Winbond Electronics Corporation W9425G6KH-5I

Overview

W9425G6KH-5I 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 industrial temperature range (–40°C to +85°C). It delivers up to 400 million words per second bandwidth and supports auto-refresh, self-refresh, and power-down modes for embedded main memory applications.

For engineers reviewing the W9425G6KH-5I datasheet, W9425G6KH-5I pinout, W9425G6KH-5I application, or W9425G6KH-5I equivalent, key selection considerations include its TSOP II-66 package, SSTL_2 interface compliance, differential clock (CLK/CLK#) timing, DQS edge/center alignment behavior, and industrial-grade thermal reliability across DDR400/CL3 operation.

Technical Context

This DDR SDRAM implements a double-data-rate architecture synchronized to both edges of DQS, with programmable burst lengths (2/4/8) and addressing modes (sequential/interleave) via mode registers. Its DLL-based timing control enables precise data capture during read operations and center-aligned write strobing.

The device features bank-select architecture with four independent 16-bit-wide banks, supporting concurrent activation and interleaved access. Command decoding relies on CS, RAS, CAS, and WE inputs referenced to the crossing point of CLK and CLK#, while CKE governs entry/exit from power-down and self-refresh states.

Key Specifications

Pinout & Package

W9425G6KH-5I is housed in a 66-pin Thin Small Outline Package (TSOP II), with dedicated VDD/VSS for core logic and isolated VDDQ/VSSQ for I/O buffers to minimize switching noise. Pin functions follow JEDEC-standard DDR SDRAM assignment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V32M16-5B:J and IS42S16400J-5BL, W9425G6KH-5I uniquely combines industrial temperature operation, TSOP II compatibility, and Winbond's proven DDR SDRAM reliability-making it optimal for field-deployed equipment where long-term stability and drop-in manufacturability are required.

Availability

W9425G6KH-5I is available at Aetrix Electronics and suitable for industrial HMI systems, network edge routers, medical diagnostic devices, and automated test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for W9425G6KH-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 communications markets.

The W9425G6KH series belongs to Winbond's legacy DDR SDRAM product line, designed specifically for cost-effective, thermally robust main memory in resource-constrained embedded systems requiring JEDEC-compliant DDR interfaces.

FAQ

What is the maximum clock frequency supported by W9425G6KH-5I?

W9425G6KH-5I supports a maximum clock frequency of 200 MHz, corresponding to DDR400 operation with a minimum clock cycle time (tCK) of 5 ns at CAS latency 3. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) under specified 2.5 V ±0.2 V supply conditions. The device uses a DLL to maintain timing accuracy at this rate.

Does W9425G6KH-5I support both auto-refresh and self-refresh modes?

Yes, W9425G6KH-5I supports both auto-refresh and self-refresh modes. Auto-refresh requires external issuance every 7.8 µs on average (8K cycles per 64 ms), while self-refresh operates autonomously with CKE held low and draws ≤2 mA. During self-refresh, the DLL is disabled and must be reset upon exit, requiring ≥200 clock cycles before valid reads.

What is the function of the LDM and UDM pins on W9425G6KH-5I?

The LDM (Lower Data Mask) and UDM (Upper Data Mask) pins on W9425G6KH-5I provide byte-level write masking: LDM controls DQ0–DQ7 and UDM controls DQ8–DQ15. When asserted high during a write burst, they mask the corresponding 8-bit lane, enabling partial writes without read-modify-write sequences. Both signals are sampled synchronously with DQS edges.

How does W9425G6KH-5I handle differential clock inputs CLK and CLK#?

W9425G6KH-5I samples all address and command inputs (except DQ, DM, and CKE) on the crossing point of CLK and CLK#, which defines the positive clock edge. This differential input structure improves noise immunity and timing margin. The internal DLL locks to this edge to align DQS for read data capture and center DQS for write data strobing.

What package type is used for W9425G6KH-5I and what are its key mechanical features?

W9425G6KH-5I uses a 66-pin TSOP II (Thin Small Outline Package) with lead-free, RoHS-compliant construction. Key features include gull-wing leads for surface-mount assembly, separate VDDQ/VSSQ power/ground pairs for I/O noise isolation, and standardized pinout aligned with JEDEC DDR SDRAM specifications - enabling direct replacement in existing DDR memory layouts.