Littelfuse 0275020.M Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0275020.M is a 20A, 32V AC/DC board mount axial fuse from the PICO® 275 series, designed for through-hole PCB applications. This part is classified as obsolete, making identification of active equivalent components essential for ongoing production, maintenance, and new design implementations. The primary substitute maintains identical electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

0275020.M

Littelfuse Inc.In Stock: 7880275020.M Datasheet

Current PartRFQ

0275020.MXL

Littelfuse Inc.In Stock: 1005000275020.MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0275020.M has one manufacturer-recommended substitute: 0275020.MXL. This substitution is valid based on the following criteria:

Electrical Parameters (Identical):

• Current Rating: 20 A
• Voltage Rating (AC/DC): 32 V
• Response Time: Fast Blow
• Breaking Capacity: 100 A AC, 300 A DC
• Melting I²t: 115
• DC Cold Resistance: 0.0031 Ohms

Mechanical Parameters (Identical):

• Mounting Type: Through Hole
• Package / Case: Axial
• Size / Dimension: 0.133" Dia x 0.310" L (3.38mm x 7.87mm)

Environmental Parameters (Identical):

• Operating Temperature Range: -55°C to 125°C
• Approval Agency: UL

The 0275020.MXL differs only in packaging format (Bulk vs. standard) and product status (Active vs. Obsolete), with improved RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: 0275020.MXL

The 0275020.MXL is the recommended substitute for the obsolete 0275020.M. Selection rationale:

• Electrical Equivalence: All electrical parameters are identical, ensuring direct functional replacement in circuit applications.
• Mechanical Compatibility: Identical package dimensions and through-hole mounting configuration allow direct PCB footprint compatibility without layout modifications.
• Product Status: Active product status ensures long-term availability and supply chain continuity.
• Compliance Improvement: ROHS3 compliance status meets current regulatory requirements for new designs and manufacturing operations.
• Certification Parity: Both parts maintain UL approval and identical environmental operating ranges.

For applications requiring the 0275020.M, the 0275020.MXL provides a direct, pin-compatible replacement with no circuit redesign necessary.

Frequently Asked Questions (FAQ)

Q: Can the 0275020.MXL be used as a direct replacement for the 0275020.M?

A: Yes. The 0275020.MXL is electrically and mechanically identical to the 0275020.M. All critical parameters—current rating, voltage rating, response time, breaking capacity, physical dimensions, and operating temperature range—are identical. The parts are directly interchangeable on existing PCBs.

Q: What is the difference between the 0275020.M and 0275020.MXL?

A: The primary differences are product status and packaging. The 0275020.M is obsolete, while the 0275020.MXL is active. The 0275020.MXL also carries ROHS3 compliance, whereas the 0275020.M is RoHS non-compliant. Both parts are supplied in axial package format and maintain identical electrical and mechanical specifications.

Q: Are there any circuit design changes required when switching from 0275020.M to 0275020.MXL?

A: No circuit design changes are required. The 0275020.MXL maintains identical electrical characteristics, including current rating, voltage rating, response time, and breaking capacity. PCB layout and footprint remain unchanged.

Q: What does "Fast Blow" response time mean for this fuse?

A: Fast Blow indicates the fuse operates with rapid response to overcurrent conditions. The melting I²t value of 115 defines the thermal energy threshold at which the fuse element melts and interrupts the circuit.

Q: Is the 0275020.MXL suitable for new product designs?

A: Yes. The 0275020.MXL is an active product with current manufacturing support, UL certification, and ROHS3 compliance, making it appropriate for new designs requiring a 20A, 32V AC/DC board mount axial fuse.

Q: What is the significance of the 0.0031 Ohms DC cold resistance specification?

A: DC cold resistance represents the fuse element resistance at room temperature before current flow. This low resistance value (0.0031 Ohms) minimizes voltage drop across the fuse during normal operation, reducing power dissipation and heat generation in the circuit.