LT4W256K16-35

4Mbit Asynchronous SRAM, 256Kx16, 35ns, 3.3V, TSOP-II-44, Industrial Grade

3456

Effective Inventory
Go to Inquiry

Image for reference only

Manufacturer Part：

LT4W256K16-35

Package：

TSOP-II

Brand：
Product Categories：
Quality Commitment
Shipping & Payment
Service & Packaging
Product Manual
Other recommendations you may be interested in.

MSP430F5304IRGZR

MS9282-1

OP2177ARMZ

NJM2068M

NCF3320EHN

NC7SZ126M5X

MT8870DSR1

MCP6S26-I

Description

Product Overview

The LT4W256K16-35 is a 4Mbit asynchronous CMOS SRAM (Static Random Access Memory) organized as 256K x 16 bits. It features 35ns access time and operates from a 3.3V supply voltage. The device offers high-speed asynchronous operation with separate byte control (UB/LB) for upper and lower byte access. Available in standard packages such as TSOP-II, it is suitable for a wide range of embedded applications requiring fast volatile memory with low power consumption.

Key Specifications

r>

Memory Type SRAM – Asynchronous (Volatile)
Memory Size 4Mbit (256K x 16)
Interface Parallel
Access Time 35 ns
Voltage Supply 3.3V (typ)
Organization 262,144 words x 16 bits
Byte Control UB# and LB# (upper/lower byte select)
Operating Temperature -40°C ~ 85°C (industrial)
Package TSOP-II (44-pin)
Chip Enable Single CE# control

Features

  • 4Mbit density: 256K x 16 bit organization
  • Fast access time: 35ns
  • Single 3.3V power supply
  • Low power CMOS technology
  • Full static operation – no clock or refresh
  • Three-state outputs
  • Separate byte control: UB# and LB#
  • Single chip enable (CE#)
  • Output enable (OE#) for memory expansion
  • TTL compatible inputs and outputs
  • Data retention at low voltage
  • Industrial temperature range
  • JEDEC standard pinout
  • RoHS compliant

Applications

  • Cache memory systems
  • Industrial control and automation
  • Telecommunications equipment
  • Embedded systems data buffering
  • Networking and data communication
  • High-speed data acquisition
  • Medical equipment
  • Test and measurement instruments

The LT4W256K16-35 is a 4,194,304-bit high-speed CMOS static RAM organized as 262,144 words by 16 bits from Lyontek. It provides 35ns access time for high-performance memory applications requiring fast random access. The device operates from a single 3.3V power supply and features low power consumption using advanced CMOS technology. All inputs and outputs are TTL compatible, and the device features three-state outputs for easy bus interfacing. Byte control via UB# and LB# pins allows independent access to upper and lower bytes, providing flexibility for 8-bit or 16-bit system designs. The single chip enable (CE#) and output enable (OE#) simplify memory expansion in larger systems. The device supports data retention at lower voltages for battery backup applications. It is available in a 44-pin TSOP-II (Type II) package with standard pinout compatible with other 256Kx16 SRAM devices. With industrial temperature range operation, it is suitable for demanding applications including industrial control, telecommunications, networking, and test equipment.

The LT4W256K16 is an asynchronous static RAM that stores data in CMOS flip-flop memory cells, requiring no refresh cycles or clock signal. In a read operation, when chip enable (CE#) is low and write enable (WE#) is high, the address inputs select a memory cell and the data is output on the I/O pins after the access time delay. Output enable (OE#) controls the output buffers, allowing multiple devices to share a common data bus. Upper byte (UB#) and lower byte (LB#) controls determine which bytes are read or written. In a write operation, when CE# and WE# are low, data on the I/O pins is written into the addressed memory cell. Since it is fully static and asynchronous, there is no clock signal – all operations are controlled by the timing of CE#, OE#, WE#, UB#, and LB# signals. The CMOS design ensures low standby power consumption when CE# is high. Data retention capability allows the memory contents to be preserved at reduced supply voltage, making it suitable for battery backup applications where non-volatile read/write memory is needed.

Pin Number Pin Name Type Description
A0-A17 Address Inputs Input 18 address lines for 256K word addressing
I/O0-I/O15 Data I/O I/O 16 bidirectional data input/output lines
CE# Chip Enable Input Active low chip enable
OE# Output Enable Input Active low output enable for read mode
WE# Write Enable Input Active low write enable
LB# Lower Byte Enable Input Active low lower byte (I/O0-I/O7) select
UB# Upper Byte Enable Input Active low upper byte (I/O8-I/O15) select
VCC Power Supply Power 3.3V power supply
GND Ground Ground Device ground connection
NC No Connection – No internal connection
  • High-speed cache and buffer memory
  • Industrial PLC and control systems
  • Telecom switching and transmission equipment
  • Embedded system data buffering
  • Network router and switch buffers
  • High-speed data acquisition systems
  • Medical diagnostic equipment
  • Test and measurement instruments
Manufacturer Part Number Description
ISSI IS61WV25616BLL-35TLI 4Mbit SRAM, 256Kx16, 35ns, TSOP
Alliance AS7C256A-35TIN 4Mbit SRAM, 256Kx16, 35ns, TSOP
Cypress/Infineon CY62147EV30LL-35ZSXIT 4Mbit MoBL SRAM, 256Kx16, 35ns
Renesas R1RP0416DSB-3SI 4Mbit SRAM, 256Kx16, 35ns, TSOP
Recommend Parts

MSP430F5304IRGZR

16-bit ultra-low-power MCU, 25MHz, 8KB Flash, 6KB RAM, 10-bit ADC, VQFN-48

Brand:

Package:

VQFN-48 (7.0 x 7.0 x 0.95 mm, 0.5mm pitch, exposed pad)

In stock:

8900pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

MS9282-1

VGA/YPbPr to HDMI converter, 10-bit ADC, 165MSPS, 1080P@60Hz, I2S/SPDIF audio, LQFP-64

Brand:

Package:

LQFP-64 (10.0 x 10.0 x 1.4 mm, 0.5mm pitch)

In stock:

4200pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

OP2177ARMZ

Dual precision op-amp, 60µV offset, 0.7µV/°C drift, 1.3MHz GBW, 7.9nV/√Hz noise, MSOP-8

Brand:

Package:

MSOP-8 (3.0 x 3.0 x 0.95 mm, 0.65mm pitch)

In stock:

6500pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

NJM2068M

Dual JFET-input op-amp, low noise, 8MHz GBW, 5V/µs slew, ±4 to ±18V, SOP-8, audio

Brand:

Package:

DMP-8 / SOP-8 (4.9 x 3.9 x 1.6 mm, 1.27mm pitch)

In stock:

15000pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

NCF3320EHN

NFC Type 2 Tag IC, ISO 14443A, 1.5KB EEPROM, I2C+SPI host interface, energy harvesting, QFN-32

Brand:

Package:

HVQFN-32 (5.0 x 5.0 x 0.85 mm, 0.5mm pitch)

In stock:

4200pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

NC7SZ126M5X

Single 3-state buffer, non-inverting, 1.65-5.5V, 3ns delay, ±24mA drive, SOT-23-5

Brand:

Package:

SOT-23-5 / SC-74A (2.9 x 1.6 x 1.0 mm, 0.95mm pitch)

In stock:

25000pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry
Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

Online Inquiry Form

Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.

Company
insights
Industries
All Products
Integrated Circuits
C&I Devices
Discrete
Memory Chips
MPUs & MCUs