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. 102-4103
FabrikantnummerBDW94C
€ 0,647
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PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
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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
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FabrikantON Semiconductor
€ 10,166
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PNP 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS-stocknr. 652-825
FabrikantnummerULN2004AN
€ 2,21
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 168-8603
FabrikantnummerBU931T
€ 1,994
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NPN 10 A 400 V 5 V TO-220 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS-stocknr. 774-3202
FabrikantnummerMJ11033G
FabrikantON Semiconductor
€ 13,09
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PNP 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS-stocknr. 163-1230
FabrikantnummerTIP122G
FabrikantON Semiconductor
€ 0,431
Each (In a Tube of 50)
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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. 484-2690
FabrikantnummerBST50,115
FabrikantNexperia
€ 0,244
Each (In a Pack of 5)
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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. 166-1531
FabrikantnummerBST50,115
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€ 0,28
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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. 121-8459
FabrikantnummerULN2004AN
€ 0,528
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-stocknr. 810-3668
FabrikantnummerST901T
€ 0,948
Each (In a Pack of 10)
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NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS-stocknr. 829-4020
FabrikantnummerBU931T
€ 2,325
Each (In a Pack of 2)
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NPN 10 A 400 V 5 V TO-220 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS-stocknr. 917-3374
FabrikantnummerULN2801A
€ 0,902
Each (In a Pack of 10)
Aantal stuks
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS-stocknr. 102-4095
FabrikantnummerTIP102
€ 0,507
Each (In a Tube of 50)
Aantal stuks
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS-stocknr. 545-0157
FabrikantnummerBU323ZG
FabrikantON Semiconductor
€ 2,32
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NPN 10 A 350 V 6 V SOT-93 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS-stocknr. 121-9878
FabrikantnummerMJH6284G
FabrikantON Semiconductor
€ 2,878
Each (In a Tube of 30)
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NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS-stocknr. 122-0289
FabrikantnummerBST52TA
FabrikantDiodesZetex
€ 0,127
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NPN 500 mA 80 V 10 V SOT-89 Surface Mount 3 - Single 1 1000 1.9 V 90 V 1.3 V
RS-stocknr. 858-203
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€ 2,21
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Aantal stuks
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RS-stocknr. 168-6448
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€ 0,388
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-stocknr. 485-9610
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