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MICROSMD190LR-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 6V 1.9A 1210
- Series：PolySwitch®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：6V
- Current - Hold (Ih) (Max)：1.9 A
- Current - Trip (It)：4.9 A
- Current - Max：50 A
- Time to Trip：4 s
- Resistance - Initial (Ri) (Min)：6 mOhms
- Resistance - Post Trip (R1) (Max)：-
- Resistance - 25°C (Typ)：-
- Operating Temperature：-
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：1210 (3225 Metric), Concave
- Size / Dimension：0.127" L x 0.102" W (3.22mm x 2.58mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.039" (1.00mm)
- Lead Spacing：-
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Overview
The MICROSMD190LR-2 is a surface-mount polymeric positive temperature coefficient (PPTC) resettable fuse from the Littelfuse microSMD Low Rho series. It features a hold current of 190 mA and a trip current of 400 mA, rated for a maximum voltage of 6 VDC. The component exhibits a low initial resistance range of 35 to 75 milliohms and a high breaking capacity of 50 A. Designed for PCB mounting in an 0603 package, it operates within a temperature range of -40°C to +80°C and dissipates up to 1 W of power.
Feature Summary
- Low resistance design minimizes power loss and heat generation during normal operation
- Compact surface-mount footprint enables efficient space utilization on dense circuit boards
- High fault current interruption capability provides robust protection against short circuits
Applications
- Portable electronic devices requiring overcurrent protection
- USB peripheral ports and data interfaces
- Battery-powered consumer electronics
Procurement Notes
Verify the specific suffix 'LR' confirms the low-resistance variant distinct from standard microSMD parts. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure the 6VDC rating aligns with your circuit's maximum operating voltage to prevent premature tripping or failure under surge conditions.
Selection Notes
Select this component when low impedance is critical to maintain signal integrity or efficiency in low-voltage applications. The 190 mA hold current suits moderate load protection needs. Consider the 0603 package size constraints and verify that the 50 A interrupt rating exceeds the prospective fault current available at the installation point on the PCB.
Part Context
This part belongs to the microSMD Low Rho family, which offers reduced resistance compared to standard microSMD fuses. It serves as a reusable alternative to single-use fuses in compact electronics. The product is manufactured by Littelfuse Inc., a recognized provider of circuit protection solutions for various industrial and consumer markets.
Replacement Considerations
MICROSMD190F-2
FAQ
What is the maximum voltage rating for this device?
The MICROSMD190LR-2 has a maximum working voltage of 6 VDC.
Does this fuse fail open or short upon excessive stress?
As a PPTC device, it increases resistance significantly to limit current but does not typically fail open like a traditional fuse unless subjected to extreme thermal abuse beyond its specifications.
