SCF9550-45-06 Equivalent & Substitute Parts

Part Overview

The SCF9550-45-06 is a 45A 80 VDC triggerable fuse designed for board mount surface mount applications in battery protection circuits. Manufactured by Eaton - Electronics Division, this component operates within a temperature range of -20°C to 60°C and features fast blow response characteristics with a triggerable range of 19.8 ~ 27V. The part is currently active in production with 666 pieces available in stock.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and functional characteristics align with the original specification, enabling direct replacement in circuit designs where the main part becomes unavailable or when alternative sourcing is required.

Substiute Parts

SCF9550-45-06

Eaton - Electronics DivisionIn Stock: 738SCF9550-45-06 Datasheet

Current PartRFQ

ITV9550L3045MR

Littelfuse Inc.In Stock: 3451ITV9550L3045MR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCF9550-45-06 is determined by the following critical parameters:

Primary Electrical Criteria:

• Current Rating: 45A (exact match required)
• Voltage Rating - DC: 80 VDC or higher (minimum threshold)
• Response Time: Fast Blow (functional equivalence)
• Breaking Capacity: 120A or greater

Mechanical Criteria:

• Mounting Type: Surface Mount (required)
• Fuse Type: Board Mount (required)
• Package / Case: Nonstandard SMD (compatible footprint)

Environmental & Compliance Criteria:

• Operating Temperature Range: Must encompass or exceed -20°C ~ 60°C
• RoHS Status: ROHS3 Compliant (mandatory)
• Moisture Sensitivity Level: 1 (Unlimited) or equivalent

The ITV9550L3045MR from Littelfuse Inc. meets the current rating and mounting requirements. However, the voltage rating differential (62 VDC versus 80 VDC) and triggerable voltage range variation (22.3 ~ 31.5V versus 19.8 ~ 27V) represent design parameter differences that must be evaluated within the specific circuit application context.

Parameter Comparison

Engineering Selection Recommendations

SCF9550-45-06 (Eaton - Electronics Division):

• Primary selection for applications requiring 80 VDC rated protection
• Specified triggerable range of 19.8 ~ 27V for defined battery protection thresholds
• Lower DC cold resistance (0.0005 Ohms) provides minimal voltage drop in circuit operation
• Operating temperature floor of -20°C supports extended cold environment applications
• Active product status with 666 units in stock ensures supply continuity

ITV9550L3045MR (Littelfuse Inc.):

• Suitable for applications with maximum system voltage of 62 VDC
• Triggerable range of 22.3 ~ 31.5V accommodates higher voltage threshold requirements
• Holds cURus and TUV certifications, providing additional regulatory compliance documentation
• Operating temperature range of -10°C ~ 65°C extends upper temperature capability
• Higher inventory availability (3353 units) supports rapid procurement
• DC cold resistance of 0.002 Ohms represents increased voltage drop relative to primary part

Selection between these components depends on circuit voltage requirements, triggerable voltage thresholds, and regulatory certification needs specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can the ITV9550L3045MR directly replace the SCF9550-45-06 in all applications?

A: Direct replacement is limited by voltage rating differences. The ITV9550L3045MR is rated for 62 VDC maximum, while the SCF9550-45-06 is rated for 80 VDC. Applications operating above 62 VDC require the SCF9550-45-06. Additionally, triggerable voltage ranges differ (22.3 ~ 31.5V versus 19.8 ~ 27V), which affects battery protection threshold behavior.

Q: What is the significance of the DC cold resistance difference?

A: The SCF9550-45-06 exhibits 0.0005 Ohms cold resistance compared to 0.002 Ohms for the ITV9550L3045MR. This 4x difference results in increased voltage drop across the ITV9550L3045MR during normal circuit operation. In high-current battery protection circuits, this resistance differential may impact system performance and thermal characteristics.

Q: Are the physical dimensions compatible for PCB layout?

A: Both components use Nonstandard SMD packaging with similar footprints. The SCF9550-45-06 measures 9.50mm x 5.00mm x 2.30mm, while the ITV9550L3045MR measures 9.30mm x 5.00mm x 2.00mm. The height difference of 0.30mm and length difference of 0.20mm may require PCB layout verification, particularly in space-constrained designs.

Q: What certifications does each part carry?

A: The SCF9550-45-06 does not specify approval agencies in the provided documentation. The ITV9550L3045MR carries cURus and TUV certifications, providing additional regulatory compliance documentation for applications requiring third-party validation.

Q: How do the operating temperature ranges compare?

A: The SCF9550-45-06 operates from -20°C to 60°C, while the ITV9550L3045MR operates from -10°C to 65°C. The SCF9550-45-06 provides superior low-temperature performance, while the ITV9550L3045MR extends upper temperature capability by 5°C.

Q: What is the current rating equivalence?

A: Both components are rated for 45A continuous current with 120A breaking capacity at rated voltage. Current handling capability is identical between the two parts.