Microchip Technology 25LC080A-I/P

Overview

25LC080A-I/P from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and 2.5–5.5 V supply range. It features hardware write protection via WP pin, HOLD functionality for interrupt-safe SPI pauses, and operates across -40°C to +85°C industrial temperature range in 8-lead PDIP package. Used for firmware storage, calibration data retention, and configuration memory in microcontroller-based embedded systems.

For engineers reviewing the 25LC080A-I/P datasheet, 25LC080A-I/P pinout, 25LC080A-I/P application, or 25LC080A-I/P equivalent, key selection criteria include SPI clock support up to 10 MHz at 4.5–5.5 V, 5 ms max internal write cycle time, 1,000,000 erase/write endurance, and block-level write protection covering none/¼/½/all of the array.

Technical Context

The 25LC080A-I/P implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI and SO lines, requiring CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes an 8-bit instruction register, status register with WIP/WEL/BP0/BP1 bits, and page latches enabling 16-byte page writes within aligned boundaries.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed 5 ms internal write cycle; reads support sequential addressing with automatic address roll-over from 03FFh to 0000h. Hardware write protection engages only when WPEN bit is set and WP pin is low, leaving all other functions fully operational.

Key Specifications

Pinout & Package

8-lead PDIP (Plastic Dual In-Line Package), 300 mil body width, through-hole mounting compatible with legacy prototyping and wave soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080A-I/P, the 25LC080A-I/P provides stricter VCC regulation (2.5–5.5 V) and industrial temperature qualification, while AT25080B-PU adds speed and deeper sleep modes - all share identical PDIP-8 footprint and basic SPI command set.

Availability

25LC080A-I/P 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 production lifecycles.

Supply support for 25LC080A-I/P 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 25LC080A-I/P belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, designed specifically for reliable, low-pin-count nonvolatile storage in resource-constrained embedded systems requiring simple firmware integration and robust data integrity.

FAQ

What is the maximum SPI clock frequency supported by the 25LC080A-I/P?

The 25LC080A-I/P 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 values are specified in Table 1-2 AC Characteristics and define the upper limit for reliable read/write timing margins under corresponding supply conditions. The 25LC080A-I/P must be operated within these voltage-dependent limits to ensure setup/hold time compliance per DS21808D-page 3.

How does the HOLD pin function during an active SPI transaction on the 25LC080A-I/P?

The HOLD pin on the 25LC080A-I/P suspends ongoing SPI communication without resetting the sequence: when pulled low while SCK is low, SI/SO/SCK inputs are ignored and SO enters high-impedance state, allowing the host MCU to service higher-priority interrupts. To resume, HOLD must be raised while SCK remains low. This behavior is documented in Section 3.6 and Figure 1-1 of DS21808D, ensuring deterministic pause/resume timing for real-time systems.

Can the 25LC080A-I/P be used in systems powered by 3.3 V logic rails?

Yes, the 25LC080A-I/P operates reliably across 2.5–5.5 V, making it fully compatible with standard 3.3 V logic interfaces. Its input thresholds (VIH1 = 2.0 V min, VIL1 = 0.8 V max at VCC ≥ 2.7 V) and output drive strength (VOL = 0.4 V max at 2.1 mA) meet 3.3 V CMOS level requirements. DC Characteristics in Table 1-1 and AC timing in Table 1-2 confirm functional operation at 3.3 V, including 6.5 MHz max clock rate per interpolation from DS21808D-page 3.

What write protection mechanisms are implemented in the 25LC080A-I/P?

The 25LC080A-I/P implements three layered write protections: (1) software-controlled via WREN/WRDI instructions and WEL bit, (2) status-register-based block protection (BP0/BP1) enabling 0%/25%/50%/100% array lock, and (3) hardware-enabled protection using WP pin + WPEN bit. As detailed in Tables 2-3 and 2-4, WP only affects Status Register writes when WPEN=1; memory writes remain unrestricted unless BP bits are set. All mechanisms coexist and are independently configurable.

Is the 25LC080A-I/P pin-compatible with other 8-pin SPI EEPROMs like the AT25080 series?

The 25LC080A-I/P shares identical 8-lead PDIP pinout (CS/SO/WP/VSS/SI/SCK/HOLD/VCC) and SPI command set (READ/WRITE/RDSR/WRSR/WREN/WRDI) with AT25080B-PU, enabling direct PCB substitution in many cases. However, differences exist in timing parameters (e.g., AT25080B supports 20 MHz vs. 10 MHz), hold time requirements, and deep power-down capability. Full drop-in replacement requires validation of AC timing margins and firmware-level status register handling per respective datasheets.