Microchip Technology 25AA080B-I/SNG

Overview

25AA080B-I/SNG from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1.8–5.5 V supply range, 32-byte page write capability, industrial temperature rating (–40°C to +85°C), and SOIC-8 package. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, reliable data retention for boot parameters, calibration data, or device settings.

For engineers reviewing the 25AA080B-I/SNG datasheet, 25AA080B-I/SNG pinout, 25AA080B-I/SNG application, or 25AA080B-I/SNG equivalent, key selection criteria include its 10 MHz max clock speed, hardware write protection via WP pin, HOLD functionality for interrupt-safe SPI pauses, and 1,000,000 erase/write endurance with >200-year data retention.

Technical Context

The 25AA080B-I/SNG 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 1024 × 8-bit EEPROM array, page latches supporting 32-byte burst writes, and a status register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN instruction before WRITE or WRSR commands; CS high after final data bit triggers self-timed 5 ms internal write cycle. HOLD pin suspends ongoing SPI sequences without resetting state, enabling host CPU to service higher-priority interrupts while preserving transaction context.

Key Specifications

Pinout & Package

25AA080B-I/SNG is packaged in an 8-lead narrow SOIC (SOIC-8, package code SN), measuring 4.90 mm × 3.90 mm × 1.75 mm, RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080B-I/SNG, the 25LC080B-I/SN sacrifices 1.8 V compatibility for marginal cost reduction, while the AT25080B-MAHL-T trades page size and register compatibility for higher clock speed-neither offers drop-in replacement without voltage or firmware validation.

Availability

25AA080B-I/SNG is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart home gateway firmware storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25AA080B-I/SNG 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 25AA080B-I/SNG belongs to Microchip's 25XX080A/B serial EEPROM product line, designed specifically for SPI-based nonvolatile storage in resource-constrained embedded systems demanding industrial reliability, low-voltage operation, and hardware-level data protection.

FAQ

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

The 25AA080B-I/SNG supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V. At lower supply voltages (2.5–4.5 V), the maximum clock drops to 5 MHz, and at 1.8–2.5 V, it is limited to 3 MHz. These deratings ensure setup/hold timing compliance across the full industrial temperature range (–40°C to +85°C). The 25AA080B-I/SNG datasheet specifies AC characteristics including TCSS, TCSH, and Tsu that must be met at each voltage tier.

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

The HOLD pin on the 25AA080B-I/SNG suspends ongoing SPI communication when pulled low while SCK is low, placing SI, SO, and SCK in high-impedance states without resetting internal state. The device retains its position in the instruction/address/data sequence and resumes exactly where it left off when HOLD returns high (also during SCK low). This allows the host MCU to service urgent interrupts without losing transaction context or requiring retransmission-critical for real-time embedded systems using the 25AA080B-I/SNG.

What page size does the 25AA080B-I/SNG use, and why does it matter for write efficiency?

The 25AA080B-I/SNG uses a 32-byte page size, meaning up to 32 bytes can be written in a single page write command provided they reside within the same physical page boundary (addresses aligned to 32-byte multiples). This reduces SPI overhead versus byte-wise writes-cutting transaction time by ~30× for full-page updates. However, crossing a page boundary causes wraparound instead of auto-advancing, so firmware must validate addresses before initiating page writes to avoid unintended data overwrites in the 25AA080B-I/SNG.

Can the 25AA080B-I/SNG be used in 1.8 V systems, and what are the key electrical considerations?

Yes, the 25AA080B-I/SNG is fully specified for 1.8–5.5 V operation, making it suitable for ultra-low-power 1.8 V systems such as battery-operated sensors. Key considerations include reduced max clock (3 MHz), adjusted input thresholds (VIH2 = 0.7×VCC, VIL2 = 0.2×VCC), and tighter AC timing margins (e.g., TCSS = 150 ns). Its 1 µA standby current at 2.5 V and >4000 V HBM ESD rating further support robust 1.8 V deployment. Always verify VCC stability and decoupling when operating the 25AA080B-I/SNG at minimum voltage.

How is write protection implemented in the 25AA080B-I/SNG, and what levels of security does it provide?

The 25AA080B-I/SNG implements dual-layer write protection: (1) Software-controlled block protection (BP0/BP1 bits) enabling 0%, 25%, 50%, or 100% array lockdown, and (2) Hardware-assisted Status Register protection via WP pin + WPEN bit. When WP is low and WPEN = 1, Status Register writes are blocked-preventing accidental modification of BP bits or WPEN itself. Memory array writes remain permitted unless BP bits are set. This layered approach ensures critical configuration data remains immutable in deployed systems using the 25AA080B-I/SNG.