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MINISMDC125F/16-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 16V 1.25A 1812
- Series：PolySwitch®, miniSMD
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：16V
- Current - Hold (Ih) (Max)：1.25 A
- Current - Trip (It)：2.5 A
- Current - Max：100 A
- Time to Trip：400 ms
- Resistance - Initial (Ri) (Min)：50 mOhms
- Resistance - Post Trip (R1) (Max)：140 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：1812 (4532 Metric), Concave
- Size / Dimension：0.181" L x 0.128" W (4.60mm x 3.24mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.019" (0.48mm)
- Lead Spacing：-
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Overview
The Littelfuse MINISMDC125F/16-2 is a PolySwitch resettable PPTC fuse designed for surface-mount applications. It features a 16 VDC maximum voltage rating and a 1.25 A hold current. The device trips at 2.5 A with a maximum fault current rating of 40 A. Its initial resistance is typically 0.3 Ohms, rising to a maximum of 0.8 Ohms after tripping. The component operates within a temperature range of -40°C to +85°C and dissipates up to 1 W of power. It is housed in a compact 1812 (4532 metric) package.
Feature Summary
- Provides reliable overcurrent protection by increasing resistance when heated during fault conditions
- Offers automatic circuit recovery without manual replacement after the fault is cleared
- Designed for direct surface-mount soldering onto printed circuit boards
Applications
- Protection of portable electronic devices and battery packs
- Overcurrent safeguarding in telecommunications equipment
- Circuit protection for automotive infotainment and sensor modules
Procurement Notes
Verify the specific voltage suffix (/16-2) against the target circuit's operating voltage to ensure adequate margin. Confirm that the 1812 footprint matches the PCB land pattern. Check moisture sensitivity levels if the component has been stored for extended periods before reflow soldering.
Selection Notes
Select this part based on the 1.25 A continuous current requirement and the 16 VDC system limit. Ensure the trip current of 2.5 A aligns with the surge tolerance of downstream components. Consider the thermal environment, as higher ambient temperatures may reduce the effective hold current capability below the nominal rating.
Part Context
This component belongs to the miniSMD series of PolySwitch resettable fuses from Littelfuse. The series provides compact circuit protection solutions suitable for space-constrained designs. It utilizes polymer positive temperature coefficient technology to deliver robust overcurrent defense in small form factors.
Replacement Considerations
Direct substitutes include other 1812 packaged PPTC fuses with matching 1.25 A hold current and 16 VDC ratings. Verify that alternative parts maintain similar trip characteristics and physical dimensions for board compatibility.
