Microchip Technology 25LC010AT-E/OT

Overview

25LC010AT-E/OT from Microchip Technology Inc. is a 1 Kbit (128 × 8) SPI Serial EEPROM with 16-byte page write capability, 10 MHz max clock frequency at 4.5–5.5 V, and industrial/automotive temperature support (−40°C to +125°C). It features hardware write protection (WP pin), HOLD functionality for interrupt-safe bus suspension, and block-level write protection (none/¼/½/all array). Used in microcontroller-based systems for configuration storage, calibration data retention, and firmware parameter backup.

For engineers reviewing the 25LC010AT-E/OT datasheet, 25LC010AT-E/OT pinout, 25LC010AT-E/OT application, or 25LC010AT-E/OT equivalent, key selection criteria include VCC range (2.5–5.5 V), automotive-grade operating temperature, SOT-23-6 package footprint, 16-byte page buffer constraint, and WP/HOLD pin behavior under interrupt conditions.

Technical Context

The 25LC010AT-E/OT 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 high-voltage generator for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal write cycle (≤5 ms); STATUS register (WIP/WEL/BP0/BP1 bits) enables real-time polling and nonvolatile protection configuration. Block protection is set via WRSR and persists across power cycles.

Key Specifications

Pinout & Package

25LC010AT-E/OT uses a 6-pin SOT-23 package (3.0 mm × 1.7 mm × 1.1 mm height), optimized for space-constrained automotive and portable electronics. Pin 1 is marked by laser dot; pin 1 location is bottom-left corner when viewed from top with marking side up and tab facing away.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC010AT-E/OT, the 25LC010A-I/OT sacrifices automotive qualification for lower cost, while AT25010B-SSHL-T omits HOLD and hardware WP-requiring firmware-level safeguards and limiting real-time interrupt handling capability.

Availability

25LC010AT-E/OT is available at Aetrix Electronics and suitable for automotive control units, industrial programmable logic controllers, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and AEC-Q100-aligned sourcing.

Supply support for 25LC010AT-E/OT 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 manufacturing and support infrastructure.

The 25LC010A family delivers cost-optimized, SPI-compatible EEPROMs targeting automotive, industrial, and consumer applications where reliability, small footprint, and hardware write protection are critical.

FAQ

What is the maximum clock frequency supported by the 25LC010AT-E/OT across its full voltage range?

The 25LC010AT-E/OT supports up to 10 MHz at VCC = 4.5–5.5 V, 5 MHz at 2.5–4.5 V, and 3 MHz at 1.8–2.5 V. However, since the 25LC010AT-E/OT is specified for 2.5–5.5 V operation (not 1.8 V), its usable maximum is 10 MHz at 4.5–5.5 V and 5 MHz at 2.5–4.5 V. This ensures timing compliance in both 3.3 V and 5 V MCU systems without derating.

Does the 25LC010AT-E/OT support page write operations, and what is the page size?

Yes, the 25LC010AT-E/OT supports page write mode with a fixed 16-byte page size. All bytes written in a single WRITE instruction must reside within the same physical page (addresses ending in 0000–1111 binary). Crossing a page boundary causes wraparound to the start of the current page-not the next-so firmware must validate address alignment before initiating multi-byte writes.

How does the WP pin interact with the write enable latch (WEL) in the 25LC010AT-E/OT?

In the 25LC010AT-E/OT, pulling WP low forces all write operations (array and STATUS register) to be inhibited regardless of WEL state, and resets the WEL. When WP is high, WEL controls write permission: WEL = 1 enables writes; WEL = 0 disables them. This dual-layer protection ensures hardware-level lockout even if firmware erroneously sets WEL.

What is the purpose of the HOLD pin in the 25LC010AT-E/OT, and how must it be used correctly?

The HOLD pin in the 25LC010AT-E/OT suspends ongoing SPI communication without resetting the internal state, enabling the host MCU to service higher-priority interrupts. To activate HOLD, it must be driven low while SCK is low; to resume, it must be raised high while SCK remains low. Violating this timing causes undefined behavior or bus lockup.

Is the 25LC010AT-E/OT RoHS compliant and lead-free?

Yes, the 25LC010AT-E/OT is Pb-free and RoHS compliant per Microchip's DS21832H documentation. The "T" suffix denotes tape-and-reel packaging, and "E" indicates automotive temperature grade (−40°C to +125°C), both consistent with J-STD-020 and AEC-Q100 requirements for lead-free assembly processes.