Littelfuse 0325.175H Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325.175H is a 175 mA, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB and 3AG package formats. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement. The fuse is rated for 100 A breaking capacity at rated voltage with a melting I²t value of 0.22.

Key Parameters

Parameter	Value
Current Rating	175 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	0.22
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)

Substitute Part Grouping Explanation

Substitute parts for the 0325.175H are qualified based on electrical and mechanical parameter equivalence within the Littelfuse 325 series. All substitute candidates maintain identical specifications across the following critical parameters:

Current Rating: 175 mA
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Ceramic
Response Time: Slow Blow
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage: 100 A
Melting I²t: 0.22
Physical Dimensions: 0.275" Dia x 1.288" L (6.99mm x 32.72mm)

The three qualified substitutes (0325.175HXP, 0325.175MXP, 0325.175VXP) differ from the main part primarily in product status (active vs. obsolete) and compliance certifications, with no variation in electrical or mechanical performance characteristics.

Parameter Comparison

Parameter	0325.175H	0325.175HXP	0325.175MXP	0325.175VXP
Current Rating (Amps)	175 mA	175 mA	175 mA	175 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A	100 A
Melting I²t	0.22	0.22	0.22	0.22
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	8.84 Ohms	8.92 Ohms	8.92 Ohms	8.92 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	-	CE	CE	CE
Operating Temperature	-	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C

Engineering Selection Recommendations

All three substitute parts (0325.175HXP, 0325.175MXP, 0325.175VXP) are electrically and mechanically equivalent to the 0325.175H and are suitable for direct replacement in circuit designs. The primary distinction is product status: the 0325.175H is obsolete, while all substitutes maintain active product status with current manufacturing support.

The substitute parts carry CE approval and ROHS3 compliance certifications, whereas the original part lacks these designations. The operating temperature range of -55°C to 125°C is specified for all substitute parts. DC cold resistance values for the substitutes (8.92 Ohms) are marginally higher than the original part (8.84 Ohms), remaining within acceptable tolerance for ceramic cartridge fuse applications.

Selection among the three active substitutes may be based on packaging preference (all listed as Bulk) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 0325.175HXP, 0325.175MXP, or 0325.175VXP be used as direct replacements for the 0325.175H?

A: Yes. All three substitute parts maintain identical electrical ratings (175 mA, 250 V AC), fuse type (ceramic cartridge), response time (slow blow), and physical dimensions (0.275" Dia x 1.288" L). They are mechanically and electrically interchangeable in through-hole 3AB and 3AG package applications.

Q: What is the difference between the three substitute parts?

A: The 0325.175HXP, 0325.175MXP, and 0325.175VXP are parametrically equivalent. All three are active products with CE approval and ROHS3 compliance. Differences are limited to internal manufacturing variants within the Littelfuse 325 series. Selection may be based on inventory availability or packaging preferences.

Q: Why is the 0325.175H classified as obsolete?

A: The 0325.175H is no longer in active production. The three substitute parts represent the current active alternatives within the Littelfuse 325 series that maintain full electrical and mechanical equivalence.

Q: Are there compliance differences between the original part and substitutes?

A: Yes. The 0325.175H is RoHS non-compliant with no specified approval agency. All three substitutes are ROHS3 compliant with CE approval and specified operating temperature ranges (-55°C to 125°C). For applications requiring regulatory compliance, the substitute parts are preferred.

Q: Is the slight difference in DC cold resistance (8.84 Ohms vs. 8.92 Ohms) significant?

A: No. The 0.08 Ohm difference between the original part and substitutes is within normal manufacturing tolerance for ceramic cartridge fuses and does not affect circuit performance or fuse operation characteristics.

Q: Can these fuses be used in both AC and DC applications?

A: Yes. All parts are rated for 250 V AC/DC operation. The 175 mA current rating and slow-blow response apply to both AC and DC circuit protection applications.

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