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Microchip Technology 24LC32AT-I/SM
- Part No.:
- 24LC32AT-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24LC32AT-I/SM.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
24LC32AT-I/SM from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz clock support, 5 ms max page write time, and hardware write-protection via the WP pin. It delivers 1 µA standby current and supports industrial temperature range (–40°C to +85°C) in an 8-lead MSOP package for embedded system configuration storage.
For engineers reviewing the 24LC32AT-I/SM datasheet, 24LC32AT-I/SM pinout, 24LC32AT-I/SM application, or 24LC32AT-I/SM equivalent, key selection criteria include VCC min/max compliance, I²C timing at target clock frequency, page buffer size (32 bytes), endurance (1M cycles), and WP pin behavior under system-level write-lock requirements.
Technical Context
The 24LC32AT-I/SM implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while the 32-byte page buffer allows burst writes within physical page boundaries (0x000–0x01F, 0x020–0x03F, etc.).
Write protection is enforced by sampling the WP pin at the Stop bit of each write command; tying WP to VCC disables all array writes but permits reads. Acknowledge polling is required to detect write cycle completion, as the device halts ACK generation during the self-timed 5 ms erase/write operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware parameters or calibration data in space-constrained designs |
| VCC Range | 2.5V to 5.5V - requires no level-shifting when interfacing with 3.3V or 5V microcontrollers |
| Max Clock Frequency | 400 kHz - supports high-speed I²C mode for reduced transaction latency in real-time systems |
| Page Write Buffer | 32 bytes - allows efficient bulk updates without exceeding per-page endurance limits |
| Write Cycle Time | 5 ms maximum - defines minimum inter-write interval; impacts system responsiveness during configuration saves |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in frequently updated applications like metering or logging |
| Data Retention | 200 years at +25°C - guarantees nonvolatile data integrity over product lifetime without refresh |
Pinout & Package
24LC32AT-I/SM uses an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm pitch, and exposed pad optional connection to VSS. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit device address; sets I²C client address (1010A2A1A0) to enable up to eight devices on one bus |
| A1 | Chip Address Input | Middle bit of device address; must be hardwired to VSS or VCC - not floating - to ensure deterministic addressing |
| A2 | Chip Address Input | MSB of device address; combined with A0/A1, selects unique 7-bit I²C address from 1010000 to 1010111 |
| VSS | Ground Reference | Primary return path for I/O and core logic; must be low-impedance to maintain noise margin on Schmitt-trigger inputs |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ for 400 kHz); changes only during SCL low to avoid false Start/Stop |
| SCL | Serial Clock Input | Master-generated clock synchronizing all transfers; rising edge samples data, falling edge drives data |
| WP | Write-Protect Control | Active-high lock: tied to VCC blocks all writes (including page/byte) but allows unlimited reads; sampled at Stop bit |
| VCC | Power Supply | Core supply input (2.5–5.5V); powers EEPROM array, logic, and I/O buffers; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs on SDA/SCL | Eliminates false triggering from slow-rising or noisy bus signals, improving robustness in electrically harsh environments |
| Output slope control | Reduces ground bounce and EMI during signal transitions, critical for mixed-signal PCB layouts |
| Hardware write-protect (WP pin) | Provides fail-safe, pin-level disable of all write operations - no firmware dependency required for critical configuration lockdown |
| 100 kHz / 400 kHz clock compatibility | Enables interoperability with legacy 100 kHz controllers and modern high-speed I²C masters without redesign |
| ESD protection >4,000V | Meets HBM Class 3A requirements, reducing need for external TVS diodes in handling-sensitive applications |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and linearization tables in programmable pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration data accessed at power-up and updated during field recalibration. Use Value: Enables traceable, tamper-resistant calibration storage with 200-year retention and hardware write-lock to prevent accidental corruption during service. | Use Scenario: Saving user-selectable therapy parameters (e.g., infusion rate, alarm thresholds) in portable insulin pumps or dialysis controllers. IC Role / Device Role / Timing Role: Secure parameter store with WP pin grounded during normal operation and tied to VCC during firmware update to prevent runtime writes. Use Value: Guarantees patient safety-critical settings survive power loss and resist unintended modification via hardware-enforced write protection. |
| Smart Energy Meter Firmware Settings | Automotive Body Control Module (BCM) Trim Values |
