Microchip Technology 25LC020A-H/SN

Overview

25LC020A-H/SN from Microchip Technology is a 2 kbit (256 × 8) SPI serial EEPROM with 16-byte page write capability, 2.5V–5.5V supply range, and extended temperature operation from –40°C to +150°C. It features hardware write protection (WP), hold functionality, and supports byte/page writes with self-timed 6 ms max internal write cycles - used for nonvolatile parameter storage in automotive engine control units.

For engineers reviewing the 25LC020A-H/SN datasheet, 25LC020A-H/SN pinout, 25LC020A-H/SN application, or 25LC020A-H/SN equivalent, key selection criteria include high-temp reliability (>200 years data retention, >1M endurance), SPI interface timing compliance at 5 MHz (down to 2.5V), and SOIC-8 package compatibility with legacy industrial PCB layouts.

Technical Context

The 25LC020A-H/SN implements a standard SPI Mode 0,0 (CPOL = 0, CPHA = 0) interface with separate SI and SO lines, requiring CS assertion, SCK synchronization, and optional HOLD suspension. Its memory array is organized as 256 × 8-bit with fixed 16-byte page boundaries, enforcing wraparound on page-crossing writes.

Write operations require explicit WREN instruction before each WRITE command, followed by CS deassertion to trigger the 6 ms internal erase/write cycle. The STATUS register provides real-time WIP and WEL status, while BP0/BP1 bits enable configurable block protection of 0%, 25%, 50%, or 100% of the array.

Key Specifications

Pinout & Package

25LC020A-H/SN is housed in an 8-lead SOIC (SN) package, Pb-free and RoHS compliant, with 3.90 mm body width and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC020A-H/SN, 25AA020A-I/SN extends voltage flexibility without sacrificing high-temp capability, while AT25020B-MAHL-T trades endurance and temperature rating for cost-sensitive non-automotive designs - neither is pin-compatible drop-in replacement due to differing qualification scope and endurance guarantees.

Availability

25LC020A-H/SN is available at Aetrix Electronics and suitable for automotive engine management, industrial PLC configuration, medical infusion pump calibration, and avionics sensor offset storage requiring stable component supply across extended temperature and high-reliability lifecycles.

Supply support for 25LC020A-H/SN 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including AEC-Q200 and ISO/TS 16949.

The 25LCXXXA family was designed specifically for high-reliability, extended-temperature SPI EEPROM applications in automotive, industrial, and medical systems where data integrity across extreme thermal cycles is mandatory.

FAQ

What is the maximum clock frequency supported by the 25LC020A-H/SN at 2.5V supply?

The 25LC020A-H/SN supports a maximum clock frequency of 3 MHz when VCC is between 2.5V and 4.5V, as specified in Table 1-2 of DS22136B. This ensures reliable SPI communication in low-voltage automotive or battery-powered systems while maintaining full timing margin at 150°C ambient.

Does the 25LC020A-H/SN require external pull-up resistors on its SPI lines?

No, the 25LC020A-H/SN does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS and WP should be pulled high via 10 kΩ resistors to VCC in most designs to ensure defined states during power-up and noise immunity, especially in electrically noisy automotive environments where the 25LC020A-H/SN is commonly deployed.

How does the HOLD function behave during an active write cycle in the 25LC020A-H/SN?

The HOLD function is disabled during an internal write cycle in the 25LC020A-H/SN. Once a write is initiated (via CS rising edge after valid command), the device ignores HOLD transitions until the 6 ms internal cycle completes. This prevents interruption of nonvolatile programming - a critical behavior for deterministic firmware update sequences using the 25LC020A-H/SN.

Can the 25LC020A-H/SN be used as a direct replacement for the 25LC020A-I/SN in existing designs?

No, the 25LC020A-H/SN is not a direct replacement for the 25LC020A-I/SN due to its extended temperature qualification (–40°C to +150°C vs. –40°C to +85°C) and associated process/test differences. While pinout and basic functionality match, thermal derating, reliability validation, and AEC-Q100 compliance apply only to the H-grade 25LC020A-H/SN - substituting it into an I-grade design requires revalidation of thermal margins and lifetime models.

What happens if a page write command crosses a 16-byte boundary in the 25LC020A-H/SN?

If a page write command attempts to cross a 16-byte boundary in the 25LC020A-H/SN, the internal address counter wraps around to the start of the current page, overwriting previously written bytes in that same page. This behavior is explicitly documented in Figure 3-1 and Section 3.3 - application firmware must enforce page-aligned writes or split multi-page transfers manually to avoid unintended data corruption in the 25LC020A-H/SN.