Winbond Electronics Corporation W66CM2NQUAGJ

Overview

W66CM2NQUAGJ from Winbond Electronics is a 4Gb LPDDR4X mobile SDRAM in 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 (ODT), ZQ calibration, and temperature-sensor-assisted refresh for power-constrained mobile and embedded applications.

For engineers reviewing the W66CM2NQUAGJ datasheet, W66CM2NQUAGJ pinout, W66CM2NQUAGJ application, or W66CM2NQUAGJ equivalent, this page delivers verified electrical specs, ball assignment mapping, LPDDR4X command timing compliance, thermal offset behavior, and validated alternative options for memory subsystem design and BOM optimization.

Technical Context

This device implements LPDDR4X JEDEC JESD209-4B-compliant signaling with differential CK/CK#, single-ended CA bus, and 16-bit DQ/DQS/DM interface. It supports 8 banks, burst lengths of BL16/BL32, and programmable MR registers (MR0–MR40) for fine-grained timing, ODT, and training control.

It features dual-rank DDP configuration with independent bank groups, CA VREF and DQ VREF training, write leveling, RD DQ calibration, and TRR (Target Row Refresh) to mitigate row hammer effects. Thermal offset compensation adjusts refresh intervals based on on-die sensor readings.

Key Specifications

Pinout & Package

W66CM2NQUAGJ uses a 200-ball Wafer-Level Fine-Pitch Ball Grid Array (WFBGA) package with 0.5 mm pitch, 8 mm × 12 mm body size, and 0.65 mm maximum height. Ball assignment follows JEDEC-standard LPDDR4X layout for DDP configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT53E2G32D2DS-046 and K4U6E3046M-BCGC, W66CM2NQUAGJ provides optimal balance of density, thermal-aware refresh, and standard LPDDR4X feature set without ECC or proprietary extensions-making it ideal for mainstream mobile and embedded platforms where JEDEC compliance and power efficiency are prioritized over redundancy or vendor-specific enhancements.

Availability

W66CM2NQUAGJ is available at Aetrix Electronics and suitable for smartphone application processor memory, tablet SoC main memory, automotive infotainment head units, and edge AI camera modules requiring stable component supply, long-term lifecycle support, and JEDEC-compliant LPDDR4X performance.

Supply support for W66CM2NQUAGJ 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, RAM, and trusted computing ICs, with global manufacturing and quality certifications.

W66CM2NQUAGJ belongs to Winbond's W66C LPDDR4X product line, designed specifically for high-efficiency, low-voltage mobile and embedded memory applications demanding JEDEC compliance, thermal adaptability, and compact packaging.

FAQ

What is the package type and dimensions of W66CM2NQUAGJ?

W66CM2NQUAGJ uses a 200-ball Wafer-Level Fine-Pitch Ball Grid Array (WFBGA) package measuring 8 mm × 12 mm with 0.5 mm ball pitch and maximum height of 0.65 mm. This DDP package integrates two 2Gb dies into a single footprint, enabling 4Gb density without increasing PCB area or signal routing complexity compared to dual-SDP layouts.

Does W66CM2NQUAGJ support LPDDR4X JEDEC JESD209-4B standard?

Yes, W66CM2NQUAGJ fully complies with JEDEC JESD209-4B for LPDDR4X, including differential clocking, 1.1 V I/O, 0.6 V core, VREF training, write leveling, and TRR mode. All timing parameters-including tCK, tRL, tWL, and tFAW-are validated per the standard, ensuring interoperability with certified host controllers such as those in Snapdragon and Dimensity SoCs.

What is the role of the on-die temperature sensor in W66CM2NQUAGJ?

The on-die temperature sensor in W66CM2NQUAGJ feeds real-time junction temperature data to the internal refresh controller, enabling dynamic adjustment of tRFC and TRR intervals. This reduces unnecessary refresh cycles at lower temperatures, cutting standby power by up to 25% in typical mobile use cases while maintaining data retention integrity across –25 °C to +85 °C.

How does W66CM2NQUAGJ handle command/address bus termination?

W66CM2NQUAGJ implements programmable on-die termination (ODT) for the CA bus via MR1 register settings. ODT_CA pin controls termination state, and MR1 bits [7:6] configure ODT resistance values (120 Ω, 60 Ω, or off). This eliminates need for external resistors and improves signal integrity during high-speed CA toggling, especially in multi-rank configurations.

Is W66CM2NQUAGJ pin-compatible with W66BM6NB?

No, W66CM2NQUAGJ is not pin-compatible with W66BM6NB. While both share the same 200-ball WFBGA package outline, W66BM6NB is a 2Gb SDP device with different internal bank mapping, CA bus timing, and MR register allocation. Ball functions for VDDQ, VDD, and ODT_CA differ between SDP and DDP variants, requiring distinct PCB layouts and initialization sequences.