Overview
The 93LC76C is a 1Kbit (128 x 8 or 64 x 16) serial EEPROM manufactured by Microchip Technology and other semiconductor vendors. It operates over a wide voltage range (2.5V to 5.5V) and supports a simple Microwire-compatible serial interface, making it ideal for space-constrained designs. As a non-volatile memory solution, it retains data without power and is commonly embedded in devices like medical equipment, IoT sensors, and industrial controllers. Its small footprint and reliability have made it a staple in legacy and modern systems alike.
Structure and Working Principle
The 93LC76C consists of a memory array, charge pump for write operations, and serial interface logic. Data is transmitted via three pins: Chip Select (CS), Serial Clock (SK), and Data Input/Output (DI/DO). During writes, an internal charge pump generates the high voltage needed to program memory cells. Reads are performed sequentially, with each bit clocked out synchronously. The device includes built-in write protection features to prevent accidental data corruption.
Key Features
Low power consumption (standby current <1µA) makes the 93LC76C suitable for battery-powered devices. It offers a 3MHz clock rate for fast data access and supports both 8-bit and 16-bit organizational modes. Endurance of 1 million write cycles and data retention of 200 years ensure long-term reliability. Industrial-grade variants operate across -40°C to +85°C, meeting harsh environment requirements.
Application Areas
Primary applications include storing calibration data in automotive ECUs, preserving user settings in appliances, and logging operational parameters in industrial PLCs. It's also used in smart meters, wearables, and legacy computer peripherals. In B2B contexts, the 93LC76C is often procured in tape-and-reel packaging for automated assembly lines. Its compatibility with older designs reduces redesign efforts for manufacturers.
Maintenance and Precautions
Avoid exposing the chip to voltages beyond its rated specifications, as this may damage the charge pump circuitry. Proper decoupling capacitors (0.1µF) should be placed near the power pins to mitigate noise. When soldering, adhere to JEDEC guidelines for temperature profiles. For firmware implementation, insert delays between write cycles to prevent exceeding the maximum write time per page (typically 3-10ms).
B2B Procurement Guide
When sourcing the 93LC76C, verify traceability to authorized distributors like Arrow or Avnet to avoid counterfeit parts. MOQ (Minimum Order Quantity) typically starts at 1,000 units for competitive pricing. Consider lead times (often 8-12 weeks for non-stock items) and request samples for validation. Compare industrial (-40°C to +85°C) vs. commercial (0°C to +70°C) temperature grades based on application needs.
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