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Microchip Technology 24LC32AF-E/SN
- Part No.:
- 24LC32AF-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC32AF-E/SN.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,228
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Product details
Overview
24LC32AF-E/SN 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 ranges (–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 as nonvolatile configuration storage in embedded control modules.
For engineers reviewing the 24LC32AF-E/SN datasheet, 24LC32AF-E/SN pinout, 24LC32AF-E/SN application, or 24LC32AF-E/SN equivalent, key selection criteria include VCC min (2.5V), WP-enabled quarter-array protection, SOT-23 package compatibility, and automotive-grade endurance (1M cycles, >200 years retention).
Technical Context
The 24LC32AF-E/SN implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address counter supports current-address, random, and sequential reads across the full 4K-word space.
Page write buffering (32-byte) enables burst writes within physical page boundaries; write cycles are self-timed and interruptible via ACK polling. The WP pin samples at the Stop bit to enforce hardware-level write-protection on addresses C00h–FFFh without software overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4K × 8-bit), enabling storage of firmware parameters or calibration data in compact systems |
| VCC range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains; excludes 1.7V operation (reserved for 24AA32AF) |
| Max clock frequency | 400 kHz (≥2.5V); 100 kHz only if VCC <2.5V - defines maximum I²C bus throughput in automotive environments |
| Write cycle time | 5 ms max (byte or page) - determines minimum latency between successive write commands |
| Endurance | 1,000,000 erase/write cycles - supports frequent field-updatable configurations in industrial controllers |
| Data retention | >200 years at +85°C - ensures long-term reliability in unattended equipment without battery backup |
| Write-protect scope | Hardware-enforced protection of upper 1/4 array (C00h–FFFh) - isolates critical boot code or security keys from accidental overwrite |
Pinout & Package
24LC32AF-E/SN uses a 5-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for space-constrained PCB layouts. Unlike 8-lead variants, it omits A0/A1/A2 address pins - fixed slave address '1010000' (A2=A1=A0=0) per I²C protocol.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SCL | Serial Clock input | Synchronizes all I²C transactions; requires external pull-up; supports 100/400 kHz timing per VCC level |
| 2: VSS | Ground reference | Common return path for all internal circuitry and I/O; must be low-impedance to minimize noise coupling |
| 3: SDA | Serial Data bidirectional I/O | Open-drain output requiring external pull-up; transmits/receives addresses and data; shares bus with other I²C slaves |
| 4: VCC | Power supply | 2.5V–5.5V input; powers EEPROM core and interface logic; bypass capacitor recommended near pin |
| 5: WP | Write-Protect input | Logic-high (VCC) disables writes to C00h–FFFh; logic-low (VSS) enables full-array write access |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature grade | Rated –40°C to +125°C (E-temp), qualified for under-hood and ADAS subsystems requiring extended thermal stability |
| I²C bus scalability | Fixed 7-bit address (1010000) eliminates address-pin routing complexity; simplifies multi-device designs where only one EEPROM is needed |
| Low-power operation | Standby current ≤1 μA (automotive), read current ≤400 μA - extends battery life in always-on telematics modules |
| Noise-immune interface | Schmitt-trigger inputs + output slope control suppress EMI-induced glitches and ground bounce during fast transitions |
| Page write buffer | 32-byte buffer enables efficient bulk writes (e.g., logging sensor history) without host CPU intervention between bytes |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and runtime fault logs in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed via I²C during power-up and runtime diagnostics. Use Value: Enables field-reprogrammable behavior without firmware updates; WP pin protects factory calibration values from corruption. |
Use Scenario: Retaining door lock settings, mirror position presets, and lighting profiles across ignition cycles in BCMs. IC Role / Device Role / Timing Role: Persistent configuration store interfaced to MCU over I²C; accessed during startup and user input events. Use Value: Automotive-grade temperature tolerance ensures reliable operation in cabin environments; 1M-cycle endurance supports daily reconfiguration. |
