Product Overview
Littelfuse POLY-FUSE LoRho 1210 Resettable Fuse, 3.5 A Hold, 7.0 A Trip, 6 V
Condition
Unused new old stock (NOS). Sold each. Markings legible: -T.
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Product Overview
Littelfuse 1210L350SL-SYR is a surface-mount polymeric PTC (PPTC) resettable fuse from the POLY-FUSE LoRho series, in a 1210 chip. It carries 3.5 A continuously, trips at 7.0 A, and returns to low resistance once the fault is cleared and it cools, so the board needs no fuse change after a short.
Key Features
- Hold current 3.50 A; trip current 7.00 A
- Maximum voltage 6 Vdc; maximum fault current 50 A
- Maximum time to trip 2.00 s at 17.50 A
- Resistance 0.003 ohm minimum; R1max 0.018 ohm
- Typical power dissipation 0.8 W
- 1210 surface-mount chip, marked -T, the Littelfuse marking code for the 1210L350SL
Applications
- Placed in series with a 5 V USB or VBUS output that supplies up to 3.5 A, so a shorted cable trips the line instead of the regulator
- Guarding a low-voltage battery or motor-driver feed where a stall or pinched wire should cut current and then recover
- Replacing a cooked 1210L350SL on a board under repair, on the same 1210 footprint
- Maker builds: a self-resetting fuse ahead of LED strips or microcontroller boards on a 5 V supply
Frequently Asked Questions
Does it reset after it trips?
Yes. A PPTC stays tripped while the fault holds it hot. Clear the fault or remove power, and it cools back to low resistance.
Can it go on a 12 V rail?
No. The maximum rating is 6 Vdc, which suits 5 V and lower rails.
Will it drop onto a 1206 footprint?
No. It is a 1210 chip, wider than a 1206, so it needs 1210 pads.
A PPTC fuse is a sliver of conductive polymer that swells apart when a fault heats it and knits back together as it cools: a fuse whose job is to blow and come back. Solder it in ahead of the feed it guards.
