TLP521-1 Optocoupler Phototransistor DIP-4
Prices updated: 13 Oct 2026
Compare prices
| Store | product | Price | View in store |
|---|---|---|---|
 Makers ElectronicsCheapest | TLP521-1 Optocoupler DIP-4 | 15 EGP | View in store |
 Circuits Electronics | TLP521-1 (Optocoupler) | 18 EGP | View in store |
Price history
Lowest daily price, last 90 days
Lowest price recorded: 15 EGP
About this product
The TLP521-1 is a single-channel optocoupler that pairs a gallium arsenide infrared LED with a phototransistor in a 4-pin DIP package. It provides galvanic isolation between circuits and is used in switch-mode power supply feedback, relay driver boards and other designs that need separated grounds.
Specifications
- Channels
- 1
- Emitter
- GaAs infrared LED
- Output
- Phototransistor
- Package
- DIP-4
Frequently asked questions
What is the price of TLP521-1 Optocoupler Phototransistor DIP-4 in Egypt?
TLP521-1 Optocoupler Phototransistor DIP-4 currently costs between 15 and 18 EGP across 2 offers in Egypt.
Where can I buy TLP521-1 Optocoupler Phototransistor DIP-4 in Egypt?
TLP521-1 Optocoupler Phototransistor DIP-4 is available from Makers Electronics and Circuits Electronics. Compare the offers above to find the best price.
How do I drive the LED side from a microcontroller?
Connect the microcontroller output to pin 1 (anode) through a series resistor, and connect pin 2 (cathode) to ground. Size the resistor for the LED current you need.
Does the output need a pull-up resistor?
Yes. The phototransistor output needs a pull-up resistor from the supply to pin 4 to produce a logic-high level. Pin 3 (emitter) goes to ground for a low-side output.
