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. 166-2225
Mfr. Part No.MMBTA28
TWD3.00
Each (On a Reel of 3000)
units
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS Stock No. 807-4731
Mfr. Part No.MMBTA28
TWD10.00
Each (On a Tape of 50)
units
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS Stock No. 806-5046
Mfr. Part No.NJD35N04T4G
TWD26.00
Each (On a Tape of 25)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS Stock No. 145-2940
Mfr. Part No.NJD35N04G
TWD27.10
Each (In a Tube of 75)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 163-0785
Mfr. Part No.NJD35N04T4G
TWD13.70
Each (On a Reel of 2500)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS Stock No. 805-4412
Mfr. Part No.NJD35N04G
TWD25.60
Each (In a Pack of 25)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS Stock No. 163-0972
Mfr. Part No.MMBTA63LT1G
TWD1.10
Each (On a Reel of 3000)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 773-7743
Mfr. Part No.MC1413BDR2G
TWD16.50
Each (On a Tape of 10)
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NPN 500 mA 50 V 5 V SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 178-7560
Mfr. Part No.MC1413BDR2G
TWD6.30
Each (On a Reel of 2500)
units
- - - - - - - - - - - - - -
RS Stock No. 688-9408
Mfr. Part No.MC1413BDG
TWD19.80
Each (In a Pack of 5)
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NPN 500 mA 50 V 5 V SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 178-4725
Mfr. Part No.MC1413BDG
TWD6.90
Each (In a Tube of 48)
units
- - - - - - - - - - - - - -
RS Stock No. 781-4285
Mfr. Part No.MMBTA63LT1G
TWD2.00
Each (In a Pack of 100)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 125-0063
Mfr. Part No.MJ11032G
TWD334.90
Each (In a Tray of 100)
units
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. 166-1813
Mfr. Part No.MMBTA13
TWD1.00
Each (On a Reel of 3000)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 163-1230
Mfr. Part No.TIP122G
TWD21.90
Each (In a Tube of 50)
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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. 774-3209
Mfr. Part No.MJ11032G
TWD477.00
Each
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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. 671-1153
Mfr. Part No.MMBTA13
TWD6.10
Each (In a Pack of 20)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 30 V 1.5 V
RS Stock No. 178-7612
Mfr. Part No.MMBTA13LT1G
TWD1.10
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 781-4288
Mfr. Part No.MMBTA13LT3G
TWD2.60
Each (On a Tape of 100)
units
NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 1.5 V 30 V 1.5 V
RS Stock No. 178-4695
Mfr. Part No.MMBTA13LT3G
TWD0.90
Each (On a Reel of 10000)
units
- - - - - - - - - - - - - -