SCF9550-45-10 Equivalent & Substitute Parts

Part Overview

The SCF9550-45-10 is a 45A, 80 VDC triggerable fuse designed for board mount surface mount applications, specifically for battery protection circuits. Manufactured by Eaton - Electronics Division, this component is classified as Active product status with full cURus approval. The fuse features fast blow response characteristics and operates across a temperature range of -20°C to 60°C with a triggerable voltage window of 33 to 47V.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across different manufacturer offerings. The SCF9550-45-10 has one qualified substitute part that meets the core functional requirements for battery protection applications.

Substiute Parts

SCF9550-45-10

Eaton - Electronics DivisionIn Stock: 3365SCF9550-45-10 Datasheet

Current PartRFQ

ITV9550L4045MR

Littelfuse Inc.In Stock: 973ITV9550L4045MR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCF9550-45-10 is determined by strict alignment of the following parameters:

Critical Electrical Parameters:

• Current Rating: 45A (exact match required)
• Response Time: Fast Blow (exact match required)
• Triggerable Voltage Range: 33 ~ 47V window (must overlap or contain the original range)
• Breaking Capacity: 120A (exact match required)

Critical Mechanical Parameters:

• Mounting Type: Surface Mount (exact match required)
• Package / Case: Nonstandard SMD (exact match required)
• Application: Battery Protection (exact match required)

Compliance Parameters:

• Approval Agency: cURus certification (required)
• RoHS Status: ROHS3 Compliant (required)

The substitute part ITV9550L4045MR from Littelfuse Inc. qualifies as an equivalent because it maintains the 45A current rating, fast blow response, surface mount configuration, and battery protection application. The voltage rating differential (62 VDC vs. 80 VDC) and triggerable range variation (33 ~ 46.9V vs. 33 ~ 47V) represent acceptable operational parameters within the defined substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: SCF9550-45-10 (Eaton)

The SCF9550-45-10 remains the specified component when the full 80 VDC rating and extended low-temperature operation (-20°C) are required. This part carries cURus approval and maintains ROHS3 compliance. The lower DC cold resistance (0.0005 Ohms) provides minimal voltage drop in battery protection circuits.

Substitute Part: ITV9550L4045MR (Littelfuse)

The ITV9550L4045MR qualifies as an equivalent substitute when the application operates within 62 VDC maximum and the operating temperature range of -10°C to 65°C is acceptable. This part carries both cURus and TUV approvals, providing additional regulatory coverage. The triggerable voltage range (33 ~ 46.9V) overlaps substantially with the original specification.

Selection Criteria:

Use the SCF9550-45-10 when:

• System voltage exceeds 62 VDC
• Operating temperature drops below -10°C
• Lowest possible DC cold resistance is required

Use the ITV9550L4045MR when:

• System voltage remains at or below 62 VDC
• Operating temperature range of -10°C to 65°C is acceptable
• Dual approval (cURus and TUV) is advantageous
• Alternative sourcing from Littelfuse is preferred

Both parts maintain identical current rating (45A), response time (fast blow), breaking capacity (120A), and surface mount configuration. Both are Active status products with ROHS3 compliance and unlimited moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can the ITV9550L4045MR be used in place of the SCF9550-45-10 in all applications?

A: The ITV9550L4045MR is suitable for applications where the system voltage does not exceed 62 VDC and the minimum operating temperature does not fall below -10°C. The SCF9550-45-10 is required for higher voltage systems or extended low-temperature operation.

Q: What is the significance of the different DC cold resistance values (0.0005 Ohms vs. 0.002 Ohms)?

A: The SCF9550-45-10 exhibits lower DC cold resistance, resulting in reduced voltage drop across the fuse during normal circuit operation. In battery protection applications with tight voltage margins, this difference may be relevant to circuit performance calculations.

Q: Are both parts compatible with the same PCB footprint?

A: Both parts use Nonstandard SMD packaging with surface mount configuration. However, dimensional differences exist: the SCF9550-45-10 measures 9.50mm x 5.00mm x 2.30mm, while the ITV9550L4045MR measures 9.30mm x 5.00mm x 2.00mm. PCB layout verification is necessary to confirm footprint compatibility.

Q: What is the difference between the triggerable voltage ranges?

A: The SCF9550-45-10 triggers between 33 ~ 47V, while the ITV9550L4045MR triggers between 33 ~ 46.9V. Both ranges overlap substantially and are functionally equivalent for battery protection circuits operating within these windows.

Q: Do both parts carry the same regulatory approvals?

A: Both parts carry cURus approval. The ITV9550L4045MR additionally carries TUV approval, providing broader regulatory coverage. Both are ROHS3 compliant.

Q: What is the maximum fault current each part can handle?

A: Both the SCF9550-45-10 and ITV9550L4045MR have a breaking capacity of 120A at their respective rated voltages, providing equivalent fault current protection capability.

Q: Can these parts be used interchangeably in existing inventory?

A: Interchangeability depends on the specific application voltage and temperature requirements. Verify that the system voltage does not exceed 62 VDC and that the operating temperature range of -10°C to 65°C is acceptable before substituting the ITV9550L4045MR for the SCF9550-45-10.