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 686-8209
製造零件編號ULN2003A
HK$3.323
/個 (每包:20個)
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NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 168-6450
製造零件編號ULN2003A
HK$1.791
毎管:25 個
單位
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 486-0294
製造零件編號TIP142
HK$13.754
/個 (每包:5個)
單位
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS庫存編號 102-4091
製造零件編號TIP142
HK$10.91
毎管:30 個
單位
NPN 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS庫存編號 714-1164
製造零件編號ULN2802A
HK$7.538
/個 (每包:5個)
單位
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.1 V
RS庫存編號 714-1167
製造零件編號ULN2803A
HK$8.426
/個 (每包:5個)
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NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS庫存編號 313-3197
製造零件編號BU931P
HK$22.24
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NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS庫存編號 426-229
製造零件編號ULN2003D1013TR
HK$3.052
/個 (每包:10個)
單位
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 168-6832
製造零件編號ULN2802A
HK$7.209
毎管:20 個
單位
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.1 V
RS庫存編號 168-6833
製造零件編號ULN2803A
HK$5.195
毎管:20 個
單位
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V
RS庫存編號 919-6472
製造零件編號ULN2003D1013TR
HK$1.171
個 (在毎卷:2500)
單位
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 102-4097
製造零件編號BU931P
HK$18.47
毎管:30 個
單位
NPN 15 A 400 V 5 V TO-247 Through Hole 3 - Single 1 300 2.5 V - 1.8 V
RS庫存編號 168-6442
製造零件編號ULN2001D1013TR
HK$1.419
個 (在毎卷:2500)
單位
NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 686-8155
製造零件編號ULN2001D1013TR
HK$3.06
/個 (每包:20個)
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NPN 500 mA 50 V - SOIC Surface Mount 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 486-0301
製造零件編號TIP147
HK$16.90
單位
PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS庫存編號 486-0288
製造零件編號TIP132
HK$8.98
/個 (每包:5個)
單位
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 4 V
RS庫存編號 102-4104
製造零件編號TIP147
HK$13.461
毎管:30 個
單位
PNP 10 A 100 V 5 V TO-247 Through Hole 3 - Single 1 500 - 100 V 3 V
RS庫存編號 102-4096
製造零件編號TIP132
HK$6.987
毎管:50 個
單位
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 500 - 100 V 4 V
RS庫存編號 103-1078
製造零件編號TIP122
HK$2.423
毎管:50 個
單位
NPN 8 A 100 V 5 V TO-220 Through Hole 3 - Single 1 1000 - 100 V 4 V
RS庫存編號 633-638
製造零件編號ULN2064B
HK$19.67
單位
NPN 1.75 A 50 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.4 V