Winbond Electronics Corporation W9412G6JB-5

Overview

W9412G6JB-5 from Winbond is a 2M × 4 banks × 16-bit DDR SDRAM operating at up to 200 MHz (DDR400), with CAS Latency 3, 2.5V ±0.2V supply, and SSTL_2 interface - designed for main memory in embedded computing, industrial controllers, and legacy PC-compatible systems requiring stable low-power DRAM.

For engineers reviewing the W9412G6JB-5 datasheet, W9412G6JB-5 pinout, W9412G6JB-5 application, or W9412G6JB-5 equivalent, key selection factors include its -5 speed grade (DDR400/CL3), 60-ball TFBGA package, differential clock support, programmable burst length (2/4/8), and self-refresh capability at ≤2 mA.

Technical Context

This DDR SDRAM implements a double-data-rate architecture synchronized to both edges of DQS, with edge-aligned read data and center-aligned write data. It supports bank-interleaved operations across four independent 2M-word banks and uses a DLL for clock skew compensation - enabled via EMRS during initialization.

Command decoding relies on multiplexed address pins (A0–A11) and bank-select inputs (BA0/BA1), with mode register configuration defining CAS latency, burst length, and addressing mode. Refresh is handled via auto-refresh (tREFI = 64 ms) or self-refresh (IDD6 ≤ 2 mA), both compliant with JEDEC Standard No. 21-C.

Key Specifications

Pinout & Package

W9412G6JB-5 is housed in a RoHS-compliant 60-ball Thin Fine-Pitch BGA (TFBGA) package measuring 8 mm × 13 mm with 0.8 mm ball pitch. Power and signal integrity are enhanced by separate VDDQ/VSSQ rails for I/O buffers and dedicated VREF for SSTL_2 input threshold referencing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46V32M16-5B:J and K4H511638D-UCB3, W9412G6JB-5 offers identical DDR400/CL3 performance in a functionally compatible 60-ball TFBGA, but with narrower temperature grading and Winbond-specific DLL initialization - making it optimal for cost-sensitive, volume-manufactured legacy DDR systems where second-source flexibility is secondary to qualification continuity.

Availability

W9412G6JB-5 is available at Aetrix Electronics and suitable for industrial HMI systems, legacy embedded PCs, and network edge appliances requiring stable component supply, long-lifecycle support, and JEDEC-compliant DDR SDRAM functionality.

Supply support for W9412G6JB-5 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, flash storage, and microcontrollers, with over 30 years of DRAM design heritage.

W9412G6JB-5 belongs to Winbond's DDR SDRAM product line, engineered for cost-effective, reliable main memory in industrial and embedded systems where DDR I compatibility, thermal robustness, and long-term manufacturability are primary design goals.

FAQ

What is the maximum clock frequency supported by W9412G6JB-5?

W9412G6JB-5 supports a maximum clock frequency of 200 MHz, corresponding to DDR400 data transfer rates. This is defined by its -5 speed grade and confirmed by tCK = 5 ns minimum in the datasheet's KEY PARAMETERS table. The device must operate within this limit to meet CL3 timing specifications and avoid setup/hold violations on address, command, and data signals.

Does W9412G6JB-5 support self-refresh mode, and what is its typical current draw?

Yes, W9412G6JB-5 supports self-refresh mode with a maximum current draw of 2 mA, as specified in the IDD6 parameter under KEY PARAMETERS. This low-current state allows the device to retain memory contents without external clocks or commands, making it suitable for battery-backed or low-power suspend applications where system-level power gating is required.

What package type and ball count does W9412G6JB-5 use?

W9412G6JB-5 uses a 60-ball Thin Fine-Pitch BGA (TFBGA) package measuring 8 mm × 13 mm with 0.8 mm ball pitch. This is explicitly stated in Section 2 (FEATURES) and detailed in Section 13 (Package Specification) of the datasheet, and matches the ball configuration diagram in Section 5.

How is burst length configured on W9412G6JB-5?

Burst length on W9412G6JB-5 is configured via the Mode Register Set (MRS) command, using address bits A2–A0. Supported lengths are 2, 4, or 8, with sequential or interleaved addressing selectable via A3. This configuration must be performed during power-up initialization and remains active until reprogrammed - no dynamic change during operation is supported.

What is the role of the VREF pin on W9412G6JB-5, and is it required in self-refresh mode?

The VREF pin on W9412G6JB-5 provides a stable 1.25V reference for SSTL_2 input thresholding of address, command, and control signals. As stated in Section 8.2.14, VREF must be maintained during self-refresh mode because CKE is an SSTL_2 input - failure to hold VREF risks incorrect command interpretation upon self-refresh exit.