W634GU6RB-11 4Gb DDR3L SDRAM: Specs, Design Guide, and Alternatives

Quick Answers: What Is the W634GU6RB-11 and What Are Its Key Verified Specs?

The W634GU6RB-11 is a 4Gbit DDR3L SDRAM from Winbond, organized as 256M x 16 bits. It operates at a clock frequency of 933 MHz (DDR3L-1866) with a CAS latency of 20 ns, and is supplied in a 96-ball VFBGA (7.5x13 mm) package. This device is designed for low-power applications, operating from a 1.35V supply (1.283V to 1.45V range), and supports parallel interface with a data rate of 1866 MT/s. As of 2026-08-25, the W634GU6RB-11 is in active lifecycle status with 99,999 units in stock at XAIPART, priced at $13.5227 per unit for quantities of 1000 or more.

Technical Guide: How to Select, Design In, and Use the W634GU6RB-11

When designing with the W634GU6RB-11, ensure proper decoupling capacitors are placed near the VDD and VDDQ pins to minimize noise. Also, follow the JEDEC DDR3L layout guidelines for signal integrity, especially for high-speed signals. The device supports a 1.35V supply, so verify that the power management IC provides a stable 1.35V rail.

The W634GU6RB-11 includes several features that enhance signal integrity and simplify system design: auto self-refresh, auto precharge, data mask, write leveling, ZQ calibration, asynchronous reset, and dynamic on-chip termination (ODT). These features are particularly useful in multi-rank configurations and high-speed buses.

For power-sensitive designs, the 1.35V supply reduces power consumption by about 20% compared to standard 1.5V DDR3, making it ideal for always-on networking equipment and embedded systems.

Alternatives & Comparison: Drop-In Replacements for W634GU6RB-11

Based on the verified data, the W634GU6RB11I is the industrial temperature grade version with identical specifications and package. Other pin-compatible alternatives include W634GU6RB-12 and W634GU6RB-09, which differ in speed grade. The Samsung K4B4G1646E-BYMATCV is also pin-compatible, but verify timing parameters before substitution.

Summary: The W634GU6RB11I is the closest drop-in replacement with identical specs. The W634GU6RB-12 is a lower-speed alternative (800 MHz) that can be replaced by the -11 if the system tolerates higher speed. For the Samsung part, verify timing parameters before substitution.

Industry Insight: Market Position, Lifecycle, and Supply Situation

The W634GU6RB-11 is in active lifecycle status, indicating ongoing production and availability. As of 2026-08-25, XAIPART holds 99,999 units in stock, with a base price of $13.5227 at quantity 1000+. This suggests a stable supply situation. The device is RoHS compliant and halogen-free, aligning with environmental regulations. [DATA_NEEDED: market share or competitive positioning data]

Trends & Outlook: What Buyers Should Watch

Buyers should monitor the availability of industrial temperature grade variants like the W634GU6RB11I, which offer the same specs but wider temperature range. The trend toward lower voltage (1.35V) and higher density (4Gb) memory continues, driven by power-sensitive applications in networking and embedded systems. The W634GU6RB-11's 1866 MT/s data rate and 20 ns CAS latency position it well for high-bandwidth tasks. Watch for potential speed grade upgrades (e.g., -09) that may offer higher performance, but verify compatibility.