K4D551638H-LC40000 – GDDR SDRAM (DDR SGRAM) – Samsung

The Samsung K4D551638H-LC40000 is a 256Mbit GDDR SDRAM (graphics DDR / DDR SGRAM) organized as 16M x 16 (4M x 16 x 4 banks) in a 66-pin TSOP-II package. This obsolete graphics memory is available for RFQ at Pacific Component Xchange.

The Samsung K4D551638H-LC40000 is a 256-megabit GDDR SDRAM (graphics double data rate SDRAM, also referred to as DDR SGRAM) device fabricated on Samsung’s high-performance CMOS process. It contains 268,435,456 bits organized as 16M x 16 (4M words x 16 bits x 4 banks), and is housed in a 66-pin TSOP-II package. The “-LC40” designation identifies the graphics DDR speed grade (250 MHz) in this Samsung K4D55-series family.

Designed for high-bandwidth graphics subsystems, the K4D551638H delivers double-data-rate transfers on a 16-bit data bus, making it a common choice in legacy GPU frame buffers, graphics cards, and embedded display controllers of its generation. As a long-discontinued part, it is no longer available through authorized distribution and is sourced exclusively on the secondary/obsolete market.

Key Features

• Memory type: GDDR SDRAM (graphics DDR / DDR SGRAM)
• Density: 256 Mbit (268,435,456 bits)
• Organization: 16M x 16 (4M words x 16 bits x 4 banks)
• Package: 66-pin TSOP-II
• Interface: Double data rate, 16-bit I/O
• Speed grade: -LC40 grade (250 MHz)
• Manufacturer: Samsung Semiconductor
• Lifecycle: Obsolete / end-of-life

Applications

• Legacy GPU and graphics-card frame buffers
• Embedded graphics and display controllers
• Industrial imaging and video processing boards
• High-bandwidth buffering in legacy networking/telecom hardware
• Repair, refurbishment, and long-lifecycle system maintenance

Why Source K4D551638H-LC40000 from Pacific Component Xchange

The K4D551638H-LC40000 is an obsolete graphics memory device with little to no authorized-distributor availability. Pacific Component Xchange specializes in hard-to-find and end-of-life memory, helping engineers and procurement teams keep legacy designs and installed systems in production. We currently have inventory available for this part.

• Hard-to-find & obsolete sourcing: Access scarce, discontinued memory that mainline distributors no longer carry.
• Authenticity & quality: Rigorous inspection and counterfeit-avoidance processes to protect your build.
• Global shipping: Fast, reliable worldwide fulfillment for production and service needs.

Ready to buy? Quantity is limited and pricing is provided on request. Request a quote (RFQ) for the Samsung K4D551638H-LC40000 today and our team will respond promptly with availability and pricing.