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Microchip Technology 24LC32A-E/SN
- Part No.:
- 24LC32A-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC32A-E/SN.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
24LC32A-E/SN from Microchip Technology Inc. is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial/extended temperature support (–40°C to +125°C). It features hardware write-protection via the WP pin, 32-byte page write buffer, and 1 µA standby current - used for nonvolatile parameter storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 24LC32A-E/SN datasheet, 24LC32A-E/SN pinout, 24LC32A-E/SN application, or 24LC32A-E/SN equivalent, key selection criteria include VCC range compatibility (2.5V–5.5V), extended-temperature operation (–40°C to +125°C), I²C bus timing compliance at 400 kHz, and hardware write-protect functionality for firmware-safe configuration retention.
Technical Context
The 24LC32A-E/SN implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and internal address pointer logic enabling current-address, random, and sequential read modes. Its EEPROM array supports up to eight devices on one bus using A0–A2 address pins.
Write operations are self-timed with maximum 5 ms byte/page erase/write cycle time; acknowledge polling is supported to detect completion. The device samples the WP pin at the Stop bit of each write command to enable or disable array writes - no write occurs if WP = VCC, but reads remain fully functional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit) nonvolatile EEPROM array |
| VCC Range | 2.5V to 5.5V - compatible with 3.3V and 5V systems; not operable below 2.5V |
| Max Clock Frequency | 400 kHz - enables high-speed I²C communication; drops to 100 kHz only if VCC < 2.5V (not applicable here) |
| Page Write Buffer | 32 bytes - allows burst programming within a single physical page boundary (0–31, 32–63, etc.) |
| Endurance | 1,000,000 erase/write cycles per page - specified at +25°C and 5.5V |
| Data Retention | 200 years at +25°C - ensures long-term reliability for infrequently updated configuration data |
| Temperature Range | –40°C to +125°C (Extended grade) - qualified for automotive and harsh-environment applications |
Pinout & Package
24LC32A-E/SN is supplied in an 8-lead SOIC package (SN suffix), 3.90 mm body width, with gull-wing leads and standard JEDEC MS-012AC footprint. 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; 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; determines unique client address when multiple 24LC32A devices share SDA/SCL lines |
| A2 | Chip Address Input | MSB of device address; enables up to eight devices (000–111 binary) on same I²C bus for 256 Kbit total address space |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be connected to system GND plane |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up resistor (2 kΩ typical for 400 kHz); carries address, data, and ACK/NACK signals |
| SCL | Serial Clock Input | Input-only clock line driven by host controller; synchronizes all data transfers and defines timing windows per I²C spec |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes (reads unaffected); sampled at Stop bit of each write command |
| VCC | Power Supply | Positive supply input (2.5V–5.5V); powers internal EEPROM array, control logic, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs on SDA/SCL | Enables reliable operation in noisy environments by rejecting sub-threshold voltage spikes (50 ns spike suppression) |
| Output slope control | Eliminates ground bounce during switching, preventing false Start/Stop conditions on shared I²C buses |
| Hardware write-protection (WP pin) | Prevents accidental or malicious overwrites of critical calibration or security parameters without hardware modification |
| 100 kHz / 400 kHz clock compatibility | Supports both standard- and fast-mode I²C protocols without external clock dividers or mode selection |
| ESD protection > 4,000 V | Robust handling during board assembly and field service, reducing risk of latent damage from static discharge |
Applications
| Industrial Sensor Calibration | Automotive ECU Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and linearization tables for analog sensor front-ends in PLCs and process transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage IC interfaced via I²C to microcontroller during power-up or maintenance mode. Use Value: Enables field-replaceable sensors without recalibration; retains values across 200-year lifetime and 1M write cycles. | Use Scenario: Holding vehicle-specific configuration data (e.g., VIN-derived settings, trim values, adaptive learning history) in engine control units and body control modules. IC Role / Device Role / Timing Role: Extended-temperature EEPROM providing secure, WP-protected storage for safety-critical configuration parameters. Use Value: AEC-Q100 qualified operation at –40°C to +125°C ensures reliability under hood conditions; hardware write-lock prevents runtime corruption. |
| Medical Device Settings Backup | IoT Edge Node Identity Storage |
