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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RS Stock No. 858-196
Mfr. Part No.ULN2003AD
TWD20.00
Each
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 781-4279
Mfr. Part No.MMBTA13LT1G
TWD2.00
Each (In a Pack of 100)
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NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 1.5 V 30 V 1.5 V
RS Stock No. 436-8451
Mfr. Part No.ULN2003AN
TWD21.00
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 145-9578
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
TWD4.10
Each (On a Reel of 1000)
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PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS Stock No. 110-7440
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
TWD6.90
Each (In a Pack of 100)
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PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS Stock No. 781-4288
Mfr. Part No.MMBTA13LT3G
TWD2.00
Each (On a Tape of 100)
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NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 1.5 V 30 V 1.5 V
RS Stock No. 485-8667
Mfr. Part No.TIP142T
TWD49.00
Each (In a Pack of 5)
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NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 102-4096
Mfr. Part No.TIP132
TWD19.40
Each (In a Tube of 50)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 4 V
RS Stock No. 665-8699
Mfr. Part No.ULN2003ADR
TWD16.20
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 Stock No. 633-638
Mfr. Part No.ULN2064B
TWD93.00
Each
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NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 484-2690
Mfr. Part No.BST50,115
BrandNexperia
TWD21.00
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 Stock No. 162-6795
Mfr. Part No.ULN2003LVDR
TWD8.40
Each (On a Reel of 2500)
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 712-2873
Mfr. Part No.ZXTN04120HFFTA
TWD15.10
Each (In a Pack of 10)
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NPN 1 A 120 V 10 V SOT-23F Surface Mount 3 - Single 2 1000 1.7 V 140 V 1.5 V
RS Stock No. 102-4089
Mfr. Part No.TIP142T
TWD41.60
Each (In a Tube of 50)
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NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
TWD21.00
Each
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
TWD16.10
Each (In a Tube of 40)
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 122-0677
Mfr. Part No.ZXTN04120HFFTA
TWD6.10
Each (On a Reel of 3000)
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NPN 1 A 120 V 10 V SOT-23F Surface Mount 3 - Single 2 1000 1.7 V 140 V 1.5 V
RS Stock No. 121-9878
Mfr. Part No.MJH6284G
TWD104.70
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 Stock No. 178-9082
Mfr. Part No.SN75469NE4
TWD38.50
Each (In a Tube of 25)
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- - - - - - - - - - - - - -
RS Stock No. 486-0301
Mfr. Part No.TIP147
TWD50.00
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PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V