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. 109-084
Mfr. Part No.BD679
BrandMagnatec
kr 3,69
Each
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NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS Stock No. 921-0824
Mfr. Part No.ULN2004AS16-13
kr 3,214
Each (In a Pack of 30)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 165-8351
Mfr. Part No.ULN2004AS16-13
kr 1,449
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
kr 3,525
Each (In a Tube of 25)
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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 3,52
Each (In a Pack of 20)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 920-8975
Mfr. Part No.ULN2064B
kr 20,434
Each (In a Tube of 25)
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NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 633-638
Mfr. Part No.ULN2064B
kr 24,03
Each
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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
kr 1,825
Each (In a Pack of 10)
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NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 166-2727
Mfr. Part No.KSP13BU
kr 0,326
Each (In a Bag of 10000)
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NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 165-7772
Mfr. Part No.ULN2004D1013TR
kr 1,224
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 686-8161
Mfr. Part No.ULN2004D1013TR
kr 3,171
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 714-1167
Mfr. Part No.ULN2803A
kr 10,25
Each (In a Pack of 5)
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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 8,694
Each (In a Tube of 20)
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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 7,418
Each (In a Tube of 50)
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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. 485-9086
Mfr. Part No.BDX53C
kr 4,168
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. 124-1409
Mfr. Part No.TIP126TU
kr 5,198
Each (In a Tube of 50)
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PNP -5 A 80 V -5 V TO-220 Through Hole 3 - Single 2 1000 - -80 V -2 V
RS Stock No. 790-5315
Mfr. Part No.MJD112-1G
kr 5,018
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. 903-4103
Mfr. Part No.BC516_D27Z
kr 1,03
Each (In a Pack of 100)
Units
PNP -1 A 30 V -10 V TO-92 Through Hole 3 - Single 1 30000 - -40 V -1 V
RS Stock No. 162-7586
Mfr. Part No.ULN2004AID
kr 2,702
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. 808-0512
Mfr. Part No.TIP126TU
kr 5,20
Each (In a Pack of 25)
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PNP -5 A 80 V -5 V TO-220 Through Hole 3 - Single 2 1000 - -80 V -2 V
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