24LC512T-I/SM - 512Kbit I2C EEPROM, 400kHz, 8-SOIJ | Microchip
MPN: 24LC512T-I/SM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.25 | $12.50 |
| 100 | $1.04 | $104.00 |
| 500 | $0.87 | $435.00 |
| 1,000 | $0.72 | $720.00 |
24LC512T-I/SM Overview
A serial EEPROM is a type of non-volatile memory that retains data without power using an electrically erasable programmable read-only memory (EEPROM) cell array, and is accessed over a low-pin-count serial bus such as I2C. Within the broader memory hierarchy, serial EEPROMs sit alongside Flash memory, SRAM, and DRAM as byte-level non-volatile storage optimized for low-power, small-footprint, frequent-write applications such as configuration storage, calibration constants, and user preference retention in battery-backed or energy-harvesting systems.
Key features of the 24LC512T-I/SM include hardware write protection via the WP pin, a 128-byte page write buffer for efficient bulk programming, 64-byte page write modes, hardware and software write protection, and support for up to eight devices on a single I2C bus via three address pins (A0, A1, A2). Endurance is rated at greater than 1,000,000 erase/write cycles per page with data retention exceeding 200 years, making it suitable for applications requiring long-term parameter storage with periodic in-system updates.
Architecturally, the device uses a CMOS process with on-chip charge pump for high-voltage generation during programming. An internal data buffer holds the most recent read address, and a self-timed programming cycle offloads the host controller during writes. A cascading feature allows up to eight 24LC512 devices to share a single I2C bus, expanding the effective storage to 4 Mbit without additional addressing logic.
Typical applications include personal communications devices, data acquisition systems, industrial controllers, automotive infotainment and body modules, smart metering, white goods, and any embedded system requiring reliable configuration storage. The wide voltage range (2.5V-5.5V) and low standby current (typically 1 uA) make it especially attractive for battery-powered IoT nodes and portable instruments where every microamp matters.
When designing with the 24LC512T-I/SM, place 0.1 uF decoupling capacitors close to VCC, use proper I2C pull-up resistors (typically 4.7 kohm at 400 kHz), and ensure write cycle time (5 ms max) is respected by the firmware. Always tie WP low for read/write operation or high to protect the upper 256 bytes of memory. Operating above 5.5V will permanently damage the device.
This page synthesizes distributor pricing, drop-in same-package alternatives from the same 24LC512 family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for 24LC512T-I/SM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
24LC512-I/SM
✅ Drop-In📋 Reference alternative (not in catalog)
24FC512T-I/SM
✅ Drop-In📋 Reference alternative (not in catalog)
24AA512T-I/SM
✅ Drop-In📋 Reference alternative (not in catalog)
24LC512T-I/SMG
✅ Drop-In📋 Reference alternative (not in catalog)
24LC512-E/SM
✅ Drop-In📋 Reference alternative (not in catalog)
24LC512T-I/SM Specifications
| Memory Type | Non-volatile EEPROM (Electrically Erasable PROM) |
| Memory Density | 512 Kbit (64K x 8) |
| Number of Words | 65,536 words |
| Bits per Word | 8 bits |
| Bus Interface | I2C (2-wire serial) |
| Maximum Clock Frequency | 400 kHz |
| Access Time | 900 ns |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Page Write Buffer Size | 128 bytes |
| Write Endurance | > 1,000,000 erase/write cycles |
| Data Retention | > 200 years |
| Standby Current | 1 uA (typical) |
| Package | 8-SOIJ (Small Outline J-lead) |
| Mounting Type | Surface Mount |
| Address Pins | A0, A1, A2 (supports up to 8 devices on bus) |
| Write Protection | Hardware (WP pin) - protects upper 256 bytes |
| Cascading | Up to 8 devices per I2C bus |
| Packaging Suffix | T = Tape and Reel |
| RoHS Status | Compliant |
24LC512T-I/SM Pin Configuration
| Pin 1 | A0 — Chip address input bit 0 |
| Pin 2 | A1 — Chip address input bit 1 |
| Pin 3 | A2 — Chip address input bit 2 |
| Pin 4 | VSS — Ground reference |
| Pin 5 | SDA — Serial data I/O (open-drain, requires pull-up) |
| Pin 6 | SCL — Serial clock input |
| Pin 7 | WP — Write protect (active high - protects upper 256 bytes) |
| Pin 8 | VCC — Positive supply voltage (2.5V to 5.5V) |
Typical Applications
24LC512T-I/SM is suitable for 6 applications: Industrial Data Acquisition & Calibration Storage, Smart Meter & Energy Monitoring, Automotive Body & Infotainment Modules, Personal Communications & Wearable Devices, IoT Sensor Nodes & Edge Devices, White Goods & Home Appliance Control.
