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. 121-9982
Mfr. Part No.FCX705TA
HK$2.239
Each (On a Reel of 1000)
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. 166-0488
Mfr. Part No.BSP61,115
BrandNexperia
HK$1.793
Each (On a Reel of 1000)
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. 100-7572
Mfr. Part No.MJD127T4G
HK$2.254
Each (On a Reel of 2500)
units
PNP 8 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 633-650
Mfr. Part No.ULN2068B
HK$21.33
Each
units
NPN 1.75 A 50 V 50 V PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS Stock No. 806-2911
Mfr. Part No.MJE800STU
HK$3.761
Each (In a Tube of 60)
units
NPN 4 A 60 V 5 V TO-126 Through Hole 3 - Single 2 750 2.5 V 60 V 2.5 V
RS Stock No. 169-8763
Mfr. Part No.TIP102TU
HK$4.654
Each (In a Tube of 50)
units
NPN 15 A 100 V 5 V TO-220 Through Hole 3 - Single 2 200 - 100 V 2.5 V
RS Stock No. 163-2169
Mfr. Part No.LB1205M-TLM-E
HK$10.364
Each (On a Reel of 2000)
units
NPN 1.5 A - 5 V MFP16FS Surface Mount 3 Dual - - - - - -
RS Stock No. 168-7305
Mfr. Part No.ULN2001A
HK$2.918
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. 827-0008
Mfr. Part No.BCV26E6327HTSA1
BrandInfineon
HK$0.599
Each (On a Reel of 500)
units
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS Stock No. 103-2945
Mfr. Part No.BU323ZG
HK$16.064
Each (In a Tube of 30)
units
NPN 10 A 350 V 6 V TO-247 Through Hole 3 - Single 1 150 2.2 V - 1.6 V
RS Stock No. 168-6447
Mfr. Part No.ULN2804A
HK$4.988
Each (In a Tube of 20)
units
- - 50 V - PDIP Through Hole 18 - - - - - - -
RS Stock No. 781-4253
Mfr. Part No.MMBT6427LT1G
HK$0.528
Each (On a Tape of 100)
units
NPN 500 mA 40 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 40 V 1.5 V
RS Stock No. 671-1125
Mfr. Part No.BCV27
HK$0.883
Each (In a Pack of 25)
units
NPN 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS Stock No. 313-3204
Mfr. Part No.BD681
HK$6.19
Each
units
NPN 4 A 100 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS Stock No. 166-1532
Mfr. Part No.BST52,115
BrandNexperia
HK$2.53
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. 790-5319
Mfr. Part No.MJD112G
HK$3.694
Each (In a Pack of 15)
units
NPN 2 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 1000 4 V 100 V 3 V
RS Stock No. 686-8161
Mfr. Part No.ULN2004D1013TR
HK$2.657
Each (In a Pack of 20)
units
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS Stock No. 165-7481
Mfr. Part No.MJD127T4
HK$1.369
Each (On a Reel of 2500)
units
PNP 5 A 100 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 100 4.5 V 100 V 4 V
RS Stock No. 738-4910
Mfr. Part No.BCV49TA
HK$2.784
Each (On a Tape of 25)
units
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS Stock No. 122-2366
Mfr. Part No.FZT600BTA
HK$2.437
Each (On a Reel of 1000)
units
NPN 2 A 140 V 160 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 1.9 V 160 V 1.2 V
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