2n4403 transistor

2n4403 transistor
2n4403 transistor

2n4403 is a general-purpose PNP bipolar transistor mainly used for low power applications, the terminal voltage, and current values show that 2m4403 is a lighter power device.

Electrical specification of 2n4403 transistor 

  • 2n4403 is a general-purpose low power PNP BJT transistor
  • Collector to base voltage (VCB) is -40V
  • Collector to emitter voltage (VCE) is -40V
  • Emitter to base voltage (VEB) is -5V
  • Collector to emitter saturation voltage (VCE (sat)) is -0.4V
  • Collector current (IC) is -600mA
  • Power dissipation (PD) is 625mW
  • Junction Temperature (TJ) is -65 to +150°C
  • DC gain is 20 to 300hFE
  • Transition frequency (FT) is 200MHz
  • Small signal DC current gain is 60 to 500hFE


  1. emitter
  2. base
  3. collector

The PINOUT configuration pattern of the 2n4403 transistor is EBC, this is a general pattern used at low power and general-purpose transistors.

The package used for this transistor is TO-92, we know this is the main transistor package used on general-purpose transistors.

SMD version transistor of 2n4403

The 2n4403 transistor had multiple SMD versions, such as 2sa1518, bc807, pmst4403, and mmst4403.

Each one of the transistors on the above list is the SMD version of the 2n4403 transistor and also the electrical specifications of each transistor are the same as 2n4403. The power dissipation and max temperature are different.

SMD version transistor package

S2SA1518 and BC807 SMD transistors have (SOT-23) package

PMST4403 and MMST4403 SMD transistors have (SOT-323) package

Electrical characteristics & application description of 2n4403 transistor

Voltage characteristic

Collector to emitter voltage and collector to base voltage is the same 40v, this shows it is a low power transistor and collector to emitter saturation voltage is 0.4v, this saturation voltage value the switching ability of 2n4403 transistor.

Current characteristics

The collector current at the 2n4403 transistor is 600mA, the current value indicates the max load allowable on the transistor. 

DC current gain

The DC current gain of the 2n4403 transistor is 20 to 300hFE, the gain is the amplification ability of a transistor.

The small-signal gain value of 2n4403 transistor is 60 to 500Hfe.

Transition frequency

The transition frequency of the 2n4403 transistor is 200MHz, this shows the maximum operating speed of the transistor.

Power losses

Power dissipation of 625mW and junction temperature value of -55 to +150°C, the dissipation value shows that the 2n4403 transistor is a low power device and the max temperature value is best for a general-purpose transistor.

Uses of 2n4403 transistor

  • LOW power switching circuit
  • Preamp circuit
  • Lighting circuits
  • Relay driver
  • Small signal amplifier

Equivalent transistors for 2n4403

The transistors such as 2SA708, BC527, KSA708, MPS750, PN2907A, and ZTX550 are the equivalent transistors for 2N4403.

The transistors on this list had almost the same electrical and physical specifications, but we need to check and verify the pieces of information before the replacement process.

Complementary transistors of 2n4403

The 2n4400 and 2n4401 are the NPN complementary transistors for 2n4403, the electrical specifications of both transistors had the same as 2n4403.

Due to this reason, we can use the NPN-PNP pair as Darlington pair at push-pull amplifier circuits.

2n4403 vs 2n3906

Characteristics     2n4403     2n3906
Collector to base voltage (VCB) -40V -40V
Collector to emitter voltage (VCE) -40V -40V
Emitter to base voltage (VEB) -5V -5V
Collector current (IC) -600mA -200mA
Power dissipation 625mW 625mW
Junction temperature (TJ) -55 to +150°C -55 to 150°C
Transition frequency (FT) 200MHz 250MHz
     Noise (N)
   Gain (hFE) 60 to 500hFE 30 to 300hFE
    Package TO-92 TO-92

The 2n4403 and 2n3906 transistors had almost the same electrical specifications as the table above, but the exceptions are at collector current, transition frequency, and DC current gain.

Characteristics curves of 2n4403 transistor

DC current gain
DC current gain

The figure shows the DC current gain vs collector current characteristics curve, from the graph we can see at higher temperature value the gain value and current value is increased and after a point, the gain value decreases.

collector to emitter voltage

The figure shows the collector to emitter voltage vs base current graph, indicating the collector saturation curve.

The curves show, at different collector current values the base current and collector to emitter voltage values are at normal level, but a 500mA a the collector to emitter voltage and base current varies drastically.

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