Microchip Technology AT25020AY1-10YU-1.8

Overview

AT25020AY1-10YU-1.8 from Microchip Technology (formerly Atmel) is a 2-Kbit SPI serial EEPROM organized as 256 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 hardware/software write protection. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring low-voltage operation and high reliability.

For engineers reviewing the AT25020AY1-10YU-1.8 datasheet, AT25020AY1-10YU-1.8 pinout, AT25020AY1-10YU-1.8 application, or AT25020AY1-10YU-1.8 equivalent, this page delivers verified electrical specs, JEDEC-compliant 8-lead Ultra Thin mini-MAP (MLP 2×3) package details, SPI Mode 0/3 timing compliance, 1 million write cycles endurance, and real-world use cases in automotive-grade sensor calibration and embedded firmware parameter retention.

Technical Context

The AT25020AY1-10YU-1.8 implements a synchronous slave SPI interface with dedicated SI/SO pins, CS-controlled selection, and HOLD/ WP pins for suspend and hardware write inhibit. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 block protection bits, and automatic address increment during page writes.

It supports dual voltage operation (1.8–5.5 V), self-timed 5 ms max write cycles, and four levels of array protection (none, 1/4, 1/2, or full). The device powers up in write-disabled state and requires explicit WREN before programming - all operations are MSB-first with CS falling-edge initiation.

Key Specifications

Pinout & Package

AT25020AY1-10YU-1.8 uses an 8-lead Ultra Thin mini-MAP (MLP 2×3 mm, 0.5 mm pitch, dual no-lead DFN) package per JEDEC MO-229, with exposed thermal pad. Pin 1 index located at bottom-left corner when viewed from top with marking side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-DRMN6TP/K and AT25SF041-SSHD-B, the AT25020AY1-10YU-1.8 offers optimal balance of low-voltage operation, deterministic 5 ms writes, HOLD-enabled transaction pausing, and MLP 2×3 mm footprint - making it superior for compact, real-time embedded systems needing frequent small-parameter updates.

Availability

AT25020AY1-10YU-1.8 is available at Aetrix Electronics and suitable for industrial control systems, automotive sensor modules, and medical device calibration requiring stable component supply and long-term lifecycle support.

Supply support for AT25020AY1-10YU-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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for legacy Atmel serial EEPROMs including the AT25020A family.

The AT25020A series was designed for low-power, low-voltage embedded systems requiring robust nonvolatile storage - especially in automotive, industrial, and medical applications where reliability and extended temperature operation are mandatory.

FAQ

What is the exact memory organization of the AT25020AY1-10YU-1.8?

The AT25020AY1-10YU-1.8 contains 2048 bits of serial EEPROM organized as 256 words × 8 bits. This structure supports byte-level random reads and writes, with automatic address increment during sequential operations. The memory map is divided into four equal blocks (00h–3Fh, 40h–7Fh, 80h–BFh, C0h–FFh) for configurable block write protection via the status register BP1/BP0 bits.

Does the AT25020AY1-10YU-1.8 support SPI Mode 3 (CPOL=1, CPHA=1)?

Yes, the AT25020AY1-10YU-1.8 explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in the Features section of the datasheet. The device operates as a slave with dedicated SI/SO pins and requires proper clock polarity and phase alignment per selected mode - Mode 0 is described in detail in the data sheet, but Mode 3 functionality is fully implemented and tested.

What does "Not recommended for new designs" mean for the AT25020AY1-10YU-1.8?

"Not recommended for new designs" indicates Microchip advises against selecting AT25020AY1-10YU-1.8 for newly initiated projects due to planned obsolescence or newer alternatives (e.g., AT25DF041 or 25AA256). However, the AT25020AY1-10YU-1.8 remains fully manufactured, supported, and available for existing designs, with guaranteed supply through Aetrix Electronics' lifecycle management program.

How does the HOLD pin function during an active SPI transaction on the AT25020AY1-10YU-1.8?

The HOLD pin on the AT25020AY1-10YU-1.8 suspends serial communication without resetting the internal state machine: when asserted low while SCK is low, it freezes data transfer at the current bit position; deassertion (HOLD high) while SCK remains low resumes exactly where paused. This enables safe CPU interrupt handling or multi-master arbitration - unlike CS deassertion, HOLD preserves address and instruction context across suspension.

Can the AT25020AY1-10YU-1.8 be used in a 1.8 V-only system without level shifting?

Yes, the AT25020AY1-10YU-1.8 is fully specified for 1.8 V operation (VCC = 1.8 V to 5.5 V), with guaranteed AC/DC performance including 5 MHz max clock rate, valid input thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), and output drive strength at 1.8 V. No level shifting is required when interfacing with 1.8 V microcontrollers - simply tie WP and HOLD to VCC or GND as needed and use appropriate pull-ups if open-drain signaling is employed.