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. 669-7638
Mfr. Part No.FMMT634TA
HK$4.764
Each (In a Pack of 5)
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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. 922-7762
Mfr. Part No.ZTX605
HK$3.769
Each (In a Bag of 4000)
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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. 823-1350
Mfr. Part No.FCX605TA
HK$3.822
Each (In a Pack of 25)
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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. 669-7552
Mfr. Part No.ZTX601B
HK$8.28
Each (In a Pack of 5)
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NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 5000 1.9 V 180 V 1.2 V
RS Stock No. 823-1384
Mfr. Part No.FMMTA14TA
HK$1.506
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NPN 300 mA 40 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 40 V 1 V
RS Stock No. 822-2163
Mfr. Part No.BCV46TA
HK$2.22
Each (In a Pack of 20)
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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. 669-7568
Mfr. Part No.FCX705TA
HK$4.501
Each (In a Pack of 10)
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PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 122-0289
Mfr. Part No.BST52TA
HK$1.194
Each (On a Reel of 1000)
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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 Stock No. 122-2846
Mfr. Part No.BCV46TA
HK$0.814
Each (On a Reel of 3000)
units
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. 922-7923
Mfr. Part No.ZTX601B
HK$3.215
Each (In a Bag of 4000)
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NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 5000 1.9 V 180 V 1.2 V
RS Stock No. 669-7329
Mfr. Part No.FMMT38CTA
HK$2.937
Each (In a Pack of 25)
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NPN 300 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 165-8529
Mfr. Part No.MMBT6427-7-F
HK$0.318
Each (On a Reel of 3000)
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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. 823-3043
Mfr. Part No.MMBTA63-7-F
HK$0.366
Each (In a Pack of 200)
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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. 121-9982
Mfr. Part No.FCX705TA
HK$2.239
Each (On a Reel of 1000)
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PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 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
RS Stock No. 922-7948
Mfr. Part No.FMMT634TA
HK$1.867
Each (On a Reel of 3000)
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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. 922-7627
Mfr. Part No.FZT600TA
HK$2.552
Each (On a Reel of 1000)
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NPN 2 A 140 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 160 V 1.2 V
RS Stock No. 121-9962
Mfr. Part No.FZT603TA
HK$2.35
Each (On a Reel of 1000)
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NPN 2 A 80 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.95 V 100 V 1.13 V
RS Stock No. 165-8351
Mfr. Part No.ULN2004AS16-13
HK$1.67
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 669-7486
Mfr. Part No.ZTX601
HK$6.712
Each (In a Pack of 5)
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NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 1000 1.9 V 180 V 1.2 V