Microchip Technology 24LC16B/SN

Overview

24LC16B/SN 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 range (–40°C to +85°C). It is widely used in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the 24LC16B/SN datasheet, 24LC16B/SN pinout, 24LC16B/SN application, or 24LC16B/SN equivalent, key selection considerations include its 2.5V minimum VCC, 400 kHz I²C speed limit, 16-byte page write buffer, Schmitt-triggered SDA/SCL inputs for noise immunity, and hardware write-protect functionality with dedicated WP terminal.

Technical Context

The 24LC16B/SN 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 page writes, supporting current-address, random, and sequential read modes.

It implements on-chip slope control on SDA/SCL outputs to suppress ground bounce, integrates Schmitt-trigger inputs with ≥50 mV hysteresis (0.05 VCC), and uses an internal high-voltage generator for EEPROM programming. Write cycles are self-timed (≤5 ms) and do not require external timing control.

Key Specifications

Pinout & Package

24LC16B/SN is supplied in an 8-lead narrow SOIC (SN) package per Microchip drawing C04-057-SN, with standard 1.27 mm pitch, 3.90 mm body width, and gull-wing leads. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16B/SN, the 24AA16-I/SN offers wider voltage flexibility but no automotive qualification, while the 24FC16-I/SN provides faster I²C throughput at the cost of higher minimum VCC tolerance - both retain identical SOIC-8 packaging and functional interface compatibility.

Availability

24LC16B/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and power-fail safe parameter backup requiring stable component supply and long-term lifecycle support.

Supply support for 24LC16B/SN 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 belongs to Microchip's legacy 24XX16 serial EEPROM product line, designed specifically for cost-sensitive, low-power I²C-based nonvolatile storage in industrial, automotive, and consumer applications where reliability and proven qualification matter.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC16B/SN?

The 24LC16B/SN requires a minimum VCC of 2.5V for guaranteed operation across its full temperature range. Unlike the 24AA16 variant, it is not rated for operation below 2.5V - attempting to power the 24LC16B/SN at 1.8V or 2.2V may result in undefined behavior, failed writes, or incomplete ACK responses. Always verify VCC remains ≥2.5V under worst-case load and temperature conditions.

Does the 24LC16B/SN support 1 MHz I²C communication?

No, the 24LC16B/SN does not support 1 MHz I²C. Its maximum clock frequency is 400 kHz at VCC ≥ 2.5V. The 24FC16 variant is the family member qualified for 1 MHz operation. Using the 24LC16B/SN above 400 kHz violates AC timing specifications and risks data corruption, missed ACKs, or bus lockup - confirmed by Table 1-2 in DS20001703M.

How does the WP pin function on the 24LC16B/SN, and what happens when it is left unconnected?

The WP pin on the 24LC16B/SN is a digital input that enables hardware write protection: tied to VCC, it inhibits all write operations (byte/page); tied to VSS, it enables full read/write access. Per Table 2-1, WP is not internally pulled - leaving it floating creates an undefined logic state and may cause intermittent write-enable behavior. Always tie WP explicitly to VSS or VCC; do not leave unconnected.

Can the 24LC16B/SN be used in automotive applications, and what qualification does it hold?

Yes, the 24LC16B/SN is AEC-Q100 qualified for automotive applications. The datasheet explicitly states "Automotive AEC-Q100 Qualified" and lists Extended (E) temperature range (–40°C to +125°C) support. This qualification covers stress testing for temperature cycling, humidity, vibration, and ESD - making it suitable for body control modules, infotainment systems, and other non-safety-critical automotive subsystems.

What is the purpose of the A0, A1, and A2 pins on the 24LC16B/SN, and how should they be handled in PCB layout?

The A0, A1, and A2 pins on the 24LC16B/SN are not connected internally (NC) - they serve no functional role and are omitted from the device's slave address scheme. As stated in Section 2.1, they may be left floating or tied to VSS/VCC without affecting operation. In PCB layout, these pins require no routing or termination; however, avoid placing them in signal paths or near high-noise traces to prevent parasitic coupling.