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Microchip Technology 24LC32AF-I/SN
- Part No.:
- 24LC32AF-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC32AF-I/SN.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:411
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Product details
Overview
24LC32AF-I/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 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 serves in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.
For engineers reviewing the 24LC32AF-I/SN datasheet, 24LC32AF-I/SN pinout, 24LC32AF-I/SN application, or 24LC32AF-I/SN equivalent, key selection criteria include VCC min (2.5V), page write buffer size (32 bytes), WP-enabled quarter-array protection, I²C clock compatibility (100/400 kHz), and SOIC-8 package footprint compatibility with legacy 24C32 designs.
Technical Context
The 24LC32AF-I/SN implements a two-wire I²C slave interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and internal address pointer auto-increment for sequential reads. Its EEPROM array uses floating-gate technology with >1 million erase/write cycles and >200 years data retention.
Write operations support byte-write and 32-byte page-write modes with self-timed 5 ms max write cycle; write-protection is controlled by the WP pin, which disables writes to addresses C00h–FFFh when pulled high. Acknowledge polling enables bus-efficient status checking during internal write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit) - supports firmware configuration tables and multi-sensor calibration datasets |
| VCC Operating Range | 2.5V to 5.5V - compatible with 3.3V and 5V logic systems; excludes sub-2.5V operation unlike 24AA32AF |
| Max Clock Frequency | 400 kHz (≥2.5V) - enables faster parameter loading vs. 100 kHz mode; timing validated per Table 1-2 |
| Page Write Buffer | 32 bytes - reduces I²C transaction count for bulk updates; physical page boundaries align to 32-byte offsets |
| Write Protection | Hardware-enabled for C00h–FFFh (upper 1/4) via WP pin - prevents accidental overwrite of critical firmware flags or security keys |
| Endurance & Retention | 1,000,000 write cycles / >200 years data retention - suitable for field-deployed devices requiring long-term reliability without refresh |
| ESD Rating | >4,000V HBM - robust against handling and board-level ESD events in industrial assembly environments |
Pinout & Package
24LC32AF-I/SN is supplied in an 8-pin SOIC package (SOIC-8, 3.9 mm width), pin-compatible with industry-standard 24Cxx EEPROM footprints. The package meets RoHS and Pb-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit device address; hardwired to VSS or VCC to select one of eight possible I²C addresses on shared bus |
| A1 | Chip Address Input | Middle bit of device address; enables cascading up to eight 24LC32AF-I/SN devices for 256 Kbit total address space |
| A2 | Chip Address Input | MSB of device address; required for multi-device arbitration; not present in SOT-23 variant |
| VSS | Ground Reference | Primary return path for all internal circuitry; must be low-impedance connection to system GND plane |
| SDA | Serial Data I/O | Open-drain bidirectional bus line; requires external pull-up (2 kΩ typical for 400 kHz); carries address, command, and data |
| SCL | Serial Clock Input | Master-generated clock signal; synchronizes all data transfers; Schmitt-trigger input rejects noise below hysteresis threshold |
| WP | Write-Protect Control | Active-high enable for upper-quadrant write lock; tied to VCC to protect C00h–FFFh; no effect on read operations |
| VCC | Power Supply | 2.5V–5.5V supply input; powers EEPROM core, interface logic, and charge pump; decoupling capacitor (0.1 μF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-Array Hardware Write-Protection | WP pin disables writes only to addresses C00h–FFFh, preserving factory-set parameters while allowing runtime update of user data sections |
| 32-Byte Page Write Buffer | Reduces required I²C Start/Stop sequences by up to 32× vs. byte-write for contiguous data blocks, lowering bus overhead and CPU load |
| Low-Power Operation | 1 μA max standby current at 85°C enables use in battery-backed or energy-harvesting systems without compromising sleep-mode efficiency |
| I²C Bus Noise Immunity | Schmitt-trigger inputs (min. 5% VCC hysteresis) and input filter spike suppression (50 ns) reject transient coupling on SDA/SCL lines |
| Self-Timed Write Cycle | 5 ms max internal erase/write eliminates need for software delay loops; ACK polling allows precise completion detection without fixed timeouts |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Storing calibrated offset/gain coefficients and sensor linearization tables in a wireless temperature/humidity node. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during boot and after field recalibration; retains values across power cycles. Use Value: Enables field-upgradable calibration without firmware reflash; WP protection prevents corruption of factory-trimmed values during routine updates. |
Use Scenario: Holding patient-specific therapy parameters and usage logs in a portable infusion pump. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter archive with write-lock for regulatory-critical settings. Use Value: Meets IEC 62304 data integrity requirements; 1M-cycle endurance supports 10+ years of daily log entries. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Saving seat/mirror position presets and lighting profiles in a vehicle BCM. IC Role / Device Role / Timing Role: I²C-configurable memory mapped into microcontroller's peripheral address space for fast access. Use Value: Industrial temp rating (–40°C to +85°C) ensures reliability under hood conditions; SOIC-8 footprint simplifies PCB layout reuse. |
