ULN2804A 8-Channel Darlington Transistor Array DIP-18
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Prices updated: 13 Oct 2026
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About this product
The ULN2804A is an array of 8 Darlington transistor pairs in an 18-pin DIP package, designed to drive relays, lamps, solenoids and other high-power loads up to 500 mA and 50 V. It is commonly used to interface microcontroller outputs with heavier loads, and each channel includes a clamp diode for inductive loads.
Specifications
- Channels
- 8 Darlington pairs / 8 أزواج دارلنغتون
- Output current
- Up to 500 mA per channel
- Output voltage
- Up to 50 V
- Input type
- 6–15 V CMOS/PMOS compatible / متوافق مع CMOS/PMOS بجهد 6 إلى 15 V
- Package
- 18-pin DIP
- Protection
- Clamp diodes for inductive loads / ثنائيات حماية للأحمال الحثية
Frequently asked questions
Which ULN part should I choose for 5V logic?
The ULN2804A is for 6–15V CMOS/PMOS logic. For 5V TTL logic, use the ULN2803A.
How do I wire a relay to one channel?
Connect the relay coil between the positive supply and the channel's output pin, and connect the COM pin to the same supply so the internal clamp diodes protect against back-EMF.
