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 165-7512
製造零件編號BSP60H6327XTSA1
BrandInfineon
TWD4.70
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 866-0196
製造零件編號ULN2803ADW
TWD29.50
毎管:40 個
單位
NPN 500 mA 50 V - SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS庫存編號 646-6311
製造零件編號ULN2803ADW
TWD41.60
/個 (每包:5個)
單位
NPN 500 mA 50 V 50 V SOIC Surface Mount 18 - Common Emitter 8 - - - 1.6 V
RS庫存編號 752-8205
製造零件編號BSP60H6327XTSA1
BrandInfineon
TWD4.70
/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 177-5536
製造零件編號A2982SLWTR-T
TWD73.80
個 (在毎卷:1000)
單位
NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS庫存編號 680-7220
製造零件編號A2982SLWTR-T
TWD67.40
/個 (每包:5個)
單位
NPN + PNP 500 mA 50 V - SOIC W Surface Mount 20 - - 8 - - - 2 V
RS庫存編號 807-4731
製造零件編號MMBTA28
TWD5.20
Each (On a Tape of 50)
單位
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS庫存編號 166-2225
製造零件編號MMBTA28
TWD2.60
個 (在毎卷:3000)
單位
NPN 800 mA 80 V 12 V SOT-23 Surface Mount 3 - Single 1 10000 - 80 V 1.5 V
RS庫存編號 168-6447
製造零件編號ULN2804A
TWD19.30
毎管:20 個
單位
- - 50 V - PDIP Through Hole 18 - - - - - - -
RS庫存編號 145-2940
製造零件編號NJD35N04G
TWD20.10
毎管:75 個
單位
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS庫存編號 686-8199
製造零件編號ULN2804A
TWD29.80
/個 (每包:10個)
單位
NPN 0.5 A 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.6 V
RS庫存編號 805-4412
製造零件編號NJD35N04G
TWD21.20
/個 (每包:25個)
單位
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 300 2 V 700 V 1.5 V
RS庫存編號 168-6450
製造零件編號ULN2003A
TWD7.70
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 725-8467
製造零件編號BSP51,115
BrandNexperia
TWD16.50
/個 (每包:10個)
單位
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 686-8209
製造零件編號ULN2003A
TWD12.60
/個 (每包:20個)
單位
NPN 500 mA 50 V - PDIP Through Hole 16 - Common Emitter 7 1000 - - 1.6 V
RS庫存編號 163-0785
製造零件編號NJD35N04T4G
TWD12.60
個 (在毎卷:2500)
單位
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS庫存編號 806-5046
製造零件編號NJD35N04T4G
TWD22.20
Each (On a Tape of 25)
單位
NPN 4 A 350 V 5 V DPAK (TO-252) Surface Mount 3 - Single 1 2000 2 V 700 V 1.5 V
RS庫存編號 166-0488
製造零件編號BSP61,115
BrandNexperia
TWD7.90
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 725-8461
製造零件編號BSP61,115
BrandNexperia
TWD16.50
/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 714-1167
製造零件編號ULN2803A
TWD31.60
/個 (每包:5個)
單位
NPN 500 mA 50 V 50 V PDIP Through Hole 18 - Common Emitter 8 1000 - - 1.1 V