Microchip Technology 25LC080DT-I/ST

Overview

25LC080DT-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 features hardware write protection via WP pin and STATUS register control. It is used in microcontroller-based systems for nonvolatile parameter storage, calibration data retention, and firmware configuration.

For engineers reviewing the 25LC080DT-I/ST datasheet, 25LC080DT-I/ST pinout, 25LC080DT-I/ST application, or 25LC080DT-I/ST equivalent, key selection criteria include SPI interface compatibility, page-write capability (32 bytes), industrial-grade temperature operation, low standby current (1 µA at +85°C), and hardware/software write-protection flexibility.

Technical Context

The 25LC080DT-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. It uses internal high-voltage generation for EEPROM programming and includes a self-timed 5 ms max write cycle with automatic write-enable latch reset after completion.

Its STATUS register provides real-time visibility into WIP (Write-In-Process), WEL (Write Enable Latch), and BP0/BP1 block protection bits, enabling dynamic memory segmentation - protecting none, upper 1/4, upper 1/2, or full 8 Kbit array - without interrupting host communication.

Key Specifications

Pinout & Package

25LC080DT-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and Pb-free, optimized for space-constrained PCB layouts while maintaining hand-solderability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080DT-I/ST, the 25LC080D-I/SN offers identical electrical and functional behavior in a larger SOIC package, while AT25080B-SSHL-T omits HOLD support and requires voltage and protection logic validation - making the original TSSOP variant optimal for space-constrained, interrupt-aware industrial designs.

Availability

25LC080DT-I/ST is available at Aetrix Electronics and suitable for industrial control systems, smart sensor nodes, energy metering platforms, and motor drive firmware storage requiring stable component supply across extended product lifecycles.

Supply support for 25LC080DT-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 25LC080DT-I/ST belongs to Microchip's 25XX080C/D family of SPI Serial EEPROMs, engineered for robust, low-power nonvolatile data storage in resource-constrained embedded systems where reliability and SPI interoperability are critical.

FAQ

What is the maximum clock frequency supported by the 25LC080DT-I/ST?

The 25LC080DT-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5V–5.5V. At 2.5V–4.5V, the maximum clock drops to 5 MHz, and at 1.8V–2.5V it is 3 MHz - though the 25LC080DT-I/ST is not rated for 1.8V operation. These limits ensure setup/hold timing compliance per DS22151B AC specifications. The 25LC080DT-I/ST must meet TCSS, TCSH, and Tsu timing windows at the selected frequency and voltage.

Does the 25LC080DT-I/ST support page write operations, and what is its page size?

Yes, the 25LC080DT-I/ST supports page write operations with a fixed 32-byte page size, as confirmed by the 'D' suffix in its part number and Device Selection Table. Page writes allow up to 32 bytes to be loaded before initiating the internal write cycle, improving efficiency over byte-wise writes. However, page boundaries are strict: writing across a 32-byte boundary wraps data to the start of the same page rather than advancing - software must enforce alignment. This behavior is intrinsic to the 25LC080DT-I/ST architecture.

How does hardware write protection work on the 25LC080DT-I/ST?

Hardware write protection on the 25LC080DT-I/ST requires both the WP pin (Pin 3) to be low AND the WPEN bit (bit 7 of STATUS register) to be set high. When both conditions are met, writes to nonvolatile STATUS register bits (BP0, BP1, WPEN) are blocked - but memory array reads, writes, and volatile STATUS reads remain fully functional. The 25LC080DT-I/ST defaults with WPEN = 0 at power-up, so WP pin grounding alone has no effect until WPEN is explicitly written via WRSR.

What is the purpose of the HOLD pin on the 25LC080DT-I/ST, and how is it used?

The HOLD pin (Pin 7) on the 25LC080DT-I/ST suspends ongoing SPI communication without resetting the internal state, allowing the host MCU to service higher-priority interrupts and resume transmission from the exact point of pause. To activate HOLD, the pin must be pulled low while SCK is low; releasing HOLD while SCK is low resumes operation. During HOLD, SI, SCK, and SO enter high-impedance - preserving bus integrity. This feature is unique to the 25LC080DT-I/ST among pin-compatible alternatives like AT25080B.

What packaging and environmental ratings apply to the 25LC080DT-I/ST?

The 25LC080DT-I/ST is packaged in an 8-lead TSSOP (ST suffix), measuring 4.4 mm wide with 0.65 mm lead pitch, and is Pb-free and RoHS compliant. It is rated for the Industrial temperature range (−40°C to +85°C), with guaranteed operation across this span at VCC = 2.5V–5.5V. Its ESD rating exceeds 4 kV HBM, and data retention exceeds 200 years - validated per Microchip's characterization and testing protocols for the 25LC080DT-I/ST device family.