Microchip Technology AT25020A-10TU-2.7

Overview

AT25020A-10TU-2.7 from Microchip Technology (formerly Atmel) is a 2-Kbit SPI serial EEPROM organized as 256 words × 8 bits, operating from 2.7V to 5.5V, supporting 20 MHz clock rate at 5V, featuring 8-byte page write mode and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial control modules requiring low-voltage operation and high data retention.

For engineers reviewing the AT25020A-10TU-2.7 datasheet, AT25020A-10TU-2.7 pinout, AT25020A-10TU-2.7 application, or AT25020A-10TU-2.7 equivalent, key selection criteria include VCC range (2.7–5.5V), 20 MHz max SCK frequency at 5V, 5 ms max write cycle time, block write protection levels (1/4, 1/2, full array), and TSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The AT25020A-10TU-2.7 implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI (input) and SO (output) pins for full-duplex communication. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 for nonvolatile block protection, and automatic address increment during page writes.

It supports self-timed internal write cycles without external erase commands, uses CS for device selection and HOLD to suspend ongoing transfers without resetting sequence state, and enforces write inhibition when WP is low or WEN bit is unset - all verified under industrial temperature range (−40°C to +85°C).

Key Specifications

Pinout & Package

AT25020A-10TU-2.7 is supplied in an 8-lead Thin Shrink Small Outline Package (TSSOP), 0.170" wide, RoHS-compliant and green-packaged ("U" suffix), with 0.65 mm lead pitch and JEDEC MO-153 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-DWDW and BR25G256FJ-3GE2, the AT25020A-10TU-2.7 provides optimal balance of 2.7V compatibility, industrial temperature rating, and drop-in TSSOP-8 integration - making it ideal for cost-sensitive, space-constrained 3.3V/5V mixed-signal systems where 2Kbit suffices.

Availability

AT25020A-10TU-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for AT25020A-10TU-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 memory solutions, with broad industrial and automotive qualification coverage.

The AT25020A-10TU-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power nonvolatile data storage in resource-constrained embedded systems with SPI host interfaces.

FAQ

What is the memory organization of the AT25020A-10TU-2.7?

The AT25020A-10TU-2.7 contains 2048 bits of serial EEPROM memory organized as 256 words × 8 bits. This structure allows byte-aligned access and supports sequential reads/writes across the entire array. The AT25020A-10TU-2.7 uses an internal address counter that auto-increments during continuous read or page write operations, simplifying firmware implementation for bulk data transfers.

Does the AT25020A-10TU-2.7 support both SPI Mode 0 and Mode 3?

Yes, the AT25020A-10TU-2.7 supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), enabling interoperability with a wide range of microcontrollers. The AT25020A-10TU-2.7 datasheet explicitly describes Mode 0 operation but confirms Mode 3 compatibility in its features list, allowing designers to match host controller requirements without protocol conversion.

How does the write protection work on the AT25020A-10TU-2.7?

The AT25020A-10TU-2.7 implements dual-layer write protection: hardware-based via the WP pin (low disables all writes), and software-configurable via BP1/BP0 bits in the status register to protect 0%, 25%, 50%, or 100% of the memory array. The AT25020A-10TU-2.7 requires both WREN instruction execution and WP = high to perform writes, ensuring robust data integrity against accidental or malicious modification.

What is the maximum clock frequency supported by the AT25020A-10TU-2.7 at 3.3V?

At VCC = 3.3V, the AT25020A-10TU-2.7 supports a maximum SCK frequency of 10 MHz, as specified in Table 4 of the datasheet under the 2.7–5.5V voltage column. This ensures reliable timing margins for SPI communication in standard 3.3V embedded systems, with setup/hold times fully characterized across the industrial temperature range.

Is the AT25020A-10TU-2.7 qualified for automotive applications?

No - the AT25020A-10TU-2.7 is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. While automotive-grade variants exist in the AT25xxx family (e.g., AT25020AN-10SU-2.7 with "N" suffix), the AT25020A-10TU-2.7 is intended for industrial, medical, and consumer applications where extended temperature operation is required but automotive qualification is not mandated.