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 typesDarlington 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. 922-7948
Mfr. Part No.FMMT634TA
$0.314
Each (On a Reel of 3000)
units
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. 669-7638
Mfr. Part No.FMMT634TA
$0.934
Each (In a Pack of 5)
units
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. 751-4418
Mfr. Part No.FZT7053TA
$0.859
Each (In a Pack of 10)
units
NPN 1.5 A 100 V 12 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 - 100 V 1.5 V
RS Stock No. 751-3531
Mfr. Part No.BCV47TA
$0.133
Each (In a Pack of 100)
units
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. 823-3043
Mfr. Part No.MMBTA63-7-F
$0.102
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. 121-9472
Mfr. Part No.BCV49TA
$0.229
Each (On a Reel of 1000)
units
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. 922-7712
Mfr. Part No.FZT705TC
$0.601
Each (On a Reel of 4000)
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. 121-9985
Mfr. Part No.FMMT614TA
$0.218
Each (On a Reel of 3000)
units
NPN 500 mA 100 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 1.9 V 120 V 1 V
RS Stock No. 751-4414
Mfr. Part No.FZT696BTA
$1.154
Each (On a Tape of 10)
units
NPN 500 mA 180 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 150 0.9 V 180 V 0.25 V
RS Stock No. 122-2363
Mfr. Part No.FMMTA14TA
$0.197
Each (On a Reel of 3000)
units
NPN 300 mA 40 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 40 V 1 V
RS Stock No. 823-1401
Mfr. Part No.FZT600BTA
$0.947
Each (In a Pack of 10)
units
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. 712-2873
Mfr. Part No.ZXTN04120HFFTA
$0.798
Each (In a Pack of 10)
units
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. 669-7486
Mfr. Part No.ZTX601
$1.454
Each (In a Pack of 5)
units
NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 1000 1.9 V 180 V 1.2 V
RS Stock No. 122-0251
Mfr. Part No.FZT696BTA
$0.597
Each (On a Reel of 1000)
units
NPN 500 mA 180 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 150 0.9 V 180 V 0.25 V
RS Stock No. 669-7568
Mfr. Part No.FCX705TA
$0.912
Each (In a Pack of 10)
units
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. 751-3534
Mfr. Part No.BCX38C
$0.714
Each (In a Pack of 25)
units
NPN 800 mA 60 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 165-8529
Mfr. Part No.MMBT6427-7-F
$0.068
Each (On a Reel of 3000)
units
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. 922-8159
Mfr. Part No.FMMT734TA
$0.314
Each (On a Reel of 3000)
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. 165-8604
Mfr. Part No.MMBTA63-7-F
$0.054
Each (On a Reel of 3000)
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. 121-9982
Mfr. Part No.FCX705TA
$0.431
Each (On a Reel of 1000)
units
PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 V