Microchip Technology 25LC020AT-E/MS

Overview

25LC020AT-E/MS from Microchip Technology Inc. is a 2 Kbit (256 × 8) SPI Serial EEPROM with 16-byte page write capability, 10 MHz max clock frequency at 4.5–5.5 V, and automotive-grade temperature support (−40°C to +125°C). It features hardware write protection via WP pin, HOLD input for interrupt-safe pausing, and block-level array protection (none/¼/½/all). Used in automotive control modules for calibration storage and fault log retention.

For engineers reviewing the 25LC020AT-E/MS datasheet, 25LC020AT-E/MS pinout, 25LC020AT-E/MS application, or 25LC020AT-E/MS equivalent, key selection criteria include VCC range (2.5–5.5 V), endurance (1,000,000 cycles), data retention (>200 years), SPI Mode 0/1 compatibility, and MSOP-8 package footprint constraints.

Technical Context

The 25LC020AT-E/MS implements a standard SPI interface with separate SI (data in), SO (data out), SCK (clock), CS (chip select), WP (write-protect), and HOLD (pause) signals. It operates in SPI Modes 0,0 and 1,1 per Figure 1-2 and Figure 1-3, with timing validated across VCC = 2.5–5.5 V and TA = −40°C to +125°C.

Internal architecture includes an 8-bit instruction register, status register (WIP/WEL/BP0/BP1), page latches, and high-voltage generator for EEPROM programming. Write operations require WREN instruction followed by CS high transition to initiate self-timed internal write cycle (≤5 ms), with automatic WEL reset upon completion.

Key Specifications

Pinout & Package

25LC020AT-E/MS is packaged in an 8-lead MSOP (Mini Small Outline Package), 3.0 mm × 4.9 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 location confirmed per DS21833G-page 30 top-view diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC020AT-E/MS, the 25AA020AT-I/MS offers broader voltage flexibility but lacks automotive temperature qualification, while the AT25020B-MAHL-T omits HOLD and delivers lower performance at minimum VCC - making 25LC020AT-E/MS the sole choice for safety-critical, interrupt-sensitive automotive SPI EEPROM needs.

Availability

25LC020AT-E/MS is available at Aetrix Electronics and suitable for automotive control units, ADAS sensor modules, and body electronics requiring stable component supply with AEC-Q100-aligned reliability and long-term traceability.

Supply support for 25LC020AT-E/MS 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 Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC020A family is designed specifically for automotive and industrial applications demanding high reliability, extended temperature operation, and robust SPI EEPROM functionality in space-constrained layouts.

FAQ

What is the maximum clock frequency supported by the 25LC020AT-E/MS?

The 25LC020AT-E/MS supports up to 10 MHz clock frequency when VCC is between 4.5 V and 5.5 V. At 2.5–4.5 V, the maximum clock drops to 5 MHz, and at 1.8–2.5 V (not applicable to this E-grade part), it is 3 MHz. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing across temperature.

Does the 25LC020AT-E/MS support page write operations, and what is the page size?

Yes, the 25LC020AT-E/MS supports page write mode with a fixed page size of 16 bytes. Up to 16 bytes can be loaded into the page buffer before initiating the internal write cycle (TWC ≤ 5 ms). Writes crossing a 16-byte boundary wrap within the current page - software must enforce alignment to avoid unintended overwrites.

How does the HOLD pin function on the 25LC020AT-E/MS, and what are its timing requirements?

The HOLD pin on the 25LC020AT-E/MS pauses ongoing SPI communication without resetting the transaction. To activate HOLD, it must be driven low while SCK is low; to resume, it must be raised high while SCK remains low. During HOLD, SI, SO, and SCK enter high-impedance states, allowing the host MCU to service interrupts safely.

What write protection mechanisms are implemented in the 25LC020AT-E/MS?

The 25LC020AT-E/MS implements three-tier write protection: (1) hardware WP pin (pin 3) - disables all writes when low; (2) write enable latch (WEL bit) - must be set via WREN instruction before each write; (3) block protection bits (BP0/BP1) - configure 0%, 25%, 50%, or 100% array protection via WRSR instruction. All are active simultaneously.

Is the 25LC020AT-E/MS pin-compatible with other members of the 25XX020A family?

Yes, the 25LC020AT-E/MS shares identical pinout and electrical behavior with all 25XX020A variants (e.g., 25AA020A, 25LC020A) in the same package type (MSOP-8). The "T-E/MS" suffix confirms MSOP-8 packaging and Automotive E-grade temperature range, ensuring mechanical and functional interchangeability where environmental specs align.