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. 426-229
Mfr. Part No.ULN2003D1013TR
MYR1.448
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. 862-4954
Mfr. Part No.MJ11012G
MYR28.27
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. 908-7031
Mfr. Part No.OP830SL
BrandOptek
MYR12.16
Each
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- - - - TO-18 Through Hole - - - - - - - -
RS Stock No. 168-8906
Mfr. Part No.ULQ2803A
MYR3.863
Each (In a Tube of 20)
units
NPN 500 mA 50 V 30 V PDIP Through Hole 18 - Common Emitter 8 1000 @ 350 mA @ 2 V - 30 V 1.6 V
RS Stock No. 168-7874
Mfr. Part No.ST901T
MYR3.394
Each (In a Tube of 50)
units
NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS Stock No. 100-7572
Mfr. Part No.MJD127T4G
MYR1.22
Each (On a Reel of 2500)
units
PNP 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. 177-5536
Mfr. Part No.A2982SLWTR-T
MYR12.947
Each (On a Reel of 1000)
units
NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS Stock No. 712-2873
Mfr. Part No.ZXTN04120HFFTA
MYR1.999
Each (In a Pack of 10)
units
NPN 1 A 120 V 10 V SOT-23F Surface Mount 3 - Single 2 1000 1.7 V 140 V 1.5 V
RS Stock No. 652-825
Mfr. Part No.ULN2004AN
MYR2.45
Each
units
NPN 500 mA 50 V 50 V PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 774-3662
Mfr. Part No.TIP142G
MYR8.31
Each (In a Pack of 2)
units
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 3.5 V 100 V 3 V
RS Stock No. 686-8124
Mfr. Part No.TIP105
MYR3.746
Each (In a Pack of 5)
units
PNP 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 200 - 60 V 2.5 V
RS Stock No. 163-2497
Mfr. Part No.MJD117T4G
MYR1.062
Each (On a Reel of 2500)
units
PNP 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
RS Stock No. 121-6417
Mfr. Part No.MJH11021G
MYR13.724
Each (In a Tube of 30)
units
PNP 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 790-5328
Mfr. Part No.MJD117G
MYR2.12
Each (In a Pack of 15)
units
PNP 2 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 169-8516
Mfr. Part No.BDX53CTU
MYR2.172
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. 790-5319
Mfr. Part No.MJD112G
MYR2.14
Each (In a Pack of 15)
units
NPN 2 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 807-5172
Mfr. Part No.BDX53CTU
MYR2.515
Each (In a Pack of 10)
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. 810-3668
Mfr. Part No.ST901T
MYR3.394
Each (In a Pack of 10)
units
NPN 4 A 350 V 5 V TO-220 Through Hole 3 - Single 1 500 1.8 V - 2 V
RS Stock No. 163-2365
Mfr. Part No.BD679AG
MYR1.60
Each (In a Box of 500)
units
NPN 4 A 80 V 5 V TO-225 Through Hole 3 - Single 1 750 - 80 V 2.8 V
RS Stock No. 732-0887
Mfr. Part No.ULN2003AIN
MYR3.006
Each (In a Pack of 5)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V