Winbond Electronics Corporation W66CQ2NQUAFJ

Overview

W66CQ2NQUAFJ from Winbond Electronics is a 2Gb LPDDR4X SDRAM in a 200-ball WFBGA package, operating at 4266 Mbps data rate with 1.1 V I/O and 0.6 V core supply. It supports dual-die-package (DDP) architecture, on-die termination, ZQ calibration, and temperature-sensor-assisted refresh for mobile and embedded applications requiring high bandwidth and low power.

For engineers reviewing the W66CQ2NQUAFJ datasheet, W66CQ2NQUAFJ pinout, W66CQ2NQUAFJ application, or W66CQ2NQUAFJ equivalent, key selection criteria include LPDDR4X compliance, 200-ball WFBGA footprint compatibility, 4266 Mbps transfer rate, VREF training support, and thermal-aware self-refresh behavior in space-constrained portable designs.

Technical Context

This device implements a full LPDDR4X-compliant interface with dual-channel 16-bit x2 configuration, supporting burst lengths of BL16 and BL32. It features programmable mode registers (MR0–MR40), CA/DQ VREF training, command bus training, and write leveling to ensure signal integrity at high speeds.

The W66CQ2NQUAFJ integrates per-bank refresh, partial array self-refresh (PASR), and TRR (Target Row Refresh) to reduce power during idle states while maintaining data retention across temperature gradients. Its DQS interval oscillator enables precise timing control for read/write strobe alignment without external calibration hardware.

Key Specifications

Pinout & Package

W66CQ2NQUAFJ uses a 200-ball Wafer-Level Fine-Pitch Ball Grid Array (WFBGA) package with 0.65 mm ball pitch. Pin assignments follow JEDEC-standard LPDDR4X ball mapping for single-die-package (SDP) configuration as defined in Section 4.1 of the datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LPDDR4X memory applications.

Compared with MT53E256M32D2DS-053 WT:A and K4U6E3046E-OCMA, the W66CQ2NQUAFJ offers finer-grained TRR control and lower standby current in PASR mode, making it optimal for thermally constrained mobile SoC platforms where dynamic power management outweighs ECC or extended temperature needs.

Availability

W66CQ2NQUAFJ is available at Aetrix Electronics and suitable for smartphone application processor memory, tablet GPU frame buffers, automotive infotainment head units, and industrial edge AI camera modules requiring stable component supply and long-term LPDDR4X roadmap support.

Supply support for W66CQ2NQUAFJ 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 Flash, RAM, and trusted computing ICs, with global manufacturing and quality certifications.

The W66CQ2NQUAFJ belongs to Winbond's W66CQ2NQ LPDDR4X product line, designed specifically for power-constrained mobile and embedded systems needing JEDEC-compliant high-speed DRAM with advanced thermal and timing adaptability.

FAQ

What is the maximum data rate supported by the W66CQ2NQUAFJ?

The W66CQ2NQUAFJ supports a maximum data rate of 4266 Mbps (2133 MHz clock frequency) in double-data-rate mode. This performance level meets JEDEC LPDDR4X JESD209-4B specifications and is validated across the full commercial temperature range. The W66CQ2NQUAFJ achieves this speed using differential CK and DQS signaling, on-die termination, and calibrated VREF references to maintain signal integrity at high frequencies.

Does the W66CQ2NQUAFJ support on-die termination (ODT) for both command/address and data buses?

Yes, the W66CQ2NQUAFJ supports configurable on-die termination for both the command/address (CA) bus and the DQ/DQS/DMI data bus. ODT settings are controlled via mode registers MR1 and MR2, allowing dynamic enable/disable during read/write operations. This capability eliminates the need for external termination resistors and improves signal integrity in high-speed layouts, especially critical for the W66CQ2NQUAFJ's 4266 Mbps operation.

What package type and dimensions does the W66CQ2NQUAFJ use?

The W66CQ2NQUAFJ uses a 200-ball Wafer-Level Fine-Pitch Ball Grid Array (WFBGA) package measuring 10 mm × 12 mm × 0.55 mm with 0.65 mm ball pitch. This compact, low-profile package is optimized for thin mobile PCBs and matches JEDEC-standard LPDDR4X SDP footprints. The W66CQ2NQUAFJ's mechanical drawing and solder paste stencil recommendations are provided in Section 4.1 of its official datasheet.

How does the W66CQ2NQUAFJ handle thermal variations during operation?

The W66CQ2NQUAFJ incorporates an integrated temperature sensor and thermal offset compensation logic that dynamically adjusts refresh intervals based on die temperature. This feature enables accurate data retention across -25°C to +85°C without over-refreshing at low temperatures or risking loss at high temperatures. The W66CQ2NQUAFJ also supports Partial Array Self-Refresh (PASR) to further reduce power when only portions of memory are active.

Is the W66CQ2NQUAFJ pin-compatible with other Winbond LPDDR4X devices like the W66BQ6NB?

No, the W66CQ2NQUAFJ is not pin-compatible with the W66BQ6NB. While both share the same 200-ball WFBGA package outline, the W66BQ6NB is a 4Gb dual-die-package (DDP) device with different internal bank organization, CA bus timing, and mode register layout. The W66CQ2NQUAFJ is a 2Gb single-die-package (SDP) part with distinct ball assignment and electrical characteristics - direct substitution would require PCB and firmware changes.