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. 714-2690
Mfr. Part No.BDX54C
$0.875
Each (In a Pack of 10)
units
PNP 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 121-9472
Mfr. Part No.BCV49TA
$0.227
Each (On a Reel of 1000)
units
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 802-1468
Mfr. Part No.BD679ASTU
$0.827
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. 186-8205
Mfr. Part No.TIP121G
$0.778
Each (In a Pack of 25)
units
NPN 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. 165-7772
Mfr. Part No.ULN2004D1013TR
$0.222
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 790-5393
Mfr. Part No.MJH11021G
$6.655
Each (In a Pack of 2)
units
PNP 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 168-8977
Mfr. Part No.ULN2801A
$1.009
Each (In a Tube of 20)
units
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 178-4776
Mfr. Part No.TIP111G
$0.854
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 486-0014
Mfr. Part No.BD679A
$1.156
Each (In a Pack of 5)
units
NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 168-6176
Mfr. Part No.BD679A
$0.976
Each (In a Tube of 50)
units
NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 166-2822
Mfr. Part No.PZTA14
$0.199
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. 163-2498
Mfr. Part No.MJD31CT4G
$0.34
Each (On a Reel of 2500)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS Stock No. 166-2821
Mfr. Part No.PZTA64
$0.176
Each (On a Reel of 4000)
units
PNP -1.2 A 30 V -10 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 -2 V -30 V -1.5 V
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