PFNF.200.2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFNF.200.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 6V maximum voltage with a 2A hold current. This surface mount component in 1206 package format provides overcurrent protection with automatic recovery capability. The part is active in production and ROHS3 compliant, making it suitable for modern electronic applications requiring resettable protection without component replacement.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting the same mechanical and environmental requirements.

Substiute Parts

PFNF.200.2

SCHURTER Inc.In Stock: 1819PFNF.200.2 Datasheet

Current PartRFQ

NANOSMDC075F-2

Littelfuse Inc.In Stock: 55451NANOSMDC075F-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PFNF.200.2 is determined by the following criteria:

• Voltage rating must equal or exceed 6V maximum
• Package and mounting type must be identical: Surface Mount, 1206 (3216 Metric), Concave
• Operating temperature range must encompass -40°C to 85°C
• RoHS compliance status must be maintained at ROHS3 level or equivalent
• Polymeric PTC resettable fuse type classification

The NANOSMDC075F-2 from Littelfuse Inc. meets these mechanical and environmental criteria. However, the current ratings differ: hold current is 750mA versus 2A, and trip current is 1.5A versus 4A. This substitute is applicable only in circuits where the lower current thresholds are acceptable for the protection scheme.

Parameter Comparison

Engineering Selection Recommendations

Both parts maintain ROHS3 compliance and operate across the identical temperature range of -40°C to 85°C. The PFNF.200.2 carries cURus and TUV approvals, while the NANOSMDC075F-2 carries CSA, TUV, and UL approvals. Selection between these parts depends on circuit current requirements and approval agency requirements for the end application.

The PFNF.200.2 is appropriate for circuits requiring 2A hold current protection. The NANOSMDC075F-2 is appropriate for circuits requiring 750mA hold current protection. The lower trip time of the NANOSMDC075F-2 (100ms versus 1s) results in faster fault response.

Frequently Asked Questions (FAQ)

Q: Can NANOSMDC075F-2 directly replace PFNF.200.2 in any application?

A: Direct replacement is limited to applications where the circuit current does not exceed 750mA hold current. The NANOSMDC075F-2 has a lower hold current rating (750mA vs 2A) and lower trip current (1.5A vs 4A), making it unsuitable for circuits designed around the higher current specifications of the PFNF.200.2.

Q: Are the package dimensions identical between these parts?

A: Both parts use the 1206 (3216 Metric) Concave package with identical length and width (0.126" L x 0.063" W / 3.20mm x 1.60mm). The NANOSMDC075F-2 has a reduced thickness of 0.027" (0.68mm) compared to the PFNF.200.2 at 0.043" (1.10mm), which may affect PCB layout considerations.

Q: What are the compliance differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. The PFNF.200.2 holds cURus and TUV certifications. The NANOSMDC075F-2 holds CSA, TUV, and UL certifications. Application requirements may dictate which certification set is necessary.

Q: How do the resistance characteristics differ?

A: The PFNF.200.2 has lower initial resistance (20mOhms minimum vs 90mOhms) and lower post-trip resistance (85mOhms maximum vs 300mOhms). Lower resistance values result in reduced power dissipation during normal operation and fault conditions.

Q: What is the significance of the different trip times?

A: The PFNF.200.2 has a 1-second trip time, while the NANOSMDC075F-2 has a 100-millisecond trip time. Faster trip response provides quicker fault isolation but may be incompatible with circuits designed to tolerate the longer response time of the original part.