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. 168-8603
Mfr. Part No.BU931T
$3.176
Each (In a Tube of 50)
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. 545-2333
Mfr. Part No.BD678AG
$1.016
Each (In a Pack of 5)
units
PNP 4 A 60 V 5 V TO-225 Through Hole 3 - Single 1 750 - 60 V 2.8 V
RS Stock No. 102-4094
Mfr. Part No.BDX53C
$0.668
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 829-4020
Mfr. Part No.BU931T
$4.205
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. 163-1231
Mfr. Part No.TIP140G
$2.225
Each (In a Tube of 30)
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. 145-5964
Mfr. Part No.DS2003TM/NOPB
$0.765
Each (In a Tube of 48)
units
NPN 500 mA 55 V 6 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 774-3669
Mfr. Part No.TIP140G
$2.915
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. 921-5181
Mfr. Part No.ULN2003AINE4
$0.786
Each (In a Tube of 25)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 877-2946
Mfr. Part No.STP03D200
$10.274
Each (In a Pack of 5)
units
NPN 100 mA 1200 V 20 V TO-220 Through Hole 3 - Single 1 230 @ 20 mA @ 10 V 2 V 2000 V 2 V
RS Stock No. 790-5407
Mfr. Part No.MJH6284G
$6.445
Each (In a Pack of 2)
units
NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 168-6057
Mfr. Part No.BD682
$0.976
Each (In a Tube of 50)
units
PNP 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 792-4694
Mfr. Part No.MJF122G
$1.408
Each (In a Pack of 5)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 3.5 V dc
RS Stock No. 774-3662
Mfr. Part No.TIP142G
$2.95
Each (In a Pack of 2)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 3.5 V 100 V 3 V
RS Stock No. 163-1232
Mfr. Part No.TIP142G
$2.124
Each (In a Tube of 30)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 3.5 V 100 V 3 V
RS Stock No. 922-7948
Mfr. Part No.FMMT634TA
$0.305
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. 121-8459
Mfr. Part No.ULN2004AN
$0.791
Each (In a Tube of 25)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 790-5375
Mfr. Part No.MJE5742G
$2.508
Each (In a Pack of 5)
units
NPN 8 A 400 V 8 V TO-220 Through Hole 3 - Single 1 50 3.5 V - 3 V
RS Stock No. 163-0840
Mfr. Part No.2N6052G
$6.376
Each (In a Tray of 100)
units
PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 652-825
Mfr. Part No.ULN2004AN
$1.21
Each
units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-9190
Mfr. Part No.ULN2003APW
$0.668
Each (In a Pack of 10)
units
NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
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