Microchip Technology 24C16/P

Overview

24C16/P from Microchip Technology is a 16 Kbit I²C-compatible serial EEPROM organized as 2048 words × 8 bits, operating from 2.5 V to 5.5 V with write cycle time of 5 ms max and endurance of 1 million erase/write cycles. It features hardware write protection via WP pin, supports standard (100 kHz) and fast (400 kHz) I²C modes, and is used in industrial control panels for parameter storage and calibration data retention.

For engineers reviewing the 24C16/P datasheet, 24C16/P pinout, 24C16/P application, or 24C16/P equivalent, key selection criteria include I²C address configuration (A0–A1 pins), byte/page write capability (up to 16 bytes per page), data retention (200 years), and compatibility with legacy 24Cxx family firmware interfaces.

Technical Context

The 24C16/P implements a two-wire I²C interface with open-drain SDA/SCL lines, internal address counter auto-increment, and page-write buffer logic enabling burst writes across 16-byte boundaries. It uses CMOS technology with Schmitt-trigger inputs for noise immunity on bus lines.

Device addressing follows I²C protocol: 7-bit slave address includes fixed 1010b prefix plus A1/A0 pin states, allowing up to four devices on same bus. Write protection is controlled by external WP pin tied to V_SS (enabled) or V_CC/floating (disabled).

Key Specifications

Pinout & Package

24C16/P is housed in an 8-lead PDIP package (0.300" width) with standard through-hole mounting. Pin functions are electrically defined per Microchip's MCHPS03760-1 specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C16D-SSHM-T and BR24G16NUX-10, the 24C16/P offers direct PDIP compatibility, lowest write latency (5 ms), and proven field reliability in legacy industrial designs-but lacks ECC and high-temp retention certification.

Availability

24C16/P is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostics equipment, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for 24C16/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog components, and memory products for embedded control applications.

The 24Cxx EEPROM family was designed to provide cost-effective, I²C-compatible nonvolatile storage for configuration, calibration, and event logging in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24C16/P?

The 24C16/P supports Fast-mode I²C operation up to 400 kHz, as specified in Microchip's MCHPS03760-1 datasheet. This allows faster parameter reads and writes compared to Standard-mode (100 kHz) devices, reducing bus occupancy time in time-sensitive applications. The 24C16/P maintains full timing compliance-including setup/hold times and rise/fall specifications-at this speed when used with appropriate pull-up resistors and bus capacitance.

Does the 24C16/P require an external pull-up resistor on the SDA and SCL lines?

Yes, the 24C16/P requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. Typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The 24C16/P datasheet specifies maximum allowable bus capacitance (400 pF) and recommends resistor selection based on target I²C speed-ensuring reliable communication without signal integrity issues.

How many unique I²C addresses can be assigned to the 24C16/P on a single bus?

The 24C16/P supports four unique I²C slave addresses using its A0 and A1 address input pins. Each pin can be tied to V_SS or V_CC, generating combinations that set bits A1:A0 in the 7-bit address (1010 A1 A0 R/W). This allows up to four 24C16/P devices-or mixed 24Cxx family members-to coexist on the same I²C bus without address conflict.

Can the 24C16/P be used in place of the older 24C02 or 24C04 EEPROMs?

Yes, the 24C16/P is software- and pin-compatible with earlier 24Cxx devices like the 24C02 and 24C04, sharing identical I²C protocol, pinout, and control logic. Its larger 16 Kbit capacity allows backward-compatible upgrades without firmware changes-provided address pointer handling accounts for extended memory depth. The 24C16/P retains the same 5 ms write cycle and WP pin behavior as those legacy parts.

What is the purpose of the WP (Write Protect) pin on the 24C16/P?

The WP pin on the 24C16/P provides hardware-level write protection: when pulled low, it disables all write operations-including byte, page, and sequential writes-while read operations remain fully functional. This prevents accidental or malicious overwrites during power transitions, firmware resets, or ESD events. The 24C16/P does not support software write protection; WP is the sole mechanism for guaranteed data integrity.