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. 686-8199
Mfr. Part No.ULN2804A
MYR4.043
Each (In a Pack of 10)
units
NPN 0.5 A 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 633-650
Mfr. Part No.ULN2068B
MYR13.60
Each
units
NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 313-6944
Mfr. Part No.BD677
MYR2.03
Each
units
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 103-1078
Mfr. Part No.TIP122
MYR2.321
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 162-6795
Mfr. Part No.ULN2003LVDR
MYR1.328
Each (On a Reel of 2500)
units
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 145-3154
Mfr. Part No.2N6667G
MYR3.486
Each (In a Tube of 50)
units
PNP 10 A 60 V 5 V TO-220AB Through Hole 3 - Single 1 1000 4.5 V dc 60 V dc 3 V dc
RS Stock No. 168-6447
Mfr. Part No.ULN2804A
MYR4.671
Each (In a Tube of 20)
units
- - 50 V - PDIP Through Hole 18 - - - - - - -
RS Stock No. 920-8979
Mfr. Part No.ULN2068B
MYR10.594
Each (In a Tube of 25)
units
NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 922-2987
Mfr. Part No.ULN2003ADR
MYR1.125
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 858-196
Mfr. Part No.ULN2003AD
MYR2.34
Each
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
MYR2.111
Each (In a Tube of 40)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 102-4098
Mfr. Part No.BD677
MYR1.47
Each (In a Tube of 50)
units
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 100-3837
Mfr. Part No.ULN2003AN
MYR22.122
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. 436-8451
Mfr. Part No.ULN2003AN
MYR22.29
Each
units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
MYR2.85
Each
units
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
MYR0.357
Each (In a Pack of 50)
units
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 709-2879
Mfr. Part No.SN75469NE4
MYR4.93
Each (In a Pack of 5)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 178-9082
Mfr. Part No.SN75469NE4
MYR4.86
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 485-8667
Mfr. Part No.TIP142T
MYR6.436
Each (In a Pack of 5)
units
NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 100-7565
Mfr. Part No.MJ11016G
MYR22.679
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