Winbond Electronics Corporation W972GG8JB-25

Overview

W972GG8JB-25 from Winbond is a 2G-bit DDR2 SDRAM organized as 32M × 8 banks × 8 bits, operating at DDR2-800 speed (5-5-5 or 6-6-6 timing), with 1.8 V ±0.1 V supply, SSTL_18 interface, and support for CAS latencies 3–7. It serves as main memory in embedded computing, industrial controllers, and legacy networking equipment requiring reliable synchronous DRAM with on-die termination and OCD calibration.

For engineers reviewing the W972GG8JB-25 datasheet, W972GG8JB-25 pinout, W972GG8JB-25 application, or W972GG8JB-25 equivalent, key selection considerations include its -25 speed grade timing compliance, WBGA-60 package footprint, ODT and OCD programmability, burst length flexibility (4/8), and industrial-grade thermal compatibility up to 85°C case temperature.

Technical Context

This DDR2 SDRAM implements a double-data-rate architecture synchronized to differential CLK/CLK inputs, with bi-directional DQS/DQS strobes edge-aligned to read data and center-aligned to write data. Its DLL aligns DQ and DQS transitions to clock edges, enabling stable 400 MHz (200 MHz clock) operation under DDR2-800 timing.

It supports programmable additive latency (AL = 0–2), auto-precharge, self-refresh, and power-down modes (active and precharged). Command decoding uses CS, RAS, CAS, WE, and BA0–BA2, with address A0–A14 selecting rows/columns and A10 controlling auto-precharge - all latched on differential clock crossings.

Key Specifications

Pinout & Package

W972GG8JB-25 is packaged in a 60-ball WBGA (11 mm × 11.5 mm, 0.8 mm pitch), lead-free and RoHS-compliant. Ball layout follows JEDEC-standard DDR2 SDRAM pinout with dedicated VDDQ/VSSQ domains and isolated DLL power (VDDL/VSSDL).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR2 SDRAM applications.

Compared with W972GG8JB-25, MT47H64M8CB-25E:H offers identical timing but no OCD tuning, while IS42S32800J-25BLI trades pin compatibility for wider bus width - making W972GG8JB-25 optimal for cost-sensitive, space-constrained x8 DDR2 upgrades where signal integrity tuning is essential.

Availability

W972GG8JB-25 is available at Aetrix Electronics and suitable for industrial automation, legacy networking infrastructure, and medical display systems requiring stable component supply, long-lifecycle support, and verified DDR2-800 interoperability.

Supply support for W972GG8JB-25 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

Winbond Electronics is a Taiwan-based semiconductor company specializing in specialty memory, flash, and trusted computing solutions, with over 30 years of DRAM design heritage.

The W972GG8JB series belongs to Winbond's industrial-grade DDR2 SDRAM product line, engineered for extended temperature operation, signal integrity robustness, and long-term availability in embedded systems where DDR3/DDR4 migration is impractical.

FAQ

What DDR2 speed grade does W972GG8JB-25 support?

W972GG8JB-25 supports DDR2-800 operation with two timing bin options: 5-5-5 (tRCD/tRP = 12.5 ns) or 6-6-6 (same parameters at relaxed timing). It achieves 400 MHz clock frequency with 800 MT/s data rate, validated across 0°C to 85°C case temperature range. The -25 suffix explicitly denotes this speed grade per Winbond's ordering nomenclature.

Does W972GG8JB-25 support on-die termination (ODT)?

Yes, W972GG8JB-25 supports ODT via the dedicated ODT pin, enabling programmable termination resistance (75 Ω or 150 Ω) on DQ and DQS lines during read/write operations. This feature eliminates need for external termination resistors and improves signal integrity on high-speed DDR2 buses - confirmed in Section 2 (Features) and Section 6 (Ball Description) of the datasheet.

What package type and footprint does W972GG8JB-25 use?

W972GG8JB-25 uses a 60-ball WBGA package measuring 11 mm × 11.5 mm with 0.8 mm pitch, lead-free and RoHS-compliant. Its ball map follows JEDEC-standard DDR2 SDRAM layout, including segregated VDDQ/VSSQ and VDDL/VSSDL domains - detailed in Sections 5 and 12 of the datasheet and verified on Winbond's official product page.

Can W972GG8JB-25 operate with CAS Latency 3?

Yes, W972GG8JB-25 supports CAS Latency 3 at DDR2-800 speed, with minimum tCK = 5 ns (200 MHz clock). This is explicitly listed in Table 4 (KEY PARAMETERS) under "@CL = 3" row, and confirmed in Section 2 (FEATURES) as "CAS Latency: 3, 4, 5, 6 and 7". CL=3 enables lowest read latency for real-time control applications.

Is OCD calibration supported on W972GG8JB-25?

Yes, W972GG8JB-25 supports Off-Chip Driver (OCD) impedance calibration via Extended Mode Register EMR(1), allowing fine-tuning of DQ output driver strength to match PCB trace impedance. This capability is documented in Section 2 (FEATURES), Section 8.2.3, and Figure 1 initialization flow - critical for achieving robust write timing margins in high-density layouts.