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
€0.275
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. 816-7811
Mfr. Part No.BST60
BrandNexperia
€0.28
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. 725-8461
Mfr. Part No.BSP61,115
BrandNexperia
€0.442
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. 725-8467
Mfr. Part No.BSP51,115
BrandNexperia
€0.442
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. 865-2090
Mfr. Part No.BCV46,215
BrandNexperia
€0.036
Each (In a Pack of 100)
units
PNP -500 mA 60 V -10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 2000 -1.5 V -80 V -1 V
RS Stock No. 166-1532
Mfr. Part No.BST52,115
BrandNexperia
€0.164
Each (On a Reel of 1000)
units
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 169-0631
Mfr. Part No.BCV47,215
BrandNexperia
€0.063
Each (On a Reel of 3000)
units
NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 725-8464
Mfr. Part No.BCV47,215
BrandNexperia
€0.251
Each (On a Tape of 50)
units
NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 816-7817
Mfr. Part No.BST51
BrandNexperia
€0.281
Each (In a Pack of 10)
units
NPN 1 A 60 V 5 V SOT-89 Surface Mount 3 - Single 2 1000 1.9 V 80 V 1.3 V
RS Stock No. 165-9985
Mfr. Part No.BSP62,115
BrandNexperia
€0.207
Each (On a Reel of 1000)
units
PNP -1 A 80 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -90 V -1.3 V
RS Stock No. 484-2331
Mfr. Part No.BCV49,115
BrandNexperia
€0.292
Each (In a Pack of 10)
units
NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 166-1531
Mfr. Part No.BST50,115
BrandNexperia
€0.187
Each (On a Reel of 1000)
units
NPN 1 A 45 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 484-2690
Mfr. Part No.BST50,115
BrandNexperia
€0.192
Each (In a Pack of 5)
units
NPN 1 A 45 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 792-0888
Mfr. Part No.BSP62,115
BrandNexperia
€0.514
Each (On a Reel of 20)
units
PNP -1 A 80 V -5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 -1.9 V -90 V -1.3 V
RS Stock No. 165-8645
Mfr. Part No.BST51
BrandNexperia
€0.22
Each (On a Reel of 1000)
units
NPN 1 A 60 V 5 V SOT-89 Surface Mount 3 - Single 2 1000 1.9 V 80 V 1.3 V
RS Stock No. 165-9993
Mfr. Part No.BST62,115
BrandNexperia
€0.24
Each (On a Reel of 1000)
units
PNP -1 A 80 V -5 V SOT-89 Surface Mount 3 - Single 1 1000 -1.9 V -90 V -1.3 V
RS Stock No. 484-2634
Mfr. Part No.BSP52,115
BrandNexperia
€0.438
Each (In a Pack of 10)
units
NPN 1 A 80 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS Stock No. 103-5699
Mfr. Part No.BCV49,115
BrandNexperia
€0.119
Each (On a Reel of 1000)
units
NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 484-5251
Mfr. Part No.BSP50,115
BrandNexperia
€0.472
Each (In a Pack of 10)
units
NPN 1 A 45 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS Stock No. 865-2097
Mfr. Part No.BCV27,215
BrandNexperia
€0.084
Each (In a Pack of 100)
units
NPN 500 mA 30 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 4000 1.5 V 40 V 1 V