2N4920 Silicon Epitaxial Planar PNP Transistor

Overview

The 2N4920 is a silicon epitaxial planar PNP transistor designed for general-purpose amplification and switching applications. This robust component is characterized by its high current capability, low saturation voltage, and reliable performance in a variety of electronic circuits. The transistor is housed in a TO-39 metal can package, providing excellent thermal conductivity and mechanical durability.

Engineered for versatility, the 2N4920 is suitable for use in both industrial and consumer electronics, offering stable operation across a wide temperature range. Its epitaxial planar construction ensures consistent performance and low leakage currents, making it a dependable choice for designers seeking a cost-effective PNP transistor solution.

Features

• High Current Capability: Capable of handling collector currents up to 1A, making it suitable for power amplification and switching tasks.
• Low Saturation Voltage: Features a collector-emitter saturation voltage (V_CE(sat)) as low as 0.5V, enhancing efficiency in switching applications.
• Epitaxial Planar Construction: Ensures high reliability, low noise, and excellent gain characteristics.
• Wide Operating Temperature Range: Operates reliably from -65°C to +200°C, accommodating harsh environmental conditions.
• TO-39 Package: Robust metal can packaging provides superior thermal dissipation and mechanical strength.
• Complementary NPN Option: Pairs well with NPN transistors like the 2N4919 for push-pull configurations.

Applications

The 2N4920 is widely used in various electronic circuits due to its versatile performance characteristics. Key applications include:

• General-Purpose Amplification: Used in audio amplifiers, signal processing circuits, and small-signal amplification stages.
• Switching Circuits: Suitable for relay drivers, motor control, and power switching due to its low saturation voltage.
• Voltage Regulation: Employed in linear voltage regulators and power supply control circuits.
• Industrial Controls: Found in automation systems, sensor interfaces, and control modules.
• Consumer Electronics: Used in televisions, radios, and other household electronic devices.

Electrical Characteristics

The following tables outline the key electrical specifications of the 2N4920 transistor under standard test conditions (unless otherwise specified).

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): -40V
• Collector-Base Voltage (V_CBO): -60V
• Emitter-Base Voltage (V_EBO): -5V
• Collector Current (I_C): -1A
• Total Power Dissipation (P_D): 1W at 25°C (derate linearly above 25°C)
• Operating and Storage Temperature Range: -65°C to +200°C

DC Current Gain (h_FE)

• Minimum h_FE at I_C = -150mA, V_CE = -1V: 40
• Typical h_FE at I_C = -150mA, V_CE = -1V: 100
• Maximum h_FE at I_C = -150mA, V_CE = -1V: 300

Small-Signal Characteristics

• Transition Frequency (f_T): 50MHz (typical) at I_C = -10mA, V_CE = -5V
• Input Capacitance (C_ibo): 15pF (typical) at V_CB = -10V, I_E = 0
• Output Capacitance (C_obo): 5pF (typical) at V_CE = -10V, I_E = 0

Package Information

The 2N4920 is available in a TO-39 metal can package, which provides excellent thermal and electrical performance. Below are the key mechanical specifications:

TO-39 Package Dimensions

• Case Material: Metal (typically steel or alloy)
• Lead Material: Copper alloy, tin-plated
• Diameter: 8.13mm (0.320 inches) max
• Height: 5.59mm (0.220 inches) max
• Lead Spacing: 2.54mm (0.100 inches) between leads
• Weight: Approximately 1.2 grams

Thermal Characteristics

• Thermal Resistance, Junction-to-Ambient (R_θJA): 175°C/W (typical)
• Thermal Resistance, Junction-to-Case (R_θJC): 83.3°C/W (typical)

Conclusion

The 2N4920 is a reliable and versatile PNP transistor that excels in general-purpose amplification and switching applications. Its high current capability, low saturation voltage, and robust TO-39 package make it an excellent choice for engineers and hobbyists alike. Whether used in industrial control systems, consumer electronics, or power regulation circuits, the 2N4920 delivers consistent performance across a broad range of operating conditions.

For optimal results, designers should ensure proper heat dissipation and adhere to the specified maximum ratings to maintain long-term reliability. Complementary pairing with NPN transistors like the 2N4919 can further enhance circuit performance in push-pull configurations.