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 484-2707
製造零件編號BST52,115
BrandNexperia
HK$5.13
/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 122-2358
製造零件編號FCX605TA
HK$2.10
個 (在毎卷:1000)
單位
NPN 1 A 120 V 10 V SOT-89 Surface Mount 3 - Single 1 5000 1.8 V 140 V 1.5 V
RS庫存編號 671-1122
製造零件編號BCV26
HK$1.219
/個 (每包:25個)
單位
PNP 1.2 A 30 V 10 V SOT-23 Surface Mount 3 - Single 1 4000 1.5 V 40 V 1 V
RS庫存編號 601-1416
製造零件編號2SB1481(Q)
BrandToshiba
HK$6.65
/個 (每包:5個)
單位
PNP 4 A 100 V 5 V TO-220 Through Hole 3 - - 1 1000 2 V 100 V 1.5 V
RS庫存編號 781-4279
製造零件編號MMBTA13LT1G
HK$0.515
/個 (每包:100個)
單位
NPN 300 mA 30 V 10 V SOT-23 Surface Mount 3 - Single 2 5000 1.5 V 30 V 1.5 V
RS庫存編號 170-2438
製造零件編號2SB1316TL
BrandROHM
HK$2.591
個 (在毎卷:2500)
單位
PNP 2 A 100 V 8 V SC-63 Surface Mount 3 - Single 1 1000 - 100 V 1.5 V
RS庫存編號 781-4253
製造零件編號MMBT6427LT1G
HK$0.528
Each (On a Tape of 100)
單位
NPN 500 mA 40 V 12 V SOT-23 Surface Mount 3 - Single 2 10000 2 V 40 V 1.5 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 790-5482
製造零件編號TIP111G
HK$4.113
/個 (每包:10個)
單位
NPN 2 A 80 V 5 V TO-220 Through Hole 3 - Single 1 500 - 80 V 2.5 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)
單位
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 145-3140
製造零件編號MMBTA64LT1G
HK$0.225
個 (在毎卷:3000)
單位
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS庫存編號 922-7923
製造零件編號ZTX601B
HK$3.215
個 (以毎袋:4000)
單位
NPN 1 A 160 V 10 V E-Line Through Hole 3 - Single 1 5000 1.9 V 180 V 1.2 V
RS庫存編號 633-672
製造零件編號ULN2075B
HK$25.13
單位
NPN 1.75 A 80 V - PDIP Through Hole 16 - Common Emitter 4 - - - 1.5 V
RS庫存編號 168-5782
製造零件編號BDX34C
BrandMagnatec
HK$2.054
毎管:50 個
單位
PNP 10 A 100 V - TO-220 Through Hole 3 - Single 1 750 - 100 V 2.5 V
RS庫存編號 163-0839
製造零件編號2N6040G
HK$3.324
毎管:50 個
單位
PNP 8 A 60 V 5 V TO-220AB Through Hole 3 - Single 1 100 4.5 V 60 V 2 V
RS庫存編號 168-6446
製造零件編號ULQ2804A
HK$7.386
毎管:20 個
單位
NPN 500 mA 50 V - PDIP Through Hole 18 - Common Emitter 8 - - - 1.6 V
RS庫存編號 781-4294
製造零件編號MMBTA64LT1G
HK$0.364
/個 (每包:100個)
單位
PNP -500 mA 30 V -10 V SOT-23 Surface Mount 3 - Single 2 5000 - -30 V -1.5 V
RS庫存編號 774-3439
製造零件編號2N6045G
HK$4.942
/個 (每包:5個)
單位
NPN 8 A 100 V 5 V TO-220AB Through Hole 3 - Single 1 100 4.5 V 100 V 2 V
RS庫存編號 826-8396
製造零件編號2SB852KT146B
BrandROHM
HK$2.598
/個 (每包:30個)
單位
PNP -300 mA 32 V -6 V SMT Surface Mount 3 - Single 1 5000 -1.5 V -40 V -1.5 V
RS庫存編號 128-8847
製造零件編號BA12003B
BrandROHM
HK$4.867
/個 (每包:10個)
單位
NPN - 60 V - DIP Through Hole 16 Array 7 Common Emitter 7 1000 - - 1.6 V