Microchip Technology 25LC080A-I/STG

Overview

25LC080A-I/STG from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, 10 MHz max clock frequency, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports hardware write protection via WP pin, and is used for nonvolatile parameter storage in microcontroller-based embedded systems.

For engineers reviewing the 25LC080A-I/STG datasheet, 25LC080A-I/STG pinout, 25LC080A-I/STG application, or 25LC080A-I/STG equivalent, key selection criteria include SPI interface compatibility, page-write timing (5 ms), VCC voltage range, industrial-grade reliability (1M endurance cycles, >200-year data retention), and TSSOP-8 package footprint constraints.

Technical Context

The 25LC080A-I/STG implements a standard SPI Mode 0,0/Master-Slave interface with separate SI and SO lines, CS-controlled selection, and HOLD pin for transaction suspension. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and page latches enabling up to 16-byte burst writes within a single physical page boundary.

It features dual-level write protection: software-configurable block protection (BP0/BP1) for 0%, 25%, 50%, or 100% array coverage, and hardware protection enabled only when WPEN=1 and WP pin is low. Power-on reset clears the write-enable latch and places SO in high-impedance state.

Key Specifications

Pinout & Package

25LC080A-I/STG is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 4.4 mm body width, and lead-to-lead width of 6.4 mm - optimized for space-constrained PCB layouts while maintaining hand-solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080A-I/STG, 25AA080A-I/STG extends low-voltage operation without sacrificing industrial temp rating, while AT25080B-SSHL-T trades Microchip's BP granularity for faster clocking and alternate protection logic - both require validation of write-cycle timing and status register interaction in target firmware.

Availability

25LC080A-I/STG is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and IoT edge node identity storage requiring stable component supply across multi-year production cycles.

Supply support for 25LC080A-I/STG 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 25LC080A-I/STG belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-pin-count nonvolatile storage in cost-sensitive and space-constrained embedded systems requiring SPI interface simplicity and industrial-grade endurance.

FAQ

What is the maximum SPI clock frequency supported by the 25LC080A-I/STG?

The 25LC080A-I/STG supports a maximum SPI clock frequency of 10 MHz when VCC is 4.5V to 5.5V. At lower supply voltages (2.5V ≤ VCC < 4.5V), the maximum clock drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V it is 3 MHz - though the 25LC080A-I/STG is not rated for operation below 2.5V. These limits ensure reliable setup/hold timing for SI and SO signals as specified in Table 1-2 of the DS21808D datasheet.

Does the 25LC080A-I/STG support page write operations, and what is the page size?

Yes, the 25LC080A-I/STG supports page write operations with a fixed page size of 16 bytes. Page writes allow up to 16 consecutive bytes to be loaded into the internal page latch before initiating the internal 5 ms write cycle. Attempting to cross a 16-byte boundary during a single page write causes data to wrap within the current page - this behavior is inherent to the 25LC080A-I/STG's architecture and must be managed in host firmware.

How does hardware write protection work on the 25LC080A-I/STG?

Hardware write protection on the 25LC080A-I/STG requires both the WPEN bit (bit 7 of Status Register) to be set to '1' and the WP pin (Pin 3) to be driven low. When enabled, this configuration blocks writes to the nonvolatile bits of the Status Register only - memory array writes remain permitted unless BP0/BP1 bits are also set. The 25LC080A-I/STG ignores WP state if WPEN=0, allowing full register access even with WP grounded.

What package type is used for the 25LC080A-I/STG, and what are its key mechanical dimensions?

The 25LC080A-I/STG uses an 8-lead TSSOP package (package code 'ST'), with 0.65 mm lead pitch, 4.4 mm body width (E1), 3.0 mm body length (D), and overall width of 6.4 mm (E). Its standoff height (A1) ranges from 0.05 mm to 0.15 mm, and molded thickness (A2) is 0.80–1.05 mm - making it suitable for compact, high-density PCB layouts while maintaining compatibility with standard reflow profiles.

Is the 25LC080A-I/STG RoHS compliant and Pb-free?

Yes, the 25LC080A-I/STG is Pb-free and RoHS compliant, as confirmed in the Device Selection Table and Packaging Information section of the DS21808D datasheet. Microchip marks Pb-free packages with the JEDEC-standard "e3" designation, and the 25LC080A-I/STG meets all requirements of Directive 2011/65/EU, including maximum allowable concentrations of lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE.