Microchip Technology 24LC16B/P

Overview

24LC16B/P from Microchip Technology Inc. is a 16-Kbit I²C-compatible serial EEPROM organized as eight 256 × 8-bit 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 (I-temp). It is used in embedded systems for nonvolatile storage of calibration data, configuration settings, and firmware parameters.

For engineers reviewing the 24LC16B/P datasheet, 24LC16B/P pinout, 24LC16B/P application, or 24LC16B/P equivalent, this page provides verified electrical specs, package mapping, I²C timing constraints, endurance (1M cycles), and real-world use cases in industrial controllers and automotive modules where reliable low-power memory is required.

Technical Context

The 24LC16B/P functions as an I²C slave device with fixed 4-bit control code '1010' and 3-bit block-select addressing, enabling access to eight 256-byte 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 input filtering (≤50 ns spike suppression) for noise immunity on noisy buses, and uses open-drain SDA/SCL with external pull-ups. Write operations are self-timed with 5 ms max page write cycle, and ACK polling is supported to detect completion without fixed delays.

Key Specifications

Pinout & Package

24LC16B/P is supplied in an 8-lead PDIP (Plastic Dual In-Line Package) with 300-mil body width. Pin 1 is index-marked; A0–A2 pins are not internally connected and may be left floating or tied to VSS/VCC without functional impact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16B/P, 24AA16-I/P extends low-voltage operation but sacrifices high-speed I²C performance below 2.5V, while AT24C16C-PU provides equivalent functionality with minor current and retention trade-offs - both require validation of write-protection implementation and timing margins in production firmware.

Availability

24LC16B/P is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24LC16B/P 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, with global design and manufacturing operations.

The 24LC16B/P belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing reliable nonvolatile storage with minimal board space and I²C bus integration.

FAQ

What is the maximum I²C clock frequency supported by the 24LC16B/P?

The 24LC16B/P supports up to 400 kHz when VCC is 2.5V or higher. At voltages below 2.5V, the device is not rated for operation - unlike the 24AA16 variant, which supports 100 kHz down to 1.7V. This makes the 24LC16B/P ideal for 3.3V and 5V systems where faster bus throughput is needed without compromising timing margins. Always confirm VCC stability before enabling 400 kHz mode.

How does the WP pin function on the 24LC16B/P?

The WP (Write-Protect) pin on the 24LC16B/P is a dedicated hardware enable/disable control: when tied to VCC, all write operations (byte and page) are inhibited while read access remains fully functional; when tied to VSS or left floating, full read/write capability is enabled. This pin provides deterministic, glitch-immune protection against unintended writes during power sequencing or software faults - a key reliability feature in safety-critical applications using the 24LC16B/P.

Can the 24LC16B/P be used in automotive applications?

Yes, the 24LC16B/P is AEC-Q100 qualified for automotive use and offered in Industrial (–40°C to +85°C) and Extended (–40°C to +125°C) temperature grades. Its 1 μA standby current, hardware write-protection, and 4 kV ESD rating make it suitable for body control modules, infotainment configuration storage, and ADAS sensor calibration memory. Ensure the selected package variant (e.g., 24LC16B-IP for Industrial grade) matches the target vehicle environment's thermal and qualification requirements.

What is the purpose of the A0, A1, and A2 pins on the 24LC16B/P?

The A0, A1, and A2 pins on the 24LC16B/P are not internally connected and serve no functional role - they are NC (no-connect) pins. Per Microchip's datasheet, these pins may be left floating or tied to VSS or VCC without affecting device operation. This differs from higher-density EEPROMs (e.g., 24LC256) that use these pins for device addressing; the 24LC16B/P uses only the fixed '1010' control code and block-select bits, limiting it to one device per I²C bus segment.

How many write cycles can the 24LC16B/P endure before failure?

The 24LC16B/P is rated for more than 1,000,000 erase/write cycles per memory location under standard conditions (25°C, 5.5V). This endurance is validated using page-write mode and applies across the full temperature range. Real-world wear leveling is not implemented in hardware, so firmware must avoid repeatedly writing to the same address. For applications requiring >1M updates, consider distributing writes across multiple addresses or using Microchip's Total Endurance™ Model to estimate field lifetime based on actual usage patterns and voltage/temperature conditions.