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 665-8699
製造零件編號ULN2003ADR
HK$4.391
/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 790-5397
製造零件編號MJH11022G
HK$29.86
/個 (每包:2個)
單位
NPN 15 A 250 V 5 V TO-247 Through Hole 3 - Single 1 100 3.8 V 250 V 4 V
RS庫存編號 858-196
製造零件編號ULN2003AD
HK$4.60
單位
NPN 500 mA 50 V 50 V SOIC Surface Mount 16 - Common Emitter 7 - - - 1.6 V
RS庫存編號 168-6164
製造零件編號TIP137
HK$9.692
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 102-4092
製造零件編號BDW93C
HK$5.83
毎管:50 個
單位
NPN 12 A 100 V - TO-220 Through Hole 3 - Single 1 100 4 V 100 V 3 V
RS庫存編號 168-6084
製造零件編號BU941ZPFI
HK$28.07
毎管:30 個
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 688-1502
製造零件編號MJ11015G
HK$65.395
/個 (每包:2個)
單位
PNP 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 168-8977
製造零件編號ULN2801A
HK$8.148
毎管:20 個
單位
- 500 mA 50 V - DIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS庫存編號 178-1409
製造零件編號BD680
HK$6.02
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 800-9213
製造零件編號2N6667G
HK$6.355
/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
RS庫存編號 485-9682
製造零件編號TIP137
HK$11.372
/個 (每包:5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 102-4098
製造零件編號BD677
HK$2.802
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$6.18
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 633-638
製造零件編號ULN2064B
HK$19.17
單位
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V
RS庫存編號 103-5055
製造零件編號MJ11015G
HK$46.711
Each (In a Tray of 100)
單位
PNP 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 665-9190
製造零件編號ULN2003APW
HK$4.264
/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 162-6795
製造零件編號ULN2003LVDR
HK$2.12
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 808-0521
製造零件編號TIP147TTU
HK$7.47
/個 (每包:10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 100-7565
製造零件編號MJ11016G
HK$45.475
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 122-0071
製造零件編號MJ11016G
HK$46.29
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