Microchip Technology 25AA080C-I/MS

Overview

25AA080C-I/MS from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and 1.8–5.5 V supply range. It supports up to 10 MHz clock frequency, delivers 5 mA read/write current at 5.5 V, and operates across –40°C to +85°C industrial temperature range in an 8-lead MSOP package. It serves as nonvolatile configuration storage in microcontroller-based embedded systems requiring reliable, low-power data retention.

For engineers reviewing the 25AA080C-I/MS datasheet, 25AA080C-I/MS pinout, 25AA080C-I/MS application, or 25AA080C-I/MS equivalent, key selection criteria include SPI interface compatibility, 16-byte page write constraint, hardware write-protection via WP pin and STATUS register, HOLD functionality for interrupt-safe bus arbitration, and industrial-grade temperature operation without voltage derating.

Technical Context

The 25AA080C-I/MS implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI (MOSI) and SO (MISO) lines, CS-controlled device selection, and SCK-synchronized data transfer on rising/falling edges respectively. Its internal architecture includes a write-enable latch, 8-bit instruction register, and STATUS register with WIP, WEL, BP0/BP1, and WPEN bits for configurable block protection.

It supports byte and page write operations (max 16 bytes per page), self-timed internal write cycles ≤5 ms, sequential read with automatic address increment, and HOLD pin suspension of ongoing serial transfers while preserving internal state - enabling host MCU interrupt servicing without reinitialization.

Key Specifications

Pinout & Package

25AA080C-I/MS is housed in an 8-lead MSOP (150 mil) package, measuring 3.0 mm × 4.4 mm × 1.0 mm (max height), with gull-wing leads and Pb-free RoHS-compliant finish. The package supports surface-mount reflow assembly and provides thermal and mechanical reliability for industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080C-I/MS, the 25LC080C-I/MS requires higher minimum VCC and changes page size, while the AT25080B-MAHL-T omits HOLD and redefines write-protection control - making 25AA080C-I/MS uniquely suited for 1.8 V industrial systems needing deterministic bus suspension and flexible hardware/software protection layers.

Availability

25AA080C-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 25AA080C-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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080C-I/MS belongs to Microchip's 25XX080 family of SPI Serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in cost-sensitive, space-constrained embedded systems operating across industrial temperature ranges.

FAQ

What is the maximum clock frequency supported by the 25AA080C-I/MS?

The 25AA080C-I/MS supports up to 10 MHz SPI clock frequency when VCC is 4.5 V to 5.5 V. At 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 limited to 3 MHz. These graded limits ensure timing margin compliance across the full 1.8–5.5 V supply range, and all values are specified in the AC Characteristics table of the DS22151B datasheet.

Does the 25AA080C-I/MS require external pull-up resistors on its SPI lines?

The 25AA080C-I/MS does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS, WP, and HOLD are CMOS inputs with no internal pull-up/down; external pull-up resistors (typically 4.7–10 kΩ to VCC) are recommended for robust noise immunity in electrically noisy industrial environments, especially when those pins are controlled by open-drain or high-impedance MCU GPIOs.

How does page write operation work in the 25AA080C-I/MS?

The 25AA080C-I/MS has a 16-byte page buffer. A page write transfers up to 16 bytes starting from an address aligned to a 16-byte boundary (e.g., 0000h, 0010h). If the address or byte count crosses a page boundary, data wraps to the start of the same page instead of advancing - potentially overwriting earlier bytes. Software must validate address alignment before issuing WRITE commands to prevent unintended corruption.

Can the 25AA080C-I/MS be used in a 1.8 V system without level shifters?

Yes, the 25AA080C-I/MS is fully specified for 1.8–5.5 V operation, including DC and AC characteristics down to 1.8 V. Its VIH threshold scales to 0.7×VCC, and VOL remains ≤0.2 V at 1.0 mA load - ensuring interoperability with 1.8 V logic families without level translation. This makes 25AA080C-I/MS ideal for battery-powered or mixed-voltage embedded designs.

What happens to the write-enable latch during a power cycle of the 25AA080C-I/MS?

The write-enable latch in the 25AA080C-I/MS resets automatically on power-up, preventing accidental writes during brown-out or incomplete reset sequences. This behavior is hardwired and independent of the STATUS register. To perform any write operation, the host MCU must explicitly issue the WREN instruction after power stabilization - a safety mechanism confirmed in Section 2.4 and Table 2-4 of the DS22151B datasheet.