Microchip Technology AT24C01A-10SI-2.7

Overview

AT24C01A-10SI-2.7 from Microchip Technology (formerly Atmel) is a 1K-bit (128 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 2.7V to 5.5V, supports 100 kHz I²C bus speed, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage, power supply configuration memory, and firmware parameter backup.

For engineers reviewing the AT24C01A-10SI-2.7 datasheet, AT24C01A-10SI-2.7 pinout, AT24C01A-10SI-2.7 application, or AT24C01A-10SI-2.7 equivalent, key selection criteria include its 2.7–5.5V operating range, 8-byte page write capability, SOIC-8 industrial-grade packaging, and compatibility with microcontroller I²C peripherals requiring robust nonvolatile configuration storage.

Technical Context

The AT24C01A-10SI-2.7 implements a standard two-wire I²C interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It uses a 7-bit internal word address for random access and supports byte-write and 8-byte page-write modes with self-timed 10 ms max write cycles.

Device addressing relies on hardwired A0–A2 pins (all grounded or configured per bus topology), enabling up to eight devices on one I²C bus. The WP pin provides hardware-level write protection: tied to VCC to lock the full 1K array, or GND for normal read/write operation.

Key Specifications

Pinout & Package

AT24C01A-10SI-2.7 is housed in an 8-lead JEDEC-standard SOIC package (8S1), measuring 4.9 mm × 3.9 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01A-10SI-2.7, AT24C02A-10SI-2.7 doubles memory while maintaining pinout and timing, whereas M24C01-RMN6TP omits the WP pin - requiring firmware-level safeguards instead of hardware-enforced write blocking.

Availability

AT24C01A-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded bootloader settings requiring stable component supply across long production lifecycles.

Supply support for AT24C01A-10SI-2.7 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 global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.

The AT24C01A-10SI-2.7 belongs to Microchip's legacy serial EEPROM family, designed specifically for space-constrained, low-power industrial and automotive applications requiring robust, pin-compatible configuration storage.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01A-10SI-2.7?

The AT24C01A-10SI-2.7 supports up to 100 kHz I²C clock frequency under its 2.7–5.5V operating range. This is specified in the AC Characteristics table for 2.7V, 2.5V, and 1.8V versions. While 5V variants support 400 kHz, the -2.7 suffix confirms this part is rated for 100 kHz maximum - ensuring timing margin in electrically noisy environments typical of industrial control systems. AT24C01A-10SI-2.7 maintains full functionality within this constraint.

Does the AT24C01A-10SI-2.7 have hardware write protection, and how is it implemented?

Yes, the AT24C01A-10SI-2.7 includes a dedicated Write Protect (WP) pin. When WP is tied to VCC, the entire 1K memory array is locked against write operations; when grounded, full read/write access is enabled. This hardware-level protection prevents accidental overwrites during power-up transients or firmware bugs. The WP function is active regardless of I²C command state, and AT24C01A-10SI-2.7 does not require any software initialization to engage it.

What package type and dimensions does the AT24C01A-10SI-2.7 use?

The AT24C01A-10SI-2.7 uses an 8-lead JEDEC SOIC package (designated 8S1), with body dimensions of 4.90 mm × 3.90 mm × 1.75 mm and 1.27 mm lead pitch. It conforms to MS-012AA standards and is compatible with standard surface-mount reflow profiles. The "SI" in the part number explicitly denotes this SOIC packaging, and AT24C01A-10SI-2.7 shares footprint and soldering requirements with other 8S1 EEPROMs in the family.

How many devices can share the same I²C bus with the AT24C01A-10SI-2.7?

Up to eight AT24C01A-10SI-2.7 devices can operate on a single I²C bus. This is enabled by its three hard-wired device address inputs (A0, A1, A2), each configurable as high or low. With all three grounded (default configuration), the base address becomes 1010000b; varying A0–A2 yields seven additional unique addresses (1010001b through 1010111b). AT24C01A-10SI-2.7 does not require external address decoding logic - address resolution is handled entirely within the I²C protocol.

What is the write endurance and data retention specification for the AT24C01A-10SI-2.7?

The AT24C01A-10SI-2.7 is rated for 1 million write/erase cycles and guarantees 100 years of data retention at +25°C. These values are characterized and published in the DC and reliability sections of the official datasheet. Endurance applies to individual memory locations, and retention is measured under stable storage conditions - both specifications are fully met by AT24C01A-10SI-2.7 in industrial temperature operation (-40°C to +85°C), with minor derating per JEDEC standards.