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. 166-1531
FabrikantnummerBST50,115
FabrikantNexperia
€ 0,233
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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. 168-7874
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€ 0,894
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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. 484-2690
FabrikantnummerBST50,115
FabrikantNexperia
€ 0,536
Each (In a Pack of 5)
Aantal stuks
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
€ 0,493
Each (In a Tube of 25)
Aantal stuks
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 652-825
FabrikantnummerULN2004AN
€ 0,60
Each
Aantal stuks
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS-stocknr. 774-3202
FabrikantnummerMJ11033G
FabrikantON Semiconductor
€ 14,63
Each
Aantal stuks
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
€ 0,48
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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. 168-8603
FabrikantnummerBU931T
€ 1,717
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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. 810-3668
FabrikantnummerST901T
€ 0,967
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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. 122-0139
FabrikantnummerMJ11033G
FabrikantON Semiconductor
€ 11,148
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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. 485-9058
FabrikantnummerBDW94C
€ 0,816
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PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS-stocknr. 103-5055
FabrikantnummerMJ11015G
FabrikantON Semiconductor
€ 4,872
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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
€ 6,83
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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. 829-4020
FabrikantnummerBU931T
€ 2,365
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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. 790-5407
FabrikantnummerMJH6284G
FabrikantON Semiconductor
€ 3,385
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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. 168-6448
FabrikantnummerULN2004A
€ 0,385
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS-stocknr. 738-4936
FabrikantnummerBST52TA
FabrikantDiodesZetex
€ 0,327
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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. 103-2945
FabrikantnummerBU323ZG
FabrikantON Semiconductor
€ 1,98
Each (In a Tube of 30)
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NPN 10 A 350 V 6 V TO-247 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS-stocknr. 486-0014
FabrikantnummerBD679A
€ 0,642
Each (In a Pack of 5)
Aantal stuks
NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS-stocknr. 917-3374
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Each (In a Pack of 10)
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- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
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