Littelfuse 0473.375YRT1L Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0473.375YRT1L is a 375 mA, 125 V AC/DC board mount axial fuse in the PICO® II 473 series. This slow blow fuse is designed for through-hole PCB mounting applications requiring overcurrent protection in low-voltage circuits. The part is actively manufactured and widely stocked, with 1120 units available in Tape & Reel packaging. Equivalent substitute parts are identified based on identical electrical ratings, mechanical dimensions, and performance characteristics while differing only in packaging format.

Substiute Parts

0473.375YRT1L

Littelfuse Inc.In Stock: 12050473.375YRT1L Datasheet

Current PartRFQ

0473.375MAT1L

Littelfuse Inc.In Stock: 20700473.375MAT1L Datasheet

Parametric EquivalentRFQ

0473.375MRT1L

Littelfuse Inc.In Stock: 154950473.375MRT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0473.375YRT1L are qualified based on strict electrical and mechanical parameter equivalence. All substitute parts must maintain identical specifications across the following critical parameters:

• Current Rating: 375 mA
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Slow Blow
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Through Hole
• Package / Case: Axial
• Physical Dimensions: 0.135" Dia x 0.280" L (3.43mm x 7.11mm)
• Breaking Capacity: 50A @ Rated Voltage
• Melting I²t: 0.085
• DC Cold Resistance: 1.74 Ohms
• Operating Temperature Range: -55°C ~ 125°C
• Approval Agencies: CSA, UR
• RoHS Compliance: ROHS3 Compliant

The identified substitutes differ only in packaging format (Cut Tape vs. Tape & Reel), which does not affect electrical performance or mechanical compatibility in PCB assembly applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—0473.375YRT1L, 0473.375MAT1L, and 0473.375MRT1L—are functionally equivalent for PCB assembly applications requiring 375 mA overcurrent protection at 125 V AC/DC. Selection between these parts should be based on packaging and supply chain requirements:

• 0473.375YRT1L (Tape & Reel): Suitable for high-volume automated assembly processes requiring continuous reel feeding.
• 0473.375MAT1L (Cut Tape): Appropriate for moderate-volume production or mixed-component assembly where individual tape segments are preferred.
• 0473.375MRT1L (Cut Tape): Highest inventory availability (15,400 units) for immediate procurement needs.

All parts maintain identical electrical performance, mechanical compatibility, and regulatory compliance (CSA, UR approvals; ROHS3 compliance). Selection does not impact circuit performance or reliability.

Frequently Asked Questions (FAQ)

Q: Can 0473.375MAT1L or 0473.375MRT1L be used as direct replacements for 0473.375YRT1L?

A: Yes. All three parts are parametric equivalents with identical electrical ratings (375 mA, 125 V AC/DC), response time (Slow Blow), physical dimensions (0.135" Dia x 0.280" L), and performance characteristics. The only difference is packaging format (Tape & Reel vs. Cut Tape), which does not affect electrical function or PCB compatibility.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous reels for automated pick-and-place assembly. Cut Tape (CT) packaging provides components in segmented tape strips, suitable for manual assembly or lower-volume production. Both formats contain identical components with no electrical or mechanical differences.

Q: Are all three parts certified by the same regulatory agencies?

A: Yes. All three parts carry CSA and UR approvals and are ROHS3 compliant, meeting identical regulatory requirements for overcurrent protection devices.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t value of 0.085 defines the thermal energy required to melt the fuse element. This parameter is identical across all three parts and determines the fuse's response to overcurrent conditions. Identical I²t values ensure identical protection characteristics.

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

A: Yes. All three parts are rated for 125 V AC and 125 V DC operation, making them suitable for both alternating and direct current applications within the specified voltage range.

Q: What is the operating temperature range?

A: All three parts operate across -55°C to 125°C, providing performance stability across industrial and commercial temperature environments.