Use Scenario: Recording tariff schedules, demand-response event history, and meter firmware version in utility-grade meters. IC Role / Device Role / Timing Role: Long-life data logger with >200-year retention; accessed infrequently but must survive 15+ year deployments. Use Value: Eliminates need for battery-backed SRAM; 4 kV ESD rating withstands meter installation handling and surge events. |
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 supports 1 MHz I²C; no hardware WP pin - relies on software lock bits | Lacks hardware write-protect; requires firmware-level access control instead of pin-strapped protection | Select when higher-speed I²C (1 MHz) is needed and WP functionality is managed in software |
| BR24G32FJ-3GE2 | 32 Kbit, 1.6–5.5V operation, built-in error correction (ECC), and 10 million write cycles; uses different I²C address map (0x50–0x57) | ECC enables reliable operation in high-radiation or noisy environments where bit flips are a concern | Select when extended endurance and fault-tolerant data integrity are prioritized over pin-for-pin compatibility |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AF-I/SN provides deterministic hardware-based write protection and proven industrial-temperature reliability in a widely adopted SOIC-8 footprint, making it optimal for cost-sensitive, safety-aware designs where WP pin control is mandatory.
Availability
24LC32AF-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and smart energy metering requiring stable component supply and long-term lifecycle support.
Supply support for 24LC32AF-I/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 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 low-power, high-reliability nonvolatile data storage in space-constrained embedded systems across industrial, automotive, and medical markets.
FAQ
What is the minimum VCC voltage required for reliable operation of the 24LC32AF-I/SN?
The 24LC32AF-I/SN requires a minimum VCC of 2.5V for full specification compliance, including 400 kHz I²C operation and guaranteed write functionality. Operation below 2.5V is not supported - unlike the 24AA32AF variant, which operates down to 1.7V. This 2.5V floor ensures stable internal charge pump performance and EEPROM programming margin across the industrial temperature range.
Does the 24LC32AF-I/SN support 1 MHz I²C communication?
No, the 24LC32AF-I/SN supports maximum clock frequencies of 100 kHz (for VCC < 2.5V, though not applicable here) and 400 kHz (for VCC ≥ 2.5V). It does not meet timing specifications for 1 MHz I²C operation. Attempting 1 MHz signaling will result in setup/hold violations and unreliable data transfer, as confirmed by AC characteristics in Table 1-2 of DS22184A.
How does the hardware write-protect feature work on the 24LC32AF-I/SN?
When the WP pin of the 24LC32AF-I/SN is driven high (to VCC), write operations to memory addresses C00h through FFFh (upper 1/4 of the 4K array) are inhibited, while reads remain fully functional. Writes to addresses 000h–BFFh are unaffected. The WP state is sampled at the Stop bit of each write command, providing deterministic, pin-level protection independent of firmware.
What package type is used for the 24LC32AF-I/SN part number?
The 24LC32AF-I/SN uses an 8-pin SOIC package (SOIC-8, 3.90 mm body width), designated by the "SN" suffix per Microchip's packaging nomenclature. This package includes pins A0, A1, A2, VSS, SDA, SCL, WP, and VCC - matching standard 24Cxx footprints and enabling drop-in replacement in existing designs using SOIC-8 EEPROMs.
Can multiple 24LC32AF-I/SN devices share the same I²C bus?
Yes, up to eight 24LC32AF-I/SN devices can operate on a single I²C bus using unique 3-bit device addresses set by hardwiring the A0, A1, and A2 pins to VSS or VCC. Each device responds only to its assigned address (1010xx0 for write, 1010xx1 for read), enabling scalable memory expansion to 256 Kbit without additional address decoding logic.
24LC32AF-I/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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC32AF-I/SN FAQ
1.How can I place an order for 24LC32AF-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-I/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-I/SN reliable?
The price and inventory of 24LC32AF-I/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-I/SN is usually 5 days.
3.What payment methods are accepted for 24LC32AF-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-I/SN?
24LC32AF-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-I/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-I/SN?
For technical support, including 24LC32AF-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-I/SN requirements.
6.How does Aetrix verify that 24LC32AF-I/SN is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-I/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-I/SN meets industry standards.
7.What is the process for return or replacement of 24LC32AF-I/SN?
All 24LC32AF-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-I/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-I/SN part is unused and in its original packaging.
Return procedure for 24LC32AF-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32AF-I/SN Tags
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AT24C02C-XHM-T
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