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Microchip Technology 24LC02B/ST
- Part No.:
- 24LC02B/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC02B/ST.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:839
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Product details
Overview
24LC02B/ST from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency, 2.5V–5.5V supply range, and industrial/extended temperature support (–40°C to +125°C). It delivers low-power operation (1 µA standby, 1 mA read), 8-byte page write buffer, and Schmitt-trigger inputs for noise immunity in embedded system configuration storage.
For engineers reviewing the 24LC02B/ST datasheet, 24LC02B/ST pinout, 24LC02B/ST application, or 24LC02B/ST equivalent, key selection criteria include I²C timing compliance at 2.5V+, WP pin behavior under VCC/VSS bias, page boundary handling in firmware, and package-specific thermal and solderability constraints for SOIC-8 (ST) mounting.
Technical Context
The 24LC02B/ST implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting byte and page write modes with self-timed erase/write cycles. Its internal Address Pointer auto-increments during sequential reads and random reads require prior address setup via dummy write.
It features Schmitt-trigger inputs on SDA/SCL with 50 ns spike suppression, output slope control to limit ground bounce, and a dedicated WP pin that disables all write operations when tied to VCC-no internal pull-up/down on A0–A2 pins, which are unconnected and may float or be tied arbitrarily.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit), sufficient for device ID, calibration data, or small configuration tables |
| Interface | I²C-compatible two-wire bus, supports 100 kHz (at ≥2.5V), 400 kHz standard mode only |
| Supply Voltage | 2.5V–5.5V - excludes sub-2.5V operation unlike 24AA02/24FC02 variants |
| Write Cycle Time | ≤5 ms per byte or page - dictates minimum inter-write delay in host firmware |
| Endurance | 1 million erase/write cycles - enables long-term field logging or parameter tuning |
| Data Retention | 200 years at 25°C - suitable for lifetime-critical nonvolatile storage without refresh |
| Temperature Range | –40°C to +125°C (Extended grade) - qualified for automotive under-hood and industrial control environments |
Pinout & Package
24LC02B/ST is supplied in 8-lead SOIC (ST) package per Microchip drawing C04-061-SO. Pin 1 is index-marked; package body width 3.90 mm, lead pitch 1.27 mm, RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address Input | No internal connection - may float or tie to VSS/VCC without effect on addressing |
| A1 | Address Input | No internal connection - no impact on device address (1010xxx remains fixed) |
| A2 | Address Input | No internal connection - unused; does not enable multi-device bus addressing |
| VSS | Ground | Reference return path for all I/O and core logic; must be low-impedance |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ typical for 400 kHz) |
| SCL | Serial Clock Input | Input-only clock line synchronized to host controller; edge-sensitive for Start/Stop detection |
| WP | Write-Protect Control | Active-high protection: tied to VCC blocks all writes; tied to VSS enables full read/write access |
| VCC | Power Supply | 2.5V–5.5V input; decoupling capacitor (0.1 µF ceramic) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Write-Protection | Physical WP pin disables all memory writes when pulled high - eliminates software lockout risks |
| 8-Byte Page Write Buffer | Reduces I²C transaction count by up to 8× vs. byte writes - improves bus efficiency and firmware throughput |
| Schmitt Trigger Inputs | 50 mV hysteresis on SDA/SCL - rejects noise spikes ≤50 ns, enabling reliable operation on noisy PCBs |
| Self-Timed Erase/Write | No external timing control needed - host initiates write then polls ACK; simplifies driver implementation |
| ESD Protection | ≥4 kV HBM - meets IEC 61000-4-2 Level 2 for robustness in manufacturing and field handling |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed once at power-up via I²C; no runtime writes after commissioning. Use Value: Enables field-replaceable sensor modules with unique calibration data retained across power cycles and firmware updates. | Use Scenario: Saving user preferences (mirror position, seat settings) and fault logs in vehicle door modules operating at 125°C ambient. IC Role / Device Role / Timing Role: I²C slave storing persistent data under AEC-Q100 Grade 1 conditions; WP pin tied to VCC during normal operation to prevent accidental overwrites. Use Value: Meets automotive extended temperature and reliability requirements while minimizing BOM count versus flash-based alternatives. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Holding regulatory-mandated safety parameters (max flow rate, alarm thresholds) that must survive battery replacement and firmware upgrades. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with WP permanently asserted; accessed only during secure boot validation. Use Value: Provides immutable, low-power, radiation-tolerant storage compliant with IEC 62304 Class C software requirements. | Use Scenario: Storing delta patches applied to meter firmware during OTA updates, where main flash is write-locked during execution. IC Role / Device Role / Timing Role: Dedicated patch buffer accessed via I²C during bootloader phase; 5 ms write time aligns with safe update window. Use Value: Enables atomic, rollback-safe firmware updates without requiring larger, more expensive serial NOR flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA02-I/ST | Wider VCC range (1.7V–5.5V); lower 100 kHz max clock below 2.5V; same pinout and memory map | Supports battery-powered systems down to 1.7V; not qualified for >85°C ambient | Select when ultra-low-voltage operation is required and extended temperature is unnecessary |
| AT24C02C-SSHM-T | Same 2 Kbit size and I²C interface; 1.7V–5.5V supply; 1 MHz max clock; different WP logic (active-low) | Requires inverted WP control signal; higher speed enables faster bulk writes | Select when 1 MHz timing and active-low write protect match existing board design |
Compared with 24LC02B/ST, 24AA02-I/ST trades extended temperature support for sub-2.5V operation, while AT24C02C-SSHM-T offers higher speed and inverted WP but requires layout-level signal inversion and lacks AEC-Q100 qualification.
