MF-FSMF035X-2 Equivalent & Substitute Parts

Part Overview

The MF-FSMF035X-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 6V maximum voltage with 350 mA hold current. This surface mount component in 0603 (1608 Metric) package format is designed for overcurrent protection in electronic circuits. The part maintains Active product status with full RoHS3 compliance and cURus/TUV certifications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

MF-FSMF035X-2

Bourns Inc.In Stock: 156210MF-FSMF035X-2 Datasheet

Current PartRFQ

0603L035YR

LittelfuseIn Stock: 431640603L035YR Datasheet

DirectRFQ

PTS06036V035

Eaton - Electronics DivisionIn Stock: 6242PTS06036V035 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-FSMF035X-2 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Max: 6V
• Current - Hold (Ih) (Max): 350 mA
• Current - Trip (It): 750 mA
• Package / Case: 0603 (1608 Metric), Concave
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C
• Approval Agencies: cURus and TUV certification

Allowable Variation Parameters:

• Resistance - Initial (Ri) (Min): ±100 mOhms tolerance
• Resistance - Post Trip (R1) (Max): ±0.5 Ohms tolerance
• Physical dimensions (length, width, thickness): ±0.005" tolerance
• Current - Max: ±32 A tolerance
• Packaging format: Cut Tape (CT) or Tape & Reel (TR) interchangeable

Two substitute parts meet these criteria: 0603L035YR (Littelfuse) and PTS06036V035 (Eaton - Electronics Division).

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status with cURus and TUV certifications, meeting regulatory requirements for overcurrent protection applications. The MF-FSMF035X-2 (Bourns) and 0603L035YR (Littelfuse) are functionally equivalent across all critical electrical parameters and both carry ROHS3 compliance documentation.

The PTS06036V035 (Eaton) meets the mandatory electrical specifications for voltage, hold current, trip current, and time to trip. However, it exhibits lower initial resistance (90 mOhms vs. 200 mOhms) and reduced maximum current rating (8 A vs. 40 A). These differences remain within allowable tolerance ranges for substitution but should be evaluated against specific circuit requirements.

Selection between these parts should prioritize inventory availability, lead time, and cost considerations, as all three components satisfy the core functional and compliance criteria for this application.

Frequently Asked Questions (FAQ)

Q: Can 0603L035YR replace MF-FSMF035X-2 in production?

A: Yes. Both parts share identical voltage (6V), hold current (350 mA), trip current (750 mA), time to trip (100 ms), and package specifications (0603 Concave). Both carry cURus/TUV certifications and ROHS3 compliance. Packaging differs (Littelfuse supplies Tape & Reel; Bourns supplies Cut Tape), but both formats are compatible with standard assembly equipment.

Q: What are the key differences between PTS06036V035 and the primary part?

A: The Eaton PTS06036V035 maintains identical voltage, hold current, trip current, and operating temperature specifications. Initial resistance is lower (90 mOhms vs. 200 mOhms), and maximum current rating is reduced (8 A vs. 40 A). These variations fall within acceptable tolerance ranges for substitution but may affect circuit behavior in high-current transient scenarios.

Q: Are all three parts suitable for the same PCB assembly process?

A: Yes. All three components are surface mount devices in 0603 (1608 Metric) concave package format, compatible with standard pick-and-place and reflow soldering processes. Packaging format differences (Cut Tape vs. Tape & Reel) do not affect PCB assembly compatibility.

Q: Which part offers the best compliance documentation?

A: MF-FSMF035X-2 and 0603L035YR both carry explicit ROHS3 compliance statements. PTS06036V035 compliance status is not specified in available documentation. All three parts hold cURus and TUV certifications.

Q: Can these parts be intermixed in inventory?

A: Yes, provided circuit design tolerates the parameter variations noted in the comparison table. For applications sensitive to initial resistance or maximum current specifications, maintain separate inventory streams to prevent substitution errors.