Microchip Technology AT24C01C-SSPD-T

Overview

AT24C01C-SSPD-T from Microchip Technology (acquired Atmel) is a 1-kilobit (128 × 8) automotive-grade serial EEPROM with I²C-compatible 2-wire interface, 2.5V–5.5V supply range, -40°C to +125°C Grade 1 operation, and hardware write protection via WP pin. It delivers 1,000,000 write cycles and 100-year data retention in JEDEC SOIC-8 packaging for nonvolatile configuration storage in engine control units and ADAS modules.

For engineers reviewing the AT24C01C-SSPD-T datasheet, AT24C01C-SSPD-T pinout, AT24C01C-SSPD-T application, or AT24C01C-SSPD-T equivalent, key selection criteria include Grade 1 automotive qualification, 8-byte page write capability, Schmitt-triggered noise-immune inputs, self-timed 5ms max write cycle, and compatibility with standard I²C bus timing at 400kHz (2.5V).

Technical Context

The AT24C01C-SSPD-T implements a synchronous serial interface using open-drain SDA and edge-triggered SCL pins, supporting byte and 8-byte page writes with internal address incrementing and automatic page boundary roll-over. Its memory array is organized as 16 pages of 8 bytes each, requiring a 7-bit word address for random access.

It features hardware write protection via the WP pin (active-high), Schmitt-triggered inputs for robust noise immunity, and an internally timed write cycle that disables all inputs until completion-requiring acknowledge polling or fixed 5ms delay before subsequent access. Power-on reset threshold is set just below V_CC,min (2.5V), demanding monotonic power ramp-up under 1ms.

Key Specifications

Pinout & Package

AT24C01C-SSPD-T is supplied in an 8-lead JEDEC SOIC package (package code 8S1), measuring 4.90 mm × 6.00 mm × 1.75 mm with 1.27 mm lead 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 M95128-DFMN6TP and BR24G01FJ-3GE2, the AT24C01C-SSPD-T uniquely combines I²C compatibility, Grade 1 automotive qualification, and integrated WP pin in SOIC-8 - making it optimal for safety-critical powertrain and chassis systems requiring guaranteed write protection and extended temperature resilience.

Availability

AT24C01C-SSPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, body control modules, and electric power steering systems requiring stable component supply with automotive-grade reliability and traceable sourcing.

Supply support for AT24C01C-SSPD-T 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 product support, documentation, and manufacturing continuity for the AT24C01C-SSPD-T and its legacy Atmel EEPROM portfolio.

The AT24C01C-SSPD-T belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for reliable nonvolatile data storage in harsh-temperature, high-vibration automotive subsystems where firmware and calibration persistence is mission-critical.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01C-SSPD-T?

The AT24C01C-SSPD-T supports up to 400kHz I²C clock frequency when operated at VCC = 2.5V. At lower voltages (e.g., 1.7V), the maximum frequency is reduced per AC specifications in the datasheet. The device fully complies with standard-mode I²C timing requirements, including tLOW ≥ 1200ns and tHIGH ≥ 600ns.

Does the AT24C01C-SSPD-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01C-SSPD-T requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2kΩ to 10kΩ depending on bus capacitance and speed requirements. The exact value must be calculated per I²C bus design guidelines to ensure rise time compliance (tR ≤ 300ns).

How does the Write Protect (WP) pin function on the AT24C01C-SSPD-T?

When the WP pin is driven high (to VCC), the AT24C01C-SSPD-T disables all write operations-including byte, page, and write-enable commands-to the entire memory array. When WP is grounded, normal read/write functionality is restored. This hardware-level protection operates independently of I²C commands and remains active during power transitions.

What is the memory organization of the AT24C01C-SSPD-T?

The AT24C01C-SSPD-T contains 128 words of 8-bit memory, organized as 16 pages of 8 bytes each. It uses a 7-bit word address for random access. Internal address incrementing allows sequential reads/writes across page boundaries, with automatic roll-over from last byte of one page to first byte of the next during sequential operations.

Is the AT24C01C-SSPD-T compatible with standard I²C controllers?

Yes, the AT24C01C-SSPD-T is fully compatible with standard I²C controllers compliant with Philips I²C specification v2.1. It responds to the base device address 0b1010xxx (where xxx is configured by A2/A1/A0 pins) and supports standard START/STOP, ACK/NACK, and repeated START protocols without requiring special initialization or mode configuration.