Microchip Technology 25AA080B-I/MS

Overview

25AA080B-I/MS from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page write capability, 1.8–5.5 V supply range, and industrial temperature rating (−40°C to +85°C). It operates up to 10 MHz on the SPI bus and delivers 1,000,000 erase/write cycles with >200 years data retention-used for firmware storage, calibration data logging, and configuration memory in embedded control systems.

For engineers reviewing the 25AA080B-I/MS datasheet, 25AA080B-I/MS pinout, 25AA080B-I/MS application, or 25AA080B-I/MS equivalent, this page provides verified electrical specs, MSOP-8 package details, HOLD/CS/WP interface behavior, endurance and timing validation, and real-world substitution guidance for industrial design-in.

Technical Context

The 25AA080B-I/MS implements a standard SPI Mode 0,0/Master-Slave interface with separate SI/SO lines, CS-controlled selection, and hardware HOLD suspension. Its internal architecture includes a 32-byte page latch, nonvolatile status register (WIP/WEL/BP0/BP1), and high-voltage generator for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high transition to initiate self-timed 5 ms internal write cycle; block protection supports configurable 0%, 25%, 50%, or 100% array write-disable via BP bits and WP pin + WPEN bit interaction.

Key Specifications

Pinout & Package

25AA080B-I/MS is housed in an 8-lead MSOP (Micro Small Outline Package), 3.0 mm × 4.9 mm body, 0.65 mm pitch, RoHS-compliant and Pb-free. Pin 1 is marked with a dot or beveled corner per Microchip Drawing C04-111B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080B-I/MS, 25AA080T-I/MS offers identical functionality in tape-and-reel form, while AT25080B-MAHL-T trades industrial temperature support for lower unit cost-making the original part essential for thermally demanding embedded applications.

Availability

25AA080B-I/MS is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration memory, and automotive body control module designs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25AA080B-I/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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 25AA080B belongs to Microchip's serial EEPROM product line, engineered for reliable nonvolatile data storage in resource-constrained embedded systems requiring SPI compatibility, low-voltage operation, and industrial-grade reliability.

FAQ

What is the maximum clock frequency supported by the 25AA080B-I/MS?

The 25AA080B-I/MS supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V. At 2.5–4.5 V, max clock drops to 5 MHz, and at 1.8–2.5 V, it is limited to 3 MHz. These values are specified in Table 1-2 of DS21808D and reflect guaranteed timing margins across the industrial temperature range.

Does the 25AA080B-I/MS support page write across address boundaries?

No-the 25AA080B-I/MS enforces strict 32-byte page boundaries. If a page write crosses a boundary (e.g., writing 32 bytes starting at address 0x03E0), data wraps to the start of the same page (0x03E0), overwriting earlier bytes instead of advancing to the next page. Application firmware must validate address alignment before initiating page writes.

How does the HOLD pin function during an active SPI transaction on the 25AA080B-I/MS?

When HOLD is pulled low while SCK is low, the 25AA080B-I/MS immediately suspends SPI communication: SI, SO, and SCK inputs are ignored except CS, and SO enters high-impedance. Resuming requires HOLD high while SCK remains low-then the transaction continues from the exact bit position where it paused, with no reinitialization needed.

What is the role of the WP pin and WPEN bit in the 25AA080B-I/MS status register?

In the 25AA080B-I/MS, WPEN (bit 7 of Status Register) enables hardware write protection: when WPEN = 1 and WP pin = low, writes to the nonvolatile Status Register are blocked-but memory array reads/writes remain fully functional. If WPEN = 0, the WP pin has no effect, allowing full SR access regardless of WP state.

Is the 25AA080B-I/MS compatible with 1.8 V microcontrollers?

Yes-the 25AA080B-I/MS operates down to 1.8 V VCC and specifies VIH1 = 2.0 V (min) and VIL2 = 0.2 × VCC (max) at VCC < 2.7 V, ensuring reliable logic-level recognition from 1.8 V GPIOs. Its 1.8–5.5 V range makes it interoperable with both legacy 5 V and modern ultra-low-voltage MCUs without level-shifting.