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. 774-3666
Mfr. Part No.TIP147G
HK$15.77
Each (In a Pack of 2)
units
PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 3.5 V 100 V 3 V
RS Stock No. 145-2795
Mfr. Part No.MJD31CG
HK$2.205
Each (In a Tube of 75)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS Stock No. 686-8199
Mfr. Part No.ULN2804A
HK$7.76
Each (In a Pack of 10)
units
NPN 0.5 A 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 163-2497
Mfr. Part No.MJD117T4G
HK$2.156
Each (On a Reel of 2500)
units
PNP 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
RS Stock No. 485-9654
Mfr. Part No.TIP115
HK$6.536
Each (In a Pack of 5)
units
PNP 2 A 60 V 5 V TO-220 Through Hole 3 - Single 1 500 - 60 V 2.5 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. 802-1468
Mfr. Part No.BD679ASTU
HK$4.537
Each (In a Tube of 60)
units
NPN 4 A 80 V 5 V TO-126 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 168-5844
Mfr. Part No.ULN2074B
HK$19.62
Each (In a Tube of 25)
units
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 186-8195
Mfr. Part No.TIP110G
HK$4.794
Each (In a Pack of 25)
units
NPN 5 A dc 60 V dc 5 V dc TO-220 Through Hole 3 Single Single 1 500 - 60 V dc 2.5 V dc
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. 829-4020
Mfr. Part No.BU931T
HK$22.305
Each (In a Pack of 2)
units
NPN 10 A 400 V 5 V TO-220 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS Stock No. 826-8434
Mfr. Part No.2SD1383KT146B
BrandROHM
HK$2.629
Each (In a Pack of 30)
units
NPN 300 mA 32 V 6 V SMT Surface Mount 3 - Single 1 5000 - 40 V 1.5 V
RS Stock No. 545-0078
Mfr. Part No.BD675G
HK$4.96
Each
units
NPN 4 A 45 V 5 V TO-225 Through Hole 3 - Single 1 750 - 45 V 2.5 V
RS Stock No. 816-7811
Mfr. Part No.BST60
BrandNexperia
HK$2.838
Each (In a Pack of 10)
units
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS Stock No. 484-2634
Mfr. Part No.BSP52,115
BrandNexperia
HK$4.038
Each (In a Pack of 10)
units
NPN 1 A 80 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 774-3669
Mfr. Part No.TIP140G
HK$16.34
Each (In a Pack of 2)
units
NPN 10 A 60 V 5 V TO-247 Through Hole 3 - Single 1 500 3.5 V 60 V 3 V
RS Stock No. 787-8594
Mfr. Part No.ULQ2003ADR2G
HK$3.57
Each (On a Tape of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 125-0070
Mfr. Part No.MJD112T4G
HK$1.766
Each (On a Reel of 2500)
units
NPN 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
RS Stock No. 145-2940
Mfr. Part No.NJD35N04G
HK$6.468
Each (In a Tube of 75)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
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