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. 688-1509
Mfr. Part No.MJD122G
MYR2.665
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. 714-2690
Mfr. Part No.BDX54C
MYR1.397
Each (In a Pack of 10)
units
PNP 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 100 V 2 V
RS Stock No. 714-2687
Mfr. Part No.BDX33C
MYR3.77
Each (In a Pack of 10)
units
NPN 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 166-1955
Mfr. Part No.BCV27
MYR0.192
Each (On a Reel of 3000)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 100-7578
Mfr. Part No.MJD122T4G
MYR1.066
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. 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. 103-5146
Mfr. Part No.TIP120G
MYR2.825
Each (In a Tube of 50)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS Stock No. 545-2361
Mfr. Part No.TIP127G
MYR3.59
Each
units
PNP 5 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 102-4093
Mfr. Part No.BD681
MYR3.224
Each (In a Tube of 50)
units
NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 919-6472
Mfr. Part No.ULN2003D1013TR
MYR0.74
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. 102-4090
Mfr. Part No.BDX33C
MYR3.77
Each (In a Tube of 50)
units
NPN 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 122-2358
Mfr. Part No.FCX605TA
MYR1.189
Each (On a Reel of 1000)
units
NPN 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 5000 1.8 V 140 V 1.5 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. 774-3246
Mfr. Part No.2N6052G
MYR34.46
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. 545-0501
Mfr. Part No.TIP107G
MYR4.03
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. 922-7712
Mfr. Part No.FZT705TC
MYR1.595
Each (On a Reel of 4000)
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. 463-189
Mfr. Part No.MJD122T4G
MYR2.04
Each (In a Pack of 20)
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. 544-9905
Mfr. Part No.BDX33CG
MYR3.539
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
RS Stock No. 633-644
Mfr. Part No.ULN2074B
MYR12.47
Each
units
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 178-7525
Mfr. Part No.BSP52T1G
MYR0.462
Each (On a Reel of 1000)
units
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