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).

...
Read more Read less

Filters

Viewing 1 - 20 of 59 products
Results per page
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. 669-7638
Mfr. Part No.FMMT634TA
$0.672
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. 922-7948
Mfr. Part No.FMMT634TA
$0.435
Each (On a Reel of 3000)
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. 121-9962
Mfr. Part No.FZT603TA
$0.39
Each (On a Reel of 1000)
units
NPN 2 A 80 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.95 V 100 V 1.13 V
RS Stock No. 146-0920
Mfr. Part No.MMBTA64-7-F
$0.046
Each (On a Reel of 3000)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 1 20000 -2 V -30 V -1.5 V
RS Stock No. 712-2879
Mfr. Part No.MMBTA28-7-F
$0.23
Each (In a Pack of 50)
units
NPN 500 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 80 V 1.5 V
RS Stock No. 922-7718
Mfr. Part No.FZT605TA
$0.46
Each (On a Reel of 1000)
units
NPN 1.5 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 121-9450
Mfr. Part No.MMBTA28-7-F
$0.093
Each (On a Reel of 3000)
units
NPN 500 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 80 V 1.5 V
RS Stock No. 669-7568
Mfr. Part No.FCX705TA
$0.785
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. 121-9528
Mfr. Part No.BCV47TA
$0.078
Each (On a Reel of 3000)
units
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. 122-0289
Mfr. Part No.BST52TA
$0.218
Each (On a Reel of 1000)
units
NPN 500 mA 80 V 10 V SOT-89 Surface Mount 3 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 669-7486
Mfr. Part No.ZTX601
$1.152
Each (In a Pack of 5)
units
NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 1000 1.9 V 180 V 1.2 V
RS Stock No. 121-9417
Mfr. Part No.FMMT38CTA
$0.196
Each (On a Reel of 3000)
units
NPN 300 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 5000 - 80 V 1.25 V
RS Stock No. 669-7394
Mfr. Part No.FZT603TA
$0.882
Each (In a Pack of 10)
units
NPN 2 A 80 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.95 V 100 V 1.13 V
RS Stock No. 823-3047
Mfr. Part No.MMBTA64-7-F
$0.054
Each (In a Pack of 200)
units
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 1 20000 -2 V -30 V -1.5 V
RS Stock No. 922-7627
Mfr. Part No.FZT600TA
$0.484
Each (On a Reel of 1000)
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
RS Stock No. 274-958
Mfr. Part No.FZT605TA
$1.058
Each (In a Pack of 5)
units
NPN 1.5 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 500 1.8 V 140 V 1.5 V
RS Stock No. 669-7304
Mfr. Part No.FZT705TA
$1.149
Each (In a Pack of 10)
units
PNP 2 A 120 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 2000 1.8 V 140 V 2.5 V
RS Stock No. 738-4936
Mfr. Part No.BST52TA
$0.494
Each (On a Tape of 25)
units
NPN 500 mA 80 V 10 V SOT-89 Surface Mount 3 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 154-986
Mfr. Part No.FZT600TA
$1.165
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
RS Stock No. 751-3534
Mfr. Part No.BCX38C
$0.714
Each (In a Pack of 25)
units
NPN 800 mA 60 V 10 V TO-92 Through Hole 3 - Single 1 5000 - 80 V 1.25 V