2N4126 PNP Transistor Technical Summary

Overview

The 2N4126 is a general-purpose PNP bipolar junction transistor (BJT) housed in a TO-92 (SOT54) plastic package. It is designed for low-power amplification and switching applications, offering reliable performance in a compact form factor. The transistor is characterized by its low current and voltage ratings, making it suitable for use in consumer electronics, signal processing, and other low-power circuits.

Features

• Polarity: PNP (Positive-Negative-Positive)
• Package Type: TO-92 (SOT54) plastic package
• Maximum Collector Current (Ic): 200 mA
• Maximum Collector-Emitter Voltage (V_CEO): 25 V
• Low Power Dissipation: Suitable for energy-efficient designs
• Compact and Lightweight: Ideal for space-constrained applications
• Reliable Performance: Stable operation under specified conditions

Applications

The 2N4126 PNP transistor is widely used in various electronic circuits due to its versatility and low-power characteristics. Common applications include:

• Signal Amplification: Used in audio and RF amplification stages.
• Switching Circuits: Functions as a switch in low-power digital and analog circuits.
• Consumer Electronics: Found in remote controls, small appliances, and portable devices.
• Sensor Interfaces: Amplifies weak signals from sensors in industrial and automotive systems.
• Oscillators and Timers: Used in timing circuits and waveform generation.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the 2N4126 PNP transistor under standard operating conditions (unless otherwise specified):

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): 25 V
• Collector-Base Voltage (V_CBO): 30 V
• Emitter-Base Voltage (V_EBO): 5 V
• Collector Current (I_C): 200 mA
• Total Power Dissipation (P_tot): 625 mW (at 25°C)
• Operating Temperature Range (T_j): -55°C to +150°C

Typical Electrical Characteristics

• DC Current Gain (h_FE): 100 - 300 (at I_C = 10 mA, V_CE = 1 V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): ≤ 0.3 V (at I_C = 10 mA, I_B = 1 mA)
• Transition Frequency (f_T): 250 MHz (typical)
• Input Capacitance (C_ib): 6 pF (typical)

Package Information

The 2N4126 is housed in a TO-92 (SOT54) plastic package, which is widely used for small-signal transistors. The package dimensions and pin configuration are as follows:

TO-92 Package Dimensions

• Package Type: TO-92 (SOT54)
• Body Length: 4.95 mm (max)
• Body Width: 3.94 mm (max)
• Body Height: 4.95 mm (max)
• Lead Pitch: 1.27 mm (standard)
• Lead Length: 25.4 mm (standard)

Pin Configuration

• Pin 1 (Emitter): Connected to the emitter region of the transistor.
• Pin 2 (Base): Connected to the base region, controls the transistor's operation.
• Pin 3 (Collector): Connected to the collector region, the main current-carrying terminal.

Thermal Characteristics

The thermal performance of the 2N4126 is critical for ensuring reliable operation. The following parameters define its thermal behavior:

• Thermal Resistance, Junction-to-Ambient (R_θJA): 200°C/W (typical)
• Thermal Resistance, Junction-to-Case (R_θJC): 83.3°C/W (typical)

Reliability and Quality

The 2N4126 is manufactured under strict quality control standards to ensure long-term reliability. It is RoHS compliant, making it suitable for use in environmentally sensitive applications. The device is also designed to withstand mechanical stress and thermal cycling, ensuring durability in harsh operating conditions.

Conclusion

The 2N4126 PNP transistor is a versatile and reliable component for low-power amplification and switching applications. Its compact TO-92 package, combined with robust electrical characteristics, makes it a popular choice among designers. Whether used in consumer electronics, industrial controls, or sensor interfaces, the 2N4126 delivers consistent performance under a wide range of operating conditions.