PFMU.110.2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFMU.110.2 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 6V at 1.1A hold current in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The PFMU series has been superseded by active product lines, requiring engineers to evaluate compatible alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Current - Max	40 A
Resistance - Initial (Ri) (Min)	50 mOhms
Resistance - Post Trip (R1) (Max)	210 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Type	Polymeric
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PFMU.110.2 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Voltage rating: 6V maximum
Current hold (Ih): 1.1A maximum
Current trip (It): 2.2A
Resistance initial (Ri): 50 mOhms minimum
Resistance post-trip (R1): 210 mOhms maximum
Operating temperature range: -40°C to 85°C

Mechanical Parameters (Must Match):

Package type: 1210 (3225 Metric) surface mount
Polymeric PTC fuse construction

Compliance Parameters:

RoHS3 compliance required
REACH unaffected status

The PFUF.110.2 meets all critical electrical and mechanical requirements for direct substitution. Differences in time-to-trip specification (100 ms vs. 1 s) and packaging format (bulk vs. tape & reel) do not affect functional equivalence in circuit protection applications where the hold current and trip current thresholds are the primary design criteria.

Parameter Comparison

Parameter	PFMU.110.2 (Main Part)	PFUF.110.2 (Substitute)	Match Status
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Identical
Type	Polymeric	Polymeric	Identical
Voltage - Max	6V	6V	Identical
Current - Hold (Ih) (Max)	1.1 A	1.1 A	Identical
Current - Trip (It)	2.2 A	2.2 A	Identical
Current - Max	40 A	40 A	Identical
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	Identical
Resistance - Post Trip (R1) (Max)	210 mOhms	210 mOhms	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	1210 (3225 Metric)	1210 (3225 Metric), Concave	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The PFUF.110.2 is the direct substitute for the obsolete PFMU.110.2. Both components are manufactured by SCHURTER Inc. and maintain identical electrical specifications across all critical protection parameters. The PFUF.110.2 carries active product status, ensuring long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production. The PFUF.110.2 is available in tape & reel packaging format, which is standard for automated assembly operations, whereas the PFMU.110.2 was supplied in bulk format.

The concave package variant of the PFUF.110.2 is mechanically compatible with 1210 (3225 Metric) footprints and does not require PCB layout modifications. Selection of the PFUF.110.2 eliminates obsolescence risk while maintaining full functional equivalence in circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can PFUF.110.2 be used as a direct replacement for PFMU.110.2 on existing PCBs?

A: Yes. The PFUF.110.2 is electrically and mechanically equivalent to the PFMU.110.2. Both components share identical voltage, current hold, current trip, and resistance specifications. The 1210 (3225 Metric) surface mount footprint is identical, and the concave package variant does not affect PCB compatibility.

Q: What is the difference between the PFMU and PFUF series?

A: The PFMU series is obsolete, while the PFUF series is the active product line from SCHURTER Inc. Both series use identical polymeric PTC fuse technology and electrical ratings. The primary difference is product status and packaging availability, with PFUF.110.2 supplied in tape & reel format for automated assembly.

Q: Are there differences in time-to-trip between PFMU.110.2 and PFUF.110.2?

A: Yes. The PFMU.110.2 specifies 100 ms time-to-trip, while the PFUF.110.2 specifies 1 s time-to-trip. Both values fall within acceptable ranges for polymeric PTC fuse operation. The hold current (1.1A) and trip current (2.2A) thresholds remain identical and determine circuit protection behavior.

Q: What packaging formats are available for each part?

A: The PFMU.110.2 was supplied in bulk packaging. The PFUF.110.2 is supplied in tape & reel (TR) format, which is standard for high-volume automated assembly. Tape & reel packaging does not affect electrical performance or PCB compatibility.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both PFMU.110.2 and PFUF.110.2 are ROHS3 compliant and REACH unaffected. The PFMU.110.2 carries CSA, TUV, and UL approvals. The PFUF.110.2 carries cURus and TUV approvals. Both meet the regulatory requirements for circuit protection applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message