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. 923-6661
Mfr. Part No.ULN2003AID
HK$3.831
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-9197
Mfr. Part No.ULN2003AID
HK$5.215
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 921-5181
Mfr. Part No.ULN2003AIN
HK$4.851
Each (In a Tube of 25)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 436-8451
Mfr. Part No.ULN2003AN
HK$5.48
Each
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 732-0887
Mfr. Part No.ULN2003AINE4
HK$5.838
Each (In a Pack of 5)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 100-3837
Mfr. Part No.ULN2003AN
HK$4.515
Each (In a Tube of 25)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 922-2987
Mfr. Part No.ULN2003ADR
HK$1.775
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 858-196
Mfr. Part No.ULN2003AD
HK$4.67
Each
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
HK$4.017
Each (In a Tube of 40)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 809-5475
Mfr. Part No.ULN2003LVDR
HK$13.70
Each
units
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 665-8696
Mfr. Part No.ULQ2003ADR
HK$4.641
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 162-7587
Mfr. Part No.ULQ2003ADR
HK$1.988
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-9204
Mfr. Part No.ULQ2003AD
HK$5.481
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 665-9190
Mfr. Part No.ULN2003APW
HK$4.843
Each (In a Pack of 10)
units
NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 145-0190
Mfr. Part No.ULN2003APW
HK$4.549
Each (In a Tube of 90)
units
NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 145-0726
Mfr. Part No.ULQ2003AD
HK$4.775
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 162-6795
Mfr. Part No.ULN2003LVDR
HK$2.547
Each (On a Reel of 2500)
units
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 709-2879
Mfr. Part No.SN75469NE4
HK$8.698
Each (In a Pack of 5)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 527-883
Mfr. Part No.SN75468N
HK$7.382
Each (In a Tube of 25)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - -
RS Stock No. 197-7632
Mfr. Part No.ULN2003ADR
HK$3.698
Each (In a Pack of 25)
units
NPN - 50 V - SOIC - 16 - - 7 - - - -