PFNF.110.2 Polymeric PTC Resettable Fuse 6V 1.1A 1206 Equivalent & Substitute Parts

Part Overview

The PFNF.110.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 6V maximum voltage with 1.1A hold current. This surface mount component in 1206 (3216 Metric) package format is designed for overcurrent protection in electronic circuits. The part is currently active in production with 745 units in stock. Equivalent and substitute parts are identified based on matching voltage rating, package format, and functional current specifications to ensure direct circuit compatibility.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Package / Case	1206 (3216 Metric), Concave
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Type	Polymeric
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the PFNF.110.2 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage rating of 6V maximum
Surface mount 1206 (3216 Metric) package format
Polymeric PTC resettable fuse type
Operating temperature range of -40°C to 85°C

Secondary Compatibility Factors:

Current hold (Ih) rating within acceptable circuit tolerance
Current trip (It) rating proportional to hold current
Initial resistance (Ri) and post-trip resistance (R1) within functional limits
Active product status and regulatory compliance

The substitute parts listed below meet the primary matching criteria and maintain functional equivalence within their specified electrical parameters.

Parameter Comparison

Parameter	PFNF.110.2 (SCHURTER)	NANOSMDC075F-2 (Littelfuse)	NANOSMDC200F-2 (Littelfuse)	PTS12066V110 (Eaton)
Manufacturer	SCHURTER Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division
Voltage - Max	6V	6V	6V	6V
Current - Hold (Ih) (Max)	1.1 A	750 mA	2 A	1.1 A
Current - Trip (It)	2.2 A	1.5 A	4 A	2.2 A
Package / Case	1206 (3216 Metric), Concave	1206 (3216 Metric), Concave	1206 (3216 Metric), Concave	1206 (3216 Metric), Concave
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Resistance - Initial (Ri) (Min)	60 mOhms	90 mOhms	20 mOhms	70 mOhms
Resistance - Post Trip (R1) (Max)	200 mOhms	300 mOhms	72 mOhms	200 mOhms
Time to Trip	300 ms	100 ms	1.5 s	100 ms
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Approval Agency	cURus, TUV	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

Direct Equivalent (Recommended for 1:1 Replacement):

PTS12066V110 (Eaton - Electronics Division) is the closest functional equivalent to PFNF.110.2. Both parts share identical voltage rating (6V), current hold specification (1.1A), current trip rating (2.2A), and post-trip resistance maximum (200 mOhms). Both are active products with cURus and TUV certifications. This part is suitable for direct substitution in applications requiring the same protection characteristics.

Current-Dependent Alternatives:

NANOSMDC075F-2 (Littelfuse Inc.) is suitable for applications requiring lower current protection (750 mA hold current). This part features faster trip time (100 ms versus 300 ms) and is certified by CSA, TUV, and UL. Use this substitute only when circuit design permits lower hold current operation.

NANOSMDC200F-2 (Littelfuse Inc.) is suitable for applications requiring higher current capacity (2A hold current). This part has extended trip time (1.5 s) and lower initial resistance (20 mOhms). Use this substitute only when circuit design requires higher current handling.

All substitute parts maintain the same 1206 package format, surface mount configuration, and -40°C to 85°C operating temperature range as the original PFNF.110.2.

Frequently Asked Questions (FAQ)

Q: Can NANOSMDC075F-2 be used as a direct replacement for PFNF.110.2?

A: NANOSMDC075F-2 shares the same 6V voltage rating and 1206 package format but has a lower hold current rating of 750 mA compared to 1.1A. This part is suitable only if your circuit design operates at or below 750 mA. The faster trip time (100 ms) may also affect circuit behavior.

Q: What is the difference between NANOSMDC200F-2 and PFNF.110.2?

A: Both parts are 6V rated in 1206 packages. NANOSMDC200F-2 has a higher hold current (2A versus 1.1A) and longer trip time (1.5s versus 300 ms). Use NANOSMDC200F-2 only if your application requires higher current protection and can tolerate extended response time.

Q: Is PTS12066V110 a true equivalent to PFNF.110.2?

A: Yes. PTS12066V110 matches PFNF.110.2 in voltage (6V), hold current (1.1A), trip current (2.2A), and post-trip resistance (200 mOhms maximum). Both are active products with equivalent regulatory certifications. This is the recommended substitute for direct replacement.

Q: Do all substitute parts have the same package dimensions?

A: All substitute parts use the 1206 (3216 Metric) concave package format with surface mount configuration. Minor thickness variations exist: PFNF.110.2 is 0.028" (0.70mm), NANOSMDC075F-2 is 0.027" (0.68mm), NANOSMDC200F-2 is 0.043" (1.10mm), and PTS12066V110 is 0.035" (0.88mm). Verify PCB assembly clearance for NANOSMDC200F-2 due to increased thickness.

Q: What certifications do the substitute parts carry?

A: PFNF.110.2 and PTS12066V110 carry cURus and TUV certifications. NANOSMDC075F-2 and NANOSMDC200F-2 carry CSA, TUV, and UL certifications. All parts are RoHS compliant and REACH unaffected.

Q: Can I use NANOSMDC075F-2 and NANOSMDC200F-2 interchangeably?

A: No. These parts have different current ratings (750 mA and 2A respectively) and trip characteristics. Selection must be based on your specific circuit protection requirements. Using an incorrect rating may result in inadequate or excessive protection.

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