About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)Memory25LC256T-E/ST
25LC256T-E/ST Image
25LC256T-E/ST Image - 1
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

25LC256T-E/ST - Microchip Technology

Manufacturer Part Number
25LC256T-E/ST
Manufacturer
Microchip Technology
Allelco Part Number
32D-25LC256T-E/ST
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
26,272 pcs available, New & Original
Parts Description
IC EEPROM 256KBIT SPI 8TSSOP
Package
8-TSSOP
Data sheet
25LC256T-E/ST.pdf

PCN Assembly/Origin

Bond Wire 28/Mar/2022.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 26272
  • Unit Price: $0.809
  • Subtotal: $0.00

Want a better price?
Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $0.809 $0.81
10+ $0.684 $6.84
30+ $0.616 $18.48
100+ $0.538 $53.80
500+ $0.503 $251.50
1000+ $0.488 $488.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

25LC256T-E/ST Tech Specifications
Microchip Technology - 25LC256T-E/ST technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - 25LC256T-E/ST

Product Attribute Attribute Value
Manufacturer Microchip Technology
Write Cycle Time - Word, Page 5ms
Voltage - Supply 2.5V ~ 5.5V
Technology EEPROM
Supplier Device Package 8-TSSOP
Series -
Package / Case 8-TSSOP (0.173", 4.40mm Width)
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 125°C (TA)
Product Attribute Attribute Value
Mounting Type Surface Mount
Memory Type Non-Volatile
Memory Size 256Kbit
Memory Organization 32K x 8
Memory Interface SPI
Memory Format EEPROM
Clock Frequency 10 MHz
Base Product Number 25LC256

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.32.0051

Parts Introduction

25LC256T-E/ST Image
25LC256T-E/ST (1)

Manufacturer Part Number

25LC256T-E/ST

Manufacturer

Microchip Technology

Introduction

The 25LC256T-E/ST is a 256Kbit serial EEPROM Memory chip from Microchip Technology.

Product Features and Performance

256Kbit memory size (32K x 8)

Serial Peripheral Interface (SPI)

Up to 10 MHz clock frequency

5 ms write cycle time for both word and page

EEPROM technology for non-volatile memory storage

Wide voltage supply range from 2.5V to 5.5V

Operating temperature range from -40°C to 125°C

Product Advantages

Robust temperature range suited for harsh environments

High-speed data transfer capabilities

Compatible with standard SPI interfaces

Ensures data retention and easy data manipulation

Key Technical Parameters

Memory Size: 256Kbit

Memory Organization: 32K x 8

Memory Interface: SPI

Clock Frequency: 10 MHz

Write Cycle Time: 5ms

Voltage Supply: 2.5V to 5.5V

Operating Temperature: -40°C to 125°C

Quality and Safety Features

High reliability with EEPROM technology

Extended operational temperature range for safety across various conditions

Compatibility

SPI compatible interface for easy integration with most microcontrollers

Surface Mount 8-TSSOP packaging for compatibility with standard PCB designs

Application Areas

Consumer electronics

Industrial control systems

Automotive electronics

Communication equipment

Data storage and logging devices

Product Lifecycle

Product Status: Active

Not nearing discontinuation

Replacement or upgrade options readily available with similar EEPROMs from Microchip

Several Key Reasons to Choose This Product

Extended operating temperature range ideal for industrial and automotive applications

Reliable non-volatile memory storage solution

High-speed performance up to 10 MHz

Broad compatibility with various microcontroller SPI interfaces

Supplied in tape and reel for automated assembly processes

Easy to use with SPI interface, allowing for simple design integration

Manufactured by a reputable company, Microchip Technology

Frequently Asked Questions(FAQ)