Use Scenario: Preserving user-adjusted therapy parameters, alarm thresholds, and audit logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Low-power I²C EEPROM retaining critical operational data during battery-backed sleep states. Use Value: 1 µA standby current extends battery life; 2.5V minimum VCC supports direct connection to Li-ion battery rails. | Use Scenario: Storing cryptographic keys, device certificates, and unique identifiers in battery-powered smart meters and asset trackers. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element accessed only during boot or provisioning via isolated I²C bus. Use Value: Hardware WP pin prevents remote firmware attacks from overwriting identity credentials; RoHS-compliant packaging meets global regulatory requirements. |
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 size, 1.7V–5.5V VCC range, but supports 1 MHz Fast Mode Plus; different WP behavior (active-low on some variants) | Broader low-voltage operation enables use in 1.8V systems where 24LC32A-E/SN cannot operate | Select AT24C32D-SSHM-T only if system VCC may drop below 2.5V or 1 MHz I²C bandwidth is required |
| BR24G32FJ-3GE2 | 32-Kbit I²C EEPROM with 1.6V–5.5V range, built-in error correction (ECC), and 10 million endurance cycles | Higher reliability target for mission-critical data logging; ECC mitigates soft errors in radiation-prone environments | Choose BR24G32FJ-3GE2 when data integrity assurance beyond standard EEPROM specs is mandatory |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32A-E/SN offers guaranteed extended-temperature operation (–40°C to +125°C), AEC-Q100 qualification, and deterministic WP pin behavior - making it preferred for automotive and industrial designs where environmental robustness outweighs ultra-low-voltage or ECC requirements.
Availability
24LC32A-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and medical device settings backup requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32A-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including AEC-Q100.
The 24LC32A belongs to Microchip's 24XX32A family of I²C serial EEPROMs designed for reliable, low-power nonvolatile data storage in automotive, industrial, and medical systems requiring extended temperature operation and hardware write protection.
FAQ
What is the operating voltage range for the 24LC32A-E/SN?
The 24LC32A-E/SN operates from 2.5V to 5.5V DC. It is not rated for operation below 2.5V - unlike the 24AA32A variant, which supports down to 1.7V. This makes the 24LC32A-E/SN suitable for 3.3V and 5V systems but incompatible with 1.8V or lower logic domains without level shifting.
Does the 24LC32A-E/SN support 400 kHz I²C communication across its full temperature range?
Yes, the 24LC32A-E/SN supports up to 400 kHz clock frequency over its entire extended temperature range (–40°C to +125°C) when VCC is 2.5V or higher. AC timing parameters including THIGH, TLOW, and TR are fully characterized and guaranteed at this speed under those conditions.
How does the WP pin function on the 24LC32A-E/SN?
The WP (Write-Protect) pin on the 24LC32A-E/SN is sampled at the Stop bit of each write command. When tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. No internal register or software command overrides this hardware lock - it provides deterministic, fail-safe protection.
What package type does the 24LC32A-E/SN use, and what are its key mechanical features?
The 24LC32A-E/SN uses an 8-lead plastic SOIC package (suffix SN), 3.90 mm body width, with gull-wing leads and JEDEC MS-012AC footprint. It has 0.65 mm pitch, 3.00 mm × 4.90 mm outline, and is compatible with standard reflow soldering profiles per IPC-J-STD-020.
Is the 24LC32A-E/SN AEC-Q100 qualified, and for which stress grades?
Yes, the 24LC32A-E/SN is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) and Grade 3 (–40°C to +85°C) stress testing. This qualification covers thermal cycling, humidity bias, ESD, and other automotive reliability requirements - confirming suitability for under-hood and chassis-mounted applications.
24LC32A-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:
- 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
24LC32A-E/SN FAQ
1.How can I place an order for 24LC32A-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32A-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 24LC32A-E/SN reliable?
The price and inventory of 24LC32A-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 24LC32A-E/SN is usually 5 days.
3.What payment methods are accepted for 24LC32A-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32A-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32A-E/SN?
24LC32A-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32A-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 24LC32A-E/SN?
For technical support, including 24LC32A-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32A-E/SN requirements.
6.How does Aetrix verify that 24LC32A-E/SN is sourced from the original manufacturer or authorized distributors?
All 24LC32A-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 24LC32A-E/SN meets industry standards.
7.What is the process for return or replacement of 24LC32A-E/SN?
All 24LC32A-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32A-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 24LC32A-E/SN part is unused and in its original packaging.
Return procedure for 24LC32A-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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