My Inquiry
My Account
Microchip Technology 24LC32AT-I/OT
- Part No.:
- 24LC32AT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SC-74A, SOT-753
- Datasheet:
-
24LC32AT-I/OT.pdf
- Description:
- IC EEPROM 32KBIT I2C SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:34,156
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
24LC32AT-I/OT 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 industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protection via WP pin. It supports page writes up to 32 bytes and delivers 1 µA standby current for low-power embedded systems.
For engineers reviewing the 24LC32AT-I/OT datasheet, 24LC32AT-I/OT pinout, 24LC32AT-I/OT application, or 24LC32AT-I/OT equivalent, key selection considerations include its 8-lead SOT-23 package, I²C bus compatibility, page write buffer size, write-protection behavior, and endurance specification of 1 million erase/write cycles.
Technical Context
The 24LC32AT-I/OT 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 acknowledge polling allows host synchronization during self-timed 5 ms write cycles.
Unlike larger EEPROM families, this variant uses fixed device addressing in SOT-23 packaging - A0/A1/A2 pins are not bonded out, so only one device can reside per I²C bus segment. Write protection is controlled solely by the WP pin state at the Stop bit, and no internal address bits are mapped to chip-select lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit) nonvolatile storage, sufficient for firmware configuration, calibration data, or device identity storage in space-constrained designs. |
| VCC Range | 2.5V to 5.5V - compatible with standard 3.3V and 5V logic domains; excludes sub-2.5V operation unlike 24AA32A variants. |
| Max Clock Frequency | 400 kHz - enables faster byte/page transfers than legacy 100 kHz I²C, reducing bus occupancy time in real-time systems. |
| Page Write Buffer | 32-byte buffer - allows efficient bulk writes without host intervention between bytes; reduces total transaction overhead by ~31× vs. byte-write mode. |
| Write Cycle Time | 5 ms maximum - defines minimum inter-write interval; impacts system responsiveness during configuration updates or logging operations. |
| Endurance | 1,000,000 erase/write cycles - supports frequent parameter updates in industrial controllers or metering applications over multi-year lifetimes. |
| Data Retention | 200 years at +25°C - ensures long-term integrity of stored calibration coefficients or security keys without refresh mechanisms. |
Pinout & Package
24LC32AT-I/OT is supplied in an 5-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for high-density PCB layouts. Chip address inputs A0/A1/A2 are not available in this variant - only one device can be placed per I²C bus segment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WP) | Write-Protect Input | Logic-high disables all write operations (including page writes); sampled at Stop bit - toggling during write cycle has no effect. |
| 2 (VCC) | Power Supply | Accepts 2.5V–5.5V; must be decoupled with ≥0.1 µF ceramic capacitor near pin to stabilize I²C timing during write cycles. |
| 3 (SCL) | Serial Clock Input | Open-drain compatible; requires external pull-up resistor (2 kΩ typical for 400 kHz); synchronizes all data transfers. |
| 4 (VSS) | Ground Reference | Return path for VCC and I/O; must be connected to system ground plane with low-inductance trace to minimize noise coupling into SDA/SCL. |
| 5 (SDA) | Serial Data I/O | Bidirectional open-drain line; shares pull-up with SCL; changes only during SCL low - violations trigger Start/Stop conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | 0.05 VCC hysteresis on SDA/SCL - rejects noise spikes ≤50 ns and enables reliable operation in electrically noisy industrial environments. |
| Output slope control | Controlled rise/fall times prevent ground bounce during SDA transitions - eliminates false ACK/NACK detection in multi-drop I²C buses. |
| Hardware write-protection | WP pin directly gates internal write logic - provides tamper-resistant configuration locking without software overhead or firmware vulnerability. |
| I²C bus compatibility | Fully compliant with Philips I²C-bus specification (100/400 kHz modes) - interoperable with standard microcontroller peripherals and Linux kernel drivers. |
| Low-power operation | 1 µA standby current at VCC = 5.5V - extends battery life in portable instrumentation or wireless sensor nodes between configuration updates. |
Applications
| Industrial Sensor Node | Smart Meter Calibration Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in a battery-powered environmental monitor. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and periodic self-test; retains values across 10+ year deployments. Use Value: Eliminates need for external calibration hardware; enables field recalibration via I²C without firmware update - supported by 1M-cycle endurance and 200-year data retention. |
Use Scenario: Holding utility-specific tariff schedules, meter ID, and cryptographic keys in a Class 0.5 electricity meter with anti-tampering requirements. IC Role / Device Role / Timing Role: Secure parameter vault; WP pin tied to tamper-detection circuit to lock memory during physical intrusion attempts. Use Value: Hardware-enforced write-disable prevents unauthorized firmware or billing parameter modification - meets IEC 62055-41 security requirements. |
| Embedded Controller Configuration | Automotive Body Control Module |
|
