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. 712-2873
Mfr. Part No.ZXTN04120HFFTA
TWD16.40
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. 122-0677
Mfr. Part No.ZXTN04120HFFTA
TWD6.60
Each (On a Reel of 3000)
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. 669-7584
Mfr. Part No.FMMT614TA
TWD11.40
Each (In a Pack of 25)
units
NPN 500 mA 100 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 1.9 V 120 V 1 V
RS Stock No. 122-2846
Mfr. Part No.BCV46TA
TWD4.10
Each (On a Reel of 3000)
units
PNP -500 mA 60 V -10 V SOT-23 Surface Mount 3 - Single 1 10000 -1.5 V -80 V -1 V
RS Stock No. 823-1350
Mfr. Part No.FCX605TA
TWD18.80
Each (In a Pack of 25)
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. 922-7923
Mfr. Part No.ZTX601B
TWD13.80
Each (In a Bag of 4000)
units
NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 5000 1.9 V 180 V 1.2 V
RS Stock No. 669-7638
Mfr. Part No.FMMT634TA
TWD19.20
Each (In a Pack of 5)
units
NPN 900 mA 100 V 12 V SOT-23 Surface Mount 3 - Single 1 5000 1.65 V 120 V 0.96 V
RS Stock No. 669-7568
Mfr. Part No.FCX705TA
TWD17.10
Each (In a Pack of 10)
units
PNP 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 922-8392
Mfr. Part No.FZT7053TA
TWD8.40
Each (On a Reel of 1000)
units
NPN 1.5 A 100 V 12 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 - 100 V 1.5 V
RS Stock No. 121-9472
Mfr. Part No.BCV49TA
TWD4.80
Each (On a Reel of 1000)
units
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 165-8529
Mfr. Part No.MMBT6427-7-F
TWD1.40
Each (On a Reel of 3000)
units
NPN 500 mA 40 V 12 V SOT-23 Surface Mount 3 - Single 1 20000 2 V 40 V 1.5 V
RS Stock No. 122-2366
Mfr. Part No.FZT600BTA
TWD10.10
Each (On a Reel of 1000)
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NPN 2 A 140 V 160 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 1.9 V 160 V 1.2 V
RS Stock No. 165-8351
Mfr. Part No.ULN2004AS16-13
TWD6.10
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 122-0251
Mfr. Part No.FZT696BTA
TWD12.30
Each (On a Reel of 1000)
units
NPN 500 mA 180 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 150 0.9 V 180 V 0.25 V
RS Stock No. 121-9528
Mfr. Part No.BCV47TA
TWD1.80
Each (On a Reel of 3000)
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NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 922-7762
Mfr. Part No.ZTX605
TWD13.80
Each (In a Bag of 4000)
units
NPN 1 A 120 V 10 V E-Line Through Hole 3 - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 921-0824
Mfr. Part No.ULN2004AS16-13
TWD13.90
Each (In a Pack of 30)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 2 - - - 1.6 V
RS Stock No. 823-1401
Mfr. Part No.FZT600BTA
TWD19.50
Each (In a Pack of 10)
units
NPN 2 A 140 V 160 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 1.9 V 160 V 1.2 V
RS Stock No. 669-7552
Mfr. Part No.ZTX601B
TWD30.00
Each (In a Pack of 5)
units
NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 5000 1.9 V 180 V 1.2 V
RS Stock No. 154-986
Mfr. Part No.FZT600TA
TWD19.50
Each (In a Pack of 10)
units
NPN 2 A 140 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 160 V 1.2 V