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. 165-8643
Mfr. Part No.BST60
BrandNexperia
TWD10.70
Each (On a Reel of 1000)
units
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS Stock No. 163-0972
Mfr. Part No.MMBTA63LT1G
TWD1.10
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. 178-4725
Mfr. Part No.MC1413BDG
TWD7.10
Each (In a Tube of 48)
units
- - - - - - - - - - - - - -
RS Stock No. 178-7560
Mfr. Part No.MC1413BDR2G
TWD5.90
Each (On a Reel of 2500)
units
- - - - - - - - - - - - - -
RS Stock No. 168-6833
Mfr. Part No.ULN2803A
TWD33.60
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
RS Stock No. 162-7586
Mfr. Part No.ULN2004AID
TWD21.10
Each (In a Tube of 40)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 816-7811
Mfr. Part No.BST60
BrandNexperia
TWD13.50
Each (In a Pack of 10)
units
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS Stock No. 781-4285
Mfr. Part No.MMBTA63LT1G
TWD2.00
Each (In a Pack of 100)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS Stock No. 756-0310
Mfr. Part No.2SD1223(TE16L1,NQ)
BrandToshiba
TWD37.00
Each (In a Pack of 5)
units
NPN 4 A 80 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 100 V 1.5 V
RS Stock No. 773-7743
Mfr. Part No.MC1413BDR2G
TWD14.60
Each (On a Tape of 10)
units
NPN 500 mA 50 V 5 V SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 103-1078
Mfr. Part No.TIP122
TWD17.50
Each (In a Tube of 50)
units
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS Stock No. 688-9408
Mfr. Part No.MC1413BDG
TWD19.40
Each (In a Pack of 5)
units
NPN 500 mA 50 V 5 V SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 633-650
Mfr. Part No.ULN2068B
TWD94.00
Each
units
NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 527-883
Mfr. Part No.SN75468N
TWD25.90
Each (In a Tube of 25)
units
NPN 500 mA 100 V - PDIP Through Hole 16 - Common Emitter 7 - - - -
RS Stock No. 251-9893
Mfr. Part No.BD682
TWD22.60
Each (In a Pack of 5)
units
PNP 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 102-4091
Mfr. Part No.TIP142
TWD53.20
Each (In a Tube of 30)
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NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS Stock No. 313-6944
Mfr. Part No.BD677
TWD13.00
Each
units
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 486-0042
Mfr. Part No.BDX53B
TWD33.60
Each (In a Pack of 5)
units
NPN 8 A 80 V 5 V TO-220 Through Hole 3 - Single 1 750 2.5 V 80 V 2 V
RS Stock No. 920-8979
Mfr. Part No.ULN2068B
TWD77.00
Each (In a Tube of 25)
units
NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 774-3209
Mfr. Part No.MJ11032G
TWD454.00
Each
units
NPN 50 A 120 V 5 V TO-204 Through Hole 2 - Single 1 400 4.5 V 120 V 3.5 V