2N4403 PNP Transistor Technical Summary

Overview

The 2N4403 is a general-purpose PNP bipolar junction transistor (BJT) designed for switching and amplification applications. Housed in a TO-92 (SOT54) plastic package, this transistor is widely used in low-power circuits due to its high current capability and low voltage operation. The 2N4403 is the PNP complement to the popular NPN 2N4401 transistor, making it suitable for push-pull configurations and other complementary designs.

Features

• High Current Capability: Maximum collector current (Ic) of 600 mA
• Low Voltage Operation: Collector-emitter voltage (V_CEO) up to 40 V
• Complementary Pair: PNP counterpart to the 2N4401 NPN transistor
• TO-92 Package: Compact and easy-to-use through-hole package (SOT54)
• Good Gain Characteristics: DC current gain (h_FE) typically 100 to 300
• Low Saturation Voltage: Ensures efficient switching performance

Applications

The 2N4403 is versatile and finds use in a wide range of electronic circuits, including:

• Switching Circuits: On/off control for relays, LEDs, and small motors
• Amplification: Small-signal amplification in audio and RF stages
• Complementary Designs: Used with NPN transistors in push-pull configurations
• Driver Stages: Interface between low-power ICs and higher current loads
• Oscillators and Timers: Part of feedback networks in oscillator circuits
• Power Management: Voltage regulation and power distribution circuits

Electrical Characteristics

The following tables summarize the key electrical specifications of the 2N4403 transistor. All values are typical unless otherwise noted.

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): 40 V
• Collector-Base Voltage (V_CBO): 60 V
• Emitter-Base Voltage (V_EBO): 5 V
• Collector Current (I_C): 600 mA (continuous)
• Total Power Dissipation (P_tot): 625 mW at 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)

• Test Condition: I_C = 10 mA, V_CE = 1 V
• Minimum: 100
• Typical: 150
• Maximum: 300

Saturation Characteristics

• Collector-Emitter Saturation Voltage (V_CE(sat)):
  • 0.25 V (typical) at I_C = 10 mA, I_B = 1 mA
  • 0.5 V (max) at I_C = 150 mA, I_B = 15 mA
• Base-Emitter Saturation Voltage (V_BE(sat)):
  • 0.8 V (typical) at I_C = 150 mA, I_B = 15 mA

Frequency Characteristics

• Transition Frequency (f_T): 200 MHz (typical) at I_C = 10 mA, V_CE = 20 V
• Capacitance (C_obo): 4.5 pF (typical) at V_CB = 10 V, f = 1 MHz

Package Information

The 2N4403 is available in a standard TO-92 (SOT54) plastic package. This through-hole package is widely used for discrete transistors due to its compact size and ease of assembly.

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 Diameter: 0.46 mm (nominal)
• Lead Spacing: 2.54 mm (between leads)
• Weight: Approximately 0.13 grams

Pin Configuration

• Pin 1 (Emitter): Connected to the emitter region of the transistor
• Pin 2 (Base): Control terminal for transistor operation
• Pin 3 (Collector): Main current-carrying terminal

Note: When viewing the flat side of the TO-92 package with leads pointing downward, the pins are ordered left to right as Emitter, Base, Collector.

Thermal Characteristics

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

Proper heat sinking or derating may be required when operating near maximum power dissipation limits.

Reliability and Qualification

The 2N4403 meets or exceeds the following reliability standards:

• JEDEC registered part
• RoHS compliant (lead-free)
• MSL rating: Level 1 (unlimited floor life at <30°C/85% RH)

Recommended Operating Conditions

For optimal performance and reliability, operate the 2N4403 within these conditions:

• Collector Current (I_C): 0 to 600 mA (continuous)
• Collector-Emitter Voltage (V_CE): 0 to 40 V
• Base Current (I_B): Do not exceed I_C/h_FE
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