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. 751-3531
Mfr. Part No.BCV47TA
R 0.375
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. 121-9528
Mfr. Part No.BCV47TA
R 0.364
Each (On a Reel of 3000)
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. 922-7844
Mfr. Part No.FZT705TA
R 5.40
Each (On a Reel of 1000)
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. 669-7304
Mfr. Part No.FZT705TA
R 9.923
Each (In a Pack of 10)
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. 274-964
Mfr. Part No.FZT705TC
R 4.004
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. 922-7712
Mfr. Part No.FZT705TC
R 3.86
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. 165-8351
Mfr. Part No.ULN2004AS16-13
R 2.313
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS stock no. 274-958
Mfr. Part No.FZT605TA
R 2.034
Each (In a Pack of 5)
units
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
RS stock no. 922-7718
Mfr. Part No.FZT605TA
R 1.707
Each (On a Reel of 1000)
units
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
RS stock no. 669-7394
Mfr. Part No.FZT603TA
R 8.085
Each (In a Pack of 10)
units
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. 121-9962
Mfr. Part No.FZT603TA
R 4.177
Each (On a Reel of 1000)
units
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. 921-0824
Mfr. Part No.ULN2004AS16-13
R 5.757
Each (In a Pack of 30)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS stock no. 922-8392
Mfr. Part No.FZT7053TA
R 3.112
Each (On a Reel of 1000)
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. 122-0678
Mfr. Part No.ZXTP05120HFFTA
R 2.737
Each (On a Reel of 3000)
units
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. 823-1384
Mfr. Part No.FMMTA14TA
R 1.47
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. 751-4418
Mfr. Part No.FZT7053TA
R 3.026
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. 655-593
Mfr. Part No.ZTX605
R 11.746
Each (In a Pack of 5)
units
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. 712-2882
Mfr. Part No.ZXTP05120HFFTA
R 6.816
Each (In a Pack of 10)
units
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. 122-2363
Mfr. Part No.FMMTA14TA
R 1.432
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. 922-7762
Mfr. Part No.ZTX605
R 6.163
Each (In a Bag of 4000)
units
NPN 1 A 120 V 10 V E-Line Through Hole 3 - Single 1 500 1.8 V 140 V 1.5 V