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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Omschrijving Prijs 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-stocknr. 686-8209
FabrikantnummerULN2003A
€ 0,45
Each (In a Pack of 20)
Aantal stuks
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 168-6450
FabrikantnummerULN2003A
€ 0,402
Each (In a Tube of 25)
Aantal stuks
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 485-9660
FabrikantnummerTIP121
€ 0,814
Each (In a Pack of 5)
Aantal stuks
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS-stocknr. 102-4100
FabrikantnummerTIP121
€ 0,598
Each (In a Tube of 50)
Aantal stuks
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS-stocknr. 168-6833
FabrikantnummerULN2803A
€ 0,872
Each (In a Tube of 20)
Aantal stuks
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS-stocknr. 714-1167
FabrikantnummerULN2803A
€ 1,038
Each (In a Pack of 5)
Aantal stuks
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS-stocknr. 486-0294
FabrikantnummerTIP142
€ 1,608
Each (In a Pack of 5)
Aantal stuks
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS-stocknr. 102-4091
FabrikantnummerTIP142
€ 1,427
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS-stocknr. 919-6472
FabrikantnummerULN2003D1013TR
€ 0,144
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 426-229
FabrikantnummerULN2003D1013TR
€ 0,414
Each (In a Pack of 10)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 102-4097
FabrikantnummerBU931P
€ 2,323
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NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS-stocknr. 313-3197
FabrikantnummerBU931P
€ 2,73
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NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS-stocknr. 486-0301
FabrikantnummerTIP147
€ 1,87
Each
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PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS-stocknr. 419-1144
FabrikantnummerBU941ZPFI
€ 3,56
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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-stocknr. 102-4104
FabrikantnummerTIP147
€ 1,548
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PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS-stocknr. 313-3204
FabrikantnummerBD681
€ 2,29
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NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS-stocknr. 103-1078
FabrikantnummerTIP122
€ 0,451
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS-stocknr. 102-4093
FabrikantnummerBD681
€ 0,279
Each (In a Tube of 50)
Aantal stuks
NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS-stocknr. 168-6084
FabrikantnummerBU941ZPFI
€ 2,891
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-stocknr. 168-8603
FabrikantnummerBU931T
€ 1,931
Each (In a Tube of 50)
Aantal stuks
NPN 10 A 400 V 5 V TO-220 Through Hole 3 - Single 1 300 2.5 V - 1.8 V