Overview
The BC857B-HF is a PNP bipolar junction transistor (BJT) manufactured by Comchip Technology. It is designed for general-purpose applications, particularly in audio frequency small signal amplifiers. This transistor is packaged in a SOT-23 (TO-236-3, SC-59, SOT-23-3) case, making it suitable for surface mount technology (SMT) assembly. The BC857B-HF is known for its reliability and performance in a variety of electronic circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Comchip Technology |
| Part Number | BC857B-HF |
| Transistor Type | PNP |
| Package / Case | SOT-23 (TO-236-3, SC-59, SOT-23-3) |
| Mounting Type | Surface Mount |
| Voltage - Collector Emitter Breakdown (Max) | 45V |
| Vce Saturation (Max) @ Ib, Ic | 650mV @ 5mA, 100mA |
| Current - Collector (Ic) (Max) | 100mA |
| Power - Max | 250mW |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Frequency - Transition | 100MHz |
| DC Current Gain (hFE) (Min) @ Ic, Vce | 125 @ 2.2mA, 5V |
Key Features
- High Collector-Emitter Voltage: Up to 45V, making it suitable for a wide range of applications.
- Low Vce Saturation: 650mV at 5mA and 100mA, ensuring efficient operation.
- High DC Current Gain: Minimum hFE of 125 at 2.2mA and 5V, providing reliable amplification.
- Compact Packaging: SOT-23 package for surface mount applications, saving board space.
- Broad Operating Temperature Range: From -65°C to 150°C, suitable for various environmental conditions.
Applications
The BC857B-HF is widely used in general-purpose amplifier circuits, particularly in audio frequency applications. It is also suitable for use in switching circuits, voltage regulation, and other small signal applications. Its compact SOT-23 packaging makes it ideal for modern electronic devices where space is limited.
Q & A
- What is the transistor type of the BC857B-HF?
The BC857B-HF is a PNP bipolar junction transistor. - What is the maximum collector-emitter voltage of the BC857B-HF?
The maximum collector-emitter voltage is 45V. - What is the maximum collector current of the BC857B-HF?
The maximum collector current is 100mA. - What is the package type of the BC857B-HF?
The package type is SOT-23 (TO-236-3, SC-59, SOT-23-3). - What is the operating temperature range of the BC857B-HF?
The operating temperature range is from -65°C to 150°C (TJ). - What is the typical application of the BC857B-HF?
The BC857B-HF is typically used in general-purpose amplifier circuits, especially in audio frequency applications. - What is the maximum power dissipation of the BC857B-HF?
The maximum power dissipation is 250mW. - What is the transition frequency of the BC857B-HF?
The transition frequency is 100MHz. - How is the BC857B-HF mounted?
The BC857B-HF is mounted using surface mount technology (SMT). - What is the minimum DC current gain (hFE) of the BC857B-HF?
The minimum DC current gain (hFE) is 125 at 2.2mA and 5V.
