Microchip Technology AT24C1024W-10SI-2.7-T

Overview

AT24C1024W-10SI-2.7-T from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM with 2.7–5.5 V operation, 400 kHz clock rate at 2.7 V, and hardware write protection via the WP pin. It supports 256-byte page writes, random/sequential reads, and operates across –40°C to +85°C for industrial embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the AT24C1024W-10SI-2.7-T datasheet, AT24C1024W-10SI-2.7-T pinout, AT24C1024W-10SI-2.7-T application, or AT24C1024W-10SI-2.7-T equivalent, key selection criteria include its 2.7 V minimum supply, 100,000 write cycles per page, 40-year data retention, 8-lead EIAJ SOIC package, and cascading support for up to two devices on one I²C bus.

Technical Context

The AT24C1024W-10SI-2.7-T implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SCL and SDA inputs. Its internal address space is segmented into 512 pages of 256 bytes each, requiring a 17-bit word address where the P0 bit is sourced from the device address byte.

Write protection is enforced via the dedicated WP pin: tied to VCC, it inhibits all writes; left unconnected, it defaults to GND enabling full write access. Device addressing uses A1 as the sole hardware-selectable bit, allowing two AT24C1024 devices on a shared bus without external logic.

Key Specifications

Pinout & Package

AT24C1024W-10SI-2.7-T is housed in an 8-lead EIAJ SOIC package (package code 8S2), measuring 5.13–5.38 mm × 5.13–5.41 mm × 1.78–2.03 mm, with 1.27 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C1024W-10SI-2.7-T, the PDIP variant trades miniaturization for serviceability, while the CAT24C1024 offers higher endurance at the cost of different long-term retention behavior - both require separate qualification for safety-critical use.

Availability

AT24C1024W-10SI-2.7-T is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, medical devices, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for AT24C1024W-10SI-2.7-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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on embedded control and connectivity.

The AT24Cxx family delivers standardized, I²C-compatible serial EEPROMs optimized for industrial, automotive, and medical applications demanding low-voltage operation, high reliability, and long data retention.

FAQ

What is the maximum clock frequency supported by AT24C1024W-10SI-2.7-T at 2.7 V?

The AT24C1024W-10SI-2.7-T supports a maximum clock frequency of 400 kHz when operated at 2.7 V. This value is specified in the AC Characteristics table of the datasheet and reflects the guaranteed timing margin under minimum supply conditions. At 5.0 V, the device supports up to 1 MHz, but AT24C1024W-10SI-2.7-T is rated for 2.7–5.5 V operation and must meet 400 kHz timing at the lower end of that range.

How does the WP pin function on AT24C1024W-10SI-2.7-T?

The WP (Write Protect) pin on AT24C1024W-10SI-2.7-T is a hardware-enforced security feature. When tied to VCC, it disables all write operations including byte, page, and erase commands. When left unconnected, it is internally pulled down to GND, enabling normal write functionality. This behavior allows board-level protection without firmware dependency - a critical safeguard in AT24C1024W-10SI-2.7-T deployments where accidental overwrites must be prevented.

What package type is used for AT24C1024W-10SI-2.7-T?

AT24C1024W-10SI-2.7-T uses an 8-lead EIAJ SOIC package (package code 8S2), with gull-wing leads, 1.27 mm pitch, and body dimensions of 5.13–5.38 mm × 5.13–5.41 mm. This surface-mount package is optimized for automated assembly and space-constrained industrial PCBs, distinguishing it from PDIP, LAP, or dBGA variants in the same AT24C1024 family.

Can multiple AT24C1024W-10SI-2.7-T devices share the same I²C bus?

Yes, up to two AT24C1024W-10SI-2.7-T devices can share a single I²C bus using the A1 pin for hardware address differentiation. The A1 pin serves as the least significant bit of the 7-bit device address, allowing addresses 0x50 and 0x51. No additional address lines or external logic are required - this cascading capability is intrinsic to the AT24C1024W-10SI-2.7-T design and documented in the Device Addressing section.

What is the endurance rating of AT24C1024W-10SI-2.7-T?

The AT24C1024W-10SI-2.7-T is rated for 100,000 write cycles per memory page. This endurance specification applies to each of the 512 internal 256-byte pages independently. Page-level wear leveling is not implemented; therefore, repeated writes to the same page address will consume endurance at that location. The rating is validated under 5.0 V and 25°C per the datasheet's Endurance test condition.