Nanya Technology DDR4 High-Speed SDRAM Memory IC NT5AD256M16D4-HR

NT5AD256M16D4-HR Product Overview

The NT5AD256M16D4-HR is a high-performance 4Gb DDR4 SDRAM from Nanya Technology, manufactured on advanced low-power process technology. This device features a 256Mx16 organization with 4Gbit total density, 8 internal banks, 16-bit data bus width, operating at up to 1333MHz clock frequency (2666Mbps data transfer rate)-1-4.

The NT5AD256M16D4-HR delivers high-speed data transfer capabilities with low power consumption. The device supports Write Leveling, CRC error checking, internal temperature sensor, dynamic ODT, ZQ calibration, asynchronous reset, and other DDR4 standard features ensuring data integrity and system stability-2. This commercial-grade device supports 0°C to 95°C operating temperature and comes in a compact 7.5x13mm 96-ball TFBGA package-4-5.

The NT5AD256M16D4-HR is widely used in servers, industrial control, networking, video processing, FPGA companion memory, and embedded systems requiring high-bandwidth memory.

NT5AD256M16D4-HR Core Features

4Gbit High Density：4Gbit density with 256Mx16 organization for ample program and data storage

• High-Speed Data Transfer：1333MHz max clock frequency, 2666Mbps data rate (DDR4-2666) with CL19 timing-1-4

• Low Power Design：1.2V VDD/VDDQ core voltage, with 2.5V VPP for internal word line boost

• Advanced DDR4 Features：Write Leveling, CRC error checking, Internal Temperature Sensor, Dynamic ODT, ZQ calibration, Data Mask, Auto Precharge, Auto Self-Refresh-2

• 8-Bank Architecture：8 internal banks with 32M words per bank supporting interleaved access for improved throughput

• Commercial Temperature Grade：0°C to 95°C ambient operating temperature range-4-5

• Package：96-ball TFBGA, 13mm × 7.5mm with 0.8mm ball pitch, 1.0mm height-4-5

• Environmental Compliance：RoHS compliant, Lead-Free & Halogen-Free-1-4

  
  

NT5AD256M16D4-HR Applications

• FPGA/SoC Companion Memory：External DDR4 buffer for Xilinx, Intel (Altera) FPGAs for video frame buffering, data acquisition, embedded processor memory

• Industrial Control & Automation：Reliable memory for industrial PCs, PLC controllers, motion control cards

• Networking & Communications：Packet buffering and protocol processing in routers, switches, base stations

• Video & Image Processing：HD video frame buffering and temporary storage for multi-channel video codec systems

• Servers & Data Centers：Low-power servers, edge computing nodes, storage devices

• System-on-Module (SoM)：Memory solution for SoMs with processor or FPGA for embedded system development

  
  

NT5AD256M16D4-HR Key Advantages

• 4Gbit High Density：Sufficient memory capacity for most embedded systems, saving board space

• DDR4-2666 High Speed：2666Mbps providing up to 21.3GB/s bandwidth on 16-bit bus for high-throughput applications

• Low Power 1.2V Platform：~20% dynamic power reduction vs DDR3 (1.5V), ideal for battery-powered and power-sensitive embedded systems

• Comprehensive Features：Write Leveling, CRC, temperature sensor for enhanced reliability

• Mature & Reliable：Nanya Technology, a leading DRAM supplier, offers rigorously tested quality products

• Small Form Factor Package：7.5x13mm TFBGA for compact PCB designs

• Broad Compatibility：JEDEC DDR4 compliant, compatible with mainstream processors, FPGAs, SoC controllers

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FAQ:

1. What is the Nanya NT5AD256M16D4‑HR and what is it used for?
   It is a 4‑Gigabit (4 Gb) DDR4 SDRAM component organised as 256 Meg × 16 bits. It is designed for embedded systems that need high‑bandwidth memory with low power consumption, such as industrial controllers, networking equipment, set‑top boxes, and single‑board computers. The “HR” speed grade indicates a data rate of 2666 Mbps.

2. How does the NT5AD256M16D4‑HR differ from the 8 Gb NT5AD512M16C4‑HR? Which one should I choose?
   The primary difference is capacity. The NT5AD256M16D4‑HR is a 4 Gb (256M×16) device, while the NT5AD512M16C4‑HR is an 8 Gb (512M×16) device. The smaller capacity variant is often more cost‑effective for designs that do not need 1 GB of memory. The package, voltage, and speed are identical. Choose the 4 Gb part when your system memory requirements are modest and you want to optimise BOM cost.

3. What is the exact data rate and clock speed of the NT5AD256M16D4‑HR?
   The “HR” speed bin corresponds to DDR4‑2666. The memory cells operate at an internal clock of 166 MHz, delivering an effective data rate of 2666 Mbps per pin. The CAS latency for this speed grade is typically CL = 19 at the rated voltage and temperature.

4. What supply voltage does this DDR4 SDRAM require, and how does it compare to DDR3?
   It operates at a nominal VDD of 1.2 V, which is about 20% lower than the 1.5 V used by standard DDR3. This lower voltage significantly reduces power consumption and heat generation, making it particularly suitable for thermally constrained embedded designs. A separate VPP of 2.5 V is required for the internal word‑line boost.

5. What is the total capacity of this memory chip, and how is it organized?
   The total capacity is 4 Gb (512 MB). The organisation is 256M words × 16 bits, meaning each address accesses a 16‑bit word. This x16 width is often used in systems that need a wide memory bus without populating multiple x8 devices, making it a cost‑effective choice for many embedded processors.

6. What package does the NT5AD256M16D4‑HR use, and is it suitable for automated assembly?
   It is housed in a 96‑ball FBGA (Fine‑pitch Ball Grid Array) package, measuring 7.5 mm × 13 mm. The package is fully RoHS‑compliant and designed for standard surface‑mount reflow soldering processes. Its compact footprint saves board space, which is essential in dense embedded designs.

7. What are the main benefits of DDR4 over DDR3 for an embedded system?
   DDR4 offers higher data rates (up to 3200 Mbps vs. 2133 Mbps for DDR3), lower operating voltage (1.2 V vs. 1.5 V), and improved internal bank architecture. These gains translate into better throughput, longer battery life in portable devices, and reduced cooling requirements. The NT5AD256M16D4‑HR also supports advanced features like per‑bank refresh and fine‑granularity refresh, which improve system responsiveness.

8. What PCB design considerations are important when using this DDR4 SDRAM?
   The data lines (DQ, DQS) must be routed as length‑matched, controlled‑impedance traces with proper termination. VDD (1.2 V) and VPP (2.5 V) planes should be low‑impedance and well‑decoupled close to the device. Signal‑integrity simulations are recommended, especially for the address/command bus, because the 2666 Mbps data rate requires careful transmission‑line management.

9. Can this DDR4 memory be used as a drop‑in replacement for an older DDR3 chip?
   No. DDR4 and DDR3 have different pin counts, supply voltages, and signalling standards. A PCB designed for DDR3 cannot accept a DDR4 SDRAM without significant layout changes. When upgrading a design, you must also verify that the SoC or CPU memory controller supports DDR4.

10. What are the most typical embedded applications for this 4 Gb DDR4 memory component?
    It is used in single‑board computers (SBCs), networking switches and routers, IP cameras, set‑top boxes, industrial control modules, and FPGA‑based processing cards. Its combination of moderate capacity, high bandwidth, low voltage, and compact package makes it a popular choice for cost‑sensitive, space‑constrained designs that still demand reliable DDR4 performance.