Winbond Electronics Corporation W9425G6JB-5 TR

Overview

W9425G6JB-5 TR from Winbond is a 64 Mbit (4 M × 4 banks × 16 bits) DDR SDRAM operating at 200 MHz with 2.5 V ±0.2 V supply, CAS latency options of 2/2.5/3, and SSTL_2 interface compliance. It delivers up to 400 M words/s bandwidth and supports auto-refresh (7.8 µs interval), self-refresh (2 mA max), and power-down modes for embedded memory subsystems in industrial controllers and legacy PC platforms.

For engineers reviewing the W9425G6JB-5 TR datasheet, W9425G6JB-5 TR pinout, W9425G6JB-5 TR application, or W9425G6JB-5 TR equivalent, this page provides verified DDR400/CL3 timing parameters, 60-ball TFBGA package mapping, bank-activate/read/write command behavior, burst-length programmability (2/4/8), and differential clock (CLK/CLK̄) synchronization requirements critical for memory controller interface design and signal integrity validation.

Technical Context

This DDR SDRAM implements double-data-rate architecture with edge-aligned DQS on read and center-aligned DQS on write, supporting interleaved 2-bank and 4-bank read operations. Its mode register controls burst length, addressing mode (sequential/interleave), and DLL reset, while extended mode register enables DLL activation and output driver strength selection.

It requires strict power-up initialization: stable 200 µs delay post-power, 200+ clock cycles for DLL lock after EMRS, precharge-all before MRS, and two auto-refresh commands before operational use. Command decoding depends on CS, RAS̄, CAS̄, and WĒ levels, with A10 determining single-bank vs. all-bank precharge and BA0/BA1 selecting active bank.

Key Specifications

Pinout & Package

W9425G6JB-5 TR uses a 60-ball thin fine-pitch BGA (TFBGA) package with 0.8 mm ball pitch, 8 mm × 13 mm footprint, and RoHS-compliant lead-free construction. Power and ground are segregated: VDD/VSS for core logic, VDDQ/VSSQ for I/O buffers, and VREF for input threshold reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V32M16-5B:J and IS42S16400F-5BL, W9425G6JB-5 TR offers the lowest self-refresh current (2 mA) and CL2 support in its commercial temperature grade, making it optimal for thermally constrained, latency-sensitive designs where full industrial temp range is unnecessary.

Availability

W9425G6JB-5 TR is available at Aetrix Electronics and suitable for industrial HMI panels, legacy PC memory modules, network edge routers, and medical diagnostic terminals requiring stable component supply, long-lifecycle support, and guaranteed DDR400/CL3 timing compliance.

Supply support for W9425G6JB-5 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-5 TR belongs to Winbond's DDR SDRAM product line designed for cost-effective, high-reliability main memory in legacy and embedded systems requiring JEDEC-compliant DDR400 operation with minimal power overhead.

FAQ

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

W9425G6JB-5 TR supports a maximum clock frequency of 200 MHz, corresponding to DDR400 data rate (400 MT/s). This is confirmed by its -5 speed grade designation and tCK minimum of 5 ns at CL=3. The device meets JEDEC DDR400/CL3 specifications and requires stable differential clock inputs (CLK/CLK̄) referenced to their crossing point.

Does W9425G6JB-5 TR support CAS latency of 2?

Yes, W9425G6JB-5 TR supports programmable CAS latency of 2, 2.5, and 3 via its mode register. CL2 operation is explicitly listed in the features section and validated in timing tables (e.g., tCK min = 7.5 ns at CL=2). This enables lower read access latency in systems where controller timing margins allow.

What package type and dimensions does W9425G6JB-5 TR use?

W9425G6JB-5 TR uses a 60-ball thin fine-pitch BGA (TFBGA) package measuring 8 mm × 13 mm with 0.8 mm ball pitch. It is lead-free and RoHS compliant. Ball configuration and pin functions are fully documented in sections 5 and 6 of the datasheet, including dedicated VDDQ/VSSQ planes for I/O noise isolation.

How does W9425G6JB-5 TR handle refresh operations?

W9425G6JB-5 TR supports both auto-refresh and self-refresh. Auto-refresh requires periodic commands every 7.8 µs average interval (8K rows / 64 ms), with up to eight pending commands allowed. Self-refresh enters upon CKE low and maintains data with only 2 mA typical current, requiring VREF stability but no external clock.

Is W9425G6JB-5 TR pin-compatible with other 60-ball DDR SDRAMs?

W9425G6JB-5 TR follows standard DDR SDRAM ballout conventions (e.g., A0–A12, BA0/BA1, DQ0–DQ15, LDQS/UDQS, CLK/CLK̄), but pin compatibility must be verified per manufacturer. IS42S16400F-5BL shares identical 60-ball TFBGA mapping and function assignment, enabling direct PCB reuse; MT46V32M16-5B:J uses a different 66-ball TSOP-II package and is not pin-compatible.