Slkor BC847B NPN Transistor: 45V 0.1A SOT‑23 General‑Purpose Signal Switching & Amplification Transistor

BC847B is an NPN silicon epitaxial planar transistor in SOT-23 surface-mount package. It delivers moderate current gain for switching and audio amplification circuits. With wide operating temperature range and compact package size, it fits miniaturized electronic products for signal processing. This document summarizes key parameters, core features, application scenarios and engineering recommendations to support component selection and circuit design.

Slkor general-purpose signal switching and amplifying transistor BC847B product image

1. Core Product Parameters

1. Package: SOT-23
2. Collector-Emitter breakdown voltage: 45V
3. Collector-Base breakdown voltage: 50V
4. Emitter-Base breakdown voltage: 6V
5. Continuous collector current: 100mA
6. Peak collector current: 200mA
7. Total power dissipation: 300mW
8. Maximum junction temperature: 150℃
9. Storage temperature range: -65℃ ~ +150℃
10. DC current gain Group B: minimum 200, maximum 450
11. Typical transition frequency: 300MHz

2. Core Product Features

1. SOT-23 surface-mount package saves PCB space and supports automatic SMT assembly.
2. Stable DC current gain of group B for small-signal amplification.
3. Supports both switching mode and audio amplification mode.
4. Corresponding complementary PNP type BC857B is available for push-pull circuit design.
5. High transition frequency to handle medium-high frequency small-signal processing.
6. Low leakage current for good static power consumption performance.

3. Main Application Range

1. Audio signal amplification circuits
2. General-purpose signal switching control circuits
3. Signal conditioning for compact portable electronics
4. General-purpose signal processing units in consumer electronics
5. Push-pull amplifier circuits with complementary PNP transistor

4. Engineering Design Recommendations

1. In practical circuits, continuous operating current shall not exceed 100mA, and peak transient current shall not exceed 200mA to avoid device damage.
2. Power derating is required in circuit design. Actual power dissipation shall stay below the rated 300mW, and further derate under high-temperature conditions.
3. Observe pin assignment: SOT-23 pins are base, emitter and collector. Avoid wrong pin connection during layout and soldering.
4. Multiple gain grades including A/B/C are available. Confirm grade before selection. Group B provides medium gain. Select proper grade according to amplification requirement.
5. For push-pull amplifier circuits, use complementary BC857B for device pairing.
6. Storage temperature ranges from -65℃ to +150℃. Control soldering temperature and duration to prevent thermal damage.

5. Product Summary

BC847B is a general-purpose NPN small-signal transistor in SOT-23 package, with 45V breakdown voltage and 100mA rated current. Group B offers DC current gain from 200 to 450. It works for both switching and audio amplification applications. Its compact form factor supports mass SMT production and complementary PNP counterpart is offered. Widely adopted for small-signal processing in consumer electronics. Proper derating on current and power, correct gain grade selection and correct pin connection are required to guarantee long-term stable circuit performance.

About Slkor：

Slkor has research and development offices in Busan, South Korea, Beijing, China, and Suzhou, China. Most of the wafer manufacturing and packaging and testing are carried out within China. The company employs and collaborates with individuals and organizations worldwide, with a laboratory for product performance and reliability testing and a central warehouse located at its headquarters in Shenzhen. Slkor has filed for over a hundred invention patents, offers more than 2,000 product models, and serves over ten thousand customers globally. Its products are exported to countries and regions including Europe, the Americas, Southeast Asia, and the Middle East, making it one of the rapidly growing semiconductor companies in recent years. With well-established management systems and streamlined workflows, Slkor has rapidly enhanced the brand awareness and reputation of its "SLKOR" brand through its outstanding quality and standardized services. Its product range includes three major series: diodes, transistors, and power devices, with recent introductions of new products such as Hall elements and analog devices, expanding its presence in sensors, Risc-v microcontrollers, and other product categories.

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