Microchip Technology AT24C64A-10PI-1.8

Overview

AT24C64A-10PI-1.8 from Microchip Technology (formerly Atmel) is a 64 Kbit I²C-compatible serial EEPROM with 1.8V to 5.5V supply operation, 400 kHz clock rate at 1.8V, 32-byte page write capability, and hardware write protection via the WP pin. It is used for nonvolatile parameter storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT24C64A-10PI-1.8 datasheet, AT24C64A-10PI-1.8 pinout, AT24C64A-10PI-1.8 application, or AT24C64A-10PI-1.8 equivalent, key selection considerations include 1.8V low-voltage compatibility, 8-lead PDIP package mechanical fit, 1 million write endurance, and I²C bus addressability up to eight devices on a shared bus.

Technical Context

The AT24C64A-10PI-1.8 implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It supports standard-mode (100 kHz) and fast-mode (400 kHz) signaling, with full timing compliance at 1.8V supply - unlike earlier variants limited to 2.5V+ for 400 kHz operation.

Internally organized as 8192 × 8-bit memory (65,536 bits), it uses a 13-bit word address and supports byte-write, page-write (up to 32 bytes), and sequential read operations. Addressing relies on three hardware-configurable pins (A0–A2), enabling up to eight devices on one I²C bus without external logic.

Key Specifications

Pinout & Package

AT24C64A-10PI-1.8 is housed in an 8-lead JEDEC-standard PDIP (package code 8P3), 0.300" wide body, through-hole mountable package suitable for prototyping and industrial PCBs requiring mechanical robustness and thermal cycling resilience.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64A-10PI-1.8, AT24C64D-SSHM-T adds automotive qualification but requires PCB redesign, while M24C64-WMN6TP offers pin-compatible substitution with minor timing validation needed for 1.8V fast-mode operation.

Availability

AT24C64A-10PI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart power supply configuration, and embedded controller boot parameter storage requiring stable component supply across long production lifecycles.

Supply support for AT24C64A-10PI-1.8 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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family, delivering high-reliability nonvolatile memory solutions since 1980.

The AT24C64A-10PI-1.8 belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, low-power embedded systems requiring robust, field-programmable configuration storage with minimal board area and BOM count.

FAQ

What is the maximum I²C clock frequency supported by AT24C64A-10PI-1.8 at 1.8V?

The AT24C64A-10PI-1.8 supports up to 400 kHz I²C clock frequency at 1.8V supply, as confirmed in the AC Characteristics table of the official datasheet (3054N–SEEPR–2/04). This distinguishes it from earlier AT24C64A versions that required ≥2.5V for 400 kHz operation, making AT24C64A-10PI-1.8 suitable for direct interface with 1.8V microcontrollers without level shifting.

Does AT24C64A-10PI-1.8 support hardware write protection, and how is it implemented?

Yes, AT24C64A-10PI-1.8 implements hardware write protection via the WP (Write Protect) pin. When WP is driven high to VCC, all write operations-including byte, page, and write-enable commands-are inhibited. When WP is grounded, full read/write access is enabled. The pin has an internal pull-down, so leaving it unconnected defaults to write-enabled mode under low-capacitance board conditions.

What package type and lead count does AT24C64A-10PI-1.8 use?

AT24C64A-10PI-1.8 uses an 8-lead JEDEC-standard PDIP (Plastic Dual Inline Package), designated as package code 8P3. It features a 0.300" body width, through-hole mounting, and pin pitch of 0.100", matching legacy socket footprints and facilitating manual prototyping and repair in industrial control panels.

How many devices can share the same I²C bus with AT24C64A-10PI-1.8?

Up to eight AT24C64A-10PI-1.8 devices can share a common I²C bus, enabled by the three hardware-addressable pins A0, A1, and A2. Each combination of these pins sets a unique 3-bit device address, resulting in I²C slave addresses ranging from 0x50 to 0x57. This allows scalable configuration storage across multi-node systems without bus arbitration complexity.

What is the write endurance and data retention specification for AT24C64A-10PI-1.8?

AT24C64A-10PI-1.8 guarantees 1 million write cycles per memory location and 100 years of data retention at +25°C, as specified in the High Reliability section of its datasheet. These values are characterized and verified per JEDEC standards, ensuring long-term reliability in applications such as field-updatable calibration tables and infrequently modified system configuration data.