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. 774-3202
Mfr. Part No.MJ11033G
HK$151.66
Each
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PNP 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS Stock No. 121-9878
Mfr. Part No.MJH6284G
HK$30.009
Each (In a Tube of 30)
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NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 790-5407
Mfr. Part No.MJH6284G
HK$33.67
Each (In a Pack of 2)
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NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 122-0139
Mfr. Part No.MJ11033G
HK$130.439
Each (In a Tray of 100)
units
PNP 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS Stock No. 862-4954
Mfr. Part No.MJ11012G
HK$61.08
Each (In a Pack of 2)
units
NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 163-0033
Mfr. Part No.MJ11012G
HK$43.538
Each (In a Tray of 100)
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NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 124-5325
Mfr. Part No.MJH11022G
HK$31.74
Each (In a Tube of 30)
units
NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 178-4739
Mfr. Part No.TIP102G
HK$6.899
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 545-0494
Mfr. Part No.TIP102G
HK$8.81
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. 163-2366
Mfr. Part No.BDW42G
HK$6.972
Each (In a Tube of 50)
units
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
HK$38.095
Each (In a Pack of 2)
units
NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 545-2513
Mfr. Part No.BDW42G
HK$7.314
Each (In a Pack of 5)
units
NPN 15 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 250 - 100 V 3 V
RS Stock No. 103-5146
Mfr. Part No.TIP120G
HK$5.807
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. 688-1502
Mfr. Part No.MJ11015G
HK$78.53
Each (In a Pack of 2)
units
PNP 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 808-0502
Mfr. Part No.TIP120TU
HK$7.728
Each (In a Pack of 25)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 60 V 4 V
RS Stock No. 103-5055
Mfr. Part No.MJ11015G
HK$56.07
Each (In a Tray of 100)
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PNP 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 169-8767
Mfr. Part No.TIP147TTU
HK$7.684
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. 100-7565
Mfr. Part No.MJ11016G
HK$55.881
Each (In a Tray of 100)
units
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
HK$78.255
Each (In a Pack of 2)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 122-0071
Mfr. Part No.MJ11016G
HK$45.475
Each (In a Tray of 100)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V