Winbond Electronics Corporation W9425G6JB-5I

Overview

W9425G6JB-5I 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 from –40°C to +85°C.

For engineers reviewing the W9425G6JB-5I datasheet, W9425G6JB-5I pinout, W9425G6JB-5I application, or W9425G6JB-5I equivalent, this page delivers verified timing parameters, ball-level I/O mapping, DDR400/CL3 compliance, power-down modes, and validated drop-in alternatives for industrial-grade memory design.

Technical Context

This DDR SDRAM 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), bank-interleaved reads, and auto-precharge for efficient memory access scheduling.

Its internal architecture includes four independent banks, DLL-based clock alignment, mode register (MRS) and extended mode register (EMRS) for configuration, and dual power domains (VDD/VSS and VDDQ/VSSQ) to isolate core logic from I/O noise - enabling stable operation under thermal stress and signal integrity constraints.

Key Specifications

Pinout & Package

W9425G6JB-5I is housed in a 60-ball TFBGA package (8 mm × 13 mm, 0.8 mm pitch), RoHS-compliant and lead-free. Ball assignment follows JEDEC-standard DDR SDRAM layout with dedicated VDDQ/VSSQ planes for I/O noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V32M16-5B:J and IS42S16160F-6BLI, W9425G6JB-5I uniquely combines DDR400 speed, industrial temperature range, and Winbond's proven reliability in long-lifecycle embedded deployments - making it the optimal choice where both performance and environmental robustness are non-negotiable.

Availability

W9425G6JB-5I is available at Aetrix Electronics and suitable for industrial HMI controllers, medical imaging front-ends, automotive ADAS camera modules, ruggedized network appliances, and other applications requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for W9425G6JB-5I 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.

The W9425G6JB-5I belongs to Winbond's industrial-grade DDR SDRAM product line, engineered specifically for applications demanding guaranteed operation from –40°C to +85°C, low-power self-refresh, and JEDEC-compliant DDR400 timing - targeting embedded systems with long service life and zero tolerance for memory failure.

FAQ

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

W9425G6JB-5I supports a maximum clock frequency of 200 MHz, corresponding to DDR400 data rate (400 MT/s). This is confirmed by its tCK minimum of 5 ns at CAS Latency = 3, and the device is fully compliant with the DDR400/CL3 specification per its ordering information and AC timing table.

Does W9425G6JB-5I support both Auto Refresh and Self Refresh modes?

Yes, W9425G6JB-5I supports both Auto Refresh and Self Refresh. Auto Refresh requires periodic commands every 7.8 µs (8K/64 ms), while Self Refresh operates autonomously with CKE low and draws ≤2 mA (IDD6), retaining data without external clocking - essential for low-power system suspend states.

What is the function of the VREF pin on W9425G6JB-5I?

The VREF pin on W9425G6JB-5I provides a stable 1.25 V reference voltage for SSTL_2 input receivers. It must be maintained during all operational modes - including Self Refresh - to ensure correct logic-level interpretation of address, command, and control signals.

How many banks does W9425G6JB-5I have, and how are they selected?

W9425G6JB-5I has four independent memory banks. Bank selection is performed using the BA0 and BA1 inputs during command assertion - e.g., Bank Activate, Read, or Write - allowing interleaved access to improve effective bandwidth and hide row activation latency.

Is W9425G6JB-5I pin-compatible with standard 60-ball DDR SDRAM packages?

Yes, W9425G6JB-5I uses a JEDEC-standard 60-ball TFBGA package (8 mm × 13 mm, 0.8 mm pitch) with SSTL_2-compatible ball assignments. Its pinout matches industry-standard DDR SDRAM layouts, including dedicated VDDQ/VSSQ planes and differential CLK/CLK - enabling direct PCB footprint reuse in DDR400 designs.