Microchip Technology 24LC16B-I/MS

Overview

24LC16B-I/MS from Microchip Technology Inc. is a 16-Kbit I²C-compatible serial EEPROM organized as eight 256 × 8-bit memory blocks. It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency, features hardware write-protection via the WP pin, and delivers ≤1 μA standby current at industrial temperature (–40°C to +85°C). It is commonly used in embedded systems for storing calibration data, configuration settings, and firmware parameters.

For engineers reviewing the 24LC16B-I/MS datasheet, 24LC16B-I/MS pinout, 24LC16B-I/MS application, or 24LC16B-I/MS equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), I²C timing compliance at 400 kHz, page write buffer size (16 bytes), endurance (1 million cycles), and MSOP-8 package footprint constraints.

Technical Context

The 24LC16B-I/MS functions as an I²C slave device with fixed 4-bit control code '1010' and 3-bit block-select addressing, enabling access to eight 256-word memory blocks. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

It implements Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce. Write operations are self-timed with a maximum 5 ms cycle time, and acknowledge polling is supported to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24LC16B-I/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch and exposed pad option. The package is RoHS-compliant and rated for industrial temperature (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24LC16B-I/MS, the 24AA16-I/MS offers broader low-voltage operation but lacks AEC-Q100 qualification, while the AT24C16C-MAHM-T provides faster I²C timing but originates from a different manufacturer with distinct qualification and longevity roadmaps.

Availability

24LC16B-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, medical device settings, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for 24LC16B-I/MS 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.

The 24LC16B-I/MS belongs to Microchip's 24XX16 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space- and cost-constrained embedded systems.

FAQ

What is the minimum operating voltage for the 24LC16B-I/MS?

The 24LC16B-I/MS requires a minimum VCC of 2.5V. Unlike the 24AA16 variant, it is not specified to operate below this threshold - attempting to power it at 1.8V or 2.2V will result in undefined behavior or failure to respond on the I²C bus. This limitation is explicitly defined in the Device Selection Table and Electrical Characteristics section of the datasheet.

Does the 24LC16B-I/MS support 1 MHz I²C communication?

No, the 24LC16B-I/MS does not support 1 MHz I²C operation. Its maximum clock frequency is 400 kHz across the full 2.5V–5.5V VCC range. The 24FC16 variant is the only member of the 24XX16 family rated for 1 MHz; using 24LC16B-I/MS at higher frequencies violates AC timing specifications and risks data corruption or bus lockup.

How many memory blocks does the 24LC16B-I/MS have, and how are they addressed?

The 24LC16B-I/MS contains eight 256-word memory blocks (total 2048 bytes), selected via the three most significant bits (B2–B0) of the I²C slave address. These bits follow the fixed 4-bit control code '1010', forming a 7-bit slave address. Each block is accessed independently, and the internal address pointer resets per block during sequential reads.

Can the A0, A1, and A2 pins on the 24LC16B-I/MS be used for device addressing?

No - the A0, A1, and A2 pins on the 24LC16B-I/MS are not internally connected and serve no addressing function. They may be left floating or tied to VSS/VCC without affecting operation. Device addressing is handled exclusively through the fixed 7-bit slave address ('1010' + B2B1B0), limiting one 24LC16B-I/MS per I²C bus segment unless external multiplexing is used.

What is the purpose of the WP pin on the 24LC16B-I/MS, and how should it be used?

The WP (Write-Protect) pin on the 24LC16B-I/MS provides hardware-level global write inhibition. When tied to VCC, all write operations (byte and page) to the entire 2048-byte memory array are blocked; read operations remain fully functional. For normal operation, connect WP to VSS. This feature eliminates the need for software-based protection schemes and prevents accidental overwrites during power transitions or firmware faults.