Industrial Data Acquisition & Calibration Storage
The 24LC512T-I/SM is ideally suited for storing calibration coefficients and configuration parameters in industrial data acquisition modules. Its 512 Kbit density (64K x 8) provides ample space for multi-point sensor calibration tables, factory-set gain/offset values, and serial number storage across product variants. The -40C to +85C industrial temperature range guarantees reliable operation in factory floor environments with thermal cycling. With greater than 1,000,000 erase/write cycles endurance and 200-year data retention, calibration data remains accurate through the full product lifetime. The 2.5V-5.5V supply range is compatible with both 3.3V and 5V industrial MCU rails. In a typical 4-20mA loop-powered transmitter, the EEPROM stores calibration data that the MCU reads at boot to apply linearization, while the 128-byte page write buffer enables efficient bulk updates during factory calibration.
Recommended
Smart Meter & Energy Monitoring
The 24LC512T-I/SM serves as non-volatile event log storage in smart electricity, water, and gas meters where tamper events, billing snapshots, and historical consumption records must survive power outages. The 512 Kbit capacity can store thousands of timestamped event records with rolling-over index management. The wide 2.5V-5.5V supply range tolerates the voltage swings common in battery-backed metering systems, and the 1 uA standby current preserves battery life during line-power interruptions. With hardware write protection via the WP pin, the upper memory region holding critical billing data can be locked against firmware bugs or unauthorized access. The 8-SOIJ package offers excellent mechanical reliability in vibrating meter installations. Typical firmware flows use the 128-byte page write to log consumption events efficiently during each AC zero-crossing interval.
Recommended
Automotive Body & Infotainment Modules
The 24LC512T-I/SM is well suited for storing user preferences, audio equalizer settings, seat/mirror position memory, and infotainment system configuration in automotive body control modules. While not AEC-Q100 qualified itself, the automotive-grade 24LC512T-I/SN variant is widely used in non-safety automotive subsystems where the industrial -40C to +85C temperature range is acceptable. The 512 Kbit capacity supports rich configuration sets including per-user radio presets, climate preferences, and personalization profiles. The I2C interface integrates seamlessly with automotive MCU and SoC platforms that have multiple I2C buses available. The hardware WP pin enables protection of critical ECU calibration data from accidental writes. The 8-SOIJ package's J-lead construction provides superior thermal cycling reliability versus gull-wing packages in automotive under-hood-adjacent environments.
Recommended
Personal Communications & Wearable Devices
The 24LC512T-I/SM fits naturally in personal communications devices and wearables where small form factor, low power, and reliable non-volatile storage of device settings are essential. The 8-SOIJ package's compact footprint saves board space in wearables like fitness bands, smartwatches, and Bluetooth earbuds where every square millimeter matters. Its 1 uA typical standby current draws negligible power during sleep states, preserving the multi-day battery life expected by users. The 512 Kbit capacity stores BLE pairing records, user profiles, last-used settings, and firmware update logs across power cycles. The 2.5V-5.5V range directly accommodates single-cell Li-ion battery voltages (3.0V-4.2V) without additional regulation. In typical implementations, the MCU writes user activity logs in 128-byte page-mode bursts at session boundaries, then drops back to deep sleep.
Recommended
IoT Sensor Nodes & Edge Devices
The 24LC512T-I/SM serves as event buffering and configuration storage in IoT edge sensor nodes that wake periodically to sample sensors, log data, and transmit over wireless links. The 512 Kbit density can buffer many hours of sensor readings between wireless transmissions, enabling deep-sleep radio duty cycling that extends battery life to months or years. The I2C interface connects directly to virtually any IoT MCU platform including PIC, MSP430, STM32, and ESP32 families. The 128-byte page write buffer enables efficient atomic block updates when committing sensor readings during transmission windows. The 2.5V-5.5V supply range supports both regulated 3.3V rails and direct battery connection from 2xAA cells. The hardware WP pin protects security keys and provisioning certificates against firmware compromise.
Recommended
White Goods & Home Appliance Control
The 24LC512T-I/SM is extensively deployed in washing machines, dishwashers, ovens, and HVAC controllers where long-term program parameters, fault history, and user preferences must persist across power cycles and brownout events. The 512 Kbit density accommodates complete cycle definitions, wash recipe presets, and diagnostic event logs accumulated over the appliance lifetime. The -40C to +85C industrial temperature range tolerates the elevated ambient temperatures near heating elements and motor drives. The hardware write protection enables protection of safety-critical parameters (over-temperature limits, motor current limits) from accidental firmware corruption. The 8-SOIJ package's J-lead construction withstands the thermal cycling and vibration of appliance environments better than gull-wing leaded packages. Typical designs use the 128-byte page write to commit completed wash cycles to the audit log.
