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Microchip Technology 24LC32A/SN
- Part No.:
- 24LC32A/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC32A/SN.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
24LC32A from Microchip Technology Inc. is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory with hardware write-protection, 32-byte page buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency (100 kHz below 2.5V), delivers ≤1 µA standby current, and guarantees >1 million erase/write cycles with >200 years data retention. It is used for nonvolatile parameter storage in industrial sensor nodes and embedded control modules.
For engineers reviewing the 24LC32A datasheet, 24LC32A pinout, 24LC32A application, or 24LC32A equivalent, this page provides verified electrical specifications, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The 24LC32A 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 page-write logic buffers up to 32 bytes before initiating self-timed erase/write cycles.
Hardware write protection is controlled by the WP pin: tied to VCC disables all writes but permits reads; tied to VSS enables full read/write access. Device addressing uses three chip-select bits (A0–A2), allowing up to eight devices on one bus - though the SN package (SOIC-8) supports all three pins, unlike SOT-23 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware calibration tables or device configuration profiles |
| VCC Range | 2.5V to 5.5V - requires no level-shifting when interfacing with 3.3V or 5V microcontrollers |
| Max Clock Frequency | 400 kHz at VCC ≥2.5V; 100 kHz at lower voltages - sets maximum I²C throughput for parameter updates |
| Page Write Buffer | 32-byte buffer - reduces host CPU overhead during bulk configuration writes and minimizes write-cycle time per byte |
| Write Cycle Time | ≤5 ms per byte or page - defines minimum interval between successive write commands in time-critical logging |
| Endurance | 1,000,000 erase/write cycles - supports daily reconfiguration over 27+ years in field-deployed equipment |
| Data Retention | >200 years at +25°C - ensures long-term reliability of stored calibration or security keys without refresh |
| ESD Protection | >4,000 V HBM - withstands handling and board-level ESD events without latch-up or parametric shift |
Pinout & Package
24LC32A/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm body width, with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or notch.
| 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 alongside A0 and A2 for multi-device configurations |
| A2 | Chip Address Input | MSB of device address; required for expanding contiguous address space across multiple 24LC32A units |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be low-impedance connection to system GND plane |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ for 400 kHz); carries address, command, and data |
| SCL | Serial Clock Input | Master-generated clock synchronizing all I²C transfers; rising edge samples SDA, falling edge drives SDA |
| WP | Write-Protect Control | Active-high enable: tied to VCC blocks all write operations while permitting unlimited reads - critical for field firmware safety |
| VCC | Power Supply | 2.5V–5.5V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Two-Wire Serial Interface | I²C-compatible with 100/400 kHz modes - eliminates need for dedicated SPI or parallel buses, reducing MCU pin count and PCB routing complexity |
| Schmitt Trigger Inputs | Input hysteresis ≥0.05×VCC on SDA/SCL - rejects sub-50 ns noise spikes common in industrial environments without external filtering |
| Self-Timed Write Cycle | No external timing components required - internal oscillator manages erase/write duration, simplifying host firmware design |
| Hardware Write Protection | WP pin directly gates write logic - prevents accidental overwrites during power transitions or software faults without software intervention |
| Page Write Buffer | 32-byte internal latch - allows burst writes up to full page size, cutting total programming time by ~90% vs. byte-by-byte writes |
| AEC-Q100 Qualified | Qualified for automotive Grade 2 (-40°C to +105°C) and extended temperature range (-40°C to +125°C) - validated for under-hood and ADAS applications |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during power-up initialization; retains values across cold starts and brownouts. Use Value: Eliminates need for external calibration hardware; enables field recalibration via I²C without firmware update or physical access. |
Use Scenario: Holding user-configurable therapy parameters (e.g., dosage limits, alarm thresholds) in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for regulatory-compliant settings; WP pin prevents runtime corruption during battery swaps. Use Value: Meets IEC 62304 Class B software requirements for persistent configuration integrity and audit trail support. |
| Automotive Body Control Module | Smart Energy Metering |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior in vehicle BCMs operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 qualified EEPROM storing user preferences and fault logs; survives repeated thermal cycling and vibration. Use Value: Enables personalized vehicle experience without relying on volatile RAM or higher-cost FRAM/NVRAM alternatives. |
