Microchip Technology 25LC080A-E/MS

Overview

25LC080A-E/MS from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page write capability, 10 MHz max clock frequency, and industrial-temperature operation (−40°C to +85°C). It serves as nonvolatile configuration storage in microcontroller-based systems requiring reliable, low-power data retention for boot parameters, calibration tables, or device identity.

For engineers reviewing the 25LC080A-E/MS datasheet, 25LC080A-E/MS pinout, 25LC080A-E/MS application, or 25LC080A-E/MS equivalent, key selection criteria include VCC range (2.5–5.5 V), page size (16 bytes), endurance (1,000,000 cycles), data retention (>200 years), and MSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The 25LC080A-E/MS implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and HOLD pin support for interrupt-safe pausing of serial transfers. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and hardware write protection via WP pin and WPEN bit.

It supports sequential read across address boundaries with automatic rollover at 03FFh, byte and page write operations constrained to 16-byte pages, and self-timed erase/write cycles completing in ≤5 ms. Block protection configures write-disable for none, upper 1/4, upper 1/2, or full memory array via BP0/BP1 bits.

Key Specifications

Pinout & Package

25LC080A-E/MS is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, 3.00 mm × 4.90 mm body, and Pb-free/RoHS-compliant construction. The package supports automated SMT assembly and offers thermal and mechanical performance suitable for industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080A-E/MS, 25AA080A-I/MS enables lower-voltage operation but lacks automotive temperature support, while AT25080B-MAU-10 adds AEC-Q100 qualification and faster clocking at the cost of register-level incompatibility.

Availability

25LC080A-E/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for 25LC080A-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080A-E/MS belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, designed specifically for robust, low-power nonvolatile storage in resource-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum clock frequency supported by the 25LC080A-E/MS?

The 25LC080A-E/MS supports a maximum SPI clock frequency of 10 MHz when VCC is 4.5 V to 5.5 V. At lower supply voltages (2.5 V ≤ VCC < 4.5 V), the maximum clock drops to 5 MHz, and at 1.8 V ≤ VCC < 2.5 V it is 3 MHz. These limits are defined in Table 1-2 of the DS21808D datasheet and directly impact data throughput in time-critical applications.

Does the 25LC080A-E/MS require external pull-up resistors on its SPI lines?

The 25LC080A-E/MS does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS and HOLD should be pulled high via 10 kΩ resistors to ensure defined states during power-up or MCU reset. WP may also require a pull-up if hardware protection is disabled, as an unconnected WP pin can float and cause unpredictable Status Register locking behavior.

How does page write operation work in the 25LC080A-E/MS?

A page write in the 25LC080A-E/MS allows up to 16 bytes to be loaded into the internal page buffer before initiating the internal write cycle. All bytes must reside within the same 16-byte physical page boundary (e.g., addresses 000h–00Fh); crossing the boundary causes wraparound to the start of the current page. The CS high-to-low transition after the final byte triggers the self-timed ≤5 ms write cycle.

Can the 25LC080A-E/MS be used in a 1.8 V system?

No - the 25LC080A-E/MS has a specified VCC range of 2.5 V to 5.5 V and is not guaranteed to operate reliably at 1.8 V. For 1.8 V systems, Microchip's 25AA080A-I/MS is the functionally equivalent part with identical pinout, page size, and memory density but rated for 1.8–5.5 V operation.

What happens to the write-enable latch during a power cycle of the 25LC080A-E/MS?

The write-enable latch in the 25LC080A-E/MS is automatically reset on power-up, ensuring that no write operations can occur until the host explicitly issues a WREN instruction. This behavior, combined with power-on data protection circuitry, prevents inadvertent writes during supply ramp-up or brownout conditions - a critical safety feature confirmed in Section 2.7 and 2.8 of the DS21808D datasheet.