Winbond Electronics Corporation W957A8MFYA5I TR

Overview

W957A8MFYA5I from Winbond Electronics is a 128Mb (16MB) HyperRAM device operating at 3.0V VCC/VCCQ, featuring an 8-bit DDR HyperBus interface, 200MHz clock rate (400 MT/s), and Dual-Die-Package (DDP) in 24-ball TFBGA. It serves as high-speed, low-pin-count external memory for microcontrollers and SoCs in graphics, firmware, and real-time data buffering applications.

For engineers reviewing the W957A8MFYA5I datasheet, W957A8MFYA5I pinout, W957A8MFYA5I application, or W957A8MFYA5I equivalent, key selection criteria include its 3.0V operation, configurable burst modes (linear/wrapped/hybrid), Hybrid Sleep and Deep Power Down power states, RWDS-based latency signaling, and DDP architecture enabling 128Mb density in compact footprint.

Technical Context

The W957A8MFYA5I implements a dual-die HyperBus interface with independent 64Mb dies stacked in one 24-ball TFBGA package. It supports both single-ended (CK only) and differential (CK/CK#) clocking, and uses RWDS bidirectionally - as latency indicator during Command/Address phase and as read strobe/write mask during data transfer.

Its functional block includes configurable initial/fixed latency, partial array refresh, hybrid burst (wrapped + linear), and register-mapped configuration (CR0/CR1) for drive strength, deep power down, and master clock type. Memory space addressing spans 128Mb across two dies with die-select logic embedded in address mapping.

Key Specifications

Pinout & Package

W957A8MFYA5I uses a 24-ball TFBGA package (5×5 mm, 1-ball footprint) with Dual-Die-Package architecture. All balls are assigned per Winbond's official ball map; RFU balls must remain unconnected on PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed serial RAM applications.

Compared with W957D8MFYA5I and IS66WV1288GALL-100BLLI, the W957A8MFYA5I uniquely balances 3.0V compatibility, 24-ball footprint, and DDR HyperBus efficiency - making it optimal for new industrial and automotive designs prioritizing pin count, power, and bandwidth simultaneously.

Availability

W957A8MFYA5I is available at Aetrix Electronics and suitable for graphics frame buffers, firmware code execution, real-time data logging, and industrial edge sensor hubs requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for W957A8MFYA5I 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 SPI NOR, NAND, and high-performance serial interfaces like HyperRAM and Octal Flash.

The W957A8MFYA5I belongs to Winbond's HyperRAM family - designed specifically to replace parallel PSRAM and SRAM in bandwidth-constrained, pin-limited embedded systems while maintaining simplicity and low power.

FAQ

What is the operating voltage range for W957A8MFYA5I?

The W957A8MFYA5I operates at a fixed 3.0V supply for both VCC and VCCQ, as confirmed in Winbond's Order Information table. This distinguishes it from the 1.8V W957D8MFYA5I variant. The 3.0V specification ensures compatibility with common industrial I/O rails and eliminates need for level-shifting circuitry in 3V-system designs. W957A8MFYA5I does not support dual-voltage operation or voltage scaling.

Does W957A8MFYA5I support differential clocking?

Yes, W957A8MFYA5I supports both differential (CK/CK#) and single-ended (CK-only) clocking modes. The CK# pin is fully functional and required for differential operation, which improves noise immunity and timing margin in electrically noisy environments. CK-only mode simplifies routing when board layout constraints limit differential pair implementation. Both modes are supported without hardware modification to the W957A8MFYA5I device itself.

How does the RWDS signal function in W957A8MFYA5I read versus write operations?

In W957A8MFYA5I, RWDS acts as a bidirectional signal with distinct roles: during Command/Address phase, it outputs to indicate additional refresh latency; during read data transfer, it serves as a source-synchronous read strobe with data edge-aligned to RWDS transitions; during write data transfer, it functions as a byte-level mask (High = masked, Low = valid). This dual-role design eliminates need for separate strobe and mask lines, reducing pin count while preserving timing precision.

Is W957A8MFYA5I pin-compatible with W957D8MFYA5I?

Yes, W957A8MFYA5I and W957D8MFYA5I share identical 24-ball TFBGA package, pin assignment, and mechanical footprint. They differ only in supply voltage (3.0V vs. 1.8V) and associated DC characteristics - all signals, timing parameters, register maps, and HyperBus protocol behavior are functionally identical. This allows direct substitution in PCB layouts where voltage rail matches the selected variant.

What power-saving modes are available in W957A8MFYA5I?

W957A8MFYA5I supports three defined power-saving states: Interface Standby (low-current idle with clocks stopped), Hybrid Sleep Mode (HSM - retains memory contents with sub-100µA current and <1µs wake-up), and Deep Power Down (DPD - lowest current draw, requires full reinitialization on wake). These modes are controlled via Configuration Register 0 and enable fine-grained energy management aligned to application workload cycles - critical for battery-backed and thermally sensitive deployments.