BAV99W - Dual Series Switching Diode 70V SOT-323 | Nexperia
部品番号: BAV99W ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.03 | $0.03 |
| 10 | $0.02 | $0.20 |
| 100 | $0.0134 | $1.34 |
| 500 | $0.011 | $5.50 |
| 1,000 | $0.009 | $9.00 |
BAV99W 概要
A switching diode is a small-signal diode optimized for fast transitions between conducting and non-conducting states rather than for power rectification. Within the component hierarchy, it belongs to the discrete semiconductor -> diode -> small-signal switching diode -> diode array category. Diode arrays such as the BAV99W integrate two or more diodes in one package to save board space and guarantee matched electrical characteristics in clamping, steering, and logic applications.
Key features include the very small SOT323/SC-70 SMD footprint (approximately 60% smaller than the SOT-23 BAV99), a high switching speed of max. 4 ns for high-frequency signal handling, planar epitaxial silicon technology for low leakage and stable parameters, and a series pair configuration ideal for double-clamping and reverse-polarity networks.
The planar technology used in the BAV99W delivers low junction capacitance and low reverse recovery behavior, allowing operation in logic-level and RF-adjacent switching tasks. The series connection of the two diodes inside the 3-lead package gives designers a clamping pair sharing a common node without routing two discrete parts.
Typical applications include high-speed logic clamping and board protection, signal demodulation and detection circuits, reverse-polarity protection of sensor or communication lines, and general-purpose switching in consumer, industrial, and automotive-adjacent electronics.
When laying out the PCB, keep traces to the common series node short to minimize parasitic inductance, and observe the derating curve above 25 C ambient per the manufacturer datasheet.
This page synthesizes distributor pricing, cross-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: BAV99W — 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:
BAV99W-7-F
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BAV99WQ-7-F
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BAV99WT1G
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BAV99W
✅ ドロップイン✓ 在庫あり
$0.009 / 個
データシートを見る →BAV99W
✅ ドロップイン✓ 在庫あり
$0.009 / 個
データシートを見る →BAV99W 最大定格＆電気的特性
| Diode Configuration | 2 diodes in series (1 pair, series connection) |
| Switching Speed | max. 4 ns |
| Technology | Planar silicon |
| パッケージ | SOT323 (SC-70), SMD |
| 実装タイプ | Surface Mount |
| MSLレベル | MSL 1 |
| RoHS ステータス | RoHS3 Compliant |
| REACH Status | REACH Unaffected |
| Lead Free | Yes |
| ハロゲンフリー | Yes (Diodes Inc BAV99W variant: Halogen and Antimony Free, Green Device) |
BAV99W ピン構成
| ピン 1 | A1 — Anode of diode 1 |
| ピン 2 | COM — Common node: cathode of diode 1 connected to anode of diode 2 |
| ピン 3 | K2 — Cathode of diode 2 |
主な用途
BAV99W の用途: 6 件s: High-Speed Logic Clamping and Board Protection, Signal Demodulation and Detection, Reverse Polarity and Line Protection, Automotive Control Modules, Consumer Electronics and IoT Devices, Test and Measurement Instrumentation.
High-Speed Logic Clamping and Board Protection
The BAV99W is a staple for clamping logic and data lines. Its two internal diodes in series share a common node, letting one package clamp a line to two supply rails with 4 ns class switching speed - fast enough for modern digital edge rates. Planar silicon construction keeps leakage low so it does not load high-impedance nets, and the 70 V reverse rating comfortably covers 5 V, 12 V, and 24 V industrial rails with margin. Because the SOT-323 footprint is about 60% smaller than the SOT-23 BAV99, protection networks fit directly under dense connectors or at IC pins without consuming separate routing channels. Designers should keep the trace from pin 2 to the protected net under a few millimeters to preserve clamping effectiveness against fast transients.
おすすめ
Signal Demodulation and Detection
In RF-adjacent and IF detection circuits, the BAV99W's fast 4 ns switching speed and low junction capacitance from planar technology make it effective for envelope detection and signal demodulation at moderate frequencies. The series pair configuration supports voltage-doubler detection topologies using a single package, guaranteeing matched diode characteristics that discrete diodes cannot. Its low forward voltage at small signal currents minimizes the detection threshold, improving sensitivity of AM/ASK demodulators in receiver chains. Because it is a small-signal diode, it should be limited to low-power detection paths - forward current of 150-200 mA class and modest dissipation. The SOT-323 package keeps parasitic inductance low, which matters in compact RF front-end layouts where every millimeter of trace length adds stray reactance.
おすすめ
Reverse Polarity and Line Protection
The BAV99W protects sensor lines, communication buses, and low-power power inputs against reverse polarity and inductive kickback. Its 70 V reverse voltage rating gives generous headroom above 24 V industrial supplies, and the 4 ns switching recovery clips fast transients that slower rectifiers would pass. Placing one diode of the series pair across a coil or motor driver node and the other on the supply input lets a single SOT-323 package handle two protection functions, saving BOM line items and board space. Diotec's variant is rated for 150 C junction temperature, providing derating margin in hot enclosures. For sustained fault currents above a few hundred milliamps, pair the BAV99W with a series PTC or fuse so the diode conducts only transient energy rather than continuous fault current.
