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Product Detailed Parameters
- Description：PTC RESETTABLE 1.85A 30V RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：1.85 A
- Current - Trip (It)：3.7 A
- Current - Max：40 A
- Time to Trip：8.7 s
- Resistance - Initial (Ri) (Min)：40 mOhms
- Resistance - Post Trip (R1) (Max)：110 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：Automotive
- Qualification：AEC-Q200
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.472" Dia x 0.118" T (12.00mm x 3.00mm)
- Height - Seated (Max)：0.724" (18.40mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R185-AP-17 is a radial leaded PTC resettable fuse from the Multifuse MF-R series. It features a hold current of 1.85 A and a trip current of 3.7 A at 25°C. The device supports a maximum voltage of 30 VDC and can withstand a maximum fault current of 40 A. Initial resistance ranges from 40 mΩ to 70 mΩ, with a post-trip resistance up to 110 mΩ. It operates within a temperature range of -40°C to +85°C and utilizes a 5.1 mm lead spacing for PCB mounting.
Feature Summary
- Provides automatic circuit protection by increasing resistance during overcurrent events
- Self-resetting functionality eliminates the need for manual replacement after fault clearance
- Radial through-hole construction facilitates standard PCB integration
Applications
- Overcurrent protection in consumer electronics power supplies
- Circuit safeguarding in office machines and peripherals
- Protection for telecommunications equipment interfaces
- Surge and overload defense in industrial instrumentation
Procurement Notes
Verify the specific suffix AP-17 against official Bourns documentation to confirm exact packaging and marking variations. Ensure the selected variant matches the required hold and trip currents for the target application. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Cross-reference the datasheet for thermal derating curves relevant to the operating environment.
Selection Notes
Select this component when a low-resistance, high-current resettable fuse is required for 30V DC circuits. The 1.85A hold current suits moderate load protection scenarios. Verify that the 40A maximum fault current rating exceeds potential surge levels. Consider the 5.1mm lead spacing for board layout compatibility. Evaluate thermal dissipation requirements given the 1W power dissipation limit.
Part Context
This part belongs to the Bourns Multifuse MF-R series of polymer PTC devices. These components are designed for surface mount or through-hole applications requiring reliable overcurrent protection. The series offers various hold current options and voltage ratings to suit diverse electronic designs across automotive, industrial, and consumer sectors.
Replacement Considerations
Consult official Bourns substitution guides for verified equivalents. Generic PTC fuses may differ in trip characteristics or recovery times. Ensure any substitute maintains the 30VDC rating and 1.85A hold current specifications.
