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 725-8467
製造零件編號BSP51,115
BrandNexperia
HK$3.475
/個 (每包:10個)
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NPN 1 A 60 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 80 V 1.3 V
RS庫存編號 166-0475
製造零件編號BSP50,115
BrandNexperia
HK$1.70
個 (在毎卷:1000)
單位
NPN 800 mA 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 1.9 V 60 V 1.3 V
RS庫存編號 165-8645
製造零件編號BST51
BrandNexperia
HK$2.555
個 (在毎卷:1000)
單位
NPN 1 A 60 V 5 V SOT-89 Surface Mount 3 - Single 2 1000 1.9 V 80 V 1.3 V
RS庫存編號 865-2090
製造零件編號BCV46,215
BrandNexperia
HK$0.428
/個 (每包:100個)
單位
PNP -500 mA 60 V -10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 2000 -1.5 V -80 V -1 V
RS庫存編號 725-8461
製造零件編號BSP61,115
BrandNexperia
HK$3.788
/個 (每包:10個)
單位
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庫存編號 484-2634
製造零件編號BSP52,115
BrandNexperia
HK$4.038
/個 (每包:10個)
單位
NPN 1 A 80 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS庫存編號 725-8464
製造零件編號BCV47,215
BrandNexperia
HK$1.877
Each (On a Tape of 50)
單位
NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 484-2690
製造零件編號BST50,115
BrandNexperia
HK$5.214
/個 (每包:5個)
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NPN 1 A 45 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 60 V 1.3 V
RS庫存編號 725-8473
製造零件編號PZTA14,115
BrandNexperia
HK$2.453
/個 (每包:20個)
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NPN 500 mA 30 V 10 V SOT-223 Surface Mount 3 + Tab - Single 1 10000 - 30 V 1.5 V
RS庫存編號 816-7811
製造零件編號BST60
BrandNexperia
HK$2.838
/個 (每包:10個)
單位
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS庫存編號 165-8643
製造零件編號BST60
BrandNexperia
HK$2.555
個 (在毎卷:1000)
單位
PNP -1 A 45 V -5 V SOT-89 Surface Mount 3 - Single 2 1000 -1.9 V -60 V -1.3 V
RS庫存編號 169-0631
製造零件編號BCV47,215
BrandNexperia
HK$0.519
個 (在毎卷:3000)
單位
NPN 500 mA 60 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 103-5699
製造零件編號BCV49,115
BrandNexperia
HK$1.309
個 (在毎卷:1000)
單位
NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 792-0914
製造零件編號BST62,115
BrandNexperia
HK$3.294
Each (On a Tape of 10)
單位
PNP -1 A 80 V -5 V SOT-89 Surface Mount 3 - Single 1 1000 -1.9 V -90 V -1.3 V
RS庫存編號 865-2097
製造零件編號BCV27,215
BrandNexperia
HK$0.415
/個 (每包:100個)
單位
NPN 500 mA 30 V 10 V SOT-23 (TO-236AB) Surface Mount 3 - Single 2 4000 1.5 V 40 V 1 V
RS庫存編號 166-0488
製造零件編號BSP61,115
BrandNexperia
HK$1.793
個 (在毎卷:1000)
單位
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庫存編號 166-1462
製造零件編號BSP52,115
BrandNexperia
HK$1.70
個 (在毎卷:1000)
單位
NPN 1 A 80 V 5 V SOT-223 (SC-73) Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS庫存編號 484-2707
製造零件編號BST52,115
BrandNexperia
HK$5.392
/個 (每包:5個)
單位
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS庫存編號 166-1532
製造零件編號BST52,115
BrandNexperia
HK$2.53
個 (在毎卷:1000)
單位
NPN 1 A 80 V 5 V UPAK Surface Mount 4 - Single 1 1000 1.9 V 90 V 1.3 V
RS庫存編號 484-2331
製造零件編號BCV49,115
BrandNexperia
HK$2.387
/個 (每包:10個)
單位
NPN 500 mA 60 V 10 V UPAK Surface Mount 4 - Single 1 2000 1.5 V 80 V 1 V