My Inquiry
My Account
Microchip Technology 24LC32AT-E/SM
- Part No.:
- 24LC32AT-E/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24LC32AT-E/SM.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
24LC32AT-E/SM from Microchip Technology 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, 5 ms max page write time, and industrial-extended temperature range (–40°C to +125°C). It delivers 1 µA standby current, hardware write-protection via WP pin, and supports up to eight devices on one bus using A0–A2 address inputs.
For engineers reviewing the 24LC32AT-E/SM datasheet, 24LC32AT-E/SM pinout, 24LC32AT-E/SM application, or 24LC32AT-E/SM equivalent, this device serves as a low-power, high-reliability nonvolatile memory for firmware storage, calibration data retention, and configuration parameter backup in automotive control units, industrial sensors, and embedded power management systems.
Technical Context
The 24LC32AT-E/SM implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 32-byte page write buffer, self-timed erase/write cycle, and an address pointer that auto-increments during sequential reads.
It uses standard I²C protocol with Start/Stop conditions, ACK polling for write-cycle completion detection, and supports byte-write and page-write modes. The WP pin enables hardware-level write protection of the full 32-Kbit array, sampled at the Stop bit of each write command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware patches or sensor calibration tables in compact embedded systems. |
| VCC range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains without level shifting. |
| Max clock frequency | 400 kHz - supports fast configuration loading while maintaining robustness on noisy industrial buses. |
| Page write time | ≤5 ms - limits worst-case system latency during nonvolatile parameter updates. |
| Endurance | 1 million erase/write cycles - ensures long-term reliability in field-updatable applications like energy metering. |
| Data retention | >200 years at +25°C - guarantees integrity of stored calibration or security keys over product lifetime. |
| Temperature range | –40°C to +125°C (Extended grade) - qualified for under-hood automotive and industrial motor control environments. |
Pinout & Package
24LC32AT-E/SM is supplied in an 8-lead MSOP package (3 mm × 3 mm body, 0.65 mm pitch), marked "4L32AT" and "I/SM", with exposed pad optional for thermal relief or grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | Hardwired logic level sets LSB of 7-bit I²C client address (1010A2A1A0); enables multi-device bus addressing. |
| A1 | Chip address input | Second bit of 3-bit chip select; allows up to eight 24LC32AT-E/SM devices on same I²C bus. |
| A2 | Chip address input | MSB of chip select; combined with A0/A1, defines unique I²C address within 1010xxx range. |
| VSS | Ground reference | Return path for all internal circuitry; must be connected to system GND for stable operation. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; carries I²C addresses, commands, and data. |
| SCL | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-triggered for noise immunity. |
| WP | Write-protect control | Logic-high disables all writes (read-only mode); sampled at Stop bit - no effect if toggled mid-cycle. |
| VCC | Power supply | Primary supply rail (2.5–5.5V); powers EEPROM core, interface logic, and internal charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs (SDA/SCL) | 0.05 VCC hysteresis - rejects EMI-induced glitches on noisy factory floors or automotive harnesses. |
| Output slope control | Controlled rise/fall times - eliminates ground bounce and reduces radiated emissions in dense PCB layouts. |
| 32-byte page write buffer | Reduces I²C transaction overhead by up to 32× vs. byte-write; accelerates bulk configuration writes. |
| Hardware write-protection (WP) | Prevents accidental or malicious firmware corruption during power-up/down or brown-out events. |
| AEC-Q100 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment modules. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Temperature Sensor Node |
|---|---|
|
Use Scenario: Storing fuel map coefficients, idle air control parameters, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced via I²C to MCU; retains data during vehicle shutdown. Use Value: Enables adaptive learning and regulatory-compliant OBD-II logging without external backup battery or capacitor. |
Use Scenario: Retaining calibrated offset/gain values and sensor linearization tables for RTD or thermistor-based measurement circuits. IC Role / Device Role / Timing Role: Calibration data repository accessed at startup; immune to power interruption during field deployment. Use Value: Eliminates manual recalibration after replacement; maintains ±0.1°C accuracy over 10+ years of field operation. |
| Smart Energy Meter | Medical Infusion Pump Controller |
|
