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
RS Stock No. 823-1384
Mfr. Part No.FMMTA14TA
HK$1.506
Each (In a Pack of 25)
units
NPN 300 mA 40 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 40 V 1 V
RS Stock No. 751-3534
Mfr. Part No.BCX38C
HK$3.87
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NPN 800 mA 60 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 712-2879
Mfr. Part No.MMBTA28-7-F
HK$1.003
Each (In a Pack of 50)
units
NPN 500 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 80 V 1.5 V
RS Stock No. 823-1401
Mfr. Part No.FZT600BTA
HK$4.359
Each (In a Pack of 10)
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NPN 2 A 140 V 160 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 1.9 V 160 V 1.2 V
RS Stock No. 823-3025
Mfr. Part No.MMBT6427-7-F
HK$0.506
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NPN 500 mA 40 V 12 V SOT-23 Surface Mount 3 - Single 1 20000 2 V 40 V 1.5 V
RS Stock No. 922-7948
Mfr. Part No.FMMT634TA
HK$1.59
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NPN 900 mA 100 V 12 V SOT-23 Surface Mount 3 - Single 1 5000 1.65 V 120 V 0.96 V
RS Stock No. 921-0824
Mfr. Part No.ULN2004AS16-13
HK$2.705
Each (In a Pack of 30)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 122-2358
Mfr. Part No.FCX605TA
HK$2.10
Each (On a Reel of 1000)
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NPN 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 5000 1.8 V 140 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. 751-3531
Mfr. Part No.BCV47TA
HK$0.677
Each (In a Pack of 100)
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NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 738-4910
Mfr. Part No.BCV49TA
HK$2.784
Each (On a Tape of 25)
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NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 712-2873
Mfr. Part No.ZXTN04120HFFTA
HK$3.422
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. 823-3043
Mfr. Part No.MMBTA63-7-F
HK$0.366
Each (In a Pack of 200)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 1 10000 -2 V -30 V -1.5 V
RS Stock No. 655-593
Mfr. Part No.ZTX605
HK$6.712
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NPN 1 A 120 V 10 V E-Line Through Hole 3 - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 122-2846
Mfr. Part No.BCV46TA
HK$0.814
Each (On a Reel of 3000)
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PNP -500 mA 60 V -10 V SOT-23 Surface Mount 3 - Single 1 10000 -1.5 V -80 V -1 V
RS Stock No. 669-7304
Mfr. Part No.FZT705TA
HK$4.682
Each (In a Pack of 10)
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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. 738-5024
Mfr. Part No.FMMT734TA
HK$3.62
Each (In a Pack of 25)
units
PNP -800 mA 100 V - SOT-23 Surface Mount 3 - Single 1 5000 -1.75 V -100 V -0.75 V
RS Stock No. 121-9450
Mfr. Part No.MMBTA28-7-F
HK$0.412
Each (On a Reel of 3000)
units
NPN 500 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 80 V 1.5 V
RS Stock No. 712-2882
Mfr. Part No.ZXTP05120HFFTA
HK$4.201
Each (In a Pack of 10)
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PNP -1 A 120 V -10 V SOT-23F Surface Mount 3 - Single 2 2000 -1.7 V -140 V -2 V
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NPN 1.5 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 500 1.8 V 140 V 1.5 V