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. 121-8479
Mfr. Part No.ULN2004AD
MYR2.157
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 169-8764
Mfr. Part No.TIP121TU
MYR2.356
Each (In a Tube of 50)
units
NPN 8 A 80 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 80 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. 463-117
Mfr. Part No.BSP52T1G
MYR1.15
Each (In a Pack of 25)
units
NPN 1 A 80 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 145-3571
Mfr. Part No.MJD117G
MYR2.12
Each (In a Tube of 75)
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. 688-1505
Mfr. Part No.MJD117T4G
MYR2.45
Each (In a Pack of 2)
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. 165-7481
Mfr. Part No.MJD127T4
MYR0.96
Each (On a Reel of 2500)
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. 178-7525
Mfr. Part No.BSP52T1G
MYR0.462
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 712-2873
Mfr. Part No.ZXTN04120HFFTA
MYR1.999
Each (In a Pack of 10)
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NPN 1 A 120 V 10 V SOT-23F Surface Mount 3 - Single 2 1000 1.7 V 140 V 1.5 V
RS Stock No. 168-7874
Mfr. Part No.ST901T
MYR4.515
Each (In a Tube of 50)
units
NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS Stock No. 145-3529
Mfr. Part No.2N6038G
MYR1.859
Each (In a Box of 500)
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NPN 4 A 60 V 5 V TO-225AA Through Hole 3 - Single 1 100 4 V 60 V 3 V
RS Stock No. 121-8459
Mfr. Part No.ULN2004AN
MYR2.426
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. 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. 923-6661
Mfr. Part No.ULN2003AID
MYR2.478
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 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
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Mfr. Part No.TIP147
MYR5.303
Each (In a Tube of 30)
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PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 680-7220
Mfr. Part No.A2982SLWTR-T
MYR10.48
Each (In a Pack of 5)
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NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 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. 102-4103
Mfr. Part No.BDW94C
MYR3.224
Each (In a Tube of 50)
units
PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 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