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. 100-3837
Mfr. Part No.ULN2003AN
PHP246.87
Each (In a Tube of 25)
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 436-8451
Mfr. Part No.ULN2003AN
PHP252.63
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 866-0196
Mfr. Part No.ULN2803ADW
PHP78.555
Each (In a Tube of 40)
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NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
PHP79.748
Each (In a Pack of 5)
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NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 922-2987
Mfr. Part No.ULN2003ADR
PHP11.641
Each (On a Reel of 2500)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8478
Mfr. Part No.ULN2003AD
PHP23.083
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 858-196
Mfr. Part No.ULN2003AD
PHP37.10
Each
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NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 144-9908
Mfr. Part No.ULN2002AN
PHP49.074
Each (In a Tube of 25)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 527-883
Mfr. Part No.SN75468N
PHP42.294
Each (In a Tube of 25)
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NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - -
RS Stock No. 652-825
Mfr. Part No.ULN2004AN
PHP32.93
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.ULN2003AIN
PHP110.104
Each (In a Pack of 5)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 121-8459
Mfr. Part No.ULN2004AN
PHP28.56
Each (In a Tube of 25)
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NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 921-5181
Mfr. Part No.ULN2003AIN
PHP103.824
Each (In a Tube of 25)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 858-203
Mfr. Part No.ULN2004AD
PHP43.72
Each
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 197-7631
Mfr. Part No.ULN2003ADR
PHP13.05
Each (On a Reel of 2500)
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NPN - 50 V - SOIC - 16 - - 7 - - - -
RS Stock No. 162-6795
Mfr. Part No.ULN2003LVDR
PHP15.385
Each (On a Reel of 2500)
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NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS Stock No. 517-0766
Mfr. Part No.SN75468D
PHP46.306
Each (In a Pack of 5)
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NPN 500 mA 100 V - SOIC Surface Mount 16 - Common Emitter 7 - - - -
RS Stock No. 162-6796
Mfr. Part No.ULN2003V12DR
PHP11.915
Each (On a Reel of 2500)
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NPN 140 mA 20 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.75 V
RS Stock No. 197-7634
Mfr. Part No.ULN2003AIPWR
PHP911.914
Each (In a Pack of 25)
units
NPN - 50 V - TSSOP - 16 - - 1 - - - -
RS Stock No. 162-7586
Mfr. Part No.ULN2004AID
PHP31.192
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V