おすすめ
Automotive Control Modules
For automotive ECUs and body-electronics modules, the Diodes Incorporated BAV99WQ variant is explicitly AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities, per the manufacturer's product page. It retains the same SOT-323 pinout and 75 V/150 mA ratings, so designs can be qualified without footprint changes. Typical automotive uses include clamping sensor and LIN bus lines, steering logic-level signals around switches, and providing reverse-battery awareness in low-power paths. The very small SC-70 footprint suits high-density body-control modules where connector area dominates the board. Designers must respect the temperature derating of the small package near engine-bay ambient temperatures and verify surge energy against the datasheet ratings rather than assuming rectifier-class robustness.
おすすめ
Consumer Electronics and IoT Devices
In battery-powered consumer and IoT hardware, the BAV99W handles wake-up signal steering, button debounce clamping, and power-path isolation where every square millimeter and every microamp count. Its MSL 1 floor-life rating simplifies assembly logistics, and RoHS3 compliance with REACH unaffected status clears regulatory review for global markets. The SOT-323 footprint fits the tight spacing around buttons, headers, and battery connectors typical of wearables and smart-home devices. Because the diode array integrates two diodes in one package, designers reduce placement cost compared to two discrete SOD-323 parts. Low reverse leakage in the planar process keeps standby drain negligible, which matters directly for battery-life targets in always-on sensing applications.
おすすめ
Test and Measurement Instrumentation
Instrument input stages use the BAV99W as input-overvoltage clamping before precision attenuators and amplifiers. The 4 ns switching speed ensures the clamps engage before fast edges propagate to sensitive front-end ICs, and the low planar-junction leakage avoids corrupting high-impedance measurement paths - a critical property when input bias currents are measured in picoamps. The dual series topology protects both the input node and an internal reference rail from a single package. DigiKey and Mouser stock multiple manufacturer variants of BAV99W, easing qualification of second sources for long-production-life instruments. Designers should place the clamp directly at the input connector with a series resistor ahead of the diodes to limit fault current within the 150-200 mA class forward rating.
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: BAV99W — 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 | BAV99W-7-F | BAV99WT1G | BAV99W (Diotec) | BAV99W (Infineon) |
|---|---|---|---|---|---|
| Package | SOT-323 (SC-70) | SOT-323 (SC-70) - same | SOT-323 (SC-70) - same | SOT-323 (SC-70) - same | SOT-323 (SC-70) - same |
| Brand | Nexperia | Diodes Incorporated | onsemi | Diotec Semiconductor | Infineon |
| Diode Configuration | 2 diodes, series connection | 2 diodes, series connection | 2 diodes, series connection | 2 diodes, series connection | 2 diodes, series connection |
| RoHS Compliance | RoHS3 compliant | RoHS compliant, Green device | RoHS compliant | RoHS compliant | RoHS compliant |
主な差別化要因
- Smaller footprint than SOT-23 equivalents （vs MMBD1503)
- Automotive-qualified variant available （vs BAV99W (Diotec))
- 4 ns class switching speed （vs BAV99W-7-F)
設計ノート
Place the BAV99W as close as possible to the connector or IC pin being protected. The 4 ns switching capability is only effective if parasitic trace inductance is low - a 10 mm trace can add several nanohenries and let fast transients overshoot the clamp before the diode responds. Route pin 2 (the series common node) directly to the protected net with a short, wide trace, and reference the clamp return to a clean, low-impedance ground or rail node.
Do not confuse SOT-323 (BAV99W) with SOT-23 (BAV99) footprints - the 1.2 mm vs 1.9 mm pin pitch means they are physically incompatible despite identical diode internals. Also verify current handling: this is a small-signal diode rated in the 150-200 mA class depending on manufacturer. For sustained fault currents, add a series resistor or fuse so the BAV99W conducts only transient energy. Finally, cross-check the reverse voltage rating of your chosen vendor variant (70 V Diotec vs 75 V Diodes Inc) against your circuit's worst-case transient.
Estimated: the SOT-323 package dissipates only a few hundred milliwatts at most (verify exact Ptot in the manufacturer datasheet). At a typical clamping duty of 100 mA forward current and about 1 V forward voltage, dissipation is roughly 100 mW per diode during conduction events. Ensure copper pours on both pins aid heat spreading, and derate continuously above 25 C ambient per the datasheet derating curve - Diotec's variant specifies a 150 C maximum junction temperature.
コンプライアンス情報
PartGenie: RoHS3 Compliant, REACH Unaffected, MSL Level 1. Diodes Inc variant: Totally Lead-Free, Halogen and Antimony Free, Green Device. AEC-Q101 applies only to the BAV99WQ variant (Diodes Inc), not the standard part.
