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Product Detailed Parameters
- Description：PTC RESET FUSE 265V 35MA RADIAL
- Series：YP
- Mfr：Amphenol Advanced Sensors (Thermometrics)
- Package：Strip
- Type：Ceramic
- Voltage - Max：265V
- Current - Hold (Ih) (Max)：35 mA
- Current - Trip (It)：80 mA
- Current - Max：400 mA
- Time to Trip：-
- Resistance - Initial (Ri) (Min)：-
- Resistance - Post Trip (R1) (Max)：-
- Resistance - 25°C (Typ)：120 Ohms
- Operating Temperature：0°C ~ 60°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.256" Dia x 0.197" T (6.50mm x 5.00mm)
- Height - Seated (Max)：0.472" (12.00mm)
- Thickness (Max)：-
- Lead Spacing：0.236" (6.00mm)
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Overview
The YQS8121 is a ceramic PTC resettable fuse manufactured by Amphenol Advanced Sensors (Thermometrics). It features a radial, disc package designed for through-hole mounting. The component has a voltage rating of 265V and a hold current of 35 mA. Its resistance at 25°C is 120 ohms with a tolerance of +/-20%. The device operates within a temperature range of 0°C to 60°C and measures 0.256 inches in diameter by 0.197 inches in thickness.
Feature Summary
- Utilizes ceramic PTC technology for overcurrent protection
- Provides automatic reset functionality after fault clearance
- Designed for direct through-hole PCB integration
Applications
- Consumer electronics circuit protection
- Industrial control system safeguarding
- Power supply input filtering
Procurement Notes
Verify the specific hold current rating of 35 mA and resistance value of 120 ohms against design requirements. Confirm the 265V rating aligns with the target circuit voltage. Ensure the radial disc package dimensions fit the available PCB space. Check for RoHS compliance status if required by project specifications.
Selection Notes
Select this component when automatic reset capability is preferred over one-time fuses. Consider the 35 mA hold current limit to ensure normal operation without nuisance tripping. Evaluate the 0-60°C operating range against environmental conditions. The ceramic construction offers stability compared to polymer types.
Part Context
This part belongs to the Thermometrics PTC thermistor family, which specializes in resettable fuses for electronic circuits. These components serve as alternative protection devices to traditional fusible links, offering repeated use after temporary overcurrent events. The series supports various current and voltage ratings for diverse applications.
Replacement Considerations
Cross-reference with other 35 mA, 265V PTC resettable fuses from manufacturers like Bourns or Littelfuse. Ensure equivalent hold current, trip current, and maximum voltage ratings are met. Verify that the replacement maintains the same radial disc form factor for mechanical compatibility.
