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. 756-0310
Mfr. Part No.2SD1223(TE16L1,NQ)
BrandToshiba
MYR5.166
Each (In a Pack of 5)
units
NPN 4 A 80 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 100 V 1.5 V
RS Stock No. 145-5290
Mfr. Part No.MJ11021G
MYR24.727
Each (In a Tray of 100)
units
PNP -30 A 250 V -50 V TO-204 Through Hole 2 - Single 2 100 -3.8 V -250 V -3.4 V
RS Stock No. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
MYR1.292
Each (In a Pack of 50)
units
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 122-0071
Mfr. Part No.MJ11016G
MYR27.237
Each (In a Tray of 100)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 463-000
Mfr. Part No.MJ11016G
MYR38.135
Each (In a Pack of 2)
units
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS Stock No. 178-9082
Mfr. Part No.SN75469NE4
MYR4.86
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 163-1230
Mfr. Part No.TIP122G
MYR2.779
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 103-5056
Mfr. Part No.MJD122G
MYR2.191
Each (In a Tube of 75)
units
NPN 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 100-7578
Mfr. Part No.MJD122T4G
MYR1.117
Each (On a Reel of 2500)
units
NPN 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 688-1509
Mfr. Part No.MJD122G
MYR2.845
Each (In a Pack of 2)
units
NPN 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 774-3246
Mfr. Part No.2N6052G
MYR37.38
Each
units
PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 919-6481
Mfr. Part No.BDW93CFP
MYR5.233
Each (In a Tube of 50)
units
NPN 15 A 100 V - TO-220FP Through Hole 3 - Single 1 100 4 V 100 V -
RS Stock No. 426-229
Mfr. Part No.ULN2003D1013TR
MYR1.859
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. 545-0501
Mfr. Part No.TIP107G
MYR4.74
Each
units
PNP 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 200 - 100 V 2.5 V
RS Stock No. 793-1318
Mfr. Part No.BDW93CFP
MYR5.387
Each (In a Pack of 10)
units
NPN 15 A 100 V - TO-220FP Through Hole 3 - Single 1 100 4 V 100 V -
RS Stock No. 313-3204
Mfr. Part No.BD681
MYR8.52
Each
units
NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 168-5844
Mfr. Part No.ULN2074B
MYR10.594
Each (In a Tube of 25)
units
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 163-0840
Mfr. Part No.2N6052G
MYR22.14
Each (In a Tray of 100)
units
PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 274-964
Mfr. Part No.FZT705TC
MYR3.39
Each (In a Pack of 5)
units
PNP 2 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 544-9905
Mfr. Part No.BDX33CG
MYR3.885
Each (In a Tube of 50)
units
NPN 10 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 750 - 100 V 2.5 V