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
RS Stock No. 122-0071
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THB161.813
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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. 463-000
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THB221.53
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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. 922-2987
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THB6.577
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 671-1125
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THB6.331
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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. 858-196
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THB18.31
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 485-9086
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BDX53C
THB32.12
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
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NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 102-4094
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THB27.03
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NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 168-6448
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THB13.138
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 102-4092
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THB20.757
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NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 714-2687
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THB27.44
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NPN 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 102-4090
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BDX33C
THB27.03
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NPN 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 122-0139
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MJ11033G
THB380.378
Each (In a Tray of 100)
Units
PNP 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. 774-3202
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MJ11033G
THB497.23
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PNP 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. 923-6661
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ULN2003AID
THB16.432
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 646-6311
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ULN2803ADW
THB47.196
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NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 866-0196
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THB39.22
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NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 665-9197
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ULN2003AID
THB16.432
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Units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 485-9058
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THB27.98
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Units
PNP 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
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