Darlington Pairs

Darlington pairs, also known as Darlington Transistors are discrete semiconductor devices consisting of a package of two standard BJT transistors (bipolar junction transistor). One of the transistors is high-gain while the other is high current. RS Components offer a wide range of high-quality Darlington Transistors from leading brands including ON Semiconductor, STMicroelectronics, Texas Instruments and Nexperia.

How do they work?

The emitter of one transistor is connected to the base of the other transistor which effectively creates one transistor. They are used to amplify weak signals from one circuit to another circuit or microprocessor. This means that the tiny current from a sensor or microcontroller I/O pin can be amplified to drive a large load. Darlington pairs can also be operated as an ON/OFF switch. Darlington pairs work together as a single transistor but feature a much higher current gain. They also offer high input impedance in comparison to single transistors.

Why should you use a Darlington pair?

Darlington pairs provide a very high current gain. Working as two transistors within one package, Darlington pairs have a very compact footprint which takes up minimal space on a (PCB) printed circuit board.

What applications would you use them in?

With high current gain, Darlington transistors are well suited to power applications such as driving motors and relays. Darlington pairs are ideal for application in display drivers, audio outputs, power regulators, light sensors, touch sensors and power supply outputs. It is not recommended to use them in applications that require high frequency as it is not possible to shut the base current off immediately.

What are the different types?

  • Darlington pairs can consist of either NPN (negative-positive-negative) transistors, PNP (positive-negative-positive) transistors or both.
  • Darlington pairs are typically supplied in one of two ways. You can purchase them as an array (called a Darlington array) within a single integrated circuit (IC) package, or as a simple single discrete component.

Standard package type examples include SOT-23, SOIC, TO-220 and TO-252 (DPAK)


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RS Stock No. 168-6833
Mfr. Part No.ULN2803A
MYR4.683
Each (In a Tube of 20)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 714-1167
Mfr. Part No.ULN2803A
MYR5.47
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 486-0294
Mfr. Part No.TIP142
MYR9.236
Each (In a Pack of 5)
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 102-4091
Mfr. Part No.TIP142
MYR7.004
Each (In a Tube of 30)
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
MYR2.117
Each (In a Tube of 25)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 686-8209
Mfr. Part No.ULN2003A
MYR2.09
Each (In a Pack of 20)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 485-9660
Mfr. Part No.TIP121
MYR2.668
Each (In a Pack of 5)
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NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 102-4100
Mfr. Part No.TIP121
MYR2.142
Each (In a Tube of 50)
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NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 485-9086
Mfr. Part No.BDX53C
MYR4.42
Each (In a Pack of 5)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 168-8977
Mfr. Part No.ULN2801A
MYR4.043
Each (In a Tube of 20)
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- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 102-4094
Mfr. Part No.BDX53C
MYR3.77
Each (In a Tube of 50)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 168-6084
Mfr. Part No.BU941ZPFI
MYR15.152
Each (In a Tube of 30)
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NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 419-1144
Mfr. Part No.BU941ZPFI
MYR17.78
Each
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NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 313-6944
Mfr. Part No.BD677
MYR2.03
Each
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NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 633-650
Mfr. Part No.ULN2068B
MYR13.60
Each
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NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 168-6447
Mfr. Part No.ULN2804A
MYR4.671
Each (In a Tube of 20)
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- - 50 V - PDIP Through Hole 18 - - - - - - -
RS Stock No. 920-8979
Mfr. Part No.ULN2068B
MYR10.594
Each (In a Tube of 25)
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NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 686-8199
Mfr. Part No.ULN2804A
MYR4.043
Each (In a Pack of 10)
units
NPN 0.5 A 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 103-1078
Mfr. Part No.TIP122
MYR2.321
Each (In a Tube of 50)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 102-4098
Mfr. Part No.BD677
MYR1.47
Each (In a Tube of 50)
units
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V