Ohmite 45F900 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F900 is a 900 Ohms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 991 pieces in stock. Substitute parts are necessary to address supply chain flexibility, packaging preferences, compliance requirements, or specific environmental operating conditions while maintaining electrical and mechanical compatibility.

Substiute Parts

45F900

OhmiteIn Stock: 100245F900 Datasheet

Current PartRFQ

45F900E

OhmiteIn Stock: 105345F900E Datasheet

DirectRFQ

ALSR05900R0FE12

Vishay DaleIn Stock: 1830ALSR05900R0FE12 Datasheet

DirectRFQ

RS005900R0FS73

Vishay DaleIn Stock: 1283RS005900R0FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 45F900 is determined by the following core parameters:

• Electrical Match: Resistance value (900 Ohms), tolerance (±1%), and power rating (5W) must be identical
• Construction: Wirewound composition required
• Package: Axial through-hole configuration mandatory
• Termination Count: Two-terminal configuration required

All listed substitute parts meet these core electrical and mechanical criteria. Variations in temperature coefficient, operating temperature range, physical dimensions, RoHS compliance status, and packaging format (bulk vs. cut tape) represent secondary differences that do not affect functional substitutability within the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

45F900E (Ohmite, Bulk Packaging) This part is electrically and mechanically identical to the main part number 45F900, with identical dimensions and temperature coefficient. The primary distinction is ROHS3 compliance and bulk packaging format. Selection is appropriate when RoHS3 compliance is required and bulk packaging is acceptable for assembly operations.

ALSR05900R0FE12 (Vishay Dale, Bulk Packaging) This substitute meets all core electrical parameters and offers ROHS3 compliance with moisture-resistant construction. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L vs. 0.343" Dia x 0.937" L), and temperature coefficient is ±30ppm/°C versus ±20ppm/°C. Operating temperature range is specified (-65°C ~ 250°C). Selection is appropriate for applications requiring moisture resistance, RoHS3 compliance, and extended temperature operation within the specified range.

RS005900R0FS73 (Vishay Dale, Cut Tape Packaging) This substitute meets all core electrical parameters with identical temperature coefficient (±20ppm/°C) and specified operating temperature range (-65°C ~ 250°C). Physical dimensions are slightly smaller. RoHS compliance status is non-compliant. Packaging is cut tape format. Selection is appropriate for applications requiring extended temperature operation and cut tape packaging, where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 45F900E be used as a direct replacement for the 45F900? A: Yes. Both parts are manufactured by Ohmite with identical electrical specifications (900 Ohms ±1%, 5W), wirewound construction, axial package, and identical physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS3 compliance status and packaging format (bulk vs. standard).

Q: What is the significance of the physical dimension differences between Ohmite and Vishay Dale parts? A: The Vishay Dale substitutes (ALSR05900R0FE12 and RS005900R0FS73) have slightly smaller dimensions (0.312" Dia x 0.875" L vs. 0.343" Dia x 0.937" L). These dimensional variations are within typical axial wirewound resistor tolerances and do not affect electrical performance or standard PCB footprint compatibility for through-hole applications.

Q: Which substitute should be selected for RoHS3 compliance? A: Both 45F900E (Ohmite) and ALSR05900R0FE12 (Vishay Dale) are ROHS3 compliant. The 45F900E maintains identical specifications to the original part, while ALSR05900R0FE12 adds moisture-resistant features and extended operating temperature range.

Q: What is the difference between bulk and cut tape packaging? A: Bulk packaging (45F900E, ALSR05900R0FE12) is suitable for manual assembly or reel-fed automated equipment. Cut tape packaging (RS005900R0FS73) provides individual component strips for selective component placement and is commonly used in mixed-technology assembly processes.

Q: Are there operating temperature considerations for substitution? A: The original 45F900 does not specify an operating temperature range. Vishay Dale substitutes specify -65°C ~ 250°C operation. If the application requires operation outside this range or at unspecified temperatures, the original Ohmite part or 45F900E should be selected pending application-specific thermal analysis.

Q: Can the ALSR05900R0FE12 be used in moisture-sensitive environments? A: Yes. The ALSR05900R0FE12 includes moisture-resistant construction and carries MSL rating of 1 (Unlimited), indicating no moisture sensitivity limitations during storage or handling.