Microchip Technology 25LC080D-I/ST

Overview

25LC080D-I/ST from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page size, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports up to 10 MHz clock frequency, and delivers 5 mA read/write current at 5.5V - ideal for firmware storage and configuration data retention in embedded control systems.

For engineers reviewing the 25LC080D-I/ST datasheet, 25LC080D-I/ST pinout, 25LC080D-I/ST application, or 25LC080D-I/ST equivalent, key selection criteria include SPI timing compliance (T_CSS, T_SU, T_WC), write-protection granularity (BP0/BP1 bits), HOLD functionality for interrupt-safe bus sharing, and Pb-free TSSOP-8 packaging compatibility with automated SMT assembly.

Technical Context

The 25LC080D-I/ST implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring only CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes a write-enable latch, nonvolatile STATUS register (WIP, WEL, BP0/BP1, WPEN), and page latches enabling 32-byte burst writes within aligned physical pages.

Hardware write protection is configurable via WP pin and WPEN bit, supporting four block-protection levels (none, upper 1/4, upper 1/2, or full array). The HOLD pin suspends ongoing serial transfers without resetting the sequence, allowing host microcontrollers to service higher-priority interrupts while preserving transaction state.

Key Specifications

Pinout & Package

25LC080D-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and optimized for high-density PCB layouts. Pin 1 is marked with a dot or beveled corner; package meets JEDEC MO-153 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080D-I/SN, the 25LC080D-I/ST offers 40% smaller PCB area and tighter pitch for miniaturized designs; versus AT25080B-SSHL-T, it trades 2× clock speed for proven industrial qualification and identical STATUS register behavior - simplifying migration from legacy 25LCxx designs.

Availability

25LC080D-I/ST is available at Aetrix Electronics and suitable for industrial control, motor drive configuration, and embedded firmware storage requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.

Supply support for 25LC080D-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 25LC080D-I/ST belongs to Microchip's 25XX080 family of SPI Serial EEPROMs, designed specifically for reliable, low-pin-count nonvolatile storage in cost-sensitive and space-constrained embedded systems where SPI interface simplicity and industrial-grade endurance are critical.

FAQ

What is the maximum clock frequency supported by the 25LC080D-I/ST, and how does it vary with supply voltage?

The 25LC080D-I/ST supports up to 10 MHz clock frequency when VCC is 4.5V to 5.5V, 5 MHz at 2.5V to <4.5V, and 3 MHz at 1.8V to <2.5V. Since the 25LC080D-I/ST is specified for 2.5V–5.5V operation, its maximum usable clock is 10 MHz at 5.5V and 5 MHz at 2.5V. These limits ensure setup/hold timing margins (e.g., T_SU = 10 ns min at 4.5–5.5V) are met across temperature and process corners.

How does the 32-byte page size of the 25LC080D-I/ST affect write operations compared to 16-byte page devices?

The 32-byte page size of the 25LC080D-I/ST allows up to 32 consecutive bytes to be loaded in a single page write command before requiring CS to go high and initiating the 5 ms internal write cycle. This doubles the burst length versus 16-byte-page variants (e.g., 25LC080C), reducing SPI transaction overhead by up to 50% for multi-byte writes - directly improving firmware update efficiency in the 25LC080D-I/ST.

Can the 25LC080D-I/ST be used in systems requiring hardware write protection independent of software control?

Yes. The 25LC080D-I/ST supports hardware write protection via the WP pin when the WPEN bit in its STATUS register is set to '1'. With WP held low and WPEN = 1, writes to the nonvolatile STATUS register bits (BP0/BP1/WPEN) are blocked - preventing accidental changes to protection settings even if firmware is compromised. This dual-layer protection is fully functional in the 25LC080D-I/ST without requiring continuous software supervision.

What is the purpose of the HOLD pin on the 25LC080D-I/ST, and what timing constraints apply?

The HOLD pin on the 25LC080D-I/ST pauses ongoing SPI communication without resetting the internal state, allowing the host MCU to service urgent interrupts. HOLD must be asserted while SCK is low; resuming requires HOLD to return high while SCK remains low. Timing constraints include minimum HOLD setup (T_HS = 20 ns @ 4.5–5.5V) and hold (T_HH = 20 ns) times - all rigorously defined in the 25LC080D-I/ST datasheet to guarantee deterministic behavior.

Is the 25LC080D-I/ST pin-compatible with other members of the 25XX080 family, such as the 25AA080D-I/ST?

Yes, the 25LC080D-I/ST is pin-compatible with all 25XX080C/D variants in the same package (e.g., 25AA080D-I/ST, 25LC080C-I/ST), sharing identical TSSOP-8 pinout, SPI protocol, and instruction set. However, voltage ranges differ: 25AA080D supports 1.8V–5.5V, while the 25LC080D-I/ST requires 2.5V–5.5V. Thus, direct substitution is electrically safe only if system VCC ≥ 2.5V - a key design consideration when selecting the 25LC080D-I/ST.