BC847BW-7-F - NPN BJT 45V 100mA SOT-323 | Diodes Incorporated
部品番号: BC847BW-7-F ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.038 | $0.04 |
| 10 | $0.03 | $0.30 |
| 100 | $0.018 | $1.80 |
| 500 | $0.013 | $6.50 |
| 1,000 | $0.009 | $9.00 |
BC847BW-7-F 概要
A bipolar junction transistor is a three-terminal semiconductor device that uses both electron and hole charge carriers to amplify or switch electronic signals. BJTs sit at the foundation of the discrete semiconductor hierarchy: transistor -> small-signal BJT -> general-purpose amplifier and switch. The BC847BW belongs to the widely standardized BC847 family, whose pinout and gain groupings (A, B, C grades) are recognized across the entire industry, so designs built around it remain manufacturable for decades.
Key features include automatic-insertion-friendly lead forming, availability of complementary PNP types in the BC856W to BC858W family, lead-free and RoHS-compliant construction with a Green package designation, and the space-saving SOT-323 footprint that occupies roughly half the board area of a SOT-23. The 300 MHz transition frequency gives ample margin for fast logic-level switching and RF-biased analog stages.
Technically, the device uses a planar epitaxial silicon NPN structure. The B gain grade guarantees hFE between 200 and 450 at 2 mA, providing predictable bias behavior in low-current analog stages. The 45 V VCEO rating comfortably covers 24 V industrial rails, 12 V automotive systems, and 5 V or 3.3 V logic domains, while a low collector-emitter saturation voltage supports efficient low-side switching.
Typical applications include general-purpose low-side switching of relays, LEDs, and microcontroller I/O; AF amplifier input and driver stages; and level-shifting or buffer stages in sensor and communication interfaces. Its high gain grade at low collector currents makes it especially economical in battery-powered portable electronics.
For design, remember that 200 mW dissipation in the SOT-323 package is only achievable with adequate PCB copper area; derate above 25 C ambient. Keep base drive current within the datasheet limit and verify hFE grouping when replacing other BC847 grades.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, with verified data as of 2026-10-13.
ドロップイン代替品: BC847BW-7-F — 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:
BC847CW-7-F
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BC846BW-7-F
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BC847AW-7-F
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
BC847BW
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BC817W
✅ ドロップイン📋 参考代替品（カタログ未掲載）
FJX945
✅ ドロップイン📋 参考代替品（カタログ未掲載）
2SC4116
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BC847BW-7-F 最大定格＆電気的特性
| Transistor Polarity | NPN |
| トランジスタタイプ | Bipolar (BJT), Small Signal |
| Collector-Emitter Breakdown Voltage (VCEO) | 45 V |
| Collector Current (IC, Max) | 100 mA |
| Power Dissipation (PD, Max) | 200 mW |
| 遷移周波数（ft） | 300 MHz |
| 直流電流利得（hFE）最小 | 200 at 2 mA, VCE per datasheet |
| Gain Grade | B (hFE 200 to 450) |
| パッケージ | SOT-323 (SC-70), 3-pin |
| 実装タイプ | Surface Mount |
| Complementary PNP Types | BC856W to BC858W |
| Lead Free / RoHS | Compliant (Green) |
| 特長 | Ideally suited for automatic insertion; switching and AF amplifier applications |
BC847BW-7-F ピン構成
| ピン 1 | Base — Base terminal (control input) |
| ピン 2 | Emitter — Emitter terminal |
| ピン 3 | Collector — Collector terminal (main current path) |
主な用途
BC847BW-7-F の用途: 6 件s: Low-Side Switching, Audio Frequency Amplifier Stages, Microcontroller I/O Level Shifting and Buffering, Sensor and Signal-Chain Analog Biasing, Consumer Electronics and Portable Devices, Automotive and Industrial 12V/24V Rail Interface.
Low-Side Switching
The BC847BW-7-F is ideally suited for switching applications per its datasheet, and its role as a low-side switch is the most common use in embedded designs. With a 45 V VCEO and 100 mA collector rating, it directly drives relays, indicator LEDs, small buzzers, and pull-down loads from 5 V or 12 V rails. The B gain grade (hFE at least 200 at 2 mA) means a microcontroller GPIO can saturate the transistor with only a few mA of base current through a typical 4.7 kOhm resistor, protecting the MCU pin. The 300 MHz transition frequency keeps switching edges fast enough for PWM dimming and logic-level level-shifting. Designers should size the base resistor for the target collector current and confirm saturation voltage from the datasheet curves.
おすすめ
Audio Frequency Amplifier Stages
The Diodes Incorporated datasheet explicitly lists the BC847BW-7-F for audio frequency (AF) amplifier applications. In class-A preamp and driver stages, the B gain grade (hFE 200 to 450 at 2 mA) provides high current gain at the small collector currents typical of audio signal paths, yielding high input impedance that lightly loads microphones, pickups, and DAC outputs. At collector currents in the 1 mA to 5 mA range, the device operates in its low-noise region, suitable for first-stage amplification. The availability of complementary PNP types in the BC856W to BC858W family allows matched push-pull output and current-mirror biasing in compact SOT-323 layouts, and the 300 MHz fT gives flat response well beyond the audio band.
