500 mA hold, 1 A trip — the protection threshold and why it matters
The 0603L050SLYR holds 500 mA continuously without tripping; above that, at 1 A (the trip current), the internal polymer heats and switches to a high-resistance state, limiting the fault current to a safe level. Initial resistance is a minimum 70 mOhms; after tripping it rises to a maximum 350 mOhms. The low R reduces I²R loss in normal operation — on a 500 mA rail the voltage drop is roughly 35 mV at the start of life. Time to trip is 100 ms — fast enough to protect downstream silicon from sustained overcurrent but slow enough to ignore inrush from a bypass capacitor bank.
6 V max, 0603 SMD — where this part fits on the board
Rated for 6 V maximum continuous voltage — use it on 3.3 V, 5 V, or battery-protected rails where the rail never exceeds 6 V. The 0603 concave package (1.60 mm x 0.80 mm, 0.75 mm thick) matches the standard 0603 footprint; the concave termination style improves solder-joint reliability under thermal cycling compared to a flat termination.
Active production, cURus/TUV — sourcing reality
Approved by cURus and TUV — accepted in equipment sold into North America and the EU without additional component-level safety testing.