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. 822-2163
Mfr. Part No.BCV46TA
€0.024
Each (In a Pack of 20)
units
PNP -500 mA 60 V -10 V SOT-23 Surface Mount 3 - Single 1 10000 -1.5 V -80 V -1 V
RS Stock No. 922-7762
Mfr. Part No.ZTX605
€0.43
Each (In a Bag of 4000)
units
NPN 1 A 120 V 10 V E-Line Through Hole 3 - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 655-593
Mfr. Part No.ZTX605
€0.914
Each (In a Pack of 5)
units
NPN 1 A 120 V 10 V E-Line Through Hole 3 - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 121-9472
Mfr. Part No.BCV49TA
€0.135
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. 669-7584
Mfr. Part No.FMMT614TA
€0.32
Each (In a Pack of 25)
units
NPN 500 mA 100 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 1.9 V 120 V 1 V
RS Stock No. 823-3043
Mfr. Part No.MMBTA63-7-F
€0.024
Each (In a Pack of 200)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 1 10000 -2 V -30 V -1.5 V
RS Stock No. 121-9528
Mfr. Part No.BCV47TA
€0.054
Each (On a Reel of 3000)
units
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 274-958
Mfr. Part No.FZT605TA
€0.692
Each (In a Pack of 5)
units
NPN 1.5 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 751-3531
Mfr. Part No.BCV47TA
€0.116
Each (In a Pack of 100)
units
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 274-964
Mfr. Part No.FZT705TC
€0.844
Each (In a Pack of 5)
units
PNP 2 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 669-7329
Mfr. Part No.FMMT38CTA
€0.306
Each (In a Pack of 25)
units
NPN 300 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 122-0251
Mfr. Part No.FZT696BTA
€0.364
Each (On a Reel of 1000)
units
NPN 500 mA 180 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 150 0.9 V 180 V 0.25 V
RS Stock No. 121-9982
Mfr. Part No.FCX705TA
€0.151
Each (On a Reel of 1000)
units
PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 669-7568
Mfr. Part No.FCX705TA
€0.154
Each (In a Pack of 10)
units
PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 751-3534
Mfr. Part No.BCX38C
€0.454
Each (In a Pack of 25)
units
NPN 800 mA 60 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 922-8159
Mfr. Part No.FMMT734TA
€0.198
Each (On a Reel of 3000)
units
PNP -800 mA 100 V - SOT-23 Surface Mount 3 - Single 1 5000 -1.75 V -100 V -0.75 V
RS Stock No. 922-7844
Mfr. Part No.FZT705TA
€0.358
Each (On a Reel of 1000)
units
PNP 2 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 122-0289
Mfr. Part No.BST52TA
€0.137
Each (On a Reel of 1000)
units
NPN 500 mA 80 V 10 V SOT-89 Surface Mount 3 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 121-9962
Mfr. Part No.FZT603TA
€0.293
Each (On a Reel of 1000)
units
NPN 2 A 80 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.95 V 100 V 1.13 V
RS Stock No. 122-2363
Mfr. Part No.FMMTA14TA
€0.077
Each (On a Reel of 3000)
units
NPN 300 mA 40 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 - 40 V 1 V