Darlington Pairs

Darlington pairs, also known as Darlington Transistors are discrete semiconductor devices consisting of a package of two standard BJT transistors (bipolar junction transistor). One of the transistors is high-gain while the other is high current. RS Components offer a wide range of high-quality Darlington Transistors from leading brands including ON Semiconductor, STMicroelectronics, Texas Instruments and Nexperia.

How do they work?

The emitter of one transistor is connected to the base of the other transistor which effectively creates one transistor. 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 microcontroller 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.

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 (PCB) printed circuit board.

What applications would 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.

What are the different types?

  • Darlington 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. 714-1164
Mfr. Part No.ULN2802A
MYR4.726
Each (In a Pack of 5)
units
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.1 V
RS Stock No. 485-9058
Mfr. Part No.BDW94C
MYR3.744
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. 100-7580
Mfr. Part No.MJD127G
MYR2.635
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. 686-8142
Mfr. Part No.MJD127T4
MYR2.247
Each (In a Pack of 20)
units
PNP 5 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 163-2365
Mfr. Part No.BD679AG
MYR1.60
Each (In a Box of 500)
units
NPN 4 A 80 V 5 V TO-225 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 168-6439
Mfr. Part No.TIP105
MYR3.131
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. 862-4954
Mfr. Part No.MJ11012G
MYR32.14
Each (In a Pack of 2)
units
NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 486-0014
Mfr. Part No.BD679A
MYR3.066
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. 121-6413
Mfr. Part No.MJD112G
MYR2.14
Each (In a Tube of 75)
units
NPN 2 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 774-3423
Mfr. Part No.2N6038G
MYR3.718
Each (In a Pack of 5)
units
NPN 4 A 60 V 5 V TO-225AA Through Hole 3 - Single 1 100 4 V 60 V 3 V
RS Stock No. 168-6442
Mfr. Part No.ULN2001D1013TR
MYR0.765
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
MYR17.985
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. 790-5328
Mfr. Part No.MJD117G
MYR2.12
Each (In a Pack of 15)
units
PNP 2 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 177-5536
Mfr. Part No.A2982SLWTR-T
MYR12.947
Each (On a Reel of 1000)
units
NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS Stock No. 163-0033
Mfr. Part No.MJ11012G
MYR21.19
Each (In a Tray of 100)
units
NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 102-4104
Mfr. Part No.TIP147
MYR5.303
Each (In a Tube of 30)
units
PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 145-3529
Mfr. Part No.2N6038G
MYR1.859
Each (In a Box of 500)
units
NPN 4 A 60 V 5 V TO-225AA Through Hole 3 - Single 1 100 4 V 60 V 3 V
RS Stock No. 121-6417
Mfr. Part No.MJH11021G
MYR14.711
Each (In a Tube of 30)
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. 463-016
Mfr. Part No.MJD112T4G
MYR2.394
Each (In a Pack of 20)
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. 122-0677
Mfr. Part No.ZXTN04120HFFTA
MYR1.037
Each (On a Reel of 3000)
units
NPN 1 A 120 V 10 V SOT-23F Surface Mount 3 - Single 2 1000 1.7 V 140 V 1.5 V