Availability
24LC02B/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 patch storage requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC02B/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products for embedded control applications.
The 24LC02B belongs to Microchip's 24XX02 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained, thermally demanding systems such as automotive ECUs and industrial PLCs.
FAQ
What is the maximum I²C clock frequency supported by the 24LC02B/ST?
The 24LC02B/ST supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. It does not support 1 MHz operation - that capability is exclusive to the 24FC02 variant. At 2.5V, timing parameters such as THIGH (600 ns min) and TLOW (1300 ns min) must be strictly observed to ensure reliable communication. The 24LC02B/ST datasheet explicitly limits operation to 400 kHz across its full rated voltage and temperature range.
Does the 24LC02B/ST require external pull-up resistors on SDA and SCL lines?
Yes, the 24LC02B/ST requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. The value must be selected based on bus capacitance and rise-time requirements - undersized resistors increase power consumption, oversized ones risk violating I²C rise-time specs. The 24LC02B/ST itself provides no internal pull-ups on these pins.
How does the WP pin function on the 24LC02B/ST, and what happens if it is left floating?
On the 24LC02B/ST, the WP pin is an active-high write-protect input: tying it to VCC disables all write operations (byte/page), while tying it to VSS enables full read/write access. The datasheet states WP must be connected to either VSS or VCC - leaving it floating is undefined and risks partial or intermittent protection due to noise coupling. No internal pull-up or pull-down exists, so external biasing is mandatory for deterministic behavior in production systems.
Can the 24LC02B/ST be used in automotive applications, and what qualifications does it hold?
Yes, the 24LC02B/ST is AEC-Q100 qualified for automotive applications and rated for Extended temperature range (–40°C to +125°C). It meets stress testing requirements for temperature cycling, humidity, and ESD (≥4 kV HBM), making it suitable for body control modules, infotainment peripherals, and other under-hood or cabin-mounted ECUs. Its 2.5V–5.5V supply range aligns with automotive 12V system regulation, and the SOIC-8 (ST) package supports standard reflow profiles used in automotive PCB assembly.
What is the page write capability of the 24LC02B/ST, and how should firmware handle page boundaries?
The 24LC02B/ST supports 8-byte page writes, meaning up to eight consecutive bytes can be written in a single I²C transaction. However, page boundaries occur every 8 bytes (addresses 0x00–0x07, 0x08–0x0F, etc.), and crossing a boundary causes wraparound - data intended for 0x07–0x08 overwrites 0x07–0x00 instead of writing to the next page. Firmware must validate write addresses and split transactions at page boundaries. This behavior is inherent to the 24LC02B/ST's internal architecture and cannot be disabled.
24LC02B/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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC02B/ST FAQ
1.How can I place an order for 24LC02B/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC02B/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 24LC02B/ST reliable?
The price and inventory of 24LC02B/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC02B/ST is usually 5 days.
3.What payment methods are accepted for 24LC02B/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC02B/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC02B/ST?
24LC02B/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC02B/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 24LC02B/ST?
For technical support, including 24LC02B/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC02B/ST requirements.
6.How does Aetrix verify that 24LC02B/ST is sourced from the original manufacturer or authorized distributors?
All 24LC02B/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 24LC02B/ST meets industry standards.
7.What is the process for return or replacement of 24LC02B/ST?
All 24LC02B/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC02B/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 24LC02B/ST part is unused and in its original packaging.
Return procedure for 24LC02B/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC02B/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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