Overview
The BC857A-HF is a general-purpose PNP bipolar junction transistor (BJT) manufactured by Comchip Technology. This transistor is part of the BC856-HF through BC858-HF series and is known for its halogen-free and RoHS-compliant design. It is packaged in a SOT-23 case, making it suitable for a wide range of electronic applications where space is limited.
The BC857A-HF is designed to operate with low current and offers a robust set of electrical characteristics, including high collector-base voltage and a wide operating temperature range. This makes it an excellent choice for various general-purpose applications in electronic circuits.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Collector-Base Voltage | VCBO | -50 | V |
| Collector-Emitter Voltage | VCEO | -45 | V |
| Emitter-Base Voltage | VEBO | -5 | V |
| Collector Current - Continuous | IC | -100 | mA |
| Power Dissipation (at TA=25°C) | PCM | 0.25 | W |
| Junction Temperature Range | TJ | -65 to +150 | °C |
| Storage Temperature Range | TSTG | -65 to +150 | °C |
| DC Current Gain (hFE) at VCE=-5V, IC=-2.2mA | hFE | 125 | - |
| Base-Emitter Saturation Voltage at IC=-100mA, IB=-5mA | VBE(sat) | -0.65 | V |
| Collector-Emitter Saturation Voltage at IC=-100mA, IB=-5mA | VCE(sat) | -0.3 | V |
| Package | - | SOT-23 | - |
Key Features
- Halogen-Free and RoHS Compliant: Ensures environmental safety and compliance with regulatory standards.
- Low Current Operation: Maximum collector current of 100 mA, suitable for low-power applications.
- High Collector-Base Voltage: VCBO of -50V, providing robust performance in various circuits.
- Wide Operating Temperature Range: Junction and storage temperature ranges from -65°C to +150°C, making it versatile for different environments.
- Compact SOT-23 Package: Ideal for space-constrained designs and high-density applications.
- Low Power Dissipation: PCM of 0.25W at TA=25°C, reducing heat generation and increasing reliability.
Applications
- General Purpose Amplification: Suitable for various amplification tasks in electronic circuits.
- Switching Circuits: Can be used in switching applications due to its low current and high voltage handling capabilities.
- Audio and Signal Processing: Applicable in audio amplifiers and signal processing circuits where low noise and high fidelity are required.
- Automotive and Industrial Electronics: Robust enough for use in automotive and industrial environments due to its wide temperature range and reliability.
- Consumer Electronics: Used in a variety of consumer electronic devices such as TVs, radios, and other household appliances.
Q & A
- What is the collector-base voltage (VCBO) of the BC857A-HF transistor?
The collector-base voltage (VCBO) of the BC857A-HF transistor is -50V.
- What is the maximum collector current (IC) for the BC857A-HF?
The maximum collector current (IC) for the BC857A-HF is -100 mA.
- What is the power dissipation (PCM) of the BC857A-HF at TA=25°C?
The power dissipation (PCM) of the BC857A-HF at TA=25°C is 0.25W.
- What is the junction temperature range for the BC857A-HF?
The junction temperature range for the BC857A-HF is -65°C to +150°C.
- What package type is the BC857A-HF transistor available in?
The BC857A-HF transistor is available in the SOT-23 package.
- Is the BC857A-HF transistor RoHS compliant?
Yes, the BC857A-HF transistor is RoHS compliant and halogen-free.
- What is the DC current gain (hFE) of the BC857A-HF at VCE=-5V and IC=-2.2mA?
The DC current gain (hFE) of the BC857A-HF at VCE=-5V and IC=-2.2mA is 125.
- What are the typical applications of the BC857A-HF transistor?
The BC857A-HF transistor is typically used in general-purpose amplification, switching circuits, audio and signal processing, automotive and industrial electronics, and consumer electronics.
- What is the base-emitter saturation voltage (VBE(sat)) of the BC857A-HF?
The base-emitter saturation voltage (VBE(sat)) of the BC857A-HF is approximately -0.65V at IC=-100mA and IB=-5mA.
- What is the collector-emitter saturation voltage (VCE(sat)) of the BC857A-HF?
The collector-emitter saturation voltage (VCE(sat)) of the BC857A-HF is approximately -0.3V at IC=-100mA and IB=-5mA.
