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. 714-1167
FabrikantnummerULN2803A
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS-stocknr. 168-6833
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0,872 €
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS-stocknr. 168-6450
FabrikantnummerULN2003A
0,402 €
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 686-8209
FabrikantnummerULN2003A
0,45 €
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Aantal stuks
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 866-0196
FabrikantnummerULN2803ADW
1,109 €
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
1,442 €
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-stocknr. 803-1973
FabrikantnummerMMBTA14
FabrikantON Semiconductor
0,07 €
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NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 30 V 1.5 V
RS-stocknr. 166-1922
FabrikantnummerMMBTA14
FabrikantON Semiconductor
0,028 €
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NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 30 V 1.5 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. 486-0294
FabrikantnummerTIP142
1,608 €
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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. 103-5055
FabrikantnummerMJ11015G
FabrikantON Semiconductor
4,565 €
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PNP 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS-stocknr. 688-1502
FabrikantnummerMJ11015G
FabrikantON Semiconductor
6,045 €
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PNP 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS-stocknr. 102-4105
FabrikantnummerBDX54C
0,457 €
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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-stocknr. 714-2690
FabrikantnummerBDX54C
0,472 €
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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-stocknr. 122-0071
FabrikantnummerMJ11016G
FabrikantON Semiconductor
4,341 €
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS-stocknr. 463-000
FabrikantnummerMJ11016G
FabrikantON Semiconductor
5,89 €
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS-stocknr. 100-7565
FabrikantnummerMJ11016G
FabrikantON Semiconductor
4,341 €
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS-stocknr. 102-4089
FabrikantnummerTIP142T
1,081 €
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Aantal stuks
NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS-stocknr. 739-0344
FabrikantnummerKSP13BU
FabrikantON Semiconductor
0,232 €
Each (In a Pack of 10)
Aantal stuks
NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS-stocknr. 760-6043
FabrikantnummerMMBTA64
FabrikantON Semiconductor
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PNP -1.2 A 30 V -10 V SOT-23 Surface Mount 3 - Single 1 20000 - -30 V -1.5 V
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