Winbond Electronics Corporation W631GU8NB-12

Overview

W631GU8NB-12 from Winbond is a 1G-bit DDR3L SDRAM organized as 16M × 8 banks × 8 bits, operating at 800 MHz (DDR3L-1600) with CL=11, tRCD=13.75 ns, and tRP=13.75 ns. It delivers 12.8 GB/s peak bandwidth in dual-channel configurations and supports industrial temperature range (0°C to 95°C), making it suitable for embedded networking, industrial HMIs, and edge AI inference accelerators requiring low-voltage memory with JEDEC-compliant timing.

For engineers reviewing the W631GU8NB-12 datasheet, W631GU8NB-12 pinout, W631GU8NB-12 application, or W631GU8NB-12 equivalent, key selection considerations include DDR3L-1600 speed bin compliance, VDD/VDDQ = 1.283–1.45 V operation, programmable CAS Write Latency (CWL=5–8), ZQ calibration support, and VFBGA-78 package compatibility with standard DDR3L layout rules.

Technical Context

This device implements an 8-bit prefetch architecture with eight internal banks enabling concurrent access, DLL-aligned DQ/DQS timing, and source-synchronous differential strobe I/O. It supports posted CAS with additive latency (AL = 0, CL−1, CL−2), auto-precharge, and dynamic ODT for write data integrity.

Functional features include asynchronous RESET# for power-up initialization, multi-purpose register (MPR) for system-level timing calibration, write leveling for DQS-to-DQ skew compensation, and partial array self-refresh (PASR) to reduce power during idle bank subsets. It maintains backward compatibility with 1.5 V DDR3 systems via voltage-switching capability.

Key Specifications

Pinout & Package

VFBGA-78 package (8 mm × 10.5 mm, 1.0 mm height) with 0.8 mm ball pitch, window-type construction, and RoHS-compliant lead-free finish. Ball grid follows JEDEC MO-275AC standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR3L SDRAM applications.

Compared with MT41K128M8RH-125:E and IS43TR16128B-125KBL, the W631GU8NB-12 offers unique power savings via PASR and robust signal integrity through write leveling and dynamic ODT-critical for thermally constrained edge AI and portable medical designs where pin compatibility and 8-bit bus alignment are mandatory.

Availability

W631GU8NB-12 is available at Aetrix Electronics and suitable for industrial HMIs, network edge routers, AI inference accelerators, and medical imaging controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W631GU8NB-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 company specializing in specialty memory solutions, including NOR/NAND Flash, SRAM, and DRAM products for industrial, automotive, and communications markets.

The W631GU8NB series belongs to Winbond's DDR3L SDRAM product line, designed specifically for cost-sensitive, power-constrained embedded systems needing JEDEC-compliant low-voltage memory with industrial temperature support and advanced power management features.

FAQ

What is the maximum operating frequency and corresponding timing parameters for W631GU8NB-12?

The W631GU8NB-12 is rated for DDR3L-1600 operation at 800 MHz. Its guaranteed timing includes tRCD = 13.75 ns, tRP = 13.75 ns, and tAA = 13.75 ns at CL = 11. These values are validated across 0°C to 95°C case temperature with VDD/VDDQ = 1.283–1.45 V, meeting JEDEC JESD79-3F specification for the -12 speed grade.

Does W631GU8NB-12 support backward compatibility with standard 1.5 V DDR3 systems?

Yes, W631GU8NB-12 supports dual-voltage operation: it functions at 1.35 V nominal (DDR3L) and is fully backward compatible with 1.5 V ±0.075 V DDR3 systems. Voltage switching is managed externally; no internal register setting is required, but tREFI must be adjusted per temperature when operating at 1.5 V.

How does the write leveling feature work in W631GU8NB-12?

W631GU8NB-12 implements hardware-assisted write leveling using its Multi Purpose Register (MPR) and dedicated DQS training mode. The memory controller issues a MRS command to enter write leveling, then adjusts DQS delay until the DRAM echoes back a known MPR pattern aligned to CK. This calibrates DQS-to-DQ skew for reliable 1600 MT/s writes.

What power-saving modes are supported by W631GU8NB-12?

W631GU8NB-12 supports Precharged Power Down, Active Power Down, Auto Self-Refresh (ASR), and Partial Array Self-Refresh (PASR). PASR reduces IDD6 by up to 40% when only selected banks require retention; ASR automatically doubles refresh rate above 85°C, eliminating host software intervention for thermal management.

Is the VFBGA-78 package of W631GU8NB-12 compatible with standard DDR3L layout guidelines?

Yes, the W631GU8NB-12 uses a JEDEC-compliant VFBGA-78 package (8 mm × 10.5 mm, 0.8 mm pitch) identical in footprint and ball map to industry-standard DDR3L SDRAMs. Layout adherence to IPC-7351B Class L and JEDEC MO-275AC ensures drop-in compatibility with existing DDR3L routing and impedance-controlled stackups.