PFRA.110 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFRA.110 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 30V maximum voltage with a 1.1 A hold current. This through-hole radial disc component provides overcurrent protection with automatic reset capability after fault conditions are cleared. The part is active in production and widely used in electronic circuit protection applications. Substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining identical electrical and mechanical specifications.

Substiute Parts

PFRA.110

SCHURTER Inc.In Stock: 1038PFRA.110 Datasheet

Current PartRFQ

MF-R110

Bourns Inc.In Stock: 4323MF-R110 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PFRA.110 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match Exactly):

• Voltage - Max: 30V
• Current - Hold (Ih) (Max): 1.1 A
• Current - Trip (It): 2.2 A
• Current - Max: 40 A
• Time to Trip: 6.6 s
• Resistance - Initial (Ri) (Min): 100 mOhms
• Resistance - Post Trip (R1) (Max): 270 mOhms
• Operating Temperature Range: -40°C ~ 85°C

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Size / Dimension: 0.350" Dia x 0.118" T (8.90mm x 3.00mm)
• Lead Spacing: 0.201" (5.10mm)

Component Type:

• Polymeric PTC Resettable Fuse

The MF-R110 manufactured by Bourns Inc. meets all specified electrical and mechanical parameters and qualifies as a direct parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the PFRA.110 and MF-R110 are active production components with identical electrical and mechanical specifications. Selection between these parts may be based on:

Product Status: Both parts maintain active production status, ensuring long-term availability and supply chain stability.

Regulatory Compliance: Both components carry cURus and TUV approvals, meeting international safety standards. Both are ROHS3 compliant and REACH unaffected, satisfying environmental and regulatory requirements for industrial and consumer applications.

Inventory Availability: The MF-R110 (Bourns) currently maintains higher inventory levels (4300 pcs) compared to the PFRA.110 (937 pcs), which may influence sourcing decisions based on project timelines and volume requirements.

Certification Alignment: Identical approval agencies and compliance certifications ensure that either part can be used in applications requiring specific regulatory documentation or third-party validation.

Frequently Asked Questions (FAQ)

Q: Can the MF-R110 be used as a direct replacement for the PFRA.110 in existing designs?

A: Yes. The MF-R110 matches all electrical parameters (voltage, current ratings, trip characteristics, resistance values, and operating temperature range) and all mechanical parameters (through-hole mounting, radial disc package, physical dimensions, and lead spacing). No circuit modifications are required.

Q: Are there any differences in performance characteristics between these parts?

A: No. Both components are polymeric PTC resettable fuses with identical hold current (1.1 A), trip current (2.2 A), time to trip (6.6 s), and resistance specifications. Performance in circuit protection applications is equivalent.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the PFRA.110 and MF-R110 carry cURus and TUV approvals. Both are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

Q: What is the difference in moisture sensitivity between these parts?

A: The PFRA.110 lists moisture sensitivity as not applicable. The MF-R110 is rated MSL 1 (Unlimited), indicating no moisture-related handling restrictions. This difference does not affect electrical or mechanical compatibility.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Identical physical dimensions (0.350" diameter x 0.118" thickness), lead spacing (0.201"), and through-hole radial disc package ensure mechanical and electrical interchangeability in PCB designs without layout modifications.

Q: What factors should influence the choice between PFRA.110 and MF-R110?

A: Selection may be based on supplier availability, inventory levels, lead times, and cost. Both parts are functionally and mechanically identical. The MF-R110 currently has higher inventory availability (4300 pcs vs. 937 pcs).