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Microchip Technology 24LC32A-E/ST
- Part No.:
- 24LC32A-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC32A-E/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
24LC32A-E/ST from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial-extended temperature range (–40°C to +125°C). It features hardware write-protection via the WP pin, 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in automotive body control modules for storing calibration data across power cycles.
For engineers reviewing the 24LC32A-E/ST datasheet, 24LC32A-E/ST pinout, 24LC32A-E/ST application, or 24LC32A-E/ST equivalent, key selection considerations include VCC voltage compatibility (≥2.5V), extended-temperature operation, I²C bus timing compliance at 400 kHz, and hardware write-protect functionality for firmware-safe configuration storage.
Technical Context
The 24LC32A-E/ST implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses internal address pointer logic to support current-address, random, and sequential read modes. Its EEPROM array is accessed via 7-bit client addressing (1010 A2 A1 A0 R/W), where A0–A2 configure device select on shared buses.
Write operations are self-timed with maximum 5 ms byte/page erase/write cycle; acknowledge polling is supported to detect completion. The WP pin samples at the Stop bit to enable/disable writes - no effect if toggled mid-cycle. Page boundaries align to 32-byte offsets, and crossing boundaries causes wraparound within the same physical page.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit) nonvolatile EEPROM array - supports persistent storage of configuration, calibration, or fault logs without backup power. |
| VCC Range | 2.5V to 5.5V - compatible with standard 3.3V and 5V microcontroller I/O domains; excludes 1.7V–2.5V operation supported by 24AA32A variants. |
| Max Clock Frequency | 400 kHz - enables high-throughput I²C communication; reduced to 100 kHz only if VCC < 2.5V (not applicable here). |
| Page Write Buffer | 32 bytes - allows burst programming of up to one full page per Stop condition, reducing bus overhead versus byte-write mode. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in applications requiring frequent parameter updates (e.g., adaptive sensor calibration). |
| Data Retention | >200 years at +25°C - guarantees integrity of stored settings over product lifetime without refresh. |
| Temperature Range | –40°C to +125°C (Extended grade) - qualified for under-hood automotive and industrial environments with thermal cycling stress. |
Pinout & Package
24LC32A-E/ST is supplied in an 8-lead SOIC package (ST suffix), with 1.27 mm pitch, 3.9 mm body width, and JEDEC MS-012AC footprint. Pin 1 is marked with a beveled corner or dot; leads are matte tin-plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit hardware address; tied high/low to select one of eight devices on same I²C bus - required for multi-device configurations. |
| A1 | Chip Address Input | Middle bit of chip address; determines unique I²C client address when combined with A0/A2 - enables scalable system-level EEPROM expansion. |
| A2 | Chip Address Input | MSB of chip address; sets top address bit in 7-bit I²C client address (1010 A2 A1 A0 R/W) - essential for bus arbitration in multi-device systems. |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be low-impedance connection to minimize ground bounce during SDA transitions. |
| SDA | Serial Data I/O | Bidirectional open-drain line for address/data transfer; requires external pull-up (2 kΩ typical for 400 kHz); changes only during SCL low except for Start/Stop conditions. |
| SCL | Serial Clock Input | Master-generated clock synchronizing all I²C transactions; rising edge samples data, falling edge drives data - defines timing window for setup/hold compliance. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes (reads unaffected); sampled at Stop bit - prevents accidental overwrites during power transients or firmware faults. |
| VCC | Power Supply | Core supply input (2.5–5.5V); powers EEPROM array, logic, and I/O buffers; decoupling capacitor (0.1 µF ceramic) required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | 50 mV hysteresis on SDA/SCL pins - rejects sub-50 ns noise spikes and eliminates false Start/Stop detection in electrically noisy automotive or industrial environments. |
| Output slope control | Controlled SDA fall time (20+0.1CB ns) - suppresses ground bounce during high-speed switching, preventing unintended logic state corruption on shared PCB return paths. |
| Hardware write protection | WP pin directly gates internal write-enable logic - provides fail-safe, zero-software-dependency protection against firmware bugs or malicious writes during field operation. |
| Page write capability | 32-byte buffer enables single-burst writes - reduces I²C transaction count by up to 32× versus byte-write mode, improving bus efficiency and lowering host CPU overhead. |
| AEC-Q100 qualification | Qualified to Grade 1 (–40°C to +125°C) per AEC-Q100 Rev H - validates reliability for automotive powertrain, chassis, and body electronics applications. |
Applications
| Automotive Body Control Unit | Industrial PLC Configuration Storage |
|---|---|
|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced via I²C to an 8-bit MCU; retains data across ignition cycles and battery disconnects. Use Value: Enables user-customizable settings with >200-year data retention and AEC-Q100-qualified operation at 125°C ambient. |