How does the 25LC256T-E/ST compare to other SPI-based EEPROMs in terms of data retention and write endurance under typical industrial operating conditions?
The 25LC256T-E/ST offers a data retention period exceeding 400 years at 85°C, which is consistent with standard EEPROM technology. Its write endurance is rated at 1 million cycles per memory location, aligning with typical non-volatile memory reliability benchmarks. When compared to similar SPI EEPROMs like the M95256-WDW6TP or CAT25256YI-GT3, these specifications are generally comparable, though some variants may support higher cycle counts under controlled laboratory conditions. However, real-world performance depends heavily on duty cycle and thermal stress during operation.
What are the key differences between the 25LC256T-E/ST and alternative part numbers such as the M95256-DFDW6TP when used in high-temperature automotive environments?
While both the 25LC256T-E/ST and M95256-DFDW6TP operate over -40°C to +125°C and share a similar memory organization (32K x 8), the M95256-DFDW6TP is packaged in an SOIC-8, whereas the 25LC256T-E/ST uses an 8-TSSOP. This affects PCB layout density and thermal dissipation characteristics. Additionally, the 25LC256T-E/ST has a fixed 5ms page write time, while some M95 variants may offer slightly faster write cycles due to internal architecture optimizations, though this can vary by batch and temperature.
Can the 25LC256T-E/ST safely interface with 3.3V microcontrollers when powered from a 5V system without level-shifting circuitry?
Yes, the 25LC256T-E/ST supports a supply voltage range of 2.5V to 5.5V, allowing it to operate directly with 3.3V logic levels even when powered from a 5V source. Its input thresholds are compatible with standard 3.3V CMOS levels, reducing the need for external level translators in mixed-voltage systems. However, care must be taken during power-up sequencing to avoid undefined states, and pull-up resistors on the SPI lines may still be required depending on bus capacitance.
What is the maximum sustained data transfer rate achievable with the 25LC256T-E/ST using its SPI interface in a typical microcontroller-driven application?
At full clock frequency, the 25LC256T-E/ST supports up to 10 MHz SPI communication. In practical applications, this translates to approximately 1.25 MB/s of raw serial data throughput. However, effective bandwidth is limited by protocol overhead—read and write operations require command bytes and address fields, which reduce usable data rates. For sequential reads across multiple pages, actual throughput typically reaches 70–80% of the theoretical maximum under optimized code.
Is the 25LC256T-E/ST suitable for continuous logging applications where frequent writes occur over long durations?
Given its 1 million write endurance rating, the 25LC256T-E/ST can support moderate logging workloads, but continuous high-frequency writes will significantly reduce operational lifespan. For example, writing one byte every second results in roughly 11 days of operation before reaching the endurance limit. Implementing wear-leveling algorithms or buffering data in RAM before bulk writes can extend longevity. Alternatives with higher endurance or NOR flash may be more appropriate for intensive logging scenarios.
How does the page write feature of the 25LC256T-E/ST affect write efficiency compared to byte-by-byte programming in embedded firmware?
The 25LC256T-E/ST supports page writes up to 32 bytes per transaction, with a fixed 5ms write time regardless of page size. Writing a full 32-byte page takes 5ms, while smaller writes still consume the same duration, making page writes far more efficient than individual byte programming. For instance, writing 32 bytes once is 32 times faster than writing each byte separately. This makes page writes ideal for configuration data or structured records.
What precautions should be taken when integrating the 25LC256T-E/ST into a design using an STM32 or similar ARM Cortex-M microcontroller?
Ensure proper SPI mode configuration (Mode 0 is typical) and verify that chip select (CS) line timing meets setup and hold requirements relative to the 10 MHz clock. Due to the wide operating voltage range (2.5V–5.5V), check compatibility between the microcontroller’s I/O voltage and the EEPROM’s supply. Also, consider adding decoupling capacitors near the VCC pin and isolate the CS signal from noise sources to prevent spurious commands.
How does the Moisture Sensitivity Level (MSL) of 1 for the 25LC256T-E/ST impact storage and handling during PCB assembly?
With an MSL rating of 1, the 25LC256T-E/ST is considered moisture-insensitive and can be stored indefinitely at room temperature without baking prior to reflow soldering. This simplifies inventory management and reduces processing steps in manufacturing, unlike components with higher MSL ratings that require dry packaging and controlled storage conditions.
Can the 25LC256T-E/ST coexist on the same SPI bus as other SPI devices like sensors or ADCs without contention issues?
Yes, multiple SPI devices including the 25LC256T-E/ST can share a single SPI bus if each has a unique chip select (CS) line. Care must be taken to ensure no two devices drive the bus simultaneously. Proper CS gating and avoiding shared CS signals are essential. Additionally, ensure total bus capacitance remains within limits to maintain signal integrity at 10 MHz, especially if long traces or multiple packages are involved.
What are the implications of the 25LC256T-E/ST’s 32K x 8 memory organization for firmware design and data structuring?
The 32K x 8 organization means the device contains 32,768 bytes of user-accessible memory, addressable in 8-bit increments. Firmware must manage addressing beyond 256-byte boundaries using 16-bit addresses, and care must be taken to align data structures with page boundaries (typically 32 bytes) to leverage efficient page writes. This structure is well-suited for storing calibration tables, device settings, or small lookup tables but not large binary images.
Does the 25LC256T-E/ST support hardware write protection features that prevent accidental data modification?
Yes, the device includes a hardware write-protect pin (WP) that, when tied to ground, disables all write operations including status register modifications. This provides physical protection against unintended writes during system operation or maintenance. However, it does not protect against software-initiated writes when WP is active low, so additional software safeguards are recommended for critical data.
How reliable is the 25LC256T-E/ST in harsh environments where vibration and thermal cycling are present?
As a surface-mount IC with a robust package (8-TSSOP), the 25LC256T-E/ST exhibits good mechanical resilience under normal conditions. Its solder joints and internal bond wires are designed to withstand typical industrial-grade thermal cycling (-40°C to +125°C). However, extreme mechanical shock or prolonged exposure to corrosive atmospheres may affect long-term reliability, particularly if conformal coating is not applied or if PCB strain exceeds package limits.
What alternatives to the 25LC256T-E/ST should be considered if faster write speeds are required without changing the SPI interface?
If sub-5ms write times are needed, alternatives like the M95256-WMN6TP or certain Micron Serial Flash parts may offer improved write performance due to different internal architectures. However, most EEPROMs inherently have slower write speeds than NOR flash. For true speed improvements, transitioning to parallel NOR or NAND flash may be necessary, though this increases pin count and complexity.
How does the supply voltage droop during a page write operation affect the 25LC256T-E/ST in battery-powered applications?
During a 5ms page write, the internal charge pump activates to sustain programming voltages, drawing peak current up to 1.5 mA. Sudden supply droop below 2.5V during this window can cause incomplete writes or corruption. Designers should ensure adequate decoupling capacitance and stable power delivery, especially in low-voltage systems where headroom is minimal.
Can the 25LC256T-E/ST be used as a bootloader storage device in embedded systems requiring firmware updates?
While technically possible, the 25LC256T-E/ST is not ideal for storing bootloaders due to its relatively slow write speed and limited endurance. Bootloaders often require multiple write cycles during field updates, which could degrade the EEPROM prematurely. Instead, it is better suited for storing metadata, configuration parameters, or small diagnostic logs rather than executable code.
What role does the base product number 25LC256 play in selecting substitutes or evaluating lifecycle status for the 25LC256T-E/ST?
The base product number 25LC256 identifies a family of compatible EEPROMs across various packaging and temperature grades. Substitutes like the 25LC256-E/ST or M95256-DRDW3TP/K maintain electrical compatibility but may differ in pinout or packaging. Using the base number helps assess availability, obsolescence risk, and interchangeability during design reviews, ensuring continuity in production.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology 25LC256T-E/ST

