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. 866-0196
FabrikantnummerULN2803ADW
1,132 €
Each (In a Tube of 40)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS-stocknr. 646-6311
FabrikantnummerULN2803ADW
1,338 €
Each (In a Pack of 5)
Aantal stuks
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS-stocknr. 923-6661
FabrikantnummerULN2003AID
0,519 €
Each (In a Tube of 40)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 665-9197
FabrikantnummerULN2003AID
0,581 €
Each (In a Pack of 10)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 922-2987
FabrikantnummerULN2003ADR
0,205 €
Each (On a Reel of 2500)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 144-9908
FabrikantnummerULN2002AN
0,874 €
Each (In a Tube of 25)
Aantal stuks
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 536-0903
FabrikantnummerDS2003TM/NOPB
0,804 €
Each (In a Pack of 10)
Aantal stuks
NPN 500 mA 55 V 6 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 665-8699
FabrikantnummerULN2003ADR
0,42 €
Each (In a Pack of 10)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 652-819
FabrikantnummerULN2002AN
2,21 €
Each
Aantal stuks
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 145-5964
FabrikantnummerDS2003TM/NOPB
0,715 €
Each (In a Tube of 48)
Aantal stuks
NPN 500 mA 55 V 6 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 121-8478
FabrikantnummerULN2003AD
0,496 €
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 809-5488
FabrikantnummerULN2003V12DR
0,50 €
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NPN 140 mA 20 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.75 V
RS-stocknr. 162-6796
FabrikantnummerULN2003V12DR
0,191 €
Each (On a Reel of 2500)
Aantal stuks
NPN 140 mA 20 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.75 V
RS-stocknr. 517-0766
FabrikantnummerSN75468D
0,798 €
Each (In a Pack of 5)
Aantal stuks
NPN 500 mA 100 V - SOIC Surface Mount 16 - Common Emitter 7 - - - -
RS-stocknr. 178-9082
FabrikantnummerSN75469NE4
0,988 €
Each (In a Tube of 25)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 665-8696
FabrikantnummerULQ2003ADR
0,455 €
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Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 145-0190
FabrikantnummerULN2003APW
0,496 €
Each (In a Tube of 90)
Aantal stuks
NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 809-5475
FabrikantnummerULN2003LVDR
2,21 €
Each
Aantal stuks
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS-stocknr. 145-0726
FabrikantnummerULQ2003AD
0,519 €
Each (In a Tube of 40)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 162-7586
FabrikantnummerULN2004AID
0,593 €
Each (In a Tube of 40)
Aantal stuks
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V