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. 714-1167
Mfr. Part No.ULN2803A
$2.258
Each (In a Pack of 5)
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 774-3653
Mfr. Part No.TIP120G
$0.962
Each (In a Pack of 10)
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 122-0071
Mfr. Part No.MJ11016G
$10.059
Each (In a Tray of 100)
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 463-000
Mfr. Part No.MJ11016G
$13.72
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 103-5146
Mfr. Part No.TIP120G
$1.045
Each (In a Tube of 50)
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 168-6833
Mfr. Part No.ULN2803A
$2.051
Each (In a Tube of 20)
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 166-2727
Mfr. Part No.KSP13BU
$0.079
Each (In a Bag of 10000)
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NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 858-196
Mfr. Part No.ULN2003AD
$1.21
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 100-7565
Mfr. Part No.MJ11016G
$10.059
Each (In a Tray of 100)
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 166-1922
Mfr. Part No.MMBTA14
$0.083
Each (On a Reel of 3000)
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NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 30 V 1.5 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
$0.99
Each (In a Tube of 40)
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 922-2987
Mfr. Part No.ULN2003ADR
$0.342
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 485-9058
Mfr. Part No.BDW94C
$2.12
Each (In a Pack of 5)
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PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 251-3299
Mfr. Part No.TIP125
$1.16
Each
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PNP 5 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 102-4089
Mfr. Part No.TIP142T
$2.07
Each (In a Tube of 50)
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NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 109-084
Mfr. Part No.BD679
BrandMagnatec
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NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
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Mfr. Part No.BD681G
$0.995
Each (In a Pack of 10)
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NPN 4 A 100 V 5 V TO-225 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 805-4412
Mfr. Part No.NJD35N04G
$1.292
Each (In a Pack of 25)
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NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 145-2940
Mfr. Part No.NJD35N04G
$1.291
Each (In a Tube of 75)
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NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 168-7874
Mfr. Part No.ST901T
$1.67
Each (In a Tube of 50)
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NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V