit capacity, 1.7–5.5V VCC range, but rated only for industrial temp (–40°C to +85°C); no automotive qualification | Lacks AEC-Q100 compliance - unsuitable for under-hood or dashboard-mounted automotive use | Select only for cost-sensitive industrial control where extended temperature is not required |
| BR24G32FJ-3GE2 | 32 Kbit I²C EEPROM with 1.6–5.5V operation and built-in error correction (ECC); automotive-grade (–40°C to +125°C) | Includes on-chip ECC for enhanced data integrity in high-radiation or EMI-heavy environments | Choose when system-level functional safety (e.g., ISO 26262 ASIL-B) mandates error-detectable memory |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AF-E/P delivers automotive-qualified reliability at lower gate count and BOM cost, with deterministic write timing and proven integration in legacy ECU platforms - ideal where ECC is unnecessary and AEC-Q100 compliance is mandatory.
Availability
24LC32AF-E/P is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical device manufacturing requiring stable component supply with guaranteed long-term availability.
Supply support for 24LC32AF-E/P 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 24XX32AF family of I²C serial EEPROMs designed specifically for automotive and industrial applications demanding extended temperature operation, high endurance, and hardware-level data protection.
FAQ
What is the minimum supply voltage required for reliable operation of the 24LC32AF-E/P?
The 24LC32AF-E/P requires a minimum VCC of 2.5V for guaranteed operation across its full automotive temperature range (–40°C to +125°C). Below 2.5V, functionality is not assured - unlike the 24AA32AF variant, which supports down to 1.7V. This 2.5V floor ensures robust performance in 3.3V automotive domains with marginal rail droop.
Does the 24LC32AF-E/P support 400 kHz I²C communication at all operating voltages?
Yes, the 24LC32AF-E/P supports up to 400 kHz I²C clock frequency across its entire specified VCC range (2.5V to 5.5V) and full automotive temperature range. The datasheet confirms 400 kHz operation is valid for VCC ≥ 2.5V - no derating is required at 3.3V or 5V rails.
How does the hardware write-protect function work on the 24LC32AF-E/P?
The WP pin on the 24LC32AF-E/P enables hardware write-protection for the upper 1/4 memory block (addresses C00h–FFFh) when pulled high to VCC. When WP = VSS, full memory is writable. Protection is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect, ensuring deterministic behavior during bus arbitration.
What package type does the 24LC32AF-E/P use, and is it compatible with standard PDIP footprints?
The 24LC32AF-E/P uses an 8-lead plastic dual in-line package (PDIP) with 0.300-inch body width and standard 0.100-inch pin pitch. It is fully compatible with industry-standard DIP-8 sockets and PCB footprints used for legacy microcontrollers and memory ICs, enabling drop-in replacement in existing through-hole designs.
Can multiple 24LC32AF-E/P devices share the same I²C bus, and how is addressing managed?
Yes, up to eight 24LC32AF-E/P devices can share one I²C bus using hardwired A0, A1, and A2 pins to configure unique 3-bit chip address bits. These pins must be statically tied to VSS or VCC - they are not dynamically controlled. Each device responds only to its assigned 7-bit slave address (1010xxx), enabling scalable memory expansion without additional GPIOs.
24LC32AF-E/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
24LC32AF-E/P FAQ
1.How can I place an order for 24LC32AF-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-E/P 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/P reliable?
The price and inventory of 24LC32AF-E/P 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/P is usually 5 days.
3.What payment methods are accepted for 24LC32AF-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-E/P?
24LC32AF-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-E/P 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/P?
For technical support, including 24LC32AF-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-E/P requirements.
6.How does Aetrix verify that 24LC32AF-E/P is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-E/P 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/P meets industry standards.
7.What is the process for return or replacement of 24LC32AF-E/P?
All 24LC32AF-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-E/P, 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/P part is unused and in its original packaging.
Return procedure for 24LC32AF-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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