Darlington Pairs

What are Darlington Pairs?

Darlington pairs, also called Darlington transistors, are a package of two standard BJT transistors (bipolar junction transistor). One of the transistors is high-gain while the other is high current. 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 micro controller 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.

How do they work?

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

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 board.

What applications do 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.

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. 445-2095
Mfr. Part No.BCV47E6327HTSA1
BrandInfineon
PHP12.108
Each (In a Pack of 25)
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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. 752-8079
Mfr. Part No.BCV61BE6327HTSA1
BrandInfineon
PHP5.399
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. 827-0008
Mfr. Part No.BCV26E6327HTSA1
BrandInfineon
PHP2.566
Each (On a Reel of 500)
units
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS Stock No. 752-8205
Mfr. Part No.BSP60H6327XTSA1
BrandInfineon
PHP13.382
Each (In a Pack of 10)
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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. 752-8202
Mfr. Part No.BSP50H6327XTSA1
BrandInfineon
PHP10.098
Each (In a Pack of 10)
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NPN 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. 110-7440
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
PHP9.383
Each (In a Pack of 100)
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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
PHP7.838
Each (On a Reel of 1000)
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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. 178-7473
Mfr. Part No.BCV26E6327HTSA1
BrandInfineon
PHP2.449
Each (On a Reel of 3000)
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PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS Stock No. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
PHP2.765
Each (In a Pack of 50)
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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. 145-9578
Mfr. Part No.BSP61H6327XTSA1
BrandInfineon
PHP5.985
Each (On a Reel of 1000)
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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. 110-7773
Mfr. Part No.BCV49H6327XTSA1
BrandInfineon
PHP8.734
Each (In a Pack of 100)
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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. 911-4754
Mfr. Part No.BCV47E6327HTSA1
BrandInfineon
PHP1.606
Each (On a Reel of 3000)
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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
PHP6.752
Each (On a Reel of 1000)
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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. 165-7709
Mfr. Part No.BCV61BE6327HTSA1
BrandInfineon
PHP3.381
Each (On a Reel of 3000)
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NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV