Microchip Technology 25AA080C-I/ST

Overview

25AA080C-I/ST 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 features hardware write protection (WP pin), HOLD suspend functionality, and industrial temperature operation (−40°C to +85°C) in an 8-lead TSSOP package. Used for nonvolatile configuration storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA080C-I/ST datasheet, 25AA080C-I/ST pinout, 25AA080C-I/ST application, or 25AA080C-I/ST equivalent, key selection criteria include SPI clock compatibility up to 10 MHz at 5.5 V, 5 µA standby current, self-timed 5 ms write cycle, and block-level write protection covering 0%, 25%, 50%, or 100% of memory.

Technical Context

The 25AA080C-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and SCK-synchronized transfers. Its internal architecture includes a write-enable latch, STATUS register with WIP/WEL/BP bits, and page latches enabling burst writes within 16-byte boundaries.

Hardware write protection is configurable via WP pin and WPEN bit in the STATUS register; HOLD pin allows mid-sequence suspension without resetting the SPI state machine. All operations - read, write, status access - are initiated by 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE) followed by 16-bit address and optional data bytes, all MSB-first.

Key Specifications

Pinout & Package

8-lead TSSOP (ST) package, 4.4 mm body width, 0.65 mm pitch, RoHS-compliant matte tin finish. Pin 1 marked by notch or dot; lead finish meets JEDEC J-STD-020 reflow requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080C-I/ST, the 25AA080C-I/ST extends voltage range down to 1.8 V for ultra-low-power MCUs, while AT25080B-SSHL-T offers higher clock rate but demands driver-level compatibility validation.

Availability

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

Supply support for 25AA080C-I/ST 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080C-I/ST belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage, SPI-based nonvolatile data storage in resource-constrained embedded systems.

FAQ

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

The 25AA080C-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V, 5 MHz at 2.5–4.5 V, and 3 MHz at 1.8–2.5 V. These AC timing limits are specified in Table 1-2 of the DS22151B datasheet and must be respected to ensure reliable data transfer across the full industrial temperature range.

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

No, the 25AA080C-I/ST 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 in most designs to ensure defined states during reset or floating conditions; HOLD may also benefit from a weak pull-up to prevent spurious suspension.

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

The 25AA080C-I/ST supports 16-byte page writes: up to 16 consecutive bytes can be loaded in one transaction, provided they reside entirely within the same 16-byte physical page (e.g., addresses 0x00–0x0F). Crossing a page boundary causes wraparound to the start of the current page, potentially overwriting prior data - software must enforce alignment.

Can the 25AA080C-I/ST be used in a 1.8 V system with full functionality?

Yes, the 25AA080C-I/ST is fully specified for 1.8–5.5 V operation across the industrial temperature range (−40°C to +85°C). At 1.8 V, it delivers 3 MHz max clock, 5 µA standby current, and retains all features including HOLD, WP, and block protection - confirmed in Tables 1-1, 1-2, and the Device Selection Table.

What happens to the 25AA080C-I/ST during power-up or brown-out conditions?

On power-up, the 25AA080C-I/ST enters Standby mode with CS high, SO in high-impedance, and the write enable latch reset - preventing unintended writes. The built-in power-on/off data protection circuitry ensures STATUS register integrity and blocks writes until WREN is explicitly issued, safeguarding memory contents during unstable supply conditions.