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. 922-2987
Mfr. Part No.ULN2003ADR
$0.34
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 251-3299
Mfr. Part No.TIP125
$1.01
Each
units
PNP 5 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 463-000
Mfr. Part No.MJ11016G
$12.155
Each (In a Pack of 2)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 803-1973
Mfr. Part No.MMBTA14
$0.108
Each (In a Pack of 100)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 30 V 1.5 V
RS Stock No. 166-1922
Mfr. Part No.MMBTA14
$0.059
Each (On a Reel of 3000)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 30 V 1.5 V
RS Stock No. 168-6833
Mfr. Part No.ULN2803A
$1.716
Each (In a Tube of 20)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 100-7565
Mfr. Part No.MJ11016G
$8.305
Each (In a Tray of 100)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 714-1167
Mfr. Part No.ULN2803A
$2.002
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 166-2727
Mfr. Part No.KSP13BU
$0.068
Each (In a Bag of 10000)
units
NPN 500 mA 30 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 665-8699
Mfr. Part No.ULN2003ADR
$0.811
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 102-4089
Mfr. Part No.TIP142T
$1.511
Each (In a Tube of 50)
units
NPN 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
$0.942
Each (In a Tube of 40)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 485-9058
Mfr. Part No.BDW94C
$1.486
Each (In a Pack of 5)
units
PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 485-8673
Mfr. Part No.TIP147T
$2.574
Each (In a Pack of 5)
units
PNP 10 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 103-5146
Mfr. Part No.TIP120G
$0.88
Each (In a Tube of 50)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 486-0294
Mfr. Part No.TIP142
$3.156
Each (In a Pack of 5)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
$2.542
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 163-0785
Mfr. Part No.NJD35N04T4G
$0.618
Each (On a Reel of 2500)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS Stock No. 485-9042
Mfr. Part No.BDW93C
$1.644
Each (In a Pack of 5)
units
NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
$1.00
Each
units
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
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