| Medical Device Calibration Memory | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding sensor gain/offset coefficients and regulatory compliance flags in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for calibration data validated before each measurement cycle. Use Value: Hardware write-protect (WP=VCC) prevents accidental overwrites of certified calibration constants during service mode. |
Use Scenario: Storing tariff schedules, metering constants, and communication credentials in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Long-life nonvolatile memory accessed by metrology MCU during initialization and firmware upgrades. Use Value: >200-year data retention guarantees integrity of billing parameters over product lifetime without maintenance. |
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/SN | Same 32 Kbit capacity, I-temp (–40°C to +85°C), identical SOT-23 pinout and I²C protocol; lacks automotive qualification | Not rated for automotive under-hood use; suitable for commercial/industrial indoor applications only | Select when automotive qualification is unnecessary and cost optimization is prioritized |
| AT24C32D-SSHM-T | 32 Kbit I²C EEPROM, 1.7V–5.5V VCC, 1 MHz max clock, SOIC-8 package; no WP pin; different slave address (1010xxx) | Requires PCB redesign due to 8-lead SOIC footprint and absence of hardware write-protect | Choose only if higher-speed I²C (1 MHz) and wider voltage range are required, and WP functionality is implemented in software |
Compared with 24LC32AF-E/SN, the 24LC32AT-I/SN offers identical electrical and functional behavior but lacks automotive qualification, while the AT24C32D-SSHM-T provides faster clock support and broader VCC range but sacrifices WP pin functionality and requires layout changes.
Availability
24LC32AF-E/SN is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical calibration systems, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32AF-E/SN 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC32AF-E/SN belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power nonvolatile storage in automotive and industrial applications demanding high reliability and extended temperature operation.
FAQ
What is the minimum VCC required for 24LC32AF-E/SN operation?
The 24LC32AF-E/SN requires a minimum VCC of 2.5V, as specified in its device selection table. This distinguishes it from the 24AA32AF variant, which supports down to 1.7V. Operating below 2.5V may result in undefined behavior or failure to acknowledge I²C commands.
Does 24LC32AF-E/SN support multiple devices on the same I²C bus?
No, the 24LC32AF-E/SN uses a fixed 7-bit slave address (1010000) because it is packaged in the 5-lead SOT-23 format, which omits A0, A1, and A2 address pins. To connect multiple EEPROMs, use 8-lead variants like 24LC32AF-I/SN with configurable address pins.
How does the WP pin function on 24LC32AF-E/SN?
When WP is tied to VCC, the 24LC32AF-E/SN hardware-write-protects memory addresses C00h–FFFh (upper 1/4 array); reads remain enabled. When WP is tied to VSS, full-array write access is permitted. The pin is sampled at the Stop bit of each write command.
What is the maximum page write size for 24LC32AF-E/SN?
The 24LC32AF-E/SN supports a 32-byte page write buffer. Writes crossing physical page boundaries (every 32 bytes, aligned to 0x00, 0x20, etc.) wrap around within the same page instead of advancing to the next page, requiring firmware to manage alignment.
Is 24LC32AF-E/SN qualified for automotive applications?
Yes, the "E" suffix in 24LC32AF-E/SN denotes automotive qualification per Microchip's specifications: guaranteed operation from –40°C to +125°C, with 1 million erase/write cycles and >200 years data retention at +85°C, meeting AEC-Q100 stress test requirements.
24LC32AF-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC32AF-E/SN FAQ
1.How can I place an order for 24LC32AF-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-E/SN 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/SN reliable?
The price and inventory of 24LC32AF-E/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 24LC32AF-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-E/SN?
24LC32AF-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-E/SN 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/SN?
For technical support, including 24LC32AF-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-E/SN requirements.
6.How does Aetrix verify that 24LC32AF-E/SN is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-E/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 24LC32AF-E/SN?
All 24LC32AF-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-E/SN, 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/SN part is unused and in its original packaging.
Return procedure for 24LC32AF-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32AF-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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