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. 865-2097
FabrikantnummerBCV27,215
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0,077 €
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Aantal stuks
NPN 500 mA 30 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 4000 1.5 V 40 V 1 V
RS-stocknr. 725-8464
FabrikantnummerBCV47,215
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0,251 €
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NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 169-0631
FabrikantnummerBCV47,215
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0,057 €
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Aantal stuks
NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 725-8467
FabrikantnummerBSP51,115
FabrikantNexperia
0,401 €
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Aantal stuks
NPN 1 A 60 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 80 V 1.3 V
RS-stocknr. 725-8461
FabrikantnummerBSP61,115
FabrikantNexperia
0,401 €
Each (In a Pack of 10)
Aantal stuks
PNP -1 A 60 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -80 V -1.3 V
RS-stocknr. 484-2707
FabrikantnummerBST52,115
FabrikantNexperia
0,18 €
Each (In a Pack of 5)
Aantal stuks
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS-stocknr. 484-5251
FabrikantnummerBSP50,115
FabrikantNexperia
0,425 €
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NPN 1 A 45 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS-stocknr. 816-7817
FabrikantnummerBST51
FabrikantNexperia
0,269 €
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NPN 1 A 60 V 5 V SOT-89 Surface Mount 3 - Single 2 1000 1.9 V 80 V 1.3 V
RS-stocknr. 484-2690
FabrikantnummerBST50,115
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0,486 €
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NPN 1 A 45 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS-stocknr. 165-8645
FabrikantnummerBST51
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0,21 €
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NPN 1 A 60 V 5 V SOT-89 Surface Mount 3 - Single 2 1000 1.9 V 80 V 1.3 V
RS-stocknr. 792-0888
FabrikantnummerBSP62,115
FabrikantNexperia
0,402 €
Each (On a Reel of 20)
Aantal stuks
PNP -1 A 80 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -90 V -1.3 V
RS-stocknr. 166-0488
FabrikantnummerBSP61,115
FabrikantNexperia
0,19 €
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Aantal stuks
PNP -1 A 60 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -80 V -1.3 V
RS-stocknr. 103-5699
FabrikantnummerBCV49,115
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0,119 €
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NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 792-0914
FabrikantnummerBST62,115
FabrikantNexperia
0,41 €
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PNP -1 A 80 V -5 V SOT-89 Surface Mount 3 - Single 1 1000 -1.9 V -90 V -1.3 V
RS-stocknr. 816-7811
FabrikantnummerBST60
FabrikantNexperia
0,28 €
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Aantal stuks
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS-stocknr. 166-1532
FabrikantnummerBST52,115
FabrikantNexperia
0,177 €
Each (On a Reel of 1000)
Aantal stuks
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS-stocknr. 166-1462
FabrikantnummerBSP52,115
FabrikantNexperia
0,19 €
Each (On a Reel of 1000)
Aantal stuks
NPN 1 A 80 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS-stocknr. 865-2090
FabrikantnummerBCV46,215
FabrikantNexperia
0,033 €
Each (In a Pack of 100)
Aantal stuks
PNP -500 mA 60 V -10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 2000 -1.5 V -80 V -1 V
RS-stocknr. 165-8643
FabrikantnummerBST60
FabrikantNexperia
0,21 €
Each (On a Reel of 1000)
Aantal stuks
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS-stocknr. 165-9985
FabrikantnummerBSP62,115
FabrikantNexperia
0,19 €
Each (On a Reel of 1000)
Aantal stuks
PNP -1 A 80 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -90 V -1.3 V