おすすめ
Microcontroller I/O Level Shifting and Buffering
The BC847BW-7-F serves as an inexpensive discrete level shifter and buffer between microcontrollers and higher-voltage peripherals. Its 45 V VCEO tolerates 24 V industrial logic domains, while its small SOT-323 footprint allows placement directly at connector or header locations. In open-collector configurations for I2C, one-wire, or status signaling, the 100 mA rating is far above bus requirements, and the guaranteed hFE of at least 200 ensures the GPIO does not need to source significant current. For designs converting 3.3 V or 5 V GPIO signals to 12 V or 24 V sensor excitation, the transistor plus two resistors remains the cheapest, most robust solution, and the surface-mount package supports automated assembly for high-volume boards.
おすすめ
Sensor and Signal-Chain Analog Biasing
In analog signal chains, the BC847BW-7-F is used as a bias current source, active load, or emitter follower feeding ADC inputs and sensor excitation circuits. The stable B gain grade (hFE 200 to 450) supports predictable bias-point calculations without extra trimming, and its low base current at moderate hFE minimizes loading error in high-impedance nodes such as photodiode or thermistor dividers. With a 45 V rating, it can also implement cascode stages for op-amp rails up to 24 V. Because the device transitions at 300 MHz, it introduces negligible phase shift at audio and low-RF frequencies, keeping the signal chain transparent. Pair with precision references and low-noise op-amps for measurement front ends.
おすすめ
Consumer Electronics and Portable Devices
The BC847BW-7-F's Green, lead-free, RoHS-compliant SOT-323 package and automatic-insertion-friendly design make it a volume workhorse in consumer electronics: remote controls, chargers, small appliances, toys, and battery-powered portables. At typical small-signal currents of a few mA, its dissipation stays far below the 200 mW limit, so no thermal design effort is required, and the tiny SC-70 footprint conserves board area in dense layouts. The industry-standard BC847W gain grading and pinout give procurement teams a deep, multi-source supply pool (Diodes, Infineon, Nexperia, onsemi equivalents), reducing single-source risk for high-volume production. Complementary BC856W-family PNPs keep BOMs symmetrical for H-bridge-like discrete drive circuits.
おすすめ
Automotive and Industrial 12V/24V Rail Interface
With a 45 V collector-emitter rating, the BC847BW-7-F comfortably interfaces 12 V automotive loads and 24 V industrial control signals with headroom for transients within its absolute ratings. Typical uses include driving status LEDs from 24 V PLC I/O, gating small relays and solenoids (with flyback diodes), and level-shifting sensor outputs to controller logic. Note this part is not AEC-Q100 qualified; for automotive production, select a qualified equivalent. In industrial settings, the 100 mA current limit suits signaling loads rather than actuators, and designers should include series base resistors sized for the controller drive capability. The SOT-323 package simplifies dense I/O cards where hundreds of channels share a PCB.
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: BC847BW-7-F — 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 | BC847CW-7-F | BC846BW-7-F | BC847BW | FJX945 |
|---|---|---|---|---|---|
| Package | SOT-323 (SC-70) | SOT-323 - same | SOT-323 - same | SOT-323 - same | SOT-323 - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Infineon | onsemi |
| RoHS / Lead Free | Compliant (Green) | Compliant (-F suffix) | Compliant (-F suffix) | Compliant | Compliant |
主な差別化要因
- Space-saving SOT-323 footprint （vs BC847ALT1 (SOT-23))
- High B gain grade at low current （vs BC847AW-7-F)
- Green lead-free construction （vs BC847CW-7-F)
設計ノート
The 200 mW power dissipation rating for the SOT-323 package applies at approximately 25 C ambient with a standard footprint. Estimated: at 100 mA collector current and 1 V of VCE(sat) plus bias overhead, dissipation reaches roughly 100 mW, consuming half the budget; in enclosed products above 50 C ambient, derate linearly and target under 80 mW steady-state. For relay or LED loads near the 100 mA limit, verify junction temperature using the package thermal resistance from the datasheet and allow copper pour on the collector pin to spread heat.
Verify the hFE gain grade when cross-referencing: the BC847 family ships in A, B, and C gain grades (B = 200-450 at 2 mA for this part). Substituting a C-grade part into a bias-critical analog stage shifts the operating point, and an A-grade part may not saturate with your chosen base drive. Also, never rely on the BC847BW-7-F for inductive loads without a flyback diode: inductive kick can exceed the 45 V VCEO instantly. Base resistors should limit base current to a value the driving GPIO can source while still achieving forced-beta saturation.
Place the BC847BW-7-F close to its load and driver to minimize loop area, especially in switching roles where fast 300 MHz-class edges can radiate. The SOT-323 land pattern is industry-standard for the SC-70 family; using this standard footprint keeps all drop-in alternatives (BC847CW-7-F, BC846BW-7-F, Infineon BC847BW) solderable without PCB rework. Keep the base trace short and away from high-current collector paths to avoid unintended coupling in amplifier stages.
コンプライアンス情報
Per Diodes Incorporated datasheet: Lead Free/RoHS Compliant (Note 3) and Green package designation. REACH and conflict minerals status not stated in provided data.
