Darlington Pairs

Darlington pairs, also known as Darlington Transistors are discrete semiconductor devices consisting of a package of two standard BJT transistors (bipolar junction transistor). One of the transistors is high-gain while the other is high current. RS Components offer a wide range of high-quality Darlington Transistors from leading brands including ON Semiconductor, STMicroelectronics, Texas Instruments and Nexperia.

How do they work?

The emitter of one transistor is connected to the base of the other transistor which effectively creates one transistor. 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 microcontroller 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.

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 (PCB) printed circuit board.

What applications would 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.

What are the 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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Description Price 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 Stock No. 485-9610
Mfr. Part No.TIP102
$1.326
Each (In a Pack of 5)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS Stock No. 802-2979
Mfr. Part No.BD682STU
$0.848
Each (In a Pack of 20)
units
PNP -4 A 100 V -5 V TO-126 Through Hole 3 - Single 1 750 - -100 V -2.5 V
RS Stock No. 168-7874
Mfr. Part No.ST901T
$1.67
Each (In a Tube of 50)
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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 Stock No. 806-5046
Mfr. Part No.NJD35N04T4G
$1.319
Each (On a Tape of 25)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS Stock No. 810-3668
Mfr. Part No.ST901T
$1.568
Each (In a Pack of 10)
units
NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS Stock No. 463-010
Mfr. Part No.BD681G
$1.199
Each (In a Pack of 10)
units
NPN 4 A 100 V 5 V TO-225 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
$2.682
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 169-8596
Mfr. Part No.BD682STU
$0.881
Each (In a Tube of 60)
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PNP -4 A 100 V -5 V TO-126 Through Hole 3 - Single 1 750 - -100 V -2.5 V
RS Stock No. 485-9042
Mfr. Part No.BDW93C
$1.772
Each (In a Pack of 5)
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NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 103-2945
Mfr. Part No.BU323ZG
$3.97
Each (In a Tube of 30)
units
NPN 10 A 350 V 6 V TO-247 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS Stock No. 145-2940
Mfr. Part No.NJD35N04G
$1.292
Each (In a Tube of 75)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 866-0196
Mfr. Part No.ULN2803ADW
$2.255
Each (In a Tube of 40)
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NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 805-4412
Mfr. Part No.NJD35N04G
$1.292
Each (In a Pack of 25)
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NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 124-6448
Mfr. Part No.BA12003BF-E2
BrandROHM
$0.434
Each (In a Pack of 20)
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NPN 500 mA 60 V - SOP Surface Mount 16 Array 7 Common Emitter 7 1000 - - 1.6 V
RS Stock No. 102-4095
Mfr. Part No.TIP102
$1.055
Each (In a Tube of 50)
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
$1.10
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 102-4092
Mfr. Part No.BDW93C
$1.258
Each (In a Tube of 50)
units
NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 163-0785
Mfr. Part No.NJD35N04T4G
$0.696
Each (On a Reel of 2500)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS Stock No. 102-4091
Mfr. Part No.TIP142
$2.64
Each (In a Tube of 30)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 163-1230
Mfr. Part No.TIP122G
$0.983
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