Littelfuse 0441005.WR Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0441005.WR is a 5A, 32VDC fast-blow surface mount fuse in 0603 (1608 Metric) package format, designed for board-level circuit protection. This component is classified as Active product status with full RoHS3 compliance and CSA/UL approval certifications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set, enabling component sourcing flexibility while preserving circuit protection characteristics.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating - DC	32 V
Response Time	Fast Blow
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 ~ 150°C

Substitute Part Grouping Explanation

Substitute parts for the 0441005.WR are qualified based on the following mandatory parameters:

Current Rating: 5 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)
Response Time: Fast Blow (exact match required)
Operating Temperature Range: -55°C ~ 150°C (exact match required)

The identified substitutes maintain these core electrical and mechanical specifications. Variations in AC voltage rating, melting I²t characteristics, and DC cold resistance are permitted within the substitute group when DC voltage and current ratings remain constant.

Parameter Comparison

Parameter	0441005.WR	0441005.WRA	0438005.WRGT
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	5 A	5 A	5 A
Voltage Rating - DC	32 V	32 V	32 V
Voltage Rating - AC	—	—	12 V
Response Time	Fast Blow	Fast Blow	Fast Blow
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	50A AC, 50A DC
Melting I²t	1.6287	1.6287	0.747
DC Cold Resistance (Ohms)	0.0073	0.0073	0.0127
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Approval Agency	CSA, UL	CE, cURus	CSA, cURus
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Series	441	441A	438GT
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and environmental regulatory adherence.

The 0441005.WR and 0441005.WRA are functionally identical in electrical performance, with matching melting I²t (1.6287) and DC cold resistance (0.0073 Ohms). The primary distinction is certification scope: 0441005.WR carries CSA and UL approvals, while 0441005.WRA carries CE and cURus approvals. Selection between these two should be based on regional regulatory requirements and certification acceptance criteria for the end application.

The 0438005.WRGT provides an alternative with identical DC voltage and current ratings but includes AC voltage rating (12V AC) and differs in thermal characteristics (melting I²t of 0.747 versus 1.6287). This part is suitable for applications requiring dual AC/DC voltage protection. Certification coverage includes CSA and cURus approvals.

Frequently Asked Questions (FAQ)

Q: Can 0441005.WRA be used as a direct replacement for 0441005.WR?

A: Yes. Both parts share identical electrical specifications (5A, 32VDC, Fast Blow), mechanical package (0603), and thermal characteristics (melting I²t 1.6287, DC cold resistance 0.0073 Ohms). The difference lies in certification bodies: 0441005.WR is CSA/UL certified, while 0441005.WRA is CE/cURus certified. Substitution is valid when the application's certification requirements accept the alternative approval agencies.

Q: Is 0438005.WRGT compatible with the same circuit board layout as 0441005.WR?

A: Yes. Both parts use identical 0603 (1608 Metric) surface mount packaging and footprint. However, 0438005.WRGT has different thermal response characteristics (melting I²t 0.747 versus 1.6287), meaning it will interrupt circuit current at a lower thermal threshold. This part is suitable for applications requiring AC voltage protection (12V AC rating) in addition to DC protection.

Q: What is the significance of the melting I²t difference between 0441005.WR and 0438005.WRGT?

A: Melting I²t defines the thermal energy required to melt the fuse element. The 0441005.WR (1.6287) requires greater thermal energy to open compared to 0438005.WRGT (0.747). This means 0438005.WRGT will respond faster to overcurrent conditions. Selection depends on circuit protection requirements and tolerance for transient current spikes.

Q: Are all three parts suitable for high-temperature applications?

A: Yes. All three parts are rated for operating temperatures from -55°C to 150°C, providing equivalent thermal operating range.

Q: What are the inventory implications for these substitutes?

A: 0441005.WR has 17,784 pcs in stock, 0441005.WRA has 12,740 pcs in stock, and 0438005.WRGT has 150,400 pcs in stock. Availability should be verified at time of procurement.

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