Winbond Electronics Corporation W9425G6JB-5I TR

Overview

W9425G6JB-5I TR from Winbond is a 64 Mbit (4 M × 4 banks × 16 bits) DDR SDRAM operating at 200 MHz clock frequency with 2.5 V ±0.2 V supply, CAS latency options of 2/2.5/3, and SSTL_2 interface - designed for main memory in industrial embedded systems requiring extended temperature operation (-40°C to +85°C).

For engineers reviewing the W9425G6JB-5I TR datasheet, W9425G6JB-5I TR pinout, W9425G6JB-5I TR application, or W9425G6JB-5I TR equivalent, this page delivers verified DDR timing parameters, ball-level I/O mapping, power-down modes, refresh behavior, and drop-in alternatives for legacy DDR400/CL3 designs.

Technical Context

The W9425G6JB-5I TR implements double-data-rate architecture synchronized to both edges of DQS, with differential CLK/CLK inputs and edge-aligned read data / center-aligned write data. It supports programmable burst lengths (2/4/8), interleave/sequential addressing, and DLL-enabled timing control via EMRS/MRS registers.

Its command set includes Bank Activate, Precharge All, Read/Write with Auto-precharge, Self Refresh Entry/Exit, and Burst Stop - all governed by tRAS ≥40 ns, tRC ≥55 ns, and 7.8 µs refresh interval (8K rows/64 ms). Power management includes Active and Precharged Power Down modes, with IDD6 ≤2 mA in Self Refresh.

Key Specifications

Pinout & Package

W9425G6JB-5I TR uses a 60-ball TFBGA package (8 mm × 13 mm, 0.8 mm pitch) with lead-free, RoHS-compliant construction. Ball assignments follow JEDEC-standard DDR SDRAM layout with dedicated VDDQ/VSSQ planes and differential clock inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V32M16P-5B:J and IS42S16320F-5BLI, W9425G6JB-5I TR uniquely combines industrial temperature range, CL=2 support, and 40 ns tRAS - making it optimal for latency-constrained embedded systems where thermal margin and timing headroom are non-negotiable.

Availability

W9425G6JB-5I TR is available at Aetrix Electronics and suitable for industrial HMI panels, medical imaging controllers, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W9425G6JB-5I TR 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 DRAM products for industrial, automotive, and computing markets.

W9425G6JB-5I TR belongs to Winbond's legacy DDR SDRAM product line, engineered specifically for cost-sensitive, thermally demanding embedded applications where DDR400 performance and industrial qualification are required without migrating to DDR2 or DDR3.

FAQ

What is the maximum clock frequency supported by W9425G6JB-5I TR?

W9425G6JB-5I TR supports a maximum clock frequency of 200 MHz, corresponding to DDR400 data rates (400 MT/s). This is validated under industrial temperature conditions (-40°C to +85°C) with CL=2.5 and CL=3; CL=2 operation is guaranteed down to 7.5 ns tCK (133 MHz equivalent base clock).

Does W9425G6JB-5I TR require external termination resistors for SSTL_2 signaling?

No, W9425G6JB-5I TR integrates on-die termination (ODT) for DQ/DQS lines, eliminating need for external 25 Ω or 50 Ω resistors. VREF must be supplied at 1.25 V ±1% to enable proper SSTL_2 input threshold referencing - critical for signal integrity at 200 MHz.

How many auto-refresh commands must be issued per 64 ms for W9425G6JB-5I TR?

W9425G6JB-5I TR requires 8,192 auto-refresh cycles every 64 ms, resulting in one command every 7.8 µs. The device allows up to eight pending auto-refresh commands; exceeding this queue depth risks data retention failure. The internal refresh counter handles address generation - no external address control needed.

Can W9425G6JB-5I TR operate in Self Refresh mode without an external clock?

Yes, W9425G6JB-5I TR enters Self Refresh mode when CKE is driven low while all banks are idle. In this state, the DLL disables automatically, and the internal oscillator sustains refresh - allowing full system clock shutdown. VREF must remain stable at 1.25 V, and exit requires 200 NOP cycles before issuing further commands.

What is the function of A10 during Bank Precharge versus Precharge All commands on W9425G6JB-5I TR?

On W9425G6JB-5I TR, A10 determines scope: when A10 = Low during Bank Precharge, only the bank selected by BA0/BA1 is precharged; when A10 = High during Precharge All, all four banks transition to idle simultaneously - regardless of BA0/BA1 state. This dual-role design simplifies command encoding while maintaining bank-level control granularity.