Equivalent & Substitute Parts for 0464004.DR

Part Overview

The 0464004.DR is a 4A 250VAC surface mount board mount fuse manufactured by Littelfuse Inc. under the NANO²® 464 series. This component is designed for circuit protection in applications requiring fast-blow response characteristics with a 2-SMD, square end block package configuration. The part maintains active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across alternative manufacturers while preserving circuit protection integrity.

Substiute Parts

0464004.DR

Littelfuse Inc.In Stock: 36110464004.DR Datasheet

Current PartRFQ

TR-1245UMFF4-R

Eaton - Electronics DivisionIn Stock: 3716TR-1245UMFF4-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0464004.DR is determined by the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 4 A (exact match required)
• Fuse Type: Board Mount, Surface Mount configuration
• Package / Case: 2-SMD, Square End Block (mechanical compatibility)
• Response Time: Fast Blow characteristic
• Breaking Capacity: 100A minimum at rated voltage
• Mounting Type: Surface Mount

Allowable Parameter Variations:

• Voltage Rating - AC: Equal to or greater than 250V (uprating permitted)
• Voltage Rating - DC: May be specified if not present in original
• Operating Temperature Range: May extend beyond -55°C ~ 125°C
• DC Cold Resistance: Minor variations acceptable within industry tolerance
• Approval Agencies: Different certifications acceptable if meeting equivalent safety standards

The substitute part TR-1245UMFF4-R from Eaton - Electronics Division meets all primary criteria with identical current rating, fuse type, package configuration, and response time. The substitute provides higher AC voltage rating (350V vs 250V) and includes DC voltage specification (250V), representing an uprated alternative suitable for applications requiring enhanced voltage margin.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (0464004.DR): Select the original 0464004.DR when the application requires PSE or UMF certification specifically, operates at temperatures below -40°C, or when the exact resistance specification of 0.0156 Ohms is critical to circuit performance. This part maintains active manufacturing status with established supply chain availability.

Substitute Part Selection (TR-1245UMFF4-R): The TR-1245UMFF4-R from Eaton serves as a direct functional substitute for applications operating within the -40°C ~ 125°C temperature range. This substitute is appropriate when UL certification satisfies regulatory requirements, when higher AC voltage rating (350V) provides beneficial design margin, or when DC voltage specification (250V) is required by the application. The substitute maintains identical current rating, package configuration, and response characteristics essential for circuit protection function.

Interchangeability Conditions: Both parts are mechanically and electrically interchangeable within their specified operating parameters. The dimensional difference of 0.004" in length (12.10mm vs 12.00mm) falls within standard PCB footprint tolerance. The resistance differential of 0.0034 Ohms represents approximately 22% variation and is acceptable for fuse applications where resistance tolerance is typically ±20%.

Frequently Asked Questions (FAQ)

Q: Can TR-1245UMFF4-R replace 0464004.DR in all applications?

A: TR-1245UMFF4-R is functionally equivalent for applications operating within -40°C to 125°C. If your application requires operation below -40°C, the original 0464004.DR is required. Verify that UL certification meets your regulatory requirements if PSE or UMF certification was previously specified.

Q: What is the significance of the higher AC voltage rating on the substitute?

A: The TR-1245UMFF4-R is rated for 350V AC compared to 250V AC on the original part. This higher rating does not affect operation in 250V applications; it indicates the substitute can safely operate at higher voltages. This uprating provides additional design margin and does not change the fuse's response characteristics at 4A.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: Yes. The substitute measures 12.00mm length versus 12.10mm on the original, a difference of 0.10mm. Both parts use identical 2-SMD, square end block packaging with 0.177" width and height. This dimensional tolerance is within standard PCB footprint specifications and requires no layout modification.

Q: How do the resistance values affect circuit performance?

A: The original part specifies 0.0156 Ohms DC cold resistance while the substitute measures 0.019 Ohms. This 0.0034 Ohm difference represents approximately 22% variation, which is within industry tolerance for fuse components. For most applications, this resistance differential has negligible impact on circuit operation. If precise resistance specification is critical to your design, confirm with circuit analysis before substitution.

Q: What certifications apply to each part?

A: The 0464004.DR carries PSE and UMF approvals. The TR-1245UMFF4-R carries UL certification. Both certifications meet international safety standards for circuit protection devices. Verify that your application's regulatory requirements accept UL certification if the original part specified PSE or UMF.

Q: Can these parts be used interchangeably in new designs?

A: Yes. Both parts meet identical electrical specifications for 4A fast-blow fuse operation in surface mount board mount applications. New designs may select either part based on certification requirements, temperature operating range, and supply chain availability. Ensure component selection documentation specifies the chosen part number for manufacturing traceability.