BC848 NPN Transistor Technical Summary

Overview

The BC848 is a general-purpose NPN bipolar junction transistor (BJT) housed in an SC-75 plastic package. Designed for low-power amplification and switching applications, this transistor offers reliable performance in a compact form factor. Its low current and voltage characteristics make it suitable for a wide range of electronic circuits, particularly in consumer electronics, industrial controls, and communication devices.

Features

• Low Current Operation: Maximum collector current (Ic) of 100 mA, making it ideal for low-power applications.
• Low Voltage Rating: Maximum collector-emitter voltage (V_CEO) of 65 V, suitable for low-voltage circuits.
• Compact Package: SC-75 (SOT-416) surface-mount package, enabling high-density PCB designs.
• High Current Gain: Typical DC current gain (h_FE) ranges from 110 to 800, ensuring efficient signal amplification.
• Low Noise: Optimized for low-noise amplification in audio and RF applications.
• Fast Switching Speed: Suitable for high-frequency switching applications.

Applications

The BC848 transistor is widely used in various electronic circuits due to its versatile characteristics. Key applications include:

• Signal Amplification: Used in audio preamplifiers, RF stages, and sensor interfaces.
• Switching Circuits: Ideal for driving relays, LEDs, and other low-power loads.
• Consumer Electronics: Found in remote controls, portable devices, and small appliances.
• Industrial Controls: Used in automation systems, timers, and logic circuits.
• Communication Devices: Employed in radio transceivers and signal processing modules.

Electrical Characteristics

The following tables outline the key electrical specifications of the BC848 transistor under standard test conditions (unless otherwise specified).

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): 65 V
• Collector-Base Voltage (V_CBO): 80 V
• Emitter-Base Voltage (V_EBO): 6 V
• Collector Current (I_C): 100 mA
• Total Power Dissipation (P_tot): 250 mW (at T_amb ≤ 25°C)
• Operating Junction Temperature (T_j): -55°C to +150°C
• Storage Temperature (T_stg): -55°C to +150°C

DC Current Gain (h_FE)

• BC848A: 110 - 220
• BC848B: 200 - 450
• BC848C: 420 - 800

Small-Signal Characteristics

• Transition Frequency (f_T): 100 MHz (typical)
• Collector-Emitter Saturation Voltage (V_CE(sat)): 0.6 V (max) at I_C = 10 mA, I_B = 1 mA
• Base-Emitter Saturation Voltage (V_BE(sat)): 1.2 V (max) at I_C = 10 mA, I_B = 1 mA

Package Information

The BC848 is available in an SC-75 (SOT-416) surface-mount package, which is designed for space-constrained applications. Below are the key mechanical specifications:

SC-75 (SOT-416) Package Dimensions

• Package Length: 1.6 mm (max)
• Package Width: 1.2 mm (max)
• Package Height: 0.6 mm (max)
• Lead Pitch: 0.95 mm (typical)

Marking and Pin Configuration

• Device Marking: The package is marked with a code (e.g., "1A" for BC848A) for identification.
• Pinout:
  • Pin 1: Emitter (E)
  • Pin 2: Base (B)
  • Pin 3: Collector (C)

Thermal Characteristics

Proper thermal management is essential for reliable operation. The following thermal parameters are specified:

• Thermal Resistance, Junction-to-Ambient (R_thJA): 500 K/W (typical)
• Thermal Resistance, Junction-to-Lead (R_thJL): 300 K/W (typical)

Reliability and Compliance

The BC848 transistor complies with industry standards for quality and reliability, including:

• RoHS compliance (Restriction of Hazardous Substances).
• IEC and JEDEC standards for semiconductor devices.

Conclusion

The BC848 NPN transistor is a versatile and reliable component for low-power amplification and switching applications. Its compact SC-75 package, combined with excellent electrical characteristics, makes it a preferred choice for modern electronic designs. Whether used in consumer electronics, industrial systems, or communication devices, the BC848 delivers consistent performance and efficiency.