Winbond Electronics Corporation W972GG6JB25I

Overview

W972GG6JB25I from Winbond Electronics is a 2Gb (128M × 16) DDR2 SDRAM organized as 16M words × 8 banks × 16 bits, supporting DDR2-800 (5-5-5 or 6-6-6) operation at up to 400 MHz clock frequency with CL=5/6, tRCD/tRP=12.5 ns, and industrial temperature range of −40°C to +95°C. It features on-die termination (ODT), off-chip driver (OCD) impedance adjustment, posted CAS latency, and auto-precharge for embedded networking, industrial HMIs, and legacy controller-based systems.

For engineers reviewing the W972GG6JB25I datasheet, W972GG6JB25I pinout, W972GG6JB25I application, or W972GG6JB25I equivalent, key selection criteria include industrial-grade thermal reliability, SSTL_18 interface compliance, 84-ball WBGA package compatibility, and JEDEC DDR2-800 timing validation across full temperature range.

Technical Context

This DDR2 SDRAM implements a double-data-rate architecture synchronized to differential CLK/CLK inputs, with bi-directional DQ lines referenced to edge-aligned LDQS/UDQS (or single-ended DQS when configured) and DLL-aligned timing. It supports programmable additive latency (AL=0–2), burst lengths of 4 or 8, and write latency WL = RL − 1.

Functional control is managed via mode registers (MR) and extended mode registers (EMR1–EMR3), enabling dynamic configuration of ODT states, OCD calibration, DLL enable/disable, and drive strength. Power management includes precharged and active power-down modes, self-refresh with tREFI = 3.9 µS at 85–95°C, and burst refresh capability.

Key Specifications

Pinout & Package

W972GG6JB25I uses an 84-ball fine-pitch WBGA package (11 mm × 13 mm, 0.8 mm ball pitch) with RoHS-compliant lead-free finish and separate VDDQ/VSSQ planes for I/O noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT47H128M16HR-25E and IS42S16160F-3BL, W972GG6JB25I uniquely delivers DDR2-800 performance with validated −40°C to +95°C operation and integrated ODT/OCD - eliminating external termination components while maintaining JEDEC compliance across the full industrial envelope.

Availability

W972GG6JB25I is available at Aetrix Electronics and suitable for industrial HMIs, legacy controller upgrades, and network edge buffering requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for W972GG6JB25I 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 solutions including NOR/NAND Flash, SRAM, and DDR SDRAM for industrial, automotive, and communications markets.

The W972GG6JB series targets cost-sensitive, thermally demanding applications where DDR2 remains the optimal balance of bandwidth, power, and controller maturity - particularly in brownfield industrial upgrades and long-lifecycle infrastructure equipment.

FAQ

What is the maximum clock frequency supported by W972GG6JB25I?

W972GG6JB25I supports a maximum clock frequency of 400 MHz, enabling DDR2-800 data rates (800 MT/s). This is validated for both 5-5-5 and 6-6-6 timing configurations across its full industrial temperature range of −40°C to +95°C, with tCK(min) = 2.5 ns at CL=5/6. The device does not support DDR2-1066 operation.

Does W972GG6JB25I require external termination resistors?

No, W972GG6JB25I integrates on-die termination (ODT) controlled via the ODT pin and extended mode registers. When enabled, it provides programmable termination on DQ and DQS lines, eliminating the need for external 50 Ω parallel resistors and simplifying PCB layout. External termination is optional only if ODT is disabled in system configuration.

How is the industrial temperature rating of W972GG6JB25I validated?

W972GG6JB25I is fully characterized and guaranteed to meet all JEDEC DDR2 AC/DC specifications - including tRCD, tRP, tRC, and IDD parameters - across −40°C ≤ TCASE ≤ 95°C. At 85–95°C, it requires doubled refresh rate (tREFI = 3.9 µS) enabled via EMR(2) bit A7, and self-refresh current remains ≤12 mA per JEDEC spec.

Can W972GG6JB25I be used as a drop-in replacement for DDR2-667 memory modules?

W972GG6JB25I is pin-compatible and electrically compatible with DDR2-667 modules using the same 84-ball WBGA package and SSTL_18 interface, but operates at higher speed (DDR2-800). As a drop-in replacement, it requires controller firmware support for DDR2-800 timing parameters (e.g., tRCD = 12.5 ns vs. 15 ns) and may deliver improved bandwidth without hardware changes.

What is the purpose of the VDDL and VSSDL pins on W972GG6JB25I?

VDDL (J1) and VSSDL (J7) are dedicated power and ground supplies for the internal delay-locked loop (DLL) circuitry. Isolating DLL biasing from main VDD/VSS prevents switching noise from degrading DLL stability and clock-to-data alignment accuracy - critical for maintaining tAC and tDQSS margins at 400 MHz operation. W972GG6JB25I requires clean, low-noise 1.8 V on VDDL.