Winbond Electronics Corporation W631GG8MB-12

Overview

W631GG8MB-12 from Winbond Electronics is a 1 Gbit DDR3 SDRAM organized as 16M × 8 banks × 8 bits, compliant with DDR3-1600 (11-11-11) timing, operating at 800 MHz clock frequency with 1.5 V supply, and packaged in a RoHS-compliant 78-ball VFBGA (8 mm × 10.5 mm). It serves as main memory or buffer storage in embedded controllers, networking processors, and industrial HMIs requiring high-bandwidth, low-latency synchronous DRAM.

For engineers reviewing the W631GG8MB-12 datasheet, W631GG8MB-12 pinout, W631GG8MB-12 application, or W631GG8MB-12 equivalent, key selection considerations include its DDR3-1600 speed bin, industrial-grade 0°C to 95°C case temperature range, programmable CAS latency (CL = 5–11), on-die termination (ODT), and ZQ calibration support for signal integrity in dense PCB layouts.

Technical Context

This device implements an 8-bit prefetch architecture with eight internal banks enabling concurrent access, differential CK/CK# and DQS/DQS# interfaces synchronized to SSTL_15 logic levels, and DLL-based alignment of data strobes to clock edges. It supports posted CAS with additive latency (AL = 0, CL−1, CL−2), auto-precharge, and dynamic ODT for write-data signal integrity.

Functional operation includes asynchronous RESET# for power-up initialization, multi-purpose register (MPR) readout for system-level timing calibration, write leveling for DQ-to-DQS skew compensation, and ZQ calibration using an external 240 Ω reference resistor to adjust output driver and ODT impedance across voltage/temperature variations.

Key Specifications

Pinout & Package

VFBGA-78 package with 8×10.5 mm² body, 1.0 mm thickness, lead-free and RoHS-compliant construction. Ball pitch: 0.8 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR3 SDRAM applications.

Compared with W631GG8MB-12, MT41K128M8RH-125:E offers lower voltage operation at the cost of non-drop-in supply compatibility, while IS43TR16128B-125KBL delivers doubled bandwidth via 16-bit bus but mandates PCB revision and controller reconfiguration.

Availability

W631GG8MB-12 is available at Aetrix Electronics and suitable for industrial HMIs, network packet processors, medical imaging controllers, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W631GG8MB-12 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 solutions including NOR/NAND Flash, SRAM, and DDR SDRAM for industrial, automotive, and communications markets.

The W631GG8MB series belongs to Winbond's industrial-grade DDR3 SDRAM product line, designed specifically for applications demanding robust thermal performance, JEDEC-compliant timing stability, and long-term supply assurance in mission-critical embedded systems.

FAQ

What is the maximum supported CAS latency for W631GG8MB-12?

The W631GG8MB-12 supports programmable CAS latency settings of CL = 5, 6, 7, 8, 9, 10, and 11. CL = 11 is the highest validated setting for DDR3-1600 operation, corresponding to a minimum tAA of 13.75 ns. Higher CL values (13, 14) are not supported in the -12 speed grade per datasheet Table 4.

Does W631GG8MB-12 support automatic self-refresh (ASR)?

Yes, W631GG8MB-12 supports Auto Self-Refresh (ASR) via MR2 bit A6. When enabled (MR2[A6] = 1), the device automatically adjusts refresh rate based on temperature sensor output, doubling refresh frequency to 3.9 µS intervals above 85°C - critical for maintaining data retention at TCASE up to 95°C without host intervention.

What is the purpose of the MPR in W631GG8MB-12?

The Multi-Purpose Register (MPR) in W631GG8MB-12 stores a predefined 128-bit calibration pattern used during system initialization. It enables write leveling and read DQ-DQS deskew by allowing the memory controller to read back a known sequence synchronized to DQS edges, facilitating precise timing margin optimization in high-speed layouts.

Can W631GG8MB-12 operate with a 1.35 V supply?

No, W631GG8MB-12 is specified for 1.5 V ± 0.075 V (1.425–1.575 V) operation only. It is not a DDR3L part and does not guarantee functionality or timing compliance at 1.35 V. Using 1.35 V may result in failed initialization, data corruption, or premature wear due to insufficient gate overdrive.

What ball count and package type does W631GG8MB-12 use?

W631GG8MB-12 uses a 78-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package measuring 8 mm × 10.5 mm with 0.8 mm ball pitch and 1.0 mm overall height. This RoHS-compliant, lead-free package is optimized for automated SMT assembly and high-density routing in industrial PCBs.