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).

...
Read more Read less

Filters

Viewing 1 - 20 of 478 products
Results per page
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. 686-8209
Mfr. Part No.ULN2003A
HK$3.616
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
HK$2.512
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. 486-0294
Mfr. Part No.TIP142
HK$13.468
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. 102-4091
Mfr. Part No.TIP142
HK$13.006
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. 714-1167
Mfr. Part No.ULN2803A
HK$10.486
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. 919-6472
Mfr. Part No.ULN2003D1013TR
HK$1.264
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 790-5407
Mfr. Part No.MJH6284G
HK$32.77
Each (In a Pack of 2)
units
NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 774-3202
Mfr. Part No.MJ11033G
HK$89.57
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. 121-9878
Mfr. Part No.MJH6284G
HK$26.42
Each (In a Tube of 30)
units
NPN 20 A 100 V 5 V TO-247 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS Stock No. 426-229
Mfr. Part No.ULN2003D1013TR
HK$2.65
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 168-6832
Mfr. Part No.ULN2802A
HK$8.137
Each (In a Tube of 20)
units
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.1 V
RS Stock No. 313-3197
Mfr. Part No.BU931P
HK$25.94
Each
units
NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS Stock No. 122-0139
Mfr. Part No.MJ11033G
HK$106.914
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. 168-6833
Mfr. Part No.ULN2803A
HK$4.272
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. 714-1164
Mfr. Part No.ULN2802A
HK$9.61
Each (In a Pack of 5)
units
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.1 V
RS Stock No. 102-4097
Mfr. Part No.BU931P
HK$22.031
Each (In a Tube of 30)
units
NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS Stock No. 862-4954
Mfr. Part No.MJ11012G
HK$59.21
Each (In a Pack of 2)
units
NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 163-0033
Mfr. Part No.MJ11012G
HK$44.33
Each (In a Tray of 100)
units
NPN 30 A 60 V 5 V TO-204AA Through Hole 2 - Single 2 200 5 V 60 V 4 V
RS Stock No. 923-6661
Mfr. Part No.ULN2003AID
HK$4.256
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$4.256
Each (In a Pack of 10)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
Related Products
Suitable for main690V nominal voltageIngress protection IP55Full compliance ...
Description:
Suitable for main690V nominal voltageIngress protection IP55Full compliance with BS/EN 60947-3"Padlockable off" handle assembly (3 padlocks up to 8mm dia shank)Supplied with a 3-pole switch body, terminal shroud, extension shaft door interlock and operation assembly (red/yellow emergency switch)Supplied as ...
All have a nominal voltage of 690V. The ...
Description:
All have a nominal voltage of 690V. The stated motor rating utilisation category AC23A/AC3 is for 3 phase 380/440V supply. Padlockable (x4) in "OFF" positionInterlocked in "ON" position to prevent panel door being opened while switch is "ON"
Switch disconnectors are used to isolate electrical equipment ...
Description:
Switch disconnectors are used to isolate electrical equipment before any essential maintenance or repair work can be completed. Switch disconnectors ensure electrical circuits are de-energized safely in accordance with the electricity at work regulations. Engineers and electricians are then able ...
Totally insulated enclosures to IP65Black thumb grip and ...
Description:
Totally insulated enclosures to IP65Black thumb grip and grey front plate, emergency stop versions have a red thumb grip and yellow front plateSurface mounting.