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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Omschrijving Prijs 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-stocknr. 110-7440
FabrikantnummerBSP61H6327XTSA1
FabrikantInfineon
€ 0,21
Each (In a Pack of 100)
Aantal stuks
PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS-stocknr. 752-8072
FabrikantnummerBCV46E6327HTSA1
FabrikantInfineon
€ 0,068
Each (In a Pack of 50)
Aantal stuks
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 911-4754
FabrikantnummerBCV47E6327HTSA1
FabrikantInfineon
€ 0,069
Each (On a Reel of 3000)
Aantal stuks
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 Single Single 1 2000 1.5 V - 1 V
RS-stocknr. 752-8205
FabrikantnummerBSP60H6327XTSA1
FabrikantInfineon
€ 0,257
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 752-8079
FabrikantnummerBCV61BE6327HTSA1
FabrikantInfineon
€ 0,108
Each (On a Tape of 25)
Aantal stuks
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV
RS-stocknr. 165-7709
FabrikantnummerBCV61BE6327HTSA1
FabrikantInfineon
€ 0,052
Each (On a Reel of 3000)
Aantal stuks
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV
RS-stocknr. 165-7512
FabrikantnummerBSP60H6327XTSA1
FabrikantInfineon
€ 0,233
Each (On a Reel of 1000)
Aantal stuks
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-stocknr. 145-9578
FabrikantnummerBSP61H6327XTSA1
FabrikantInfineon
€ 0,12
Each (On a Reel of 1000)
Aantal stuks
PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS-stocknr. 166-0976
FabrikantnummerBCV49H6327XTSA1
FabrikantInfineon
€ 0,119
Each (On a Reel of 1000)
Aantal stuks
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 445-2095
FabrikantnummerBCV47E6327HTSA1
FabrikantInfineon
€ 0,284
Each (In a Pack of 25)
Aantal stuks
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS-stocknr. 178-7473
FabrikantnummerBCV26E6327HTSA1
FabrikantInfineon
€ 0,049
Each (On a Reel of 3000)
Aantal stuks
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS-stocknr. 752-8202
FabrikantnummerBSP50H6327XTSA1
FabrikantInfineon
€ 0,23
Each (In a Pack of 10)
Aantal stuks
NPN 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS-stocknr. 827-0008
FabrikantnummerBCV26E6327HTSA1
FabrikantInfineon
€ 0,088
Each (On a Reel of 500)
Aantal stuks
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS-stocknr. 110-7773
FabrikantnummerBCV49H6327XTSA1
FabrikantInfineon
€ 0,19
Each (In a Pack of 100)
Aantal stuks
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V