Use Scenario: Recording tariff schedules, billing cycle counters, tamper-event timestamps, and cryptographic keys for secure firmware updates. IC Role / Device Role / Timing Role: Secure, endurance-rated memory for compliance-critical data; accessed only during meter initialization or update windows. Use Value: Meets ANSI C12.22 and IEC 62056 requirements for 200-year data retention and 1M-cycle write endurance. |
Use Scenario: Storing drug library profiles, dose limit presets, user audit logs, and safety-critical alarm thresholds in Class II medical devices. IC Role / Device Role / Timing Role: Fail-safe configuration store with hardware write-lock; prevents runtime modification of life-critical parameters. Use Value: Supports FDA 21 CFR Part 11 compliance through immutable parameter storage and traceable revision history. |
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 die, 8-lead PDIP package; higher profile (3.3 mm height), no exposed pad; 0.1" lead pitch. | Preferred for through-hole prototyping or legacy board rework where MSOP footprint unavailable. | Select when mechanical compatibility with DIP sockets or wave-solder assembly is required. |
| AT24C32D-SSHM-T | 32-Kbit I²C EEPROM from Microchip (acquired Atmel); 1.7–5.5V VCC, –40°C to +85°C, SOIC-8 package. | Lacks extended temperature rating and AEC-Q100 qualification; suitable for commercial-grade consumer electronics. | Choose for cost-sensitive, non-automotive designs where industrial temp range is not mandatory. |
Compared with 24LC32AT-E/SM, the 24LC32A-I/SN offers identical electrical behavior but different mechanical integration, while the AT24C32D-SSHM-T trades extended temperature and automotive qualification for broader voltage operation and lower cost in non-critical applications.
Availability
24LC32AT-E/SM is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC32AT-E/SM 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 specifically for reliable, low-power nonvolatile data storage in automotive, industrial, and medical systems where extended temperature operation and AEC-Q100 compliance are essential.
FAQ
What is the maximum I²C clock frequency supported by the 24LC32AT-E/SM?
The 24LC32AT-E/SM supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. Below 2.5V, maximum clock rate drops to 100 kHz. This dual-speed capability ensures interoperability with both legacy 100 kHz controllers and modern high-speed I²C masters while maintaining signal integrity.
Does the 24LC32AT-E/SM require external pull-up resistors on SDA and SCL lines?
Yes, the 24LC32AT-E/SM has open-drain SDA and SCL pins and requires external pull-up resistors. Typical values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz. Pull-up voltage must match the host controller's logic level (e.g., 3.3V or 5V) to ensure proper I²C signaling margins.
How does hardware write-protection work on the 24LC32AT-E/SM?
The WP pin on the 24LC32AT-E/SM disables all write operations when tied to VCC. Write commands are acknowledged but ignored; read operations remain fully functional. Protection is sampled at the Stop bit of each write command, making it effective even during partial bus transactions.
Can multiple 24LC32AT-E/SM devices share the same I²C bus?
Yes, up to eight 24LC32AT-E/SM devices can operate on a single I²C bus using unique 3-bit chip addresses set by A0, A1, and A2 pins. Each device responds only to its assigned 7-bit address (1010A2A1A0), enabling scalable memory expansion up to 256 Kbits.
What is the page write buffer size of the 24LC32AT-E/SM?
The 24LC32AT-E/SM features a 32-byte page write buffer, allowing up to 32 bytes to be written in a single I²C transaction. This reduces bus overhead and improves efficiency compared to byte-wise writes, especially when updating configuration blocks or calibration data sets.
24LC32AT-E/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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-SOIJ
24LC32AT-E/SM FAQ
1.How can I place an order for 24LC32AT-E/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AT-E/SM 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/SM reliable?
The price and inventory of 24LC32AT-E/SM 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/SM is usually 5 days.
3.What payment methods are accepted for 24LC32AT-E/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-E/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AT-E/SM?
24LC32AT-E/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AT-E/SM 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/SM?
For technical support, including 24LC32AT-E/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-E/SM requirements.
6.How does Aetrix verify that 24LC32AT-E/SM is sourced from the original manufacturer or authorized distributors?
All 24LC32AT-E/SM 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/SM meets industry standards.
7.What is the process for return or replacement of 24LC32AT-E/SM?
All 24LC32AT-E/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-E/SM, 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/SM part is unused and in its original packaging.
Return procedure for 24LC32AT-E/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32AT-E/SM 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
