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).

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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. 163-0785
Mfr. Part No.NJD35N04T4G
R 7.054
Each (On a Reel of 2500)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS stock no. 806-5046
Mfr. Part No.NJD35N04T4G
R 11.63
Each (On a Tape of 25)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS stock no. 145-2940
Mfr. Part No.NJD35N04G
R 10.647
Each (In a Tube of 75)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS stock no. 805-4412
Mfr. Part No.NJD35N04G
R 11.706
Each (In a Pack of 25)
units
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS stock no. 166-1812
Mfr. Part No.BCV26
R 1.035
Each (On a Reel of 3000)
units
PNP 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. 671-1122
Mfr. Part No.BCV26
R 4.189
Each (In a Pack of 25)
units
PNP 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. 774-3653
Mfr. Part No.TIP120G
R 12.599
Each (In a Pack of 10)
units
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS stock no. 103-5146
Mfr. Part No.TIP120G
R 5.60
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. 163-2497
Mfr. Part No.MJD117T4G
R 2.954
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. 163-2498
Mfr. Part No.MJD31CT4G
R 3.006
Each (On a Reel of 2500)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS stock no. 790-5328
Mfr. Part No.MJD117G
R 2.531
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. 545-0242
Mfr. Part No.MJD31CG
R 38.03
Each
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS stock no. 464-136
Mfr. Part No.MJD31CT4G
R 5.606
Each (In a Pack of 20)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS stock no. 688-1505
Mfr. Part No.MJD117T4G
R 3.475
Each (In a Pack of 2)
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. 145-2795
Mfr. Part No.MJD31CG
R 6.248
Each (In a Tube of 75)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS stock no. 145-3571
Mfr. Part No.MJD117G
R 2.49
Each (In a Tube of 75)
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. 103-2945
Mfr. Part No.BU323ZG
R 32.048
Each (In a Tube of 30)
units
NPN 10 A 350 V 6 V TO-247 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS stock no. 166-1813
Mfr. Part No.MMBTA13
R 0.839
Each (On a Reel of 3000)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 30 V 1.5 V
RS stock no. 671-1153
Mfr. Part No.MMBTA13
R 0.404
Each (In a Pack of 20)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 30 V 1.5 V
RS stock no. 545-0157
Mfr. Part No.BU323ZG
R 39.04
Each
units
NPN 10 A 350 V 6 V SOT-93 Through Hole 3 - Single 1 150 2.2 V - 1.6 V