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. 911-4754
Mfr. Part No.BCV47E6327HTSA1
BrandInfineon
$0.163
Each (On a Reel of 3000)
units
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 Single Single 1 2000 1.5 V - 1 V
RS Stock No. 166-0976
Mfr. Part No.BCV49H6327XTSA1
BrandInfineon
$0.232
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. 110-7440
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
$0.283
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. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
$0.116
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. 110-7773
Mfr. Part No.BCV49H6327XTSA1
BrandInfineon
$0.312
Each (In a Pack of 100)
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. 445-2095
Mfr. Part No.BCV47E6327HTSA1
BrandInfineon
$0.63
Each (In a Pack of 25)
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. 145-9578
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
$0.187
Each (On a Reel of 1000)
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. 165-7512
Mfr. Part No.BSP60H6327XTSA1
BrandInfineon
$0.478
Each (On a Reel of 1000)
units
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS Stock No. 752-8079
Mfr. Part No.BCV61BE6327HTSA1
BrandInfineon
$0.181
Each (On a Tape of 25)
units
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV
RS Stock No. 752-8205
Mfr. Part No.BSP60H6327XTSA1
BrandInfineon
$0.525
Each (In a Pack of 10)
units
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS Stock No. 165-7709
Mfr. Part No.BCV61BE6327HTSA1
BrandInfineon
$0.106
Each (On a Reel of 3000)
units
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV