Microchip Technology 25LC020AT-E/MC

Overview

25LC020AT-E/MC 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 industrial/automotive temperature support (−40°C to +125°C). It features hardware write protection (WP pin), HOLD functionality for interrupt-safe serial pauses, and block-level array protection (none/¼/½/all). Used in embedded systems for parameter storage, calibration data retention, and firmware configuration in automotive control units.

For engineers reviewing the 25LC020AT-E/MC datasheet, 25LC020AT-E/MC pinout, 25LC020AT-E/MC application, or 25LC020AT-E/MC equivalent, key selection criteria include VCC range (2.5–5.5 V), endurance (1 million cycles), data retention (>200 years), SPI Mode 0/1 compatibility, and DFN-8 (2×3 mm) package suitability for space-constrained automotive PCBs.

Technical Context

The 25LC020AT-E/MC implements a standard SPI interface with separate SI (data in), SO (data out), SCK (clock), CS (chip select), WP (write-protect), and HOLD (serial 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.

Internally, it uses an 8-bit instruction register, page latches, and high-voltage generation circuitry for EEPROM programming. Write operations require WREN instruction followed by CS high transition to initiate self-timed internal write cycle (≤5 ms), while STATUS register (WIP/WEL/BP0/BP1 bits) enables real-time write-in-progress polling and configurable block protection.

Key Specifications

Pinout & Package

25LC020AT-E/MC is packaged in an 8-lead 2×3 mm DFN (Dual Flat No-lead) with exposed pad, RoHS-compliant and Pb-free. Pin 1 is marked by laser identifier; exposed pad may be connected to VSS or left floating per Microchip DS21833G-page 25.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC020AT-E/MC, the 25AA020AT-I/MC offers wider voltage flexibility but lacks automotive qualification, while AT25020B-MAHL-T provides identical electrical specs in a larger SOIC package-making the 25LC020AT-E/MC optimal for new automotive designs demanding compact, high-temp DFN integration.

Availability

25LC020AT-E/MC is available at Aetrix Electronics and suitable for automotive control units, ADAS sensor modules, body electronics, and infotainment systems requiring stable component supply with guaranteed lifecycle continuity.

Supply support for 25LC020AT-E/MC 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 requiring high-reliability, low-power, SPI-compatible nonvolatile memory with extended temperature operation and robust data integrity.

FAQ

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

The 25LC020AT-E/MC supports up to 10 MHz clock frequency when VCC is between 4.5 V and 5.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum clock frequency is 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it drops to 3 MHz. These limits are defined in Table 1-2 of the DS21833G datasheet and ensure reliable timing margin across automotive voltage and temperature ranges.

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

Yes, the 25LC020AT-E/MC supports page write mode with a fixed page size of 16 bytes. Up to 16 bytes can be written in a single transaction, provided they reside within the same physical page boundary (addresses ending in 0000–1111 binary). Crossing a page boundary causes wraparound, overwriting earlier bytes in the same page - firmware must enforce page-aligned writes.

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

The HOLD pin on the 25LC020AT-E/MC suspends ongoing SPI communication without resetting the sequence. To activate HOLD, the pin must be driven low while SCK is low; otherwise, activation waits until the next SCK high-to-low transition. Resume occurs when HOLD is brought high while SCK is low. During HOLD, SI/SO/SCK enter high-impedance, allowing host MCU to service higher-priority interrupts safely.

What write protection mechanisms does the 25LC020AT-E/MC provide?

The 25LC020AT-E/MC provides three-tiered write protection: (1) hardware WP pin (pin 3), which disables all writes when low; (2) write enable latch (WEL bit), set via WREN instruction and reset on power-up or WRDI; and (3) nonvolatile block protection bits (BP0/BP1) controlling write access to 0%, 25%, 50%, or 100% of the memory array. All three operate concurrently per Table 2-4.

Is the 25LC020AT-E/MC pin-compatible with other members of the 25XX020A family, such as the 25AA020A?

Yes, the 25LC020AT-E/MC shares identical pinout, package dimensions, and SPI protocol with all 25XX020A variants (including 25AA020A), as confirmed in the Pin Function Table and Package Types section of DS21833G. However, VCC range (2.5–5.5 V vs. 1.8–5.5 V) and temperature grade (Automotive E vs. Industrial I) differ - electrical compatibility must be verified per application voltage and thermal environment.