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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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. 122-0139
Mfr. Part No.MJ11033G
HK$79.36
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. 121-9878
Mfr. Part No.MJH6284G
HK$26.918
Each (In a Tube of 30)
units
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$35.59
Each (In a Pack of 2)
units
NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 774-3202
Mfr. Part No.MJ11033G
HK$90.59
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. 163-0033
Mfr. Part No.MJ11012G
HK$30.48
Each (In a Tray of 100)
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. 862-4954
Mfr. Part No.MJ11012G
HK$33.705
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. 545-2513
Mfr. Part No.BDW42G
HK$5.748
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. 808-0515
Mfr. Part No.TIP122TU
HK$3.421
Each (In a Pack of 25)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 100 V 4 V
RS Stock No. 169-8766
Mfr. Part No.TIP122TU
HK$2.892
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 100 V 4 V
RS Stock No. 163-2366
Mfr. Part No.BDW42G
HK$4.478
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. 124-5325
Mfr. Part No.MJH11022G
HK$26.721
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. 545-0494
Mfr. Part No.TIP102G
HK$14.49
Each
units
NPN 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS Stock No. 790-5397
Mfr. Part No.MJH11022G
HK$32.42
Each (In a Pack of 2)
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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$6.672
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 774-3653
Mfr. Part No.TIP120G
HK$4.15
Each (In a Pack of 10)
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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. 145-3154
Mfr. Part No.2N6667G
HK$4.877
Each (In a Tube of 50)
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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. 100-7565
Mfr. Part No.MJ11016G
HK$30.307
Each (In a Tray of 100)
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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$43.605
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. 103-5055
Mfr. Part No.MJ11015G
HK$22.39
Each (In a Tray of 100)
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. 125-0077
Mfr. Part No.MJF122G
HK$6.337
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220FP Through Hole 3 - Single 1 1000 - 100 V 3.5 V dc