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Microchip Technology 24LC32AX-E/ST
- Part No.:
- 24LC32AX-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC32AX-E/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,855
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Product details
Overview
24LC32AX-E/ST 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 400 kHz max clock (≥2.5V), 1 μA standby current (I-temp), and hardware write-protection via WP pin. It supports page writes up to 32 bytes and is used in industrial control modules for nonvolatile parameter storage.
For engineers reviewing the 24LC32AX-E/ST datasheet, 24LC32AX-E/ST pinout, 24LC32AX-E/ST application, or 24LC32AX-E/ST equivalent, key selection criteria include VCC range (2.5–5.5V), automotive-grade temperature support (–40°C to +125°C), TSSOP-8 package footprint, and I²C bus timing compliance at 400 kHz.
Technical Context
The 24LC32AX-E/ST functions as an I²C slave device with fixed 7-bit address prefix '1010' and user-configurable A2/A1/A0 bits enabling up to eight devices on one bus. Its internal address counter supports sequential reads across the full 4K-byte space with automatic rollover from address FFFh to 000h.
Write operations use self-timed internal cycles (5 ms max), supported by ACK polling for completion detection. Schmitt-trigger inputs on SDA/SCL and output slope control suppress noise and eliminate ground bounce during I²C communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4K × 8-bit) - provides sufficient nonvolatile storage for firmware configuration, calibration data, or device identity in compact embedded systems |
| VCC operating range | 2.5V to 5.5V - compatible with standard 3.3V and 5V logic rails without level shifting |
| Max I²C clock frequency | 400 kHz (≥2.5V) - enables faster parameter updates than 100 kHz legacy EEPROMs while maintaining robustness |
| Write endurance | 1,000,000 cycles - supports frequent field-updatable settings in industrial logging or telemetry applications |
| Data retention | >200 years - ensures long-term reliability of stored calibration or security keys without refresh |
| Standby current | 1 μA (max, I-temp) - minimizes power draw in battery-backed or energy-harvesting systems |
| Operating temperature | –40°C to +125°C (Automotive E-grade) - qualified for under-hood or motor-control environments |
Pinout & Package
24LC32AX-E/ST is supplied in an 8-lead TSSOP package (4.4 mm body width, JEDEC MO-153), optimized for high-density PCB layouts with thermal and mechanical reliability in automotive and industrial assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | LSB of 3-bit device address; hardwired to VSS/VCC to select one of eight possible I²C addresses on shared bus |
| A1 | Chip address input | Middle bit of device address; determines unique slave address alongside A0 and A2 |
| A2 | Chip address input | MSB of device address; enables cascading up to eight 24LC32AX-E/ST devices on single I²C bus |
| VSS | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to system ground plane |
| SDA | Serial data I/O | Open-drain bidirectional bus line requiring external pull-up resistor (2 kΩ typical for 400 kHz) |
| SCL | Serial clock input | Master-generated clock signal synchronizing all read/write transfers; Schmitt-trigger input rejects noise |
| WP | Hardware write-protect | Active-high enable: tied to VCC blocks all write/erase operations while permitting unlimited reads |
| VCC | Power supply | Single 2.5–5.5V supply powering EEPROM core, I/O buffers, and charge pump; no separate VPP required |
Key Features
| Feature | Design Value |
|---|---|
| Page write buffer (32 bytes) | Reduces I²C transaction overhead by allowing burst writes within one page boundary, improving firmware update efficiency |
| Schmitt-trigger inputs (SDA/SCL) | Provides 0.05×VCC hysteresis to reject fast transients and ensure reliable Start/Stop detection in noisy industrial environments |
| Output slope control | Controls SDA rise/fall edge rates to prevent ground bounce and meet I²C bus noise immunity requirements |
| ACK polling support | Enables deterministic write-cycle completion detection without fixed delays, maximizing I²C bus utilization |
| ESD protection >4 kV | Meets IEC 61000-4-2 Level 2 requirements for handling robustness in manufacturing and field service |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in programmable pressure or temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization via I²C; no timing-critical operation. Use Value: Enables field-replaceable sensors with persistent calibration data, eliminating reprogramming during maintenance. | Use Scenario: Retaining seat position memory, mirror angle presets, and lighting configuration across ignition cycles in vehicle door modules. IC Role / Device Role / Timing Role: I²C slave storing user preferences; accessed asynchronously during wake-up or button press events. Use Value: Supports ASIL-B adjacent functionality with automotive-grade temperature range and 1M write endurance. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding drug library definitions, dose limits, alarm thresholds, and audit log metadata in Class II medical devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter store; WP pin permanently tied to VCC during production to prevent runtime corruption. Use Value: Meets IEC 62304 software safety requirements via hardware write-lock and >200-year data retention. | Use Scenario: Storing tariff schedules, metering constants, communication credentials, and firmware patch flags in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: Low-power I²C EEPROM interfaced to metrology SoC; accessed only during configuration or firmware update windows. Use Value: 1 μA standby current extends battery life in AMI endpoints; 400 kHz interface accelerates remote firmware validation. |
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 rated only for –40°C to +85°C (industrial grade) | Lacks automotive temperature qualification; unsuitable for under-hood or engine bay deployments | Select when cost sensitivity outweighs extended temperature need and board layout allows SOIC-8 |
| BR24G32FJ-3GE2 | 32 Kbit, 1.6–5.5V, supports 1 MHz I²C, but uses different address scheme (A0 only) and lacks hardware WP pin | No dedicated write-protect pin requires software-based locking; higher speed may demand stricter bus termination | Choose for high-throughput logging where hardware WP is not mandatory and 1 MHz timing margins are verified |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AX-E/ST uniquely combines automotive temperature rating, hardware write-protection, and industry-standard 1010xxx address format-making it optimal for safety-critical or field-serviceable systems requiring guaranteed data integrity.
Availability
24LC32AX-E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump settings, and smart energy meter firmware parameters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32AX-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The 24LC32AX-E/ST belongs to Microchip's 24XX32A family of I²C serial EEPROMs, engineered specifically for robust, low-power nonvolatile storage in automotive, industrial, and medical applications demanding extended temperature operation and high reliability.
FAQ
What is the maximum I²C clock frequency supported by the 24LC32AX-E/ST?
The 24LC32AX-E/ST supports up to 400 kHz I²C clock frequency when VCC is ≥2.5V. At VCC <2.5V, maximum frequency drops to 100 kHz. This dual-speed capability ensures compatibility with both legacy 100 kHz systems and modern high-throughput designs while maintaining signal integrity across voltage ranges. The 24LC32AX-E/ST datasheet specifies AC timing parameters including THIGH, TLOW, and TSU:DAT for both conditions.
Does the 24LC32AX-E/ST require an external high-voltage programming supply?
No, the 24LC32AX-E/ST does not require an external high-voltage programming supply. It operates from a single 2.5V to 5.5V VCC rail and integrates an on-chip charge pump to generate the necessary voltages for EEPROM write/erase operations. All programming is performed using standard I²C commands-no VPP pin or external programming voltage is needed, simplifying system design and reducing BOM count.
How does the WP pin function on the 24LC32AX-E/ST?
The WP (Write-Protect) pin on the 24LC32AX-E/ST is a hardware-level enable that disables all write and erase operations when pulled high to VCC. When tied to VSS, full read/write access is granted. WP is sampled at the Stop bit of each write command, so toggling it mid-operation has no effect. This feature ensures immutable storage of critical calibration or security data in the 24LC32AX-E/ST without relying on software locks.
Can multiple 24LC32AX-E/ST devices share the same I²C bus?
Yes, up to eight 24LC32AX-E/ST devices can share a single I²C bus using the A2, A1, and A0 address pins to configure unique 3-bit chip select codes. Each device responds only to its assigned 7-bit address (1010xxx), enabling scalable memory expansion to 256 Kbits. The 24LC32AX-E/ST's open-drain SDA/SCL outputs and built-in Schmitt triggers ensure reliable multi-drop bus operation.
What package type is used for the 24LC32AX-E/ST?
The 24LC32AX-E/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 4.4 mm body width, per JEDEC MO-153 standard. This surface-mount package offers superior thermal performance and smaller footprint than PDIP or SOIC variants, making it ideal for space-constrained automotive and industrial PCBs. Pin 1 is marked with a dot or notch, and the package is lead-free (Pb-free) with matte tin finish.
24LC32AX-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
24LC32AX-E/ST FAQ
1.How can I place an order for 24LC32AX-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AX-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 24LC32AX-E/ST reliable?
The price and inventory of 24LC32AX-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 24LC32AX-E/ST is usually 5 days.
3.What payment methods are accepted for 24LC32AX-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AX-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AX-E/ST?
24LC32AX-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AX-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 24LC32AX-E/ST?
For technical support, including 24LC32AX-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AX-E/ST requirements.
6.How does Aetrix verify that 24LC32AX-E/ST is sourced from the original manufacturer or authorized distributors?
All 24LC32AX-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 24LC32AX-E/ST meets industry standards.
7.What is the process for return or replacement of 24LC32AX-E/ST?
All 24LC32AX-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AX-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 24LC32AX-E/ST part is unused and in its original packaging.
Return procedure for 24LC32AX-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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