Littelfuse 0438002.WR Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0438002.WR is a 2A, 12VAC/32VDC surface mount board fuse in 0603 (1608 Metric) package with fast-blow response characteristics. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application category.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating - AC	12 V
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
RoHS Status	ROHS3 Compliant
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Current Rating: 2 A (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)
Response Time: Fast Blow (exact match required)
Voltage Rating - DC: 32 V (minimum requirement)
Voltage Rating - AC: 12 V or higher (minimum requirement)

All substitute parts listed meet or exceed these core parameters. Variations in secondary parameters such as melting I²t, DC cold resistance, and operating temperature range are acceptable provided the primary electrical and mechanical specifications align with application requirements.

Parameter Comparison

Parameter	0438002.WR (Main)	0438002.WRGT	CC06H2A-TR	SF-0603F200-2	TR/0603FA2-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Bourns Inc.	Eaton - Electronics Division
Current Rating (Amps)	2 A	2 A	2 A	2 A	2 A
Voltage Rating - AC	12 V	12 V	Not specified	Not specified	32 V
Voltage Rating - DC	32 V	32 V	32 V	32 V	32 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Breaking Capacity @ Rated Voltage	50A	50A AC, 50A DC	50A	50A	35A
Melting I²t	0.149	0.181	0.2	0.044	0.0491
DC Cold Resistance (Ohms)	0.051	0.049	0.061	0.033	0.051
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 85°C	-20°C ~ 105°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CSA, cURus	cULus	UL	CSA, UL
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

0438002.WRGT (Littelfuse Inc.) - Parametric equivalent with identical electrical specifications and active product status. Maintains original manufacturer continuity with Littelfuse series 438GT. Supports both CSA and cURus certifications. Recommended as primary replacement for obsolete 0438002.WR.

TR/0603FA2-R (Eaton - Electronics Division) - Active substitute with extended AC voltage rating (32V AC vs. 12V AC). Maintains 2A current rating, 32V DC rating, and fast-blow response. Supports CSA and UL certifications. Breaking capacity reduced to 35A. Suitable for applications requiring higher AC voltage margin.

CC06H2A-TR (Eaton - Electronics Division) - Active substitute with identical DC specifications. Supports cULus certification. Operating temperature range limited to -40°C ~ 85°C compared to original -55°C ~ 150°C. Evaluate thermal requirements before selection.

SF-0603F200-2 (Bourns Inc.) - Active substitute with lowest DC cold resistance (0.033 Ohms). Supports UL certification. Operating temperature range -20°C ~ 105°C. Evaluate thermal requirements for low-temperature applications below -20°C.

Frequently Asked Questions (FAQ)

Q: Can 0438002.WRGT be used as a direct replacement for the obsolete 0438002.WR?

A: Yes. The 0438002.WRGT maintains identical electrical specifications (2A, 12VAC, 32VDC), package (0603), response time (fast-blow), and operating temperature range (-55°C ~ 150°C). The primary difference is packaging format (Tape & Reel vs. unspecified) and active product status.

Q: What is the key difference between TR/0603FA2-R and the original 0438002.WR?

A: The TR/0603FA2-R provides higher AC voltage rating (32V AC vs. 12V AC) and maintains the 32V DC rating. Breaking capacity is reduced from 50A to 35A. DC cold resistance and melting I²t values differ. Verify application requirements for AC voltage and breaking capacity before substitution.

Q: Are there temperature limitations with the Eaton CC06H2A-TR substitute?

A: Yes. The CC06H2A-TR operating temperature range is -40°C ~ 85°C, compared to the original -55°C ~ 150°C. Applications requiring operation below -40°C or above 85°C require alternative selection.

Q: Which substitute has the lowest DC cold resistance?

A: The Bourns SF-0603F200-2 has the lowest DC cold resistance at 0.033 Ohms, compared to 0.051 Ohms for the original part. This may be relevant for low-power applications sensitive to resistive losses.

Q: Do all substitutes maintain the same package footprint?

A: All substitutes use the 0603 (1608 Metric) package. Physical dimensions vary slightly (length 0.061" to 0.063", width 0.032" to 0.033", height 0.018" to 0.020"). Verify PCB layout tolerances for critical applications.

Q: What certifications are maintained across all substitutes?

A: All substitutes maintain UL or equivalent certification (cULus, CSA). The original part carries CSA and UL. Verify specific certification requirements for your application before final selection.

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