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庫存編號 665-9190
製造零件編號ULN2003APW
HK$4.55
/個 (每包:10個)
單位
NPN 500 mA 50 V - TSSOP Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS庫存編號 103-5146
製造零件編號TIP120G
HK$4.08
毎管:50 個
單位
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 60 V 4 V
RS庫存編號 102-4098
製造零件編號BD677
HK$3.153
毎管:50 個
單位
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS庫存編號 145-3154
製造零件編號2N6667G
HK$4.877
毎管:50 個
單位
PNP 10 A 60 V 5 V TO-220AB Through Hole 3 - Single 1 1000 4.5 V dc 60 V dc 3 V dc
RS庫存編號 109-090
製造零件編號BD680
HK$4.06
單位
PNP 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS庫存編號 665-9204
製造零件編號ULQ2003AD
HK$3.72
/個 (每包:10個)
單位
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS庫存編號 178-1409
製造零件編號BD680
HK$2.129
毎管:50 個
單位
PNP 4 A 80 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 80 V 2.5 V
RS庫存編號 313-6944
製造零件編號BD677
HK$7.27
單位
NPN 4 A 60 V 5 V SOT-32 Through Hole 3 - Single 1 750 - 60 V 2.5 V
RS庫存編號 920-8975
製造零件編號ULN2064B
HK$17.015
毎管:25 個
單位
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS庫存編號 122-0071
製造零件編號MJ11016G
HK$30.307
Each (In a Tray of 100)
單位
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS庫存編號 163-0840
製造零件編號2N6052G
HK$30.013
Each (In a Tray of 100)
單位
PNP 12 A 100 V 5 V TO-204 Through Hole 2 - Single 1 100 4 V 100 V 3 V
RS庫存編號 145-4629
製造零件編號TIP120TU
HK$3.434
毎管:50 個
單位
NPN 8 A 60 V 5 V TO-220 Through Hole 3 - Single 2 1000 - 60 V 4 V
RS庫存編號 419-1144
製造零件編號BU941ZPFI
HK$27.30
單位
NPN 15 A 350 V 5 V TO-3PF Through Hole 3 - Single 1 300 2.7 V - 2 V
RS庫存編號 463-000
製造零件編號MJ11016G
HK$40.205
/個 (每包:2個)
單位
NPN 30 A 120 V 5 V TO-204 Through Hole 3 - Single 1 200 5 V 120 V 4 V
RS庫存編號 168-6164
製造零件編號TIP137
HK$6.712
毎管:50 個
單位
PNP 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 4 V
RS庫存編號 162-6795
製造零件編號ULN2003LVDR
HK$2.014
個 (在毎卷:2500)
單位
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS庫存編號 809-5475
製造零件編號ULN2003LVDR
HK$13.70
單位
NPN 140 mA 8 V - SOIC Surface Mount 16 - Common Emitter 7 - - - 0.49 V
RS庫存編號 125-0077
製造零件編號MJF122G
HK$6.337
毎管:50 個
單位
NPN 8 A 100 V 5 V TO-220FP Through Hole 3 - Single 1 1000 - 100 V 3.5 V dc
RS庫存編號 169-8767
製造零件編號TIP147TTU
HK$5.523
毎管:50 個
單位
PNP -10 A 100 V -5 V TO-220 Through Hole 3 - Single 2 500 -3.5 V -100 V -2 V
RS庫存編號 800-9213
製造零件編號2N6667G
HK$6.113
/個 (每包:10個)
單位
PNP 10 A 60 V 5 V TO-220AB Through Hole 3 - Single 1 1000 4.5 V dc 60 V dc 3 V dc