Use Scenario: Holding tariff schedules, demand-response flags, and utility-defined billing parameters in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: I²C-configurable NVM storing regulatory-mandated operational parameters updated infrequently but requiring high endurance. Use Value: Delivers 1 million write cycles and 2.5–5.5V operation compatible with meter MCU rails, ensuring decade-long field reliability. | Use Scenario: Storing seat position memory, mirror angle offsets, and lighting dimming profiles in automotive BCMs compliant with AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Automotive-qualified EEPROM retaining user preferences across ignition cycles with guaranteed operation from –40°C to +85°C. Use Value: Meets automotive temperature and qualification requirements while supporting fast 400 kHz I²C writes during vehicle personalization routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32A-I/P | Same electrical specs and memory map, but in 8-lead PDIP package (longer lead form, through-hole mounting) | Preferred for prototyping, legacy board rework, or applications requiring manual soldering or socket-based replacement | Select when mechanical fit or hand-soldering capability outweighs space constraints; identical firmware and timing behavior |
| AT24C32D-SSHM-T | 32-Kbit I²C EEPROM with 1.7–5.5V VCC range, 1 MHz max clock, and 100-year data retention (vs. 200 years) | Supports lower-voltage systems (1.7V) and higher-speed buses, but lacks AEC-Q100 qualification and has reduced retention | Choose for battery-powered IoT nodes needing ultra-low VCC operation; verify retention requirement alignment before substitution |
Compared with 24LC32AT-I/SM, the 24LC32A-I/P offers identical functionality in a through-hole package for ease of evaluation, while the AT24C32D-SSHM-T extends voltage range and speed at the cost of automotive qualification and long-term data retention - making each suitable for distinct design priorities.
Availability
24LC32AT-I/SM is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy meter firmware settings, and automotive body control module trim values requiring stable component supply across extended production lifecycles.
Supply support for 24LC32AT-I/SM 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 24LC32A family is designed for reliable, low-power nonvolatile data storage in embedded systems where I²C interface simplicity, hardware write protection, and industrial temperature operation are essential.
FAQ
What is the minimum VCC required for reliable operation of the 24LC32AT-I/SM?
The 24LC32AT-I/SM 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 24AA32A variant, which operates down to 1.7V. Using 24LC32AT-I/SM at voltages less than 2.5V may result in undefined behavior, failed writes, or communication errors.
How does the WP pin function on the 24LC32AT-I/SM during a write operation?
The WP pin on the 24LC32AT-I/SM is sampled at the Stop bit of each write command. When tied to VCC, it inhibits all write operations (byte and page) to the entire memory array (0x000–0xFFF), while read operations remain fully functional. The 24LC32AT-I/SM acknowledges the write command but performs no internal programming - allowing the host to proceed without timeout errors.
Can the 24LC32AT-I/SM perform sequential reads across multiple pages?
No, the 24LC32AT-I/SM supports sequential reads only within a single 4K address space, with automatic rollover from address 0xFFF to 0x000. It does not support cross-page sequential reads - attempting to read beyond a 32-byte page boundary does not advance to the next physical page. Software must manage page boundaries explicitly during bulk reads.
What is the maximum number of 24LC32AT-I/SM devices that can share the same I²C bus?
Up to eight 24LC32AT-I/SM devices can share a single I²C bus using the A0, A1, and A2 address pins to configure unique 7-bit client addresses (1010A2A1A0). Each pin must be hardwired to VSS or VCC - floating connections are invalid and will cause bus contention or unpredictable addressing.
Is the 24LC32AT-I/SM qualified for automotive applications?
Yes, the 24LC32A series - including the 24LC32AT-I/SM - is AEC-Q100 qualified for automotive applications. It meets Grade 2 temperature requirements (–40°C to +105°C), though the "I" suffix denotes industrial grade (–40°C to +85°C); the part is fully qualified and widely deployed in automotive body control, infotainment, and ADAS subsystems.
24LC32AT-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIJ
24LC32AT-I/SM FAQ
1.How can I place an order for 24LC32AT-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AT-I/SM 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 24LC32AT-I/SM reliable?
The price and inventory of 24LC32AT-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AT-I/SM is usually 5 days.
3.What payment methods are accepted for 24LC32AT-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AT-I/SM?
24LC32AT-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AT-I/SM 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 24LC32AT-I/SM?
For technical support, including 24LC32AT-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-I/SM requirements.
6.How does Aetrix verify that 24LC32AT-I/SM is sourced from the original manufacturer or authorized distributors?
All 24LC32AT-I/SM 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 24LC32AT-I/SM meets industry standards.
7.What is the process for return or replacement of 24LC32AT-I/SM?
All 24LC32AT-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-I/SM, 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 24LC32AT-I/SM part is unused and in its original packaging.
Return procedure for 24LC32AT-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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