Microchip Technology 25LC256T-E/SN16KVAO

Overview

25LC256T-E/SN16KVAO from Microchip Technology Inc. is a 256 Kbit SPI Serial EEPROM with 32,768 × 8-bit organization, 64-byte page size, and 10 MHz max clock frequency. It operates across 2.5–5.5V supply and -40°C to +125°C (Extended temperature grade), featuring hardware write protection via WP pin and STATUS register, self-timed 5 ms write cycles, and 1 million endurance cycles - deployed in automotive infotainment boot memory and industrial sensor calibration storage.

For engineers reviewing the 25LC256T-E/SN16KVAO datasheet, 25LC256T-E/SN16KVAO pinout, 25LC256T-E/SN16KVAO application, or 25LC256T-E/SN16KVAO equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), TSSOP-8 package footprint, HOLD/CS timing margins per AC Table 1-2, and block protection configuration (BP0/BP1) for firmware update safety.

Technical Context

The 25LC256T-E/SN16KVAO implements a standard SPI Mode 0,0 interface with separate SI/SO lines and active-low CS, supporting byte and page writes within 64-byte aligned boundaries. Its internal architecture includes an 8-bit instruction register, status register with WIP/WEL/BP bits, and high-voltage generator for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate internal 5 ms erase/write cycle; read operations support continuous sequential addressing with automatic address rollover at 0x7FFF. HOLD pin suspends ongoing transfers without resetting state, enabling interrupt servicing on shared SPI buses.

Key Specifications

Pinout & Package

25LC256T-E/SN16KVAO is packaged in an 8-lead TSSOP (SN) with 0.65 mm pitch, 4.4 mm body width, and RoHS-compliant matte tin finish. Pin 1 is marked with a dot or beveled corner; orientation follows standard JEDEC TSSOP layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA256-I/SN, the 25LC256T-E/SN16KVAO offers extended temperature operation and automotive qualification but lacks 1.8V support; versus AT25SF256A-SSHD-B, it provides simpler SPI-0,0 compatibility and HOLD functionality at lower speed, avoiding firmware rewrite costs.

Availability

25LC256T-E/SN16KVAO is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25LC256T-E/SN16KVAO 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC256 belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications demanding AEC-Q100 compliance and long-term data integrity.

FAQ

What is the maximum clock frequency supported by the 25LC256T-E/SN16KVAO?

The 25LC256T-E/SN16KVAO supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5V, 5 MHz at 2.5–4.5V, and 3 MHz at 1.8–2.5V. These values are specified in Table 1-2 of DS20001822H and apply to both read and write operations. The 25LC256T-E/SN16KVAO must be operated within these limits to guarantee timing compliance and data integrity.

Does the 25LC256T-E/SN16KVAO support hardware write protection?

Yes, the 25LC256T-E/SN16KVAO supports hardware write protection via the WP pin in conjunction with the WPEN bit in its STATUS register. When WPEN = 1 and WP = low, writes to nonvolatile STATUS register bits are disabled. All other functions remain operational. This dual-layer protection is documented in Table 2-1 and Section 2.6 of DS20001822H.

What package type is used for the 25LC256T-E/SN16KVAO?

The 25LC256T-E/SN16KVAO uses an 8-lead TSSOP (Thin Shrink Small Outline Package) with 4.4 mm body width and 0.65 mm lead pitch, designated as 'SN' in Microchip's packaging nomenclature. This matches the drawing C04-057-SN Rev E and is confirmed in the Device Selection Table on page 1 of DS20001822H.

How many write/erase cycles does the 25LC256T-E/SN16KVAO guarantee?

The 25LC256T-E/SN16KVAO guarantees 1,000,000 write/erase cycles at 25°C and 5.5V, as specified in Table 1-3 (Param. No. 21) of DS20001822H. Endurance is characterized across temperature and voltage; actual field performance may vary based on operating conditions and usage patterns.

Is the 25LC256T-E/SN16KVAO AEC-Q100 qualified?

Yes, the 25LC256T-E/SN16KVAO is AEC-Q100 qualified for the Extended temperature grade (-40°C to +125°C), as explicitly stated in the Features section on page 1 of DS20001822H. This qualification covers stress testing including temperature cycling, HTOL, and ESD, making it suitable for automotive under-hood applications.