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 typesDarlington 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. 102-4098
Mfr. Part No.BD677
SGD0.24
Each (In a Tube of 50)
units
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS Stock No. 168-6441
Mfr. Part No.MJD117T4
SGD0.304
Each (On a Reel of 2500)
units
PNP 4 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 200 4 V 100 V 3 V
RS Stock No. 166-1532
Mfr. Part No.BST52,115
BrandNexperia
SGD0.393
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. 484-5251
Mfr. Part No.BSP50,115
BrandNexperia
SGD0.345
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. 484-2707
Mfr. Part No.BST52,115
BrandNexperia
SGD0.886
Each (In a Pack of 5)
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. 168-6440
Mfr. Part No.ULQ2003D1013TR
SGD0.21
Each (On a Reel of 2500)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 313-6944
Mfr. Part No.BD677
SGD1.13
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. 688-9411
Mfr. Part No.NCV1413BDR2G
SGD0.842
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. 800-9702
Mfr. Part No.BSP52T3G
SGD0.382
Each (In a Pack of 50)
units
NPN 1 A 80 V 5 V SOT-223 Surface Mount 3 + 1 (Tab) - Single 1 2000 1.9 V 90 V 1.3 V
RS Stock No. 877-2946
Mfr. Part No.STP03D200
SGD8.144
Each (In a Pack of 5)
units
NPN 100 mA 1200 V 20 V TO-220 Through Hole 3 - Single 1 230 @ 20 mA @ 10 V 2 V 2000 V 2 V
RS Stock No. 774-3246
Mfr. Part No.2N6052G
SGD8.34
Each
units
PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS Stock No. 102-4100
Mfr. Part No.TIP121
SGD0.397
Each (In a Tube of 50)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 752-8072
Mfr. Part No.BCV46E6327HTSA1
BrandInfineon
SGD0.101
Each (In a Pack of 50)
units
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 168-6448
Mfr. Part No.ULN2004A
SGD0.308
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. 145-2795
Mfr. Part No.MJD31CG
SGD0.26
Each (In a Tube of 75)
units
NPN - 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 10 - 100 V 1.2 V
RS Stock No. 163-2654
Mfr. Part No.NCV1413BDR2G
SGD0.451
Each (On a Reel of 2500)
units
NPN 500 mA 50 V 5 V SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 485-9660
Mfr. Part No.TIP121
SGD1.25
Each (In a Pack of 5)
units
NPN 5 A 80 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 80 V 4 V
RS Stock No. 652-819
Mfr. Part No.ULN2002AN
SGD1.21
Each
units
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 - - - 1.6 V
RS Stock No. 790-5397
Mfr. Part No.MJH11022G
SGD5.065
Each (In a Pack of 2)
units
NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS Stock No. 163-2366
Mfr. Part No.BDW42G
SGD0.763
Each (In a Tube of 50)
units
NPN 15 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 250 - 100 V 3 V
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Description:
Darlington transistor power drivers are high-voltage, high-current switch arrays containing multiple open-collector Darlington pairs and integral suppression diodes for inductive loads. The high current rating of each output is 500 mA or higher. The inputs are pinned opposite the outputs ...