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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Description Price Transistor Type Maximum Continuous Collector Current Maximum Collector Emitter Voltage Maximum Emitter Base Voltage Package Type Mounting Type Pin Count Configuration Transistor Configuration Number of Elements per Chip Minimum DC Current Gain Maximum Base Emitter Saturation Voltage Maximum Collector Base Voltage Maximum Collector Emitter Saturation Voltage
RS Stock No. 103-5146
Mfr. Part No.TIP120G
€0.442
Each (In a Tube of 50)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 774-3653
Mfr. Part No.TIP120G
€0.442
Each (In a Pack of 10)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 178-4739
Mfr. Part No.TIP102G
€0.639
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 545-0494
Mfr. Part No.TIP102G
€0.77
Each
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NPN 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS Stock No. 903-4103
Mfr. Part No.BC516_D27Z
€0.111
Each (In a Pack of 100)
units
PNP -1 A 30 V -10 V TO-92 Through Hole 3 - Single 1 30000 - -40 V -1 V
RS Stock No. 124-1409
Mfr. Part No.TIP126TU
€0.532
Each (In a Tube of 50)
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PNP -5 A 80 V -5 V TO-220 Through Hole 3 - Single 2 1000 - -80 V -2 V
RS Stock No. 808-0512
Mfr. Part No.TIP126TU
€0.522
Each (In a Pack of 25)
units
PNP -5 A 80 V -5 V TO-220 Through Hole 3 - Single 2 1000 - -80 V -2 V
RS Stock No. 145-2830
Mfr. Part No.TIP125G
€0.505
Each (In a Tube of 50)
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PNP 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 463-010
Mfr. Part No.BD681G
€0.474
Each (In a Pack of 10)
units
NPN 4 A 100 V 5 V TO-225 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 122-0072
Mfr. Part No.BD681G
€0.288
Each (In a Box of 500)
units
NPN 4 A 100 V 5 V TO-225 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 774-3650
Mfr. Part No.TIP125G
€0.61
Each (In a Pack of 5)
units
PNP 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 145-4628
Mfr. Part No.TIP110TU
€0.635
Each (In a Tube of 50)
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NPN 4 A 60 V 5 V TO-220 Through Hole 3 - Single 2 500 - 60 V 2.5 V
RS Stock No. 808-0495
Mfr. Part No.TIP110TU
€0.635
Each (In a Pack of 10)
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NPN 4 A 60 V 5 V TO-220 Through Hole 3 - Single 2 500 - 60 V 2.5 V
RS Stock No. 545-2361
Mfr. Part No.TIP127G
€0.61
Each
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PNP 5 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 178-4695
Mfr. Part No.MMBTA13LT3G
€0.014
Each (On a Reel of 10000)
units
- - - - - - - - - - - - - -
RS Stock No. 169-8767
Mfr. Part No.TIP147TTU
€0.805
Each (In a Tube of 50)
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PNP -10 A 100 V -5 V TO-220 Through Hole 3 - Single 2 500 -3.5 V -100 V -2 V
RS Stock No. 163-0839
Mfr. Part No.2N6040G
€0.627
Each (In a Tube of 50)
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PNP 8 A 60 V 5 V TO-220AB Through Hole 3 - Single 1 100 4.5 V 60 V 2 V
RS Stock No. 808-0521
Mfr. Part No.TIP147TTU
€0.805
Each (In a Pack of 10)
units
PNP -10 A 100 V -5 V TO-220 Through Hole 3 - Single 2 500 -3.5 V -100 V -2 V
RS Stock No. 781-4279
Mfr. Part No.MMBTA13LT1G
€0.05
Each (In a Pack of 100)
units
NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 1.5 V 30 V 1.5 V
RS Stock No. 122-0090
Mfr. Part No.TIP107G
€0.625
Each (In a Tube of 50)
units
PNP 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 200 - 100 V 2.5 V