Microchip Technology 25LC010A-E/ST

Overview

25LC010A-E/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8) SPI-compatible serial EEPROM with 16-byte page write capability, 10 MHz max clock frequency, and automotive-grade temperature support (−40°C to +125°C). It features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and block-level array protection (none/¼/½/all). Used in automotive control modules for storing calibration data, configuration settings, and fault logs.

For engineers reviewing the 25LC010A-E/ST datasheet, 25LC010A-E/ST pinout, 25LC010A-E/ST application, or 25LC010A-E/ST equivalent, key selection criteria include VCC range (2.5–5.5 V), endurance (1,000,000 cycles), data retention (>200 years), SPI timing compliance, and automotive qualification per E-temp grade.

Technical Context

The 25LC010A-E/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high transition to initiate self-timed internal write cycle (≤5 ms). The STATUS register provides real-time WIP and WEL status, while BP0/BP1 bits enable nonvolatile block protection of memory segments - all accessible via RDSR/WRSR commands.

Key Specifications

Pinout & Package

25LC010A-E/ST is packaged in 8-lead TSSOP (ST) with exposed pad, pin-compatible with industry-standard SOIC-8 footprint but offering reduced height and improved thermal performance. Pin mapping follows JEDEC MS-012AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25010B-SSHL-T and BR25G010FJ-WE2, the 25LC010A-E/ST uniquely balances automotive qualification, HOLD functionality for deterministic interrupt handling, and TSSOP-8 packaging for space-constrained ECU designs - making it optimal where bus arbitration robustness and form factor are primary constraints.

Availability

25LC010A-E/ST is available at Aetrix Electronics and suitable for automotive control units, ADAS sensor modules, and transmission management systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for 25LC010A-E/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, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC010A-E/ST belongs to Microchip's serial EEPROM product line, engineered specifically for automotive and industrial applications demanding high reliability, extended temperature operation, and SPI bus compatibility with minimal external components.

FAQ

What is the maximum clock frequency supported by the 25LC010A-E/ST?

The 25LC010A-E/ST supports a maximum clock frequency of 10 MHz when VCC is between 4.5 V and 5.5 V. At lower supply voltages (2.5–4.5 V), the maximum clock frequency reduces to 5 MHz, and at 1.8–2.5 V (not applicable to 25LC010A-E/ST due to its 2.5 V minimum VCC), it would be 3 MHz. These limits ensure reliable setup/hold timing margins across automotive temperature ranges.

Does the 25LC010A-E/ST require external pull-up resistors on its SPI lines?

The 25LC010A-E/ST does not require external pull-up resistors on SI, SO, or SCK lines because all inputs have internal weak pull-downs and outputs are actively driven. However, CS and WP pins should be externally pulled high (typically via 10 kΩ) to ensure defined logic states during power-up and idle conditions - critical for preventing unintended writes or device selection.

How does the HOLD function operate during an active SPI transaction in the 25LC010A-E/ST?

In the 25LC010A-E/ST, asserting HOLD low while SCK is low pauses the SPI transaction without resetting internal state. SI, SCK, and SO enter high-impedance, and further input transitions are ignored except for CS. To resume, HOLD must be raised high while SCK remains low; then normal communication continues from the exact bit position where it was suspended - enabling deterministic interrupt handling in real-time automotive firmware.

What memory protection mechanisms are implemented in the 25LC010A-E/ST?

The 25LC010A-E/ST implements three layered protections: (1) hardware WP pin that disables all writes when low, (2) write-enable latch (WEL) set only via WREN instruction, and (3) nonvolatile BP0/BP1 bits controlling 0%/25%/50%/100% array block protection. All three operate simultaneously - e.g., WP low overrides WEL and BP settings, ensuring fail-safe write inhibition.

Is the 25LC010A-E/ST pin-compatible with the 25AA010A series?

The 25LC010A-E/ST shares identical pinout and electrical characteristics with the 25AA010A series in the same package (e.g., ST), but differs in VCC range (2.5–5.5 V vs. 1.8–5.5 V) and temperature grade (automotive E vs. industrial I). Therefore, it is functionally compatible in E-temp designs but not a drop-in replacement in 1.8 V systems or non-automotive applications requiring wider voltage tolerance.