Littelfuse 0253.250M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0253.250M is a 250 mA, 125 V AC/DC board mount axial fuse from the PICO® II 253 series. This through-hole component is designed for circuit protection in applications requiring fast-blow response characteristics. The part maintains active product status with full compliance to RoHS3, REACH, and multiple approval agencies including CSA, QPL, and UR. Substitute parts are identified when identical electrical and mechanical parameters are maintained across the same product series and manufacturer.

Substiute Parts

0253.250M

Littelfuse Inc.In Stock: 7810253.250M Datasheet

Current PartRFQ

0253.250V

Littelfuse Inc.In Stock: 13240253.250V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0253.250M is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical specifications in the following categories:

Current Rating: 250 mA (exact match required) Voltage Rating: 125 V AC and 125 V DC (exact match required) Response Time: Fast Blow (exact match required) Mounting Type: Through Hole (exact match required) Package / Case: Axial (exact match required) Physical Dimensions: 0.103" Dia x 0.280" L (exact match required) Breaking Capacity: 50A AC, 300A DC (exact match required) DC Cold Resistance: 0.665 Ohms (exact match required) Melting I²t: 0.0116 (exact match required) Operating Temperature Range: -55°C ~ 125°C (exact match required) Series: PICO® II 253 (exact match required)

The substitute part 0253.250V meets all these criteria and is classified as a parametric equivalent within the same manufacturer product line.

Parameter Comparison

Engineering Selection Recommendations

Both the 0253.250M and 0253.250V are active products from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability and packaging considerations. The 0253.250V currently maintains higher inventory levels (1287 pcs vs. 719 pcs). Both parts carry equivalent compliance certifications (CSA, QPL, UR) and maintain RoHS3 compliance. No technical differentiation exists between these components for circuit protection applications requiring 250 mA fast-blow fuse protection at 125 V AC/DC ratings.

Frequently Asked Questions (FAQ)

Q: Can the 0253.250V be used as a direct replacement for the 0253.250M?

A: Yes. Both parts are parametric equivalents with identical current ratings (250 mA), voltage ratings (125 V AC/DC), response time (fast blow), physical dimensions (0.103" Dia x 0.280" L), and all electrical characteristics. They are interchangeable for circuit protection applications.

Q: Are there any differences in approval certifications between these parts?

A: No. Both parts carry identical approval agency certifications: CSA, QPL, and UR. Both maintain RoHS3 compliance and REACH unaffected status.

Q: What determines if a fuse can substitute for the 0253.250M?

A: A substitute fuse must match all critical parameters: 250 mA current rating, 125 V AC and DC voltage ratings, fast-blow response, through-hole mounting, axial package, 0.103" Dia x 0.280" L dimensions, 50A AC / 300A DC breaking capacity, 0.665 Ohms DC cold resistance, 0.0116 melting I²t, and -55°C to 125°C operating temperature range.

Q: Does packaging format affect substitution eligibility?

A: Both parts are supplied in bulk packaging. The physical package / case format (axial) is identical and is a critical substitution parameter. Any change in package format disqualifies a part as a direct substitute.

Q: Are operating temperature ranges identical?

A: Yes. Both parts operate across the identical temperature range of -55°C to 125°C, ensuring equivalent thermal performance in circuit protection applications.