K4B4G1646E-BYMA: The Definitive 4Gb DDR3L SDRAM Guide for Engineers and Buyers

Quick Answers: What Is the K4B4G1646E-BYMA and Why Does It Matter?

The Samsung K4B4G1646E-BYMA is a 4Gb DDR3L SDRAM organized as 256M x 16, operating at 1.35V (1.28V–1.575V) with a data rate of 1866 Mbps/pin (933 MHz clock). It comes in a 96-ball FBGA package, is RoHS compliant, and has an active lifecycle status. As of 2026-08-23, the base price is $14.3182 at 1,000+ units, with 99,999 units in stock at XAIPART and an MOQ of 1. This low-power, high-density memory is ideal for laptops, networking equipment, industrial computing, embedded systems, data center servers, and consumer electronics.

Engineers choose the K4B4G1646E-BYMA for its balance of speed, power efficiency, and proven Samsung E-die reliability. Its 1.35V operation reduces power consumption compared to 1.5V DDR3, while the 1866 Mbps data rate supports demanding applications. The FBGA-96 package enables compact PCB designs, and JEDEC-standard features like dynamic on-chip termination (DTC) and ZQ calibration ensure signal integrity.

Technical Guide: How to Select, Design In, and Use the K4B4G1646E-BYMA

Key Specifications at a Glance

All values are verified from the XAIPART database as of 2026-08-23.

Selecting the Right DDR3L for Your Design

When choosing a DDR3L SDRAM, consider density, organization, speed grade, voltage, temperature range, and package. The K4B4G1646E-BYMA offers 4Gb density in a x16 configuration, which is ideal for applications requiring high bandwidth per chip. Its 1866 Mbps data rate meets the needs of modern processors and networking chips. The 1.35V supply reduces power, and the 0°C to +95°C range suits industrial environments.

For designs that need higher density, you might consider stacking multiple devices or using a different organization. However, the x16 bus width simplifies routing and reduces the number of chips needed for a given capacity.

Designing In the K4B4G1646E-BYMA

Follow these best practices when integrating the K4B4G1646E-BYMA:

• Power Supply: Provide a stable 1.35V supply with proper decoupling capacitors near the VDD and VDDQ pins. The device supports a range of 1.28V to 1.575V, so ensure your regulator stays within this window.
• Reference Voltage: Generate VREFCA and VREFDQ accurately (typically 0.675V for 1.35V operation) using a resistor divider or dedicated reference buffer.
• Signal Integrity: Route DQ, DQS, and address/command lines with controlled impedance (e.g., 50Ω single-ended, 100Ω differential) and maintain proper spacing to minimize crosstalk. Use the ZQ calibration feature to adjust output drive strength.
• On-Die Termination (ODT): Configure ODT settings via mode registers to match your system's topology and improve signal quality.
• Thermal Management: The device operates up to +95°C, but ensure adequate airflow or heatsinking in high-density designs to keep junction temperature within limits.
• Layout Guidelines: Follow the layout recommendations in the datasheet, including via placement and ground planes, to reduce parasitic inductance.

Using the K4B4G1646E-BYMA in Your System

Integrate the device with your memory controller, ensuring that timing parameters (CAS latency, tRCD, tRP) are programmed correctly. The device supports auto precharge and asynchronous reset, simplifying control. Use the temperature sensor for thermal monitoring if available.

For power-sensitive designs, the 1.35V operation reduces consumption by up to 20% compared to 1.5V DDR3 [VERIFY_NEEDED: claim about 20% reduction is from product description, not independently verified].

Alternatives & Comparison: Drop-In Replacements for the K4B4G1646E-BYMA

Several drop-in alternatives exist, but verify timing parameters and temperature grades before substitution. The following table compares the K4B4G1646E-BYMA with alternatives from the XAIPART database.

Note: The K4B4G1646E-BYK000 is the same die and package with a different ordering suffix, making it a direct drop-in. The K4B4G1646E-BCMA has a different temperature grade, so verify suitability. Cross-brand options like the MT41K512M16HA-125 and H5TQ4G63CFR-PBC are JEDEC-standard and pin-compatible, but always confirm timing parameters. The AS4C256M16D3LC-10BCN from Alliance Memory offers a long-lifecycle supply option.

Industry Insight: Market Position, Lifecycle, and Supply Situation

The K4B4G1646E-BYMA has an active lifecycle status, indicating ongoing production and availability. As of 2026-08-23, XAIPART holds 99,999 units in stock, with an MOQ of 1, ensuring immediate availability for prototyping and production. The base price is $14.3182 at 1,000+ units, with tiered pricing from $24.5455 at qty 1 to $15 at qty 500.

DDR3L remains relevant in legacy and cost-sensitive designs, particularly in industrial and networking equipment where long product lifecycles are common. Samsung's E-die process technology provides a mature, reliable solution. However, the industry is transitioning to DDR4 and DDR5 for new high-performance designs. Buyers should monitor availability trends, as DDR3L production may eventually decline. [DATA_NEEDED: Market share data for DDR3L vs DDR4/DDR5]

Trends & Outlook: What Buyers Should Watch

While DDR3L is a mature technology, it continues to serve specific niches. Buyers should watch for:

• Supply Stability: With active lifecycle and ample stock at XAIPART, current supply is stable. However, as fabs shift to newer memory types, DDR3L availability may tighten. Plan for long-term requirements.
• Price Fluctuations: Memory prices are cyclical. The current price of $14.3182 at 1k units (as of 2026-08-23) may change. Consider locking in pricing for volume orders.
• Alternative Sources: Cross-brand alternatives like Micron and SK Hynix provide second-source options, but verify compatibility.
• Design Migration: For new designs, evaluate DDR4 or DDR5 for future-proofing, but for existing designs, the K4B4G1646E-BYMA remains a reliable choice.

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