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. 168-7231
Mfr. Part No.BDW94CFP
HK$11.574
Each (In a Tube of 50)
units
PNP 12 A 100 V - TO-220FP Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 100-7580
Mfr. Part No.MJD127G
HK$5.086
Each (In a Tube of 75)
units
PNP 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 545-0242
Mfr. Part No.MJD31CG
HK$4.16
Each
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS Stock No. 103-2945
Mfr. Part No.BU323ZG
HK$20.129
Each (In a Tube of 30)
units
NPN 10 A 350 V 6 V TO-247 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS Stock No. 166-2822
Mfr. Part No.PZTA14
HK$1.156
Each (On a Reel of 4000)
units
NPN 1.2 A 30 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 2 V 30 V 1.5 V
RS Stock No. 186-8214
Mfr. Part No.TIP126G
HK$5.302
Each (In a Pack of 25)
units
PNP 5 A dc 80 V dc 5 V dc TO-220 Through Hole 3 Single Single 1 1000 - 80 V dc 4 V dc
RS Stock No. 166-1812
Mfr. Part No.BCV26
HK$0.403
Each (On a Reel of 3000)
units
PNP 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 168-7874
Mfr. Part No.ST901T
HK$8.163
Each (In a Tube of 50)
units
NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS Stock No. 774-3209
Mfr. Part No.MJ11032G
HK$114.39
Each
units
NPN 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS Stock No. 922-8392
Mfr. Part No.FZT7053TA
HK$2.13
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. 168-5782
Mfr. Part No.BDX34C
BrandMagnatec
HK$3.891
Each (In a Tube of 50)
units
PNP 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 102-4093
Mfr. Part No.BD681
HK$6.184
Each (In a Tube of 50)
units
NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 180-7427
Mfr. Part No.TCMD4000
BrandVishay
HK$7.37
Each (On a Reel of 2000)
units
- - - - - - - - - - - - - -
RS Stock No. 633-666
Mfr. Part No.ULN2065B
HK$23.64
Each
units
NPN 1.75 A 80 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.5 V
RS Stock No. 903-4103
Mfr. Part No.BC516_D27Z
HK$1.369
Each (In a Pack of 100)
units
PNP -1 A 30 V -10 V TO-92 Through Hole 3 - Single 1 30000 - -40 V -1 V
RS Stock No. 531-9848
Mfr. Part No.2SD1509(Q)
BrandToshiba
HK$3.63
Each (In a Pack of 5)
units
NPN 2 A 80 V 8 V PW Mold Through Hole 3 - - 1 2000 2 V 80 V 1.5 V
RS Stock No. 168-6439
Mfr. Part No.TIP105
HK$6.184
Each (In a Tube of 50)
units
PNP 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 200 - 60 V 2.5 V
RS Stock No. 186-7944
Mfr. Part No.BD677AG
HK$4.804
Each (In a Pack of 25)
units
NPN 4 A dc 60 V dc 5 V dc TO-225 Through Hole 3 Single Single 1 750 - 60 V dc 2.8 V dc
RS Stock No. 178-7473
Mfr. Part No.BCV26E6327HTSA1
BrandInfineon
HK$0.462
Each (On a Reel of 3000)
units
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS Stock No. 669-7486
Mfr. Part No.ZTX601
HK$7.212
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
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