Winbond Electronics Corporation W9825G6JB-6I TR

Overview

W9825G6JB-6I TR from Winbond is a 4M × 4 banks × 16-bit synchronous DRAM (SDRAM) operating at 166 MHz with CAS Latency 3, 3.3V LVTTL interface, and industrial temperature range (–40°C to +85°C). It delivers 166 million words/second bandwidth and supports burst lengths of 1, 2, 4, 8, or full page for embedded main memory in real-time control systems.

For engineers reviewing the W9825G6JB-6I TR datasheet, W9825G6JB-6I TR pinout, W9825G6JB-6I TR application, or W9825G6JB-6I TR equivalent, key selection criteria include guaranteed industrial-temperature operation, TFBGA-54 package compatibility, self-refresh power management, and precise tRCD/tRP/tRC timing compliance for deterministic memory controller design.

Technical Context

This SDRAM implements four independent 4M-word banks with interleaved access capability to hide precharge latency. Its programmable Mode Register configures burst type (sequential/interleave), length, and CAS latency-enabling optimization for sequential streaming or random-access workloads.

It supports auto-precharge, controlled precharge, and self-refresh modes with 8K refresh cycles per 64 ms. The device uses separate VDDQ/VSSQ rails to isolate I/O noise and requires strict CKE-controlled entry/exit from Power Down and Clock Suspend modes.

Key Specifications

Pinout & Package

W9825G6JB-6I TR uses a 54-ball thin fine-pitch BGA (TFBGA) package with 8 mm × 8 mm body size and 0.8 mm ball pitch. Ball assignments follow JEDEC-standard SDRAM pinout conventions with dedicated address, bank select, command, clock, data, and power/ground terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS42S16400J-6BLI and MT48LC16M16A2P-6A:G, W9825G6JB-6I TR offers identical speed-grade performance in a smaller TFBGA footprint with validated industrial temperature support - making it optimal for new space- and reliability-constrained designs where pinout reuse is possible.

Availability

W9825G6JB-6I TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS loggers, medical imaging controllers, avionics display buffers, and real-time embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W9825G6JB-6I TR 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, SRAM, and SDRAM for industrial, automotive, and computing markets.

W9825G6JB-6I TR belongs to Winbond's industrial-grade SDRAM product line, designed specifically for high-reliability embedded applications demanding guaranteed operation from –40°C to +85°C with robust timing margins and long-term supply assurance.

FAQ

What is the maximum supported clock frequency for W9825G6JB-6I TR?

W9825G6JB-6I TR is rated for 166 MHz operation with CAS Latency 3, as confirmed by its speed grade suffix "-6I" and electrical characterization in Section 9.5 of the datasheet. This frequency defines the upper limit for command issuance and data transfer rates, and must be maintained with tCK ≥ 6 ns and proper setup/hold timing on all control and address signals relative to CLK.

Does W9825G6JB-6I TR support self-refresh mode, and how is it initiated?

Yes, W9825G6JB-6I TR supports self-refresh mode. It is initiated by asserting /CS, /RAS, /CAS, and CKE low while holding /WE high on a CLK rising edge. Once entered, the device internally manages all refresh cycles using its on-chip timer, and CKE must remain low until exit. Exit occurs when CKE returns high, followed by tXSR delay before accepting new commands.

What is the function of the LDQM and UDQM pins on W9825G6JB-6I TR?

LDQM (Lower Data Queue Mask) and UDQM (Upper Data Queue Mask) provide byte-level write masking for the 16-bit DQ bus. When sampled high during a write cycle, LDQM masks DQ0–DQ7 and UDQM masks DQ8–DQ15, blocking corresponding byte writes with zero latency. During read cycles, they place the respective DQ byte outputs in high-impedance state after CAS latency delay.

Is W9825G6JB-6I TR pin-compatible with other Winbond SDRAMs like W9825G6KH?

No, W9825G6JB-6I TR is not pin-compatible with W9825G6KH. Although both are 128 Mbit SDRAMs, W9825G6KH uses a 60-ball TFBGA package with different ball assignment (e.g., additional VDD/VSS balls), whereas W9825G6JB-6I TR uses 54-ball TFBGA with distinct pin mapping per Section 4 and 5 of its datasheet - requiring separate PCB layout.

What does the "TR" suffix indicate in W9825G6JB-6I TR?

The "TR" suffix in W9825G6JB-6I TR denotes tape-and-reel packaging format per JEDEC standards - indicating the part is supplied on embossed plastic carrier tape in standard 13-inch reels, optimized for automated SMT placement. It does not affect electrical or thermal specifications; the "-6I" portion defines speed grade and temperature rating.