45F900E Equivalent & Substitute Parts

Part Overview

The Ohmite 45F900E is a 900 Ohms ±1% 5W through hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with high power dissipation capability in a compact axial package. The part maintains Active product status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for procurement flexibility, inventory management, or supply chain continuity.

Substiute Parts

45F900E

OhmiteIn Stock: 82345F900E Datasheet

Current PartRFQ

UB5C-900RF1

RiedonIn Stock: 1473UB5C-900RF1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F900E is determined by strict alignment of core electrical and mechanical parameters. The following criteria establish valid equivalency:

Primary Substitution Criteria:

• Resistance value: 900 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through hole (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Moisture sensitivity: MSL 1 (exact match required)

The Riedon UB5C-900RF1 meets all primary substitution criteria. Both parts share identical electrical specifications and axial package configuration, enabling direct functional equivalency. Mechanical dimensions differ (UB5C-900RF1 is more compact), but both conform to standard axial package specifications and mount identically on PCBs.

Parameter Comparison

*The UB5C-900RF1 operating temperature range (-55°C ~ 250°C) is narrower than the 45F900E (-55°C ~ 275°C). Substitution is valid for applications operating within the -55°C ~ 250°C window.

Engineering Selection Recommendations

Both the 45F900E and UB5C-900RF1 are Active status components with full regulatory compliance. Selection between these parts should be based on the following factors:

45F900E (Ohmite): Select when the extended upper operating temperature limit of 275°C is required. This part provides the widest thermal operating window and is suitable for high-temperature applications.

UB5C-900RF1 (Riedon): Select when compact form factor is advantageous for PCB space constraints. The UB5C-900RF1 offers additional features including current sense capability, flame proof construction, moisture resistance, and pulse withstanding characteristics. This part is suitable for applications where these enhanced features provide functional benefit within the -55°C ~ 250°C operating range.

Both parts carry equivalent RoHS compliance certifications and unlimited moisture sensitivity ratings, ensuring suitability for standard industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the UB5C-900RF1 replace the 45F900E in all applications?

A: The UB5C-900RF1 is electrically and mechanically equivalent for applications operating within -55°C ~ 250°C. If your application requires operation above 250°C, the 45F900E is required due to its extended temperature rating to 275°C.

Q: Are the physical dimensions interchangeable?

A: Both parts use standard axial through-hole package configuration and mount identically on PCBs. The UB5C-900RF1 is more compact (6.40mm x 12.70mm versus 8.70mm x 23.80mm), which may be advantageous for space-constrained layouts but does not affect electrical performance or mounting compatibility.

Q: What does the ±1% tolerance mean for these resistors?

A: The ±1% tolerance indicates that the actual resistance value will be within 1% of the nominal 900 Ohm specification. For the 45F900E and UB5C-900RF1, this means the measured resistance will fall between 891 Ohms and 909 Ohms.

Q: Are both parts RoHS compliant?

A: Yes. The 45F900E is RoHS Compliant, and the UB5C-900RF1 is ROHS3 Compliant. Both meet current RoHS requirements for lead-free construction and restricted substance limitations.

Q: What is the significance of the ±20ppm/°C temperature coefficient?

A: The temperature coefficient indicates how much the resistance value changes with temperature. A ±20ppm/°C rating means the resistance will vary by approximately 0.002% per degree Celsius change. Both parts share this specification, ensuring stable performance across their respective operating temperature ranges.

Q: Can these 5W resistors be used in 3W or lower power applications?

A: Yes. A 5W rated resistor can be used in applications requiring lower power dissipation. The 5W rating represents the maximum safe power handling capability; actual power dissipation depends on circuit design and current flow.