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. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
SGD0.104
Each (In a Pack of 50)
units
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 124-5325
Mfr. Part No.MJH11022G
SGD4.40
Each (In a Tube of 30)
units
NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 166-0475
Mfr. Part No.BSP50,115
BrandNexperia
SGD0.372
Each (On a Reel of 1000)
units
NPN 800 mA 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 484-2707
Mfr. Part No.BST52,115
BrandNexperia
SGD0.804
Each (In a Pack of 5)
units
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 484-5251
Mfr. Part No.BSP50,115
BrandNexperia
SGD0.791
Each (In a Pack of 10)
units
NPN 1 A 45 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 463-000
Mfr. Part No.MJ11016G
SGD13.535
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. 485-9660
Mfr. Part No.TIP121
SGD1.458
Each (In a Pack of 5)
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NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 163-2366
Mfr. Part No.BDW42G
SGD0.98
Each (In a Tube of 50)
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NPN 15 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 250 - 100 V 3 V
RS Stock No. 122-0071
Mfr. Part No.MJ11016G
SGD9.671
Each (In a Tray of 100)
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 100-7565
Mfr. Part No.MJ11016G
SGD9.671
Each (In a Tray of 100)
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NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 102-4098
Mfr. Part No.BD677
SGD0.521
Each (In a Tube of 50)
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NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 686-8146
Mfr. Part No.MJD117T4
SGD0.82
Each (In a Pack of 20)
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. 166-1532
Mfr. Part No.BST52,115
BrandNexperia
SGD0.404
Each (On a Reel of 1000)
units
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 163-2498
Mfr. Part No.MJD31CT4G
SGD0.24
Each (On a Reel of 2500)
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NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 - - 100 V -
RS Stock No. 144-9908
Mfr. Part No.ULN2002AN
SGD1.392
Each (In a Tube of 25)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 110-7440
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
SGD0.273
Each (In a Pack of 100)
units
PNP 1 A 60 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS Stock No. 168-8907
Mfr. Part No.ULQ2003A
SGD0.833
Each (In a Tube of 25)
units
NPN 500 mA 50 V 30 V PDIP Through Hole 16 - Common Emitter 7 1000 @ 350 mA @ 2 V - 30 V 1.6 V
RS Stock No. 908-7031
Mfr. Part No.OP830SL
BrandOptek
SGD4.35
Each
units
- - - - TO-18 Through Hole - - - - - - - -
RS Stock No. 168-6054
Mfr. Part No.TIP125
SGD0.76
Each (In a Tube of 50)
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PNP 5 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 633-666
Mfr. Part No.ULN2065B
SGD4.69
Each
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NPN 1.75 A 80 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.5 V