Recommended
Recommended Products Summary
Engineering reference data for 24LC512T-I/SM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 24LC512-I/SM | 24FC512T-I/SM | 24AA512T-I/SM | 24LC512T-I/SMG | 24LC512-E/SM |
|---|---|---|---|---|---|---|
| Package | 8-SOIJ | 8-SOIJ - same | 8-SOIJ - same | 8-SOIJ - same | 8-SOIJ - same | 8-SOIJ - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Memory Density | 512 Kbit | 512 Kbit | 512 Kbit | 512 Kbit | 512 Kbit | 512 Kbit |
| Supply Voltage Range | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 1.7V to 5.5V (wider) | 2.5V to 5.5V | 2.5V to 5.5V |
| Max I2C Clock | 400 kHz | 400 kHz | 1 MHz (faster) | 400 kHz | 400 kHz | 400 kHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (Commercial) |
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tape & Reel | Tape & Reel | Tube |
| Write Endurance | > 1,000,000 cycles | > 1,000,000 cycles | > 1,000,000 cycles | > 1,000,000 cycles | > 1,000,000 cycles | > 1,000,000 cycles |
| Data Retention | > 200 years | > 200 years | > 200 years | > 200 years | > 200 years | > 200 years |
| Page Write Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
Key Differentiators
- Same-package drop-in upgrade path to 1 MHz I2C clock (vs 24FC512T-I/SM)
- Extended voltage range variant for low-voltage designs (vs 24AA512T-I/SM)
- Lead-free matte-tin finish for modern assembly (vs 24LC512T-I/SMG)
Design Notes
Decoupling: Place a 0.1 uF ceramic bypass capacitor as close as possible to the VCC pin (Pin 8) to suppress high-frequency noise on the supply rail. The 24LC512T-I/SM draws brief current spikes during write cycles (up to 3 mA typical), so a low-ESR ceramic is essential. A bulk 1-10 uF tantalum or aluminum capacitor on the VCC rail helps maintain supply stability during multi-byte page writes. Avoid sharing VCC traces with high-current switching loads without proper filtering.
I2C Bus Design: The SDA (Pin 5) and SCL (Pin 6) lines are open-drain and require external pull-up resistors. At 400 kHz, use 4.7 kohm pull-ups to VCC; at 100 kHz, use 10 kohm. For bus lengths over 10 cm, reduce pull-up values to compensate for cable capacitance. Keep SDA/SCL traces short and parallel, and route them away from switching signals. Place 4.7kohm resistors close to the master MCU, not the EEPROM, to ensure clean rise times. Address pins A0, A1, A2 (Pins 1-3) must be tied directly to VCC or VSS - never left floating.
Write Cycle Timing: The 24LC512T-I/SM requires a maximum 5 ms write cycle time per page write operation. Initiating a new I2C transaction before this time elapses will result in data corruption and bus errors. Firmware must either poll for ACK (which is delayed by the internal write cycle) or implement a fixed 5 ms delay between writes. A common pitfall is using the EEPROM's ACK as a 'write complete' indicator - the device only releases SDA after the internal write cycle finishes, not before. Also note that exceeding 128 bytes in a single page write causes the address counter to wrap around and overwrite earlier data in the same page.
Write Protect Pin: The WP pin (Pin 7) when tied HIGH protects the upper 256 bytes (addresses 0x8000-0xFFFF) from being written. When WP is LOW, the entire memory array is read/write accessible. Note that read operations are ALWAYS permitted regardless of WP state. For applications where critical configuration data must be protected against firmware bugs, tie WP HIGH through a 10 kohm resistor to VCC and use the MCU to drive it LOW only during authorized write windows. Never leave WP floating - this can cause intermittent write protection failures.
J-Lead SOIJ Package: The 8-SOIJ package uses J-leads which provide superior thermal cycling reliability and mechanical strength compared to gull-wing SOIC packages. This makes the 24LC512T-I/SM particularly suitable for applications with mechanical vibration or thermal cycling stress. The recommended reflow profile per JEDEC J-STD-020 is peak temperature 260C for MSL-3 parts. For hand-soldering or rework, use a fine-tip soldering iron at 315C maximum and avoid prolonged heating to prevent package damage.
Compliance Information
RoHS and REACH compliant per Microchip product page. Standard /SM variant is lead-free but uses NiPdAu lead finish; for matte-tin Sn finish choose /SMG. Not AEC-Q100 qualified for automotive - the automotive variant is 24LC512T-I/SN.
