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. 665-9197
Mfr. Part No.ULN2003AID
HK$4.614
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 923-6661
Mfr. Part No.ULN2003AID
HK$4.615
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 100-3837
Mfr. Part No.ULN2003AN
HK$4.81
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 922-2987
Mfr. Part No.ULN2003ADR
HK$1.782
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 436-8451
Mfr. Part No.ULN2003AN
HK$4.60
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
HK$4.264
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 858-196
Mfr. Part No.ULN2003AD
HK$4.60
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 732-0887
Mfr. Part No.ULN2003AINE4
HK$5.732
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 921-5181
Mfr. Part No.ULN2003AIN
HK$5.16
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-8699
Mfr. Part No.ULN2003ADR
HK$4.391
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-8696
Mfr. Part No.ULQ2003ADR
HK$4.099
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 162-6795
Mfr. Part No.ULN2003LVDR
HK$2.12
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 145-0726
Mfr. Part No.ULQ2003AD
HK$4.841
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
HK$5.47
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 665-9190
Mfr. Part No.ULN2003APW
HK$4.264
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NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 145-0190
Mfr. Part No.ULN2003APW
HK$4.264
Each (In a Tube of 90)
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NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-9204
Mfr. Part No.ULQ2003AD
HK$4.841
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 162-7587
Mfr. Part No.ULQ2003ADR
HK$2.05
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8459
Mfr. Part No.ULN2004AN
HK$4.738
Each (In a Tube of 25)
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
HK$13.658
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NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V