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 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. 109-084
Mfr. Part No.BD679
BrandMagnatec
kr 6,52
Each
Units
NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
kr 7,84
Each (In a Tube of 25)
Units
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
kr 7,512
Each (In a Pack of 20)
Units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 633-638
Mfr. Part No.ULN2064B
kr 103,06
Each
Units
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 739-0344
Mfr. Part No.KSP13BU
Brandonsemi
kr 3,136
Each (In a Pack of 10)
Units
NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 920-8975
Mfr. Part No.ULN2064B
kr 90,233
Each (In a Tube of 25)
Units
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 166-2727
Mfr. Part No.KSP13BU
Brandonsemi
kr 0,661
Each (In a Bag of 10000)
Units
NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 686-8161
Mfr. Part No.ULN2004D1013TR
kr 7,871
Each (In a Pack of 20)
Units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 165-7772
Mfr. Part No.ULN2004D1013TR
kr 3,28
Each (On a Reel of 2500)
Units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 485-9086
Mfr. Part No.BDX53C
kr 18,938
Each (In a Pack of 5)
Units
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. 714-1167
Mfr. Part No.ULN2803A
kr 30,244
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. 168-6833
Mfr. Part No.ULN2803A
kr 32,212
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. 102-4094
Mfr. Part No.BDX53C
kr 16,174
Each (In a Tube of 50)
Units
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. 790-5315
Mfr. Part No.MJD112-1G
Brandonsemi
kr 8,226
Each (In a Pack of 15)
Units
NPN 2 A 100 V 5 V IPAK (TO-251) Through Hole 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 178-4811
Mfr. Part No.MJD112-1G
Brandonsemi
kr 8,359
Each (In a Tube of 75)
Units
NPN 2 A 100 V 5 V IPAK (TO-251) Through Hole 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 808-0512
Mfr. Part No.TIP126TU
Brandonsemi
kr 9,271
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. 124-1409
Mfr. Part No.TIP126TU
Brandonsemi
kr 9,269
Each (In a Tube of 50)
Units
PNP -5 A 80 V -5 V TO-220 Through Hole 3 - Single 2 1000 - -80 V -2 V
RS Stock No. 162-7586
Mfr. Part No.ULN2004AID
kr 2,45
Each (In a Tube of 40)
Units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 100-3837
Mfr. Part No.ULN2003AN
kr 9,258
Each (In a Tube of 25)
Units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 145-4629
Mfr. Part No.TIP120TU
Brandonsemi
kr 9,958
Each (In a Tube of 50)
Units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 60 V 4 V