BC847BS Basics
The BC847BS is an NPN general-purpose transistor pair housed in a compact SOT363 (SC-88) surface-mounted device (SMD) plastic package. It is typically used in low-power amplification and switching circuits, offering reliable performance in a variety of signal processing tasks.
The BC847BS is great for compact electronic designs due to its small form factor, so it is suitable for use in mobile devices, portable electronics, and other space-constrained applications. Its complementary PNP transistor counterpart, the BC857BS, allows for balanced circuit designs and flexibility in both positive and negative voltage configurations.
BC847BS Symbol
BC847BS Footprint
BC847BS 3D Model
BC847BS Pin Connections
Emitter (TR1): The emitter of the first NPN transistor (TR1), which is the current output terminal for TR1.
Base (TR1): The base of the first NPN transistor (TR1), which controls the current flow between the collector and emitter of TR1.
Collector (TR2): The collector of the second NPN transistor (TR2), where current enters when TR2 is conducting.
Emitter (TR2): The emitter of the second NPN transistor (TR2), where current exits from TR2 when it is conducting.
Base (TR2): The base of the second NPN transistor (TR2), which controls the current flow between the collector and emitter of TR2.
Collector (TR1): The collector of the first NPN transistor (TR1), where current enters when TR1 is conducting.
BC847BS Specification
| Parameter | Value |
| Type | NPN Transistor |
| Package Type | SC-88 |
| Voltage - Collector Emitter Breakdown | 45V |
| Current - Collector Cutoff | 15nA (ICBO) |
| Collector Current (Ic) | 100mA |
| Base Current (Ib) | 5mA |
| Power | 210mW |
| Vce Saturation (Max) @ Ib, Ic | 650mV @ 5mA, 100mA |
| Transition Frequency (fT) | 250MHz |
| Operating Temperature | -55°C ~ 150°C |
| Lead Soldering Temperature | 260°C for 10 seconds |
| Thermal Resistance | 250°C/W (junction to ambient) |
BC847BS Features
Low collector capacitance
Low collector-emitter saturation voltage
Closely matched current gain
Reduces number of components and board space
No mutual interference between the transistors
BC847BS Applications
General-purpose switching and amplification
Logic Circuits
Oscillator Circuits
LED Driving
Current Mirror Circuits
Consumer Electronics
BC847BS Package Outline
The BC847BS is housed in a compact SC-88 (SOT-363) surface-mount package, making it ideal for space-constrained applications. This small footprint enhances PCB design flexibility while ensuring reliable performance in amplification and switching circuits.
BC847BS Soldering
BC847BS Alternatives
Alternatives to the BC847BS include the BC847B, BC847BW, and BC846BS, which offer similar electrical characteristics. For a PNP complementary pair, the BC857BS is a suitable option.
How to Test BC847BS?
To test the BC847BS transistor pair, set a multimeter to diode mode and check the junctions between the base, collector, and emitter of both transistors (TR1 and TR2). For TR1, place the red probe on the base (Pin 2) and the black probe on the emitter (Pin 1); a reading around 0.6V–0.7V indicates a good junction.
Then, keep the red probe on the base and move the black probe to the collector (Pin 6)—another 0.6V–0.7V confirms normal operation. Reverse the probes, and no conduction should be observed. Repeat the same steps for TR2 using Pin 5 as the base, Pin 4 as the emitter, and Pin 3 as the collector.
If both junctions show expected values and no shorts (0V reading in both directions) or open circuits (no readings at all), the transistor is in good condition. If there’s an unexpected reading, such as conduction in reverse or a zero reading both ways, the transistor may be faulty.
FAQs
What type of transistor is the BC847BS?
BC847BS is an NPN/NPN general-purpose transistor pair housed in a compact SOT-363 (SC-88) surface-mount package.
What is the difference between BC847BS and BC857BS?
BC847BS is an NPN dual transistor, while BC857BS is its PNP complementary counterpart.
How do I test BC847BS?
Using a multimeter in diode mode, check the base-emitter and base-collector junctions for a 0.6V–0.7V forward voltage drop while ensuring no conduction in reverse.
