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. 669-7584
Mfr. Part No.FMMT614TA
HK$2.724
Each (In a Pack of 25)
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. 823-3025
Mfr. Part No.MMBT6427-7-F
HK$0.629
Each (In a Pack of 100)
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. 922-7844
Mfr. Part No.FZT705TA
HK$2.969
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. 274-958
Mfr. Part No.FZT605TA
HK$6.22
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. 823-3043
Mfr. Part No.MMBTA63-7-F
HK$0.503
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. 121-9962
Mfr. Part No.FZT603TA
HK$2.411
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. 121-9985
Mfr. Part No.FMMT614TA
HK$1.199
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. 165-8351
Mfr. Part No.ULN2004AS16-13
HK$1.37
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. 751-4414
Mfr. Part No.FZT696BTA
HK$5.84
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. 823-1384
Mfr. Part No.FMMTA14TA
HK$2.411
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. 165-8604
Mfr. Part No.MMBTA63-7-F
HK$0.274
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. 922-7885
Mfr. Part No.ZTX601
HK$3.312
Each (In a Bag of 4000)
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. 122-2358
Mfr. Part No.FCX605TA
HK$2.127
Each (On a Reel of 1000)
units
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. 669-7568
Mfr. Part No.FCX705TA
HK$4.508
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. 122-2363
Mfr. Part No.FMMTA14TA
HK$0.985
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. 121-9417
Mfr. Part No.FMMT38CTA
HK$0.961
Each (On a Reel of 3000)
units
NPN 300 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 80 V 1.25 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. 822-2163
Mfr. Part No.BCV46TA
HK$2.793
Each (In a Pack of 20)
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. 823-1350
Mfr. Part No.FCX605TA
HK$4.508
Each (In a Pack of 25)
units
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. 922-7627
Mfr. Part No.FZT600TA
HK$2.552
Each (On a Reel of 1000)
units
NPN 2 A 140 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 160 V 1.2 V