Use Scenario: Holding I/O mapping tables and PID tuning parameters in modular programmable logic controllers. IC Role / Device Role / Timing Role: Field-updatable parameter store accessed during boot and runtime; supports 1M endurance cycles for factory recalibration. Use Value: Eliminates need for external backup batteries or supercapacitors while supporting frequent reconfiguration in harsh industrial environments. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Settings |
|
Use Scenario: Recording flow-rate calibration coefficients and safety thresholds updated during service technician maintenance. IC Role / Device Role / Timing Role: Secure, write-protected memory accessed via isolated I²C; WP pin hardwired to VCC during normal operation. Use Value: Prevents unauthorized or accidental modification of critical dosing parameters, meeting IEC 62304 software safety requirements. |
Use Scenario: Storing tariff schedules, meter ID, and cryptographic keys in utility-grade electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Tamper-resistant configuration storage with extended-temperature operation and ESD protection >4 kV. Use Value: Ensures regulatory-compliant data integrity over 10+ year field life despite thermal cycling, humidity, and EMI exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32A-I/ST | Industrial grade (–40°C to +85°C) vs. Extended grade (–40°C to +125°C); identical electrical specs and pinout. | Not qualified for under-hood or high-ambient industrial enclosures requiring >85°C operation. | Select 24LC32A-I/ST only if ambient temperature remains ≤85°C; otherwise 24LC32A-E/ST is mandatory for thermal compliance. |
| AT24C32D-SSHM-T | Same 32-Kbit I²C EEPROM but with 1.7–5.5V VCC range and AEC-Q100 Grade 2 (–40°C to +105°C); different pinout (SOIC-8, same footprint). | Lacks extended-temperature rating; not validated for 125°C continuous operation. | Use AT24C32D-SSHM-T only when wider VCC range (1.7V) is needed; 24LC32A-E/ST remains preferred for 125°C automotive use cases. |
Compared with 24LC32A-I/ST and AT24C32D-SSHM-T, the 24LC32A-E/ST uniquely delivers guaranteed operation up to +125°C with AEC-Q100 Grade 1 qualification - making it the sole choice for engine bay, transmission control, or high-heat industrial controller applications requiring full-spec EEPROM reliability.
Availability
24LC32A-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC32A-E/ST 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, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.
The 24LC32A belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile data storage in space-constrained and thermally demanding embedded systems.
FAQ
What is the minimum VCC voltage required for reliable operation of the 24LC32A-E/ST?
The 24LC32A-E/ST requires a minimum VCC of 2.5V for full specification compliance, including 400 kHz I²C operation and extended-temperature functionality. Operation below 2.5V is not guaranteed and may result in timing violations or write failures. This differs from the 24AA32A variant, which supports down to 1.7V.
Does the 24LC32A-E/ST support page write operations, and what is the maximum buffer size?
Yes, the 24LC32A-E/ST supports page write operations with a 32-byte buffer. Up to 32 bytes can be loaded into the on-chip latch before issuing a Stop condition to initiate the internal write cycle. Attempting to write more than 32 bytes without a Stop will cause address wraparound within the same physical page.
How does the WP pin function on the 24LC32A-E/ST, and when is it sampled?
The WP pin on the 24LC32A-E/ST is sampled at the Stop bit of each write command. When tied to VCC, all write operations (byte and page) are inhibited while reads remain fully functional. Toggling WP after the Stop bit has no effect on an ongoing write cycle - protection is latched at command termination.
Is the 24LC32A-E/ST pin-compatible with other packages in the 24XX32A family?
Yes, the 24LC32A-E/ST in SOIC-8 (ST package) shares identical pinout and signal mapping with all other 8-lead packages in the 24XX32A family (e.g., MSOP, TSSOP, PDIP), including A0–A2, VSS, SDA, SCL, WP, and VCC assignments. Only the SOT-23 variant omits address pins.
What is the endurance rating of the 24LC32A-E/ST, and how is it specified?
The 24LC32A-E/ST is rated for 1,000,000 erase/write cycles per page, tested at +25°C and 5.5V. Endurance is specified per page (32 bytes), not per byte, because page write operations refresh the entire 32-byte block - meaning frequent partial-page writes still consume full-page endurance budget.
24LC32A-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
24LC32A-E/ST FAQ
1.How can I place an order for 24LC32A-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32A-E/ST 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/ST reliable?
The price and inventory of 24LC32A-E/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 24LC32A-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32A-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32A-E/ST?
24LC32A-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32A-E/ST 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/ST?
For technical support, including 24LC32A-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32A-E/ST requirements.
6.How does Aetrix verify that 24LC32A-E/ST is sourced from the original manufacturer or authorized distributors?
All 24LC32A-E/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 24LC32A-E/ST?
All 24LC32A-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32A-E/ST, 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/ST part is unused and in its original packaging.
Return procedure for 24LC32A-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32A-E/ST 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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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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