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 752-8202
製造零件編號BSP50H6327XTSA1
BrandInfineon
HK$1.949
/個 (每包:10個)
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NPN 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS庫存編號 110-7440
製造零件編號BSP61H6327XTSA1
BrandInfineon
HK$1.53
/個 (每包:100個)
單位
PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS庫存編號 752-8205
製造零件編號BSP60H6327XTSA1
BrandInfineon
HK$1.803
/個 (每包:10個)
單位
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS庫存編號 911-4754
製造零件編號BCV47E6327HTSA1
BrandInfineon
HK$0.292
個 (在毎卷:3000)
單位
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 Single Single 1 2000 1.5 V - 1 V
RS庫存編號 752-8072
製造零件編號BCV46E6327HTSA1
BrandInfineon
HK$0.475
/個 (每包:50個)
單位
PNP 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 110-7773
製造零件編號BCV49H6327XTSA1
BrandInfineon
HK$1.265
/個 (每包:100個)
單位
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 827-0008
製造零件編號BCV26E6327HTSA1
BrandInfineon
HK$0.599
個 (在毎卷:500)
單位
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V
RS庫存編號 166-0976
製造零件編號BCV49H6327XTSA1
BrandInfineon
HK$1.101
個 (在毎卷:1000)
單位
NPN 500 mA 60 V 10 V SOT-89 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 445-2095
製造零件編號BCV47E6327HTSA1
BrandInfineon
HK$2.144
/個 (每包:25個)
單位
NPN 500 mA 60 V 10 V SOT-23 Surface Mount 3 - Single 1 2000 1.5 V 80 V 1 V
RS庫存編號 145-9578
製造零件編號BSP61H6327XTSA1
BrandInfineon
HK$1.025
個 (在毎卷:1000)
單位
PNP 1 A 60 V 5 V SOT-223 Surface Mount 3+Tab - Single 1 2000 2.2 V 80 V 1.8 V
RS庫存編號 165-7709
製造零件編號BCV61BE6327HTSA1
BrandInfineon
HK$0.465
個 (在毎卷:3000)
單位
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV
RS庫存編號 752-8079
製造零件編號BCV61BE6327HTSA1
BrandInfineon
HK$0.718
Each (On a Tape of 25)
單位
NPN 100 mA 30 V 6 V SOT-143 Surface Mount 4 - - 2 100 900 mV 30 V 600 mV
RS庫存編號 165-7512
製造零件編號BSP60H6327XTSA1
BrandInfineon
HK$1.078
個 (在毎卷:1000)
單位
PNP 1 A 45 V 5 V SOT-223 Surface Mount 3 + Tab - Single 1 1000 2.2 V 60 V 1.8 V
RS庫存編號 178-7473
製造零件編號BCV26E6327HTSA1
BrandInfineon
HK$0.399
個 (在毎卷:3000)
單位
PNP 500 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 1 20000 1.5 V 40 V 1 V