Use Scenario: Recording tariff schedules, demand-response event timestamps, and meter firmware version history in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: High-endurance data logger for time-stamped utility events; endurance rating supports daily writes for 27+ years. Use Value: Provides verifiable, long-life audit trail for regulatory compliance and remote diagnostics without cloud dependency. |
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 (Microchip) | Same 32-Kbit capacity, 1.7–5.5V VCC range, and 400 kHz speed; includes enhanced ESD (>6 kV HBM) and improved data retention at high temperature | Supports wider voltage range and higher reliability in battery-powered or wide-temperature IoT sensors where 2.5V minimum is limiting | Select AT24C32D if operating below 2.5V or requiring extended data retention at +125°C ambient |
| BR24G32FJ-3GE2 (ROHM) | 32-Kbit I²C EEPROM with 1.7–5.5V operation, 1 MHz max clock, and built-in error correction code (ECC) for single-bit error detection/correction | Provides ECC-based data integrity assurance not present in 24LC32A - suitable for safety-critical medical or aerospace systems requiring FIT-rate reporting | Choose BR24G32FJ for applications demanding certified data integrity beyond basic write-cycle reliability |
Compared with 24LC32A, AT24C32D offers broader voltage compatibility and superior high-temperature retention, while BR24G32FJ adds ECC-based data integrity - both require no PCB changes but differ in qualification scope and fault-handling capability.
Availability
24LC32A is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32A 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 manufacturer specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The 24LC32A belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage and robust I²C interoperability.
FAQ
What is the minimum operating voltage for the 24LC32A?
The 24LC32A requires a minimum VCC of 2.5V, unlike the 24AA32A variant which operates down to 1.7V. This is explicitly defined in the Device Selection Table and Electrical Characteristics section of the DS20001713P datasheet. Operating below 2.5V may result in undefined behavior or failure to acknowledge I²C commands.
Does the 24LC32A/SN support page write operations?
Yes, the 24LC32A/SN supports page write operations with a 32-byte buffer. When a Start condition is followed by a valid address and data stream (up to 32 bytes), the device stores them in the buffer and initiates a self-timed write cycle only upon receiving the Stop condition - reducing host overhead and total programming time significantly compared to byte writes.
How does the WP pin function on the 24LC32A?
The WP (Write-Protect) pin on the 24LC32A is active-high: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. The pin is sampled at the Stop bit of each write command, so toggling WP mid-cycle has no effect - ensuring deterministic protection during power transitions or firmware errors.
What temperature ranges are supported by the 24LC32A/SN?
The 24LC32A/SN is qualified for Industrial (I) range: –40°C to +85°C, and Extended (E) range: –40°C to +125°C. These ratings are confirmed in the Device Selection Table and Electrical Characteristics section. The SN package (SOIC-8) is available in both grades, with marking codes indicating temperature grade (e.g., "I" or "E" suffix).
Is the 24LC32A AEC-Q100 qualified?
Yes, the 24LC32A is AEC-Q100 qualified - explicitly stated in the Features section of DS20001713P. It meets Grade 2 stress test requirements for automotive applications, supporting operation from –40°C to +105°C (Grade 2) and extended testing up to +125°C (Grade 1), making it suitable for body control, infotainment, and ADAS subsystems.
24LC32A/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC32A/SN FAQ
1.How can I place an order for 24LC32A/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32A/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/SN reliable?
The price and inventory of 24LC32A/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/SN is usually 5 days.
3.What payment methods are accepted for 24LC32A/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32A/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32A/SN?
24LC32A/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32A/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/SN?
For technical support, including 24LC32A/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32A/SN requirements.
6.How does Aetrix verify that 24LC32A/SN is sourced from the original manufacturer or authorized distributors?
All 24LC32A/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/SN meets industry standards.
7.What is the process for return or replacement of 24LC32A/SN?
All 24LC32A/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32A/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/SN part is unused and in its original packaging.
Return procedure for 24LC32A/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32A/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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