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
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PNP 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
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NPN 500 mA 40 V 12 V SOT-23 Surface Mount 3 - Single 1 20000 2 V 40 V 1.5 V
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Mfr. Part No.FCX705TA
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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. 486-0014
Mfr. Part No.BD679A
SGD1.04
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NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 792-0914
Mfr. Part No.BST62,115
BrandNexperia
SGD0.778
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PNP -1 A 80 V -5 V SOT-89 Surface Mount 3 - Single 1 1000 -1.9 V -90 V -1.3 V
RS Stock No. 162-9598
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NPN 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 110-7773
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BrandInfineon
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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
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BrandNexperia
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PNP -1 A 80 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -90 V -1.3 V
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NPN 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 100 4.5 V 100 V 2 V
RS Stock No. 738-4936
Mfr. Part No.BST52TA
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NPN 500 mA 80 V 10 V SOT-89 Surface Mount 3 - Single 1 1000 1.9 V 90 V 1.3 V
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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
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NPN 1.5 A - 5 V MFP16FS Surface Mount 3 Dual - - - - - -
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NPN 25 (Continuous) A, 40 (Peak) A 100 V dc 5 V dc SOT-93 Through Hole 3 Single Single 1 15 - 100 V dc 4 V dc
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
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PNP 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
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BrandNexperia
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