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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 24LC32AT-E/SN

Name: 24LC32AT-E/SN
Brand: Microchip Technology
SKU: 24LC32AT-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 24LC32AT-E/SN

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 24LC32AT-E/SN.pdf

Description:: IC EEPROM 32KBIT I2C 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:5,377

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Product details

Overview

24LC32AT-E/SN from Microchip Technology 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 at V_CC ≥ 2.5V, delivers ≤1 µA standby current, and guarantees >1 million erase/write cycles with >200 years data retention. It is used in industrial sensor calibration storage and embedded system configuration backup.

For engineers reviewing the 24LC32AT-E/SN datasheet, 24LC32AT-E/SN pinout, 24LC32AT-E/SN application, or 24LC32AT-E/SN equivalent, key selection considerations include its extended temperature range (–40°C to +125°C), SOIC-8 package compatibility, I²C bus noise immunity via Schmitt-trigger inputs, and page-write timing of ≤5 ms.

Technical Context

The 24LC32AT-E/SN implements a two-wire I²C interface with fixed 4-bit control code (1010b) and 3-bit chip address (A2–A0), enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and wraps from address FFFh to 000h.

Write protection is controlled solely by the WP pin: tied to V_CC, it inhibits all writes while permitting reads; tied to V_SS, full read/write access is enabled. The device uses an internal charge pump for EEPROM programming and requires no external high-voltage supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	32 Kbit (4,096 × 8-bit), single-block organization for simplified addressing
V_CC Range	2.5V to 5.5V - compatible with 3.3V and 5V systems without level shifting
Max Clock Frequency	400 kHz at V_CC ≥ 2.5V - enables fast configuration loading in real-time systems
Page Write Buffer	32 bytes - reduces I²C transaction count for bulk parameter updates
Write Cycle Time	≤5 ms per byte or page - defines minimum inter-write delay in firmware timing loops
Data Retention	>200 years at +25°C - ensures long-term reliability in unattended equipment
Endurance	1,000,000 erase/write cycles - supports frequent recalibration in test instrumentation

Pinout & Package

24LC32AT-E/SN is supplied in an 8-lead SOIC (SN) package measuring 3.90 mm × 4.90 mm × 1.75 mm, with gull-wing leads and JEDEC MS-012AC standard footprint.

Pin	Circuit Role	Design Meaning
A0	Chip Address Input	LSB of 3-bit device address; hardwired to V_SS or V_CC 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 24LC32AT-E/SN devices share SDA/SCL lines
A2	Chip Address Input	MSB of device address; enables contiguous 256-Kbit expansion across eight devices
V_SS	Ground Reference	Return path for all internal logic and I/O; must be low-impedance connection to system ground plane
SDA	Serial Data I/O	Open-drain bidirectional line requiring external pull-up (2 kΩ @ 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: logic high disables all write operations but allows unlimited reads - critical for field firmware safety
V_CC	Power Supply	Primary power input (2.5–5.5V); powers EEPROM array, interface logic, and internal HV generator

Key Features

Feature	Design Value
Schmitt-trigger inputs on SDA/SCL	Eliminates false triggering from EMI or slow-rising signals in noisy industrial environments
Output slope control	Reduces ground bounce and signal integrity issues during fast I²C transitions
Hardware write-protection (WP pin)	Prevents accidental overwrites during power-up/down or firmware glitches without software intervention
100 kHz / 400 kHz clock compatibility	Supports legacy 100 kHz buses and high-speed 400 kHz designs with same part number
ESD protection >4 kV	Withstands handling and board-level transients per HBM, reducing need for external TVS diodes

Applications

Industrial Sensor Calibration	Medical Device Configuration
Use Scenario: Storing factory-calibrated coefficients and sensor offset values in pressure transducers operating at –40°C to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed data integrity across thermal cycling and power loss events. Use Value: Eliminates recalibration labor and enables traceable, repeatable sensor performance over product lifetime.	Use Scenario: Holding user-adjusted therapy parameters and device serialization data in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit logs and operational settings. Use Value: Meets IEC 62304 data persistence requirements and supports remote firmware update rollback.
Automotive Body Control Module	Smart Energy Metering
Use Scenario: Saving seat/mirror position presets and lighting profiles in AEC-Q100 qualified body controllers. IC Role / Device Role / Timing Role: Extended-temperature EEPROM interfacing directly with CAN/LIN microcontrollers via I²C. Use Value: Enables personalized user experience without adding MCU flash wear or requiring external voltage supervisors.	Use Scenario: Recording tariff schedules, meter calibration constants, and tamper-event timestamps in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: High-endurance nonvolatile storage synchronized to metrology IC interrupts. Use Value: Survives >1M utility billing cycles and maintains regulatory compliance under brownout conditions.

Industrial Sensor Calibration

Medical Device Configuration

Use Scenario: Storing factory-calibrated coefficients and sensor offset values in pressure transducers operating at –40°C to +125°C.

IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed data integrity across thermal cycling and power loss events.

Use Value: Eliminates recalibration labor and enables traceable, repeatable sensor performance over product lifetime.

Use Scenario: Holding user-adjusted therapy parameters and device serialization data in portable infusion pumps.

IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit logs and operational settings.

Use Value: Meets IEC 62304 data persistence requirements and supports remote firmware update rollback.

Automotive Body Control Module

Smart Energy Metering

Use Scenario: Saving seat/mirror position presets and lighting profiles in AEC-Q100 qualified body controllers.

IC Role / Device Role / Timing Role: Extended-temperature EEPROM interfacing directly with CAN/LIN microcontrollers via I²C.

Use Value: Enables personalized user experience without adding MCU flash wear or requiring external voltage supervisors.

Use Scenario: Recording tariff schedules, meter calibration constants, and tamper-event timestamps in ANSI C12.20-compliant meters.

IC Role / Device Role / Timing Role: High-endurance nonvolatile storage synchronized to metrology IC interrupts.

Use Value: Survives >1M utility billing cycles and maintains regulatory compliance under brownout conditions.

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/SN	Same silicon, industrial temp range (–40°C to +85°C) only; identical pinout, timing, and electrical specs	Lacks extended temperature qualification; unsuitable for under-hood or high-ambient deployments	Select when cost sensitivity outweighs extended temperature requirement and ambient stays ≤85°C
AT24C32D-SSHM-T	32-Kbit I²C EEPROM with 1.7–5.5V V_CC, 1 MHz max clock, and 1.8V logic compatibility	Broader voltage range enables direct use with 1.8V MCUs; not AEC-Q100 qualified	Choose for low-voltage portable designs where automotive qualification is unnecessary

Compared with 24LC32AT-E/SN, the 24LC32A-I/SN offers identical functionality at lower cost but sacrifices extended temperature support, while the AT24C32D-SSHM-T adds 1.8V operation and higher speed but lacks automotive qualification and has different endurance spec (400k cycles).

Availability

24LC32AT-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC32AT-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC32A family was designed for reliable, low-power nonvolatile data storage in space-constrained embedded systems requiring I²C interface simplicity and extended temperature resilience.

FAQ

What is the maximum I²C clock frequency supported by the 24LC32AT-E/SN?

The 24LC32AT-E/SN supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability ensures interoperability with both legacy and high-performance I²C masters without changing the 24LC32AT-E/SN part number.

Does the 24LC32AT-E/SN require an external high-voltage supply for write operations?

No, the 24LC32AT-E/SN integrates an on-chip charge pump that generates the required programming voltage internally. No external high-voltage supply or external components are needed - write operations execute automatically upon receipt of a valid I²C write command and Stop condition.

How does the WP pin function on the 24LC32AT-E/SN?

The WP (Write-Protect) pin on the 24LC32AT-E/SN is active-high: when tied to V_CC, all write operations (byte and page) are inhibited while read operations remain fully functional. When tied to V_SS, full read/write access is enabled. WP is sampled at the Stop bit of each write command.

Can multiple 24LC32AT-E/SN devices share the same I²C bus?

Yes - the 24LC32AT-E/SN supports up to eight devices on one I²C bus using the A0, A1, and A2 address pins. Each combination of logic levels on these pins sets a unique 3-bit chip address, allowing individual addressing within the base 1010xxxx client address format.

What is the page write buffer size of the 24LC32AT-E/SN?

The 24LC32AT-E/SN features a 32-byte page write buffer. This allows up to 32 bytes of data to be loaded into the buffer before initiating the internal write cycle, reducing I²C transaction overhead and improving bulk write efficiency compared to byte-wise writes.

24LC32AT-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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 ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

24LC32AT-E/SN FAQ

1.How can I place an order for 24LC32AT-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for 24LC32AT-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 24LC32AT-E/SN reliable?

The price and inventory of 24LC32AT-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 24LC32AT-E/SN is usually 5 days.

3.What payment methods are accepted for 24LC32AT-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-E/SN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 24LC32AT-E/SN?

24LC32AT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 24LC32AT-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 24LC32AT-E/SN?

For technical support, including 24LC32AT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-E/SN requirements.

6.How does Aetrix verify that 24LC32AT-E/SN is sourced from the original manufacturer or authorized distributors?

All 24LC32AT-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 24LC32AT-E/SN meets industry standards.

7.What is the process for return or replacement of 24LC32AT-E/SN?

All 24LC32AT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-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 24LC32AT-E/SN part is unused and in its original packaging.

Return procedure for 24LC32AT-E/SN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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