Use Scenario: Storing user-defined I/O mapping, communication protocol settings, and alarm thresholds in a programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: System configuration database; accessed at boot and updated via HMI or remote diagnostics interface. Use Value: 32-byte page writes reduce configuration save time to <16 ms (vs. >500 ms for byte writes), minimizing system downtime during parameter changes. |
Use Scenario: Recording seat position memory, mirror angle presets, and lighting profiles in a vehicle body control unit (BCU) meeting AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory; operates reliably across –40°C to +85°C ambient with 2.5V–5.5V supply tolerance. Use Value: Qualified to AEC-Q100 Rev G - validated for thermal cycling, vibration, and ESD (>4 kV HBM), enabling drop-in use in automotive production without additional qualification. |
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 | 8-lead SOIC package; includes A0/A1/A2 address pins - supports up to eight devices on same I²C bus. | Used where board space permits larger package and multi-device addressing is required for modular design. | Select when bus scalability matters more than footprint; requires PCB layout change and pull-up resistor adjustment for SOIC pinout. |
| AT24C32D-SSHM-T | 32-Kbit I²C EEPROM from Microchip (formerly Atmel); identical 2.5V–5.5V range and 400 kHz speed but different SOT-23 marking and RoHS compliance documentation. | Preferred in designs requiring dual-sourcing or legacy Atmel ecosystem alignment. | Drop-in functional replacement; verify WP pin behavior and endurance spec match under same test conditions before migration. |
Compared with 24LC32AT-I/OT, the 24LC32A-I/SN adds address pin flexibility at the cost of board area, while AT24C32D-SSHM-T offers second-source assurance with identical electrical behavior - both require validation of WP timing and page boundary handling in existing firmware.
Availability
24LC32AT-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter calibration storage, embedded controller configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 24LC32AT-I/OT 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The 24LC32A family was designed for robust, low-power nonvolatile data storage in resource-constrained embedded systems - targeting applications where firmware resilience, long-term data integrity, and I²C bus simplicity are critical.
FAQ
What is the operating voltage range for the 24LC32AT-I/OT?
The 24LC32AT-I/OT operates from 2.5V to 5.5V DC. Unlike the 24AA32A variant, it does not support voltages below 2.5V - attempting to power it below this threshold will result in undefined behavior or failure to respond on the I²C bus. This range aligns with standard 3.3V and 5V logic systems.
Does the 24LC32AT-I/OT support multiple devices on the same I²C bus?
No - the 24LC32AT-I/OT uses the 5-lead SOT-23 package, where A0, A1, and A2 address pins are not bonded out. As confirmed in the datasheet's Pin Descriptions section, only one 24LC32AT-I/OT can reside per I²C bus segment. For multi-device configurations, select the SOIC or MSOP variants like 24LC32A-I/SN.
How does write protection work on the 24LC32AT-I/OT?
Write protection on the 24LC32AT-I/OT is controlled exclusively by the WP pin: tying WP to VCC disables all write operations (byte and page), while tying it to VSS enables them. The pin is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect, and read operations remain fully functional regardless of WP state.
What is the maximum page write size for the 24LC32AT-I/OT?
The 24LC32AT-I/OT supports a 32-byte page write buffer. When initiating a page write, the host may transmit up to 32 consecutive bytes after the address; the device stores them in the buffer and commits all at once upon receiving the Stop condition. Exceeding 32 bytes causes wraparound within the same page, overwriting earlier data.
Is the 24LC32AT-I/OT qualified for automotive applications?
Yes - the 24LC32AT-I/OT is AEC-Q100 qualified (Grade 2: –40°C to +105°C ambient), though its specified industrial temperature range is –40°C to +85°C. This qualification confirms reliability under automotive stress conditions including thermal cycling, vibration, and ESD, making it suitable for body control, lighting, and comfort systems.
24LC32AT-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
24LC32AT-I/OT FAQ
1.How can I place an order for 24LC32AT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AT-I/OT 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-I/OT reliable?
The price and inventory of 24LC32AT-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AT-I/OT is usually 5 days.
3.What payment methods are accepted for 24LC32AT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AT-I/OT?
24LC32AT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AT-I/OT 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-I/OT?
For technical support, including 24LC32AT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AT-I/OT requirements.
6.How does Aetrix verify that 24LC32AT-I/OT is sourced from the original manufacturer or authorized distributors?
All 24LC32AT-I/OT 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-I/OT meets industry standards.
7.What is the process for return or replacement of 24LC32AT-I/OT?
All 24LC32AT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AT-I/OT, 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-I/OT part is unused and in its original packaging.
Return procedure for 24LC32AT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32AT-I/OT 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…
