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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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
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RS Stock No. 186-7435
Mfr. Part No.TIP100G
HK$6.021
Each (In a Tube of 50)
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NPN 5 A dc 60 V dc 5 V dc TO-220 Through Hole 3 Single Single 1 200 - 60 V dc 2.5 V dc
RS Stock No. 165-7481
Mfr. Part No.MJD127T4
HK$1.369
Each (On a Reel of 2500)
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PNP 5 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 124-5436
Mfr. Part No.TIP127G
HK$4.384
Each (In a Tube of 50)
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PNP 5 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 166-3381
Mfr. Part No.BSP50
HK$1.131
Each (On a Reel of 4000)
units
NPN 800 mA 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 484-2331
Mfr. Part No.BCV49,115
BrandNexperia
HK$2.387
Each (In a Pack of 10)
units
NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 738-5024
Mfr. Part No.FMMT734TA
HK$3.62
Each (In a Pack of 25)
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PNP -800 mA 100 V - SOT-23 Surface Mount 3 - Single 1 5000 -1.75 V -100 V -0.75 V
RS Stock No. 145-3358
Mfr. Part No.MMBTA14LT1G
HK$0.225
Each (On a Reel of 3000)
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NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 - 30 V 1.5 V
RS Stock No. 274-964
Mfr. Part No.FZT705TC
HK$5.842
Each (In a Pack of 5)
units
PNP 2 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 110-7440
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
HK$1.53
Each (In a Pack of 100)
units
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. 165-7482
Mfr. Part No.ULN2002D1013TR
HK$1.181
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 806-4560
Mfr. Part No.KSH127TF
HK$2.804
Each (In a Pack of 20)
units
PNP -8 A 100 V -5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 -4.5 V -100 V -2 V
RS Stock No. 165-8643
Mfr. Part No.BST60
BrandNexperia
HK$2.555
Each (On a Reel of 1000)
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PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS Stock No. 671-1125
Mfr. Part No.BCV27
HK$0.883
Each (In a Pack of 25)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 633-672
Mfr. Part No.ULN2075B
HK$25.13
Each
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NPN 1.75 A 80 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.5 V
RS Stock No. 633-644
Mfr. Part No.ULN2074B
HK$22.27
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NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 866-0196
Mfr. Part No.ULN2803ADW
HK$8.402
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 809-5488
Mfr. Part No.ULN2003V12DR
HK$4.06
Each (In a Pack of 5)
units
NPN 140 mA 20 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.75 V
RS Stock No. 168-6449
Mfr. Part No.ULN2002A
HK$3.904
Each (In a Tube of 25)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 463-010
Mfr. Part No.BD681G
HK$4.604
Each (In a Pack of 10)
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NPN 4 A 100 V 5 V TO-225 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 180-7427
Mfr. Part No.TCMD4000
BrandVishay
HK$7.858
Each (On a Reel of 2000)
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