Microchip Technology AT25010AY1-10YU-1.8

Overview

AT25010AY1-10YU-1.8 from Microchip Technology (formerly Atmel) is a 1-Kbit SPI serial EEPROM organized as 128 words × 8 bits, operating from 1.8 V to 5.5 V with 20 MHz max clock rate at 5 V, 8-byte page write capability, and block write protection for 1/4, 1/2, or full memory array-used in industrial sensor calibration storage and embedded microcontroller configuration retention.

For engineers reviewing the AT25010AY1-10YU-1.8 datasheet, AT25010AY1-10YU-1.8 pinout, AT25010AY1-10YU-1.8 application, or AT25010AY1-10YU-1.8 equivalent, key selection criteria include 1.8 V minimum supply compatibility, 5 ms max self-timed write cycle, WP/HOLD pin support for hardware data protection, and 8-lead Ultra Thin mini-MAP (MLP 2×3 mm) package footprint.

Technical Context

The AT25010AY1-10YU-1.8 implements a synchronous SPI slave interface supporting Modes 0 and 3, with separate SI/SO pins and CS-controlled selection. It uses an internal status register (BP1/BP0/WEN/RDY) to manage write enable state and four-level block protection.

Its architecture includes a dedicated clock generator, address decoder, data register, and output buffer, enabling continuous read with automatic address increment and page-mode writes that internally increment low-order address bits while holding high-order bits constant across up to 8 bytes.

Key Specifications

Pinout & Package

AT25010AY1-10YU-1.8 is housed in an 8-lead Ultra Thin mini-MAP (MLP 2×3 mm) package, RoHS-compliant, with dual no-lead construction and 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-WMN6TP and BR24G01NUX-10, the AT25010AY1-10YU-1.8 offers optimal balance of SPI compatibility, 1.8 V performance, hardware HOLD/WP control, and compact MLP packaging-making it preferred for resource-limited industrial controllers despite being marked Not Recommended for New Designs.

Availability

AT25010AY1-10YU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for AT25010AY1-10YU-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with broad industrial and automotive qualification capabilities.

The AT25010AY1-10YU-1.8 belongs to Microchip's legacy AT25010A serial EEPROM family, designed for low-power, low-voltage embedded systems requiring reliable nonvolatile storage with minimal pin count and board area.

FAQ

What is the maximum clock frequency supported by AT25010AY1-10YU-1.8 at 1.8 V?

The AT25010AY1-10YU-1.8 supports up to 5 MHz SCK frequency when operated at 1.8 V, as specified in Table 4 of the datasheet under the 1.8–5.5 V column. This is lower than its 20 MHz rating at 5 V, reflecting reduced timing margins at minimum supply. Designers must ensure setup/hold times (e.g., tSU ≥ 80 ns) are met at this speed using appropriate PCB layout and driver strength.

Does AT25010AY1-10YU-1.8 require an external pull-up resistor on the SO pin?

No, AT25010AY1-10YU-1.8 does not require an external pull-up on the SO pin. Its SO output is actively driven high or low during read operations and enters high-impedance state when CS is high or HOLD is asserted. External pull-ups may cause bus contention or increased power draw and are unnecessary per the functional description and timing diagrams.

How is block write protection configured on AT25010AY1-10YU-1.8?

Block write protection on AT25010AY1-10YU-1.8 is configured by writing BP1/BP0 bits in the status register using the WRSR instruction. These nonvolatile bits define four protection levels: 00 = none, 01 = 1/4 array (0x60–0x7F), 10 = 1/2 array (0x40–0x7F), or 11 = full array (0x00–0x7F). The WP pin must be high during WRSR execution, and protection takes effect immediately after write completion.

Can AT25010AY1-10YU-1.8 be used in automotive applications?

AT25010AY1-10YU-1.8 is rated for −40°C to +85°C operation and offered in automotive-grade variants (per ordering table notes), but the specific AT25010AY1-10YU-1.8 part number is not AEC-Q100 qualified. For automotive use, designers should select explicitly qualified versions such as AT25010A-10TU-1.8 with TSSOP packaging and automotive temperature screening, or verify qualification status directly with Microchip.

What happens if the WP pin is pulled low during an active write cycle on AT25010AY1-10YU-1.8?

If the WP pin is pulled low during an active write cycle on AT25010AY1-10YU-1.8, the device halts further programming and retains the partially written data state. However, per the datasheet, once the internal write cycle has initiated, WP going low has no effect-the write proceeds to completion. WP only prevents new write instructions (WREN, WRITE, WRSR) from being accepted while low; it does not abort in-progress cycles.