Product Attribute 25LC256T-I/ST 25LC256T-E/SM 25LC256T-E/SM16KVAO 25LC256T-E/SN
Part Number 25LC256T-I/ST 25LC256T-E/SM 25LC256T-E/SM16KVAO 25LC256T-E/SN
Manufacturer Microchip Technology Microchip Technology Microchip Technology Microchip Technology
Write Cycle Time - Word, Page - - - -
Technology - - - -
Memory Format - - - -
Series - - - -
Voltage - Supply - - - -
Memory Type - - - -
Memory Size - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Clock Frequency - - - -
Memory Organization - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Memory Interface - - - -

25LC256T-E/ST Datasheet PDF

Download 25LC256T-E/ST pdf datasheets and Microchip Technology documentation for 25LC256T-E/ST - Microchip Technology.

Datasheets
25AA256, 25LC256.pdf
PCN Design/Specification
25AA256/25LC256 23/Jul/2021.pdf 25AA256/25LC256 28/Aug/2019.pdf
PCN Assembly/Origin
Bond Wire 28/Mar/2022.pdf
PCN Packaging
Label and Packing Changes 23/Sep/2015.pdf Reel Design Update 07/May/2015.pdf

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

Write a Review

Your Email address will not be published.

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
25LC256T-E/ST Image

25LC256T-E/ST

Microchip Technology
32D-25LC256T-E/ST

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB