Equivalent & Substitute Parts for 0603SFP300FM/32-2

Part Overview

The 0603SFP300FM/32-2 is a 3A, 32VDC surface mount board mount fuse in 0603 (1608 Metric) package manufactured by Littelfuse Inc. This part is classified as Obsolete, making identification of active equivalent alternatives necessary for ongoing design support and procurement. The fuse is designed for general-purpose circuit protection in compact surface mount applications with a breaking capacity of 50A at rated voltage and operating temperature range of -55°C to 125°C.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (DC)	32 V
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50A
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.03 Ohms
Melting I²t	0.72

Substitute Part Grouping Explanation

Substitution for the 0603SFP300FM/32-2 is based on the following critical parameters that must remain constant:

Current Rating: 3 A (exact match required)
Voltage Rating (DC): 32 V (exact match required)
Package / Case: 0603 (1608 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

Two active substitute parts meet these core electrical and mechanical requirements: SF-0603HI300M-2 (MFR Recommended) and SF-0603S300M-2 (Parametric Equivalent), both manufactured by Bourns Inc. Both parts are classified as Active and available in production quantities.

Parameter Comparison

Parameter	0603SFP300FM/32-2 (Littelfuse)	SF-0603HI300M-2 (Bourns)	SF-0603S300M-2 (Bourns)
Current Rating (Amps)	3 A	3 A	3 A
Voltage Rating - DC	32 V	32 V	32 V
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50A	50A	35A
Melting I²t	0.72	0.72	0.18
DC Cold Resistance	0.03 Ohms	0.03 Ohms	0.025 Ohms
Operating Temperature Range	-55°C to 125°C	-55°C to 150°C	-55°C to 125°C
Response Time	Not specified	Not specified	Slow Blow
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Size / Dimension	0.063" L x 0.031" W x 0.037" H (1.60mm x 0.80mm x 0.95mm)	0.063" L x 0.031" W x 0.031" H (1.60mm x 0.80mm x 0.80mm)	0.063" L x 0.031" W x 0.037" H (1.60mm x 0.80mm x 0.95mm)

Engineering Selection Recommendations

SF-0603HI300M-2 is designated as the MFR Recommended substitute. This part maintains all critical electrical parameters (3A, 32VDC, 50A breaking capacity, 0.72 Melting I²t) and offers an extended operating temperature range (-55°C to 150°C). The part is ROHS3 Compliant and REACH Unaffected, with Active product status and high inventory availability (6081 pcs). The physical height is reduced to 0.031" (0.80mm) compared to the original 0.037" (0.95mm), which may provide PCB layout advantages in space-constrained applications.

SF-0603S300M-2 is a parametric equivalent that maintains core electrical specifications but differs in breaking capacity (35A versus 50A) and melting I²t (0.18 versus 0.72). This part features Slow Blow response time and is also ROHS3 Compliant with Active status. Selection of this part requires confirmation that the reduced breaking capacity and different thermal response characteristics are acceptable for the target application.

Both substitute parts are manufactured by Bourns Inc. and supplied in Tape & Reel packaging. Both maintain UL approval agency certification and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can SF-0603HI300M-2 be used as a direct replacement for 0603SFP300FM/32-2?

A: Yes. SF-0603HI300M-2 maintains all critical electrical parameters: 3A current rating, 32V DC voltage rating, 50A breaking capacity, and 0.72 Melting I²t. The package, mounting type, and fuse classification are identical. The reduced physical height (0.031" versus 0.037") is compatible with standard 0603 footprints.

Q: What is the difference between SF-0603HI300M-2 and SF-0603S300M-2?

A: Both parts share the same current rating (3A) and voltage rating (32V). The primary differences are: SF-0603HI300M-2 has 50A breaking capacity and 0.72 Melting I²t with unspecified response time; SF-0603S300M-2 has 35A breaking capacity, 0.18 Melting I²t, and Slow Blow response time. Selection depends on whether the application requires the higher breaking capacity and thermal characteristics of the HI series.

Q: Are there any physical compatibility concerns with the substitute parts?

A: SF-0603HI300M-2 has a reduced height of 0.031" (0.80mm) compared to the original 0.037" (0.95mm). This is within standard 0603 package tolerance and compatible with existing PCB footprints. SF-0603S300M-2 maintains the original height of 0.037" (0.95mm).

Q: What compliance certifications apply to the substitute parts?

A: Both SF-0603HI300M-2 and SF-0603S300M-2 are ROHS3 Compliant and REACH Unaffected. Both carry UL approval agency certification and EAR99 ECCN classification.

Q: Why is the original 0603SFP300FM/32-2 marked as Obsolete?

A: The original part is no longer in active production. The substitute parts from Bourns Inc. are in Active status with established supply chains and higher inventory availability, making them the recommended alternatives for new designs and ongoing procurement.

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