Winbond Electronics Corporation W9412G6IH-5

Overview

W9412G6IH from Winbond Electronics is a 2M × 4 banks × 16-bit DDR SDRAM operating at 200 MHz (tCK = 5 ns), compliant with DDR400/CL3 specification, supporting CAS latency of 2, 2.5, 3, or 4, and packaged in 66-pin TSOP II. It delivers up to 400 MT/s data bandwidth and is used as main memory in embedded computing and industrial control systems requiring synchronous burst-access storage.

For engineers reviewing the W9412G6IH datasheet, W9412G6IH pinout, W9412G6IH application, or W9412G6IH equivalent, key selection considerations include its SSTL_2 interface compliance, programmable burst length (2/4/8), differential clock input (CLK/CLK̅), DQS edge-/center-aligned timing for read/write, and support for auto-refresh and self-refresh modes in temperature-constrained environments.

Technical Context

This DDR SDRAM implements a 4-bank architecture with independent row activation and column access, enabling bank interleaving to hide tRCD and tRP delays. Its DLL (Delay-Locked Loop) synchronizes internal timing to external clocks, and mode register configuration sets CAS latency, burst length, and addressing mode before operation.

Command decoding relies on CS, RAS̅, CAS̅, and WE̅ inputs with defined truth tables; all address/control signals are sampled on the CLK/CLK̅ crossing point. Read and write operations use bidirectional DQS aligned to data edges (read) or center (write), while LDM/UDM provide per-byte write masking for DQ[7:0] and DQ[15:8], respectively.

Key Specifications

Pinout & Package

Packaged in 66-pin TSOP II (400 mil), lead-free and RoHS-compliant, with 0.5 mm pitch and standard JEDEC MO-143 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W9412G6IH, MT46V32M16P-5B offers superior high-speed routing but mandates PCB revision, while IS42S16400F-5BL provides true pin-to-pin compatibility and identical thermal/power characteristics-making it the lowest-risk alternative for production continuity.

Availability

W9412G6IH is available at Aetrix Electronics and suitable for industrial HMI panels, network edge routers, medical imaging controllers, and automated test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for W9412G6IH 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 manufacturer specializing in specialty memory, flash, and logic ICs, with over 30 years of DRAM design heritage and ISO 9001/TS 16949 certified manufacturing.

The W9412G6IH belongs to Winbond's DDR SDRAM product line, engineered for cost-sensitive, reliability-critical embedded systems where TSOP II packaging, industrial temperature tolerance, and JEDEC-compliant DDR400 performance are essential.

FAQ

What is the maximum clock frequency supported by the W9412G6IH?

The W9412G6IH supports a maximum clock frequency of 200 MHz, corresponding to a minimum clock cycle time (tCK) of 5 ns. This is validated for the -5 speed grade under DDR400/CL3 specifications, with operation guaranteed from 0°C to 70°C. The device achieves this using an internal DLL locked to the differential CLK/CLK̅ inputs, ensuring stable timing margins across process and voltage variations. W9412G6IH does not support 250 MHz operation unless explicitly rated for the -4 grade, which is not applicable to this specific part number.

Does the W9412G6IH support self-refresh mode, and what is its current draw in that state?

Yes, the W9412G6IH supports self-refresh mode, entered via the Self Refresh Entry command (RAS̅=L, CAS̅=L, WE̅=H, CKE=L). In this mode, the internal refresh controller maintains data retention without external clocking, and the DLL is automatically disabled. The maximum self-refresh current (IDD6) is 3 mA, enabling ultra-low-power operation during host sleep or power-loss scenarios. W9412G6IH requires VREF to remain stable during self-refresh, and exit requires CKE reassertion followed by 200 NOP cycles before issuing further commands.

How is write data masked on the W9412G6IH, and which pins control it?

Write data masking on the W9412G6IH is performed using two dedicated pins: LDM (pin 20) controls masking for DQ[7:0], and UDM (pin 43) controls masking for DQ[15:8]. When either signal is asserted high during a burst write, the corresponding 8-bit byte is masked and not written to the memory array. This enables efficient partial-word updates without requiring read-modify-write sequences. W9412G6IH synchronizes LDM/UDM to both edges of DQS, matching the data strobe timing for precise per-cycle masking control.

What package type and pin count does the W9412G6IH use, and is it RoHS-compliant?

The W9412G6IH uses a 66-pin TSOP II (Thin Small Outline Package) with 400 mil body width and 0.5 mm lead pitch, conforming to JEDEC MO-143 mechanical standards. It is lead-free and fully RoHS-compliant, utilizing environmentally safe materials in both die attach and lead finish. The package includes separate VDDQ/VSSQ rails for I/O noise isolation and NC pins (e.g., pins 14, 17, 19, 25, 42, 43, 50, 53) that must be tied to ground or left floating per datasheet guidance. W9412G6IH's TSOP II form factor supports wave soldering and is compatible with standard SMT assembly processes.

Can the W9412G6IH operate with a CAS latency of 2, and what are the timing implications?

Yes, the W9412G6IH supports CAS latency (CL) values of 2, 2.5, 3, and 4, configured via the Mode Register Set command. For CL = 2 operation, the minimum tCK is 6 ns (166 MHz), and tRCD(min) is 12 ns - stricter than CL = 3's 15 ns requirement. However, the -5 speed grade of W9412G6IH is specified for CL = 3 at 200 MHz; CL = 2 operation is only guaranteed for -6/-6I grades. Using CL = 2 on W9412G6IH may violate tRCD or tRP timing in high-speed designs and requires validation against actual board-level signal integrity. W9412G6IH's datasheet specifies CL = 2 parameters only for -6/-6I variants, not for the -5 suffix.