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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รายละเอียดสินค้า / Description ราคา / 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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THB111.265
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NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS Stock No. 680-7220
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THB73.99
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NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS Stock No. 714-1167
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THB36.69
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 168-6833
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THB18.525
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 103-1078
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THB8.353
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 100-3837
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THB19.028
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 109-084
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THB19.80
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NPN 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS Stock No. 168-6450
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THB7.52
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 686-8209
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THB13.565
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 774-3209
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THB433.75
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NPN 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS Stock No. 125-0063
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THB328.671
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NPN 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V
RS Stock No. 486-0294
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TIP142
THB49.528
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 102-4091
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TIP142
THB33.41
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 774-3653
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TIP120G
THB16.63
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 103-5146
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TIP120G
THB16.63
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NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 671-1125
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BCV27
THB4.555
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NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 665-8699
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ULN2003ADR
THB14.95
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 100-7565
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MJ11016G
THB131.535
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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. 166-1955
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THB1.094
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NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 463-000
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THB178.635
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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
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