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. 877-2946
Mfr. Part No.STP03D200
SGD9.21
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NPN 100 mA 1200 V 20 V TO-220 Through Hole 3 - Single 1 230 @ 20 mA @ 10 V 2 V 2000 V 2 V
RS Stock No. 808-0502
Mfr. Part No.TIP120TU
SGD1.334
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 60 V 4 V
RS Stock No. 545-0242
Mfr. Part No.MJD31CG
SGD0.81
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NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 - - 100 V -
RS Stock No. 168-6440
Mfr. Part No.ULQ2003D1013TR
SGD0.38
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 168-6448
Mfr. Part No.ULN2004A
SGD0.962
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 463-117
Mfr. Part No.BSP52T1G
SGD0.422
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NPN 1 A 80 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 464-136
Mfr. Part No.MJD31CT4G
SGD0.653
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NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 - - 100 V -
RS Stock No. 178-7525
Mfr. Part No.BSP52T1G
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- - - - - - - - - - - - - -
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NPN 15 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 250 - 100 V 3 V
RS Stock No. 790-5397
Mfr. Part No.MJH11022G
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NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
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Mfr. Part No.TIP120TU
SGD1.334
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 60 V 4 V
RS Stock No. 313-6944
Mfr. Part No.BD677
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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. 800-9702
Mfr. Part No.BSP52T3G
SGD0.422
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NPN 1 A 80 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.9 V 90 V 1.3 V
RS Stock No. 774-3246
Mfr. Part No.2N6052G
SGD10.68
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PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 168-6441
Mfr. Part No.MJD117T4
SGD0.302
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PNP 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
RS Stock No. 686-8203
Mfr. Part No.ULN2004A
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 686-8133
Mfr. Part No.ULQ2003D1013TR
SGD0.931
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 168-8883
Mfr. Part No.STP03D200
SGD7.78
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NPN 100 mA 1200 V 20 V TO-220 Through Hole 3 - Single 1 230 @ 20 mA @ 10 V 2 V 2000 V 2 V
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Mfr. Part No.2N6052G
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PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 102-4100
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NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V