W83L951ADG - Mobile Keyboard Embedded Controller | Winbond
部品番号: W83L951ADG ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.25 | $4,250.00 |
W83L951ADG 概要
An embedded controller (EC) is a specialized microcontroller in the power-management hierarchy of a computer system: it is a dedicated, always-on processor that supervises the keyboard matrix, power sequencing, battery charging supervision, thermal sensing, and low-level I/O even while the main CPU is asleep or off. In laptop and mobile designs the EC is the first silicon to wake and the last to sleep, making its firmware and electrical behavior critical to system reliability.
Key features of the W83L951ADG include the 8051-derived instruction-set core with embedded firmware memory, an integrated keyboard controller (KBC) compatible with legacy PC/AT keyboard and PS/2 interfaces, general-purpose I/O for board-level control, and low-power CMOS operation suited to battery-powered systems. The device communicates with the host chipset over an LPC (Low Pin Count) style interface used in legacy EC architectures, allowing ACPI-compliant power management event handling.
Architecturally, the part follows the classic Winbond/Nuvoton EC family: a single-chip design combining the CPU, program memory, RAM, keyboard matrix scanner, host interface, timers, and GPIO banks, minimizing external component count in dense mobile motherboards. The LQFP-128 package with 0.4 mm lead pitch provides the pin count needed for large keyboard matrix scanning plus numerous GPIO without a larger footprint.
Typical applications include laptop and notebook keyboard controllers, embedded system management in x86 mobile platforms, tablet and portable device keyboard scanning, and industrial legacy designs that require PC/AT-compatible KBC functionality.
Design consideration: because this device is long past active production, verify remaining authorized stock and confirm firmware compatibility before committing it to a new build; legacy designs should plan a migration path to current Nuvoton EC families.
This page synthesizes distributor sourcing data, datasheet availability, drop-in variant information, and practical obsolescence guidance not consolidated in the manufacturer datasheet.
ドロップイン代替品: W83L951ADG — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
W83L951ADG-A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W83L951ADG
✅ ドロップイン✓ 在庫あり
$4.25 / 個
データシートを見る →W83L950ADG
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
W83L951ADG-T
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
W83L951ADG 最大定格＆電気的特性
| Product Type | Mobile Keyboard and Embedded Controller |
| Core Architecture | 8051-compatible embedded controller core |
| Process Technology | CMOS |
| パッケージ | LQFP-128 (PQFP128) |
| 実装タイプ | Surface Mount |
| ピン数 | 128 |
| Keyboard Controller | Integrated PC/AT-compatible KBC |
| Manufacturer Successor | Nuvoton Technology (Winbond EC product line transfer) |
W83L951ADG lqfp-128 (pqfp128) ピン配置ガイド
W83L951ADG (lqfp-128 (pqfp128) パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: W83L951ADG.
詳細は データシート をご参照ください。
主な用途
W83L951ADG の用途: 6 件s: Notebook Keyboard Controller, ACPI Power Management Supervision, Legacy Industrial x86 Board Maintenance, Portable Device Keyboard Scanning, System Management Event Handling, Board-Level Repair and Refurbishment.
Notebook Keyboard Controller
The primary application of the W83L951ADG is keyboard matrix scanning and PS/2-style host communication in notebook computers. Its integrated PC/AT-compatible keyboard controller scans matrix rows and columns with hardware debounce, then translates key data for the host chipset over the EC host interface. Because the 8051-compatible core runs the scanning firmware, OEMs could customize layouts and hotkeys. On legacy laptop motherboard repairs, a failed W83L951ADG presents as dead or ghosting keys; replacing it with the same LQFP-128 part restores function without board rework, provided the firmware image in the device matches the platform.
おすすめ
ACPI Power Management Supervision
In x86 mobile platforms, the embedded controller is the always-on silicon that manages ACPI power states, power-button events, lid switches, and battery status reporting while the main CPU sleeps. The W83L951ADG's 8051-compatible core executes this supervision firmware, with its GPIO banks reading thermistors, buttons, and battery-pack signals. Its low-power CMOS process keeps quiescent draw minimal, which matters because the EC runs continuously on battery. Replacement units must carry the OEM firmware image, since ACPI behavior - including S3/S5 sequencing - lives in the controller's program memory, not in host software.
おすすめ
Legacy Industrial x86 Board Maintenance
Industrial PCs and embedded x86 single-board computers from the early-2000s era frequently adopted the same Winbond EC/KBC silicon as consumer laptops for keyboard interface and system management. Maintaining these long-life systems today means sourcing W83L951ADG from aftermarket channels such as Ariat-Tech or Veswin, since the part is obsolete. The LQFP-128 footprint allows direct replacement on the original PCB; technicians should verify date codes, confirm the programmed firmware matches the board revision, and validate keyboard scan behavior across the full matrix before returning the system to service.
