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. 168-6833
Mfr. Part No.ULN2803A
MYR4.21
Each (In a Tube of 20)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 714-1167
Mfr. Part No.ULN2803A
MYR5.008
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
MYR6.484
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 866-0196
Mfr. Part No.ULN2803ADW
MYR5.347
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 102-4091
Mfr. Part No.TIP142
MYR6.735
Each (In a Tube of 30)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 486-0294
Mfr. Part No.TIP142
MYR7.958
Each (In a Pack of 5)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 686-8209
Mfr. Part No.ULN2003A
MYR1.71
Each (In a Pack of 20)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
MYR1.727
Each (In a Tube of 25)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 122-0139
Mfr. Part No.MJ11033G
MYR50.467
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. 485-9660
Mfr. Part No.TIP121
MYR2.052
Each (In a Pack of 5)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 102-4100
Mfr. Part No.TIP121
MYR1.744
Each (In a Tube of 50)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 774-3202
Mfr. Part No.MJ11033G
MYR69.73
Each
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. 485-9086
Mfr. Part No.BDX53C
MYR3.40
Each (In a Pack of 5)
units
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. 917-3374
Mfr. Part No.ULN2801A
MYR3.292
Each (In a Pack of 10)
units
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 102-4094
Mfr. Part No.BDX53C
MYR3.625
Each (In a Tube of 50)
units
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. 168-6084
Mfr. Part No.BU941ZPFI
MYR11.696
Each (In a Tube of 30)
units
NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 168-8977
Mfr. Part No.ULN2801A
MYR3.292
Each (In a Tube of 20)
units
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 419-1144
Mfr. Part No.BU941ZPFI
MYR13.46
Each
units
NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS Stock No. 527-883
Mfr. Part No.SN75468N
MYR3.27
Each (In a Tube of 25)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - -
RS Stock No. 865-2097
Mfr. Part No.BCV27,215
BrandNexperia
MYR0.384
Each (In a Pack of 100)
units
NPN 500 mA 30 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 4000 1.5 V 40 V 1 V