Darlington Pairs

What are Darlington Pairs?

Darlington pairs, also called Darlington transistors, are a package of two standard BJT transistors (bipolar junction transistor). One of the transistors is high-gain while the other is high current. 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 micro controller 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.

How do they work?

The emitter of one transistor is connected to the base of the other transistor which effectively creates one transistor.

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 board.

What applications do 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.

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. 168-6833
Mfr. Part No.ULN2803A
MYR4.17
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. 714-1167
Mfr. Part No.ULN2803A
MYR4.87
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. 866-0196
Mfr. Part No.ULN2803ADW
MYR5.24
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
MYR6.508
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 102-4091
Mfr. Part No.TIP142
MYR6.803
Each (In a Tube of 30)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 486-0294
Mfr. Part No.TIP142
MYR7.69
Each (In a Pack of 5)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
MYR1.744
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
MYR1.92
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. 122-0139
Mfr. Part No.MJ11033G
MYR50.51
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. 774-3202
Mfr. Part No.MJ11033G
MYR65.07
Each
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. 102-4100
Mfr. Part No.TIP121
MYR2.081
Each (In a Tube of 50)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 485-9660
Mfr. Part No.TIP121
MYR2.59
Each (In a Pack of 5)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 168-8977
Mfr. Part No.ULN2801A
MYR3.927
Each (In a Tube of 20)
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- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 917-3374
Mfr. Part No.ULN2801A
MYR3.927
Each (In a Pack of 10)
units
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 168-6084
Mfr. Part No.BU941ZPFI
MYR13.42
Each (In a Tube of 30)
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NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 419-1144
Mfr. Part No.BU941ZPFI
MYR15.79
Each
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NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 485-9086
Mfr. Part No.BDX53C
MYR4.294
Each (In a Pack of 5)
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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. 102-4094
Mfr. Part No.BDX53C
MYR3.672
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. 865-2097
Mfr. Part No.BCV27,215
BrandNexperia
MYR0.384
Each (In a Pack of 100)
units
NPN 500 mA 30 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 4000 1.5 V 40 V 1 V
RS Stock No. 527-883
Mfr. Part No.SN75468N
MYR3.27
Each (In a Tube of 25)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - -