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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 1.35A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：1.35 A
- Current - Trip (It)：2.7 A
- Current - Max：40 A
- Time to Trip：7.3 s
- Resistance - Initial (Ri) (Min)：65 mOhms
- Resistance - Post Trip (R1) (Max)：170 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.350" Dia x 0.118" T (8.90mm x 3.00mm)
- Height - Seated (Max)：0.744" (18.90mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R135-AP-99 is a resettable PPTC (Polymeric Positive Temperature Coefficient) device from the MF-USHT Series, designed for high-temperature applications. It functions as a self-resetting overcurrent protector that increases resistance significantly when exposed to excessive current or heat, thereby limiting current flow to protect downstream components. The 'AP' suffix indicates an adhesive-backed variant for secure mounting, and '99' denotes specific lead termination style. This component serves as a reliable alternative to traditional fuses in circuits requiring repeated overload protection without manual replacement.
Feature Summary
- Self-resetting overcurrent protection mechanism utilizing polymeric positive temperature coefficient technology
- High-temperature capability suitable for demanding thermal environments within the MF-USHT series
- Adhesive-backed design option for secure mechanical attachment to circuit boards
- Eliminates the need for manual fuse replacement after tripping events
Applications
- Automotive electronics requiring AEC-Q200 compliance
- Industrial equipment with high thermal stress
- Consumer electronics needing reusable circuit protection
- Telecommunications infrastructure power lines
Procurement Notes
Verify the exact datasheet version for the MF-R135-AP-99 to confirm voltage ratings and hold current specifications, as these vary by series revision. Ensure the adhesive backing is compatible with your PCB material and soldering process temperatures. Cross-reference the '99' lead code with manufacturer documentation to confirm terminal configuration before integration into final assembly designs.
Selection Notes
Select this component when a reusable overcurrent solution is required in high-temperature environments where traditional fuses are impractical. Consider the MF-USHT series characteristics for superior thermal stability compared to standard PPTC devices. Evaluate the space constraints due to the adhesive backing requirement and ensure the holding current exceeds the normal operating current of the protected circuit to prevent nuisance tripping.
Part Context
This part belongs to Bourns' MF-USHT Series, which expands their portfolio of high-temperature PPTC resettable fuses. These devices are engineered to withstand higher ambient temperatures than standard polymeric fuses, making them suitable for automotive under-hood applications and industrial machinery. The series emphasizes reliability and long-term stability in harsh electrical environments.
Replacement Considerations
Direct replacements must match the hold current, trip current, and maximum voltage ratings of the original component. Verify that any substitute also supports the required high-temperature operation if used in the MF-USHT application context. Adhesive-backed variants may require different mounting considerations compared to standard leaded versions.
