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. 168-6833
Mfr. Part No.ULN2803A
SGD0.761
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. 646-6311
Mfr. Part No.ULN2803ADW
SGD2.02
Each (In a Pack of 5)
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NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 866-0196
Mfr. Part No.ULN2803ADW
SGD1.461
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. 714-1167
Mfr. Part No.ULN2803A
SGD1.404
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. 100-3837
Mfr. Part No.ULN2003AN
SGD0.84
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. 109-090
Mfr. Part No.BD680
SGD0.70
Each
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PNP 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS Stock No. 714-2690
Mfr. Part No.BDX54C
SGD1.009
Each (In a Pack of 10)
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PNP 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 178-1409
Mfr. Part No.BD680
SGD0.399
Each (In a Tube of 50)
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PNP 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS Stock No. 781-4294
Mfr. Part No.MMBTA64LT1G
SGD0.045
Each (In a Pack of 100)
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PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 102-4105
Mfr. Part No.BDX54C
SGD0.564
Each (In a Tube of 50)
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PNP 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 145-3140
Mfr. Part No.MMBTA64LT1G
SGD0.031
Each (On a Reel of 3000)
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PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 168-6084
Mfr. Part No.BU941ZPFI
SGD3.384
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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
SGD5.50
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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. 485-9058
Mfr. Part No.BDW94C
SGD1.328
Each (In a Pack of 5)
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PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 102-4103
Mfr. Part No.BDW94C
SGD0.467
Each (In a Tube of 50)
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PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
SGD0.293
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
SGD0.673
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. 163-2365
Mfr. Part No.BD679AG
SGD0.489
Each (In a Box of 500)
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NPN 4 A 80 V 5 V TO-225 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 545-2349
Mfr. Part No.BD679AG
SGD0.944
Each (In a Pack of 5)
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NPN 4 A 80 V 5 V TO-225 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 790-5482
Mfr. Part No.TIP111G
SGD0.749
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NPN 2 A 80 V 5 V TO-220 Through Hole 3 - Single 1 500 - 80 V 2.5 V
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