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. 866-0196
Mfr. Part No.ULN2803ADW
TWD30
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 752-8205
Mfr. Part No.BSP60H6327XTSA1
BrandInfineon
TWD5
Each (In a Pack of 10)
units
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS Stock No. 646-6311
Mfr. Part No.ULN2803ADW
TWD42
Each (In a Pack of 5)
units
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS Stock No. 165-7512
Mfr. Part No.BSP60H6327XTSA1
BrandInfineon
TWD5
Each (On a Reel of 1000)
units
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS Stock No. 680-7220
Mfr. Part No.A2982SLWTR-T
TWD67
Each (In a Pack of 5)
units
NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS Stock No. 166-2225
Mfr. Part No.MMBTA28
TWD3
Each (On a Reel of 3000)
units
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS Stock No. 807-4731
Mfr. Part No.MMBTA28
TWD6
Each (On a Tape of 50)
units
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS Stock No. 805-4412
Mfr. Part No.NJD35N04G
TWD21
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. 806-5046
Mfr. Part No.NJD35N04T4G
TWD22
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. 686-8199
Mfr. Part No.ULN2804A
TWD36
Each (In a Pack of 10)
units
NPN 0.5 A 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS Stock No. 168-6450
Mfr. Part No.ULN2003A
TWD7
Each (In a Tube of 25)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 725-8467
Mfr. Part No.BSP51,115
BrandNexperia
TWD20
Each (In a Pack of 10)
units
NPN 1 A 60 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 80 V 1.3 V
RS Stock No. 145-2940
Mfr. Part No.NJD35N04G
TWD11
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. 686-8209
Mfr. Part No.ULN2003A
TWD13
Each (In a Pack of 20)
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 163-0785
Mfr. Part No.NJD35N04T4G
TWD13
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. 168-6447
Mfr. Part No.ULN2804A
TWD18
Each (In a Tube of 20)
units
- - 50 V - PDIP Through Hole 18 - - - - - - -
RS Stock No. 725-8461
Mfr. Part No.BSP61,115
BrandNexperia
TWD20
Each (In a Pack of 10)
units
PNP -1 A 60 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -80 V -1.3 V
RS Stock No. 166-0488
Mfr. Part No.BSP61,115
BrandNexperia
TWD8
Each (On a Reel of 1000)
units
PNP -1 A 60 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -80 V -1.3 V
RS Stock No. 163-0972
Mfr. Part No.MMBTA63LT1G
TWD1
Each (On a Reel of 3000)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 168-6833
Mfr. Part No.ULN2803A
TWD18
Each (In a Tube of 20)
units
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V