おすすめ
Portable Device Keyboard Scanning
Beyond laptops, the W83L951ADG served portable devices - handheld terminals, mobile point-of-sale units, and test equipment - that needed a self-contained keyboard scanning engine with low power draw. The controller's hardware scan of up to a large matrix through its combined KBC and GPIO pins offloads scanning from the host CPU, extending battery life. Its 0.4 mm-pitch LQFP-128 package fits dense portable PCBs. Designs replacing it must replicate the firmware's scan-table behavior; a bare replacement chip without the correct programmed image will not decode the matrix correctly.
おすすめ
System Management Event Handling
The EC also acts as the system's low-level event hub: thermal alerts, fan control requests, battery-low warnings, and power-button presses funnel through its GPIO and interrupt logic to the chipset. The W83L951ADG's timers and interrupt structure support these periodic tasks from the 8051-compatible core without host intervention. In diagnostic scenarios, erratic fan behavior or failure to power on often traces to the EC rather than the main CPU. Because event handling is firmware-defined, board-level replacement must preserve the original firmware to keep power sequencing and event mapping intact.
おすすめ
Board-Level Repair and Refurbishment
Third-party repair shops and refurbishment lines for legacy laptops treat the W83L951ADG as a stocked service part. The rework procedure requires a profile-controlled hot-air or reflow process suited to the 0.4 mm lead pitch of the LQFP-128 package to avoid solder bridging on the fine-pitch lands. Source parts from brokers quoting new-and-original stock (Ariat-Tech listed 1481 pcs), inspect for lead oxidation given storage age, and reprogram or verify firmware before final assembly. Keeping a small buffer stock is wise, as remaining aftermarket supply is finite and unrefreshable.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: W83L951ADG — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | W83L951ADG-A | W83L951ADG (Nuvoton branded) | W83L950ADG | W83L951ADG-T |
|---|---|---|---|---|---|
| Package | LQFP-128 | LQFP-128 - same | LQFP-128 - same | LQFP-128 - same | LQFP-128 - same |
| Brand | Winbond Electronics | Winbond Electronics | Nuvoton Technology | Winbond Electronics | Winbond Electronics |
| Core | 8051-compatible EC core | 8051-compatible EC core | 8051-compatible EC core | 8051-compatible EC core | 8051-compatible EC core |
| Keyboard Controller | Integrated PC/AT-compatible KBC | Yes - identical | Yes - identical | Yes - same family KBC | Yes - identical |
| Process Technology | CMOS | CMOS | CMOS | CMOS | CMOS |
| Lifecycle Status | Obsolete | Obsolete (aftermarket stock) | Obsolete (aftermarket stock) | Obsolete | Obsolete (aftermarket stock) |
| Pin-to-Pin Compatibility | Reference | 100% - same die | 100% - same silicon | Same footprint; verify peripheral set | 100% - same die |
主な差別化要因
- Identical die availability under two brands （vs W83L951ADG (Nuvoton branded))
- Guaranteed pin-to-pin service replacement （vs W83L951ADG-A)
- Integrated KBC reduces external parts （vs W83L950ADG)
設計ノート
The most frequent failure mode with W83L951ADG replacement is firmware mismatch: this EC stores platform-specific keyboard scan tables and ACPI handling in its program memory, so a physically correct but wrongly-programmed chip produces dead keys or failure to power on. Always source programmed-per-OEM parts when available, or dump the original device firmware with a programmer before removing a suspected-failed unit. Verify the replacement's marking and date code against the board revision documentation.
The LQFP-128 package uses a 0.4 mm lead pitch, which demands careful rework practice: use a temperature-profiled hot-air station, flux the lead row fully, and inspect with magnification for solder bridges between adjacent leads after replacement. On the design side, if porting the footprint to a new board, follow the datasheet's recommended land pattern exactly; fan out power and ground pins with adequate via stitching to the planes, since the EC switches its keyboard scan matrix continuously.
Estimated: the W83L951ADG is a low-power CMOS device, but its exact supply voltage range and current draw are not stated in the data available to this page ([DATA_NEEDED: supply voltage range]). Before replacement, measure the rail feeding the EC on the working board and confirm the replacement's operating range from the archived Winbond datasheet. Add 0.1 uF decoupling at each supply pin pair plus a bulk capacitor near the controller as standard practice for 8051-class EC silicon.
コンプライアンス情報
No RoHS/REACH documentation found in the available distributor data for this obsolete part; request manufacturer compliance certificates from stocking brokers, noting old-stock date codes may predate RoHS.
