Ohmite 41F900 Equivalent & Substitute Parts

Part Overview

The Ohmite 41F900 is a 900 Ohms ±1% 1W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 980 pieces in stock. The part is RoHS non-compliant, which may necessitate identification of compliant alternatives for applications requiring regulatory adherence or long-term supply chain stability.

Substiute Parts

41F900

OhmiteIn Stock: 106241F900 Datasheet

Current PartRFQ

41F900E

OhmiteIn Stock: 111841F900E Datasheet

DirectRFQ

ALSR01900R0FE12

Vishay DaleIn Stock: 1243ALSR01900R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 41F900 is determined by the following critical parameters:

• Resistance value: 900 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 1W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitute parts meet all mandatory electrical and mechanical parameters. Variations in temperature coefficient, physical dimensions, and RoHS compliance status are secondary considerations that do not affect functional interchangeability within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

41F900E (Ohmite): This part is functionally identical to the main part number with matching electrical specifications and physical dimensions. The primary distinction is ROHS3 compliance, making this the direct upgrade path for applications requiring regulatory adherence. Both parts belong to the same Ohmicone® 40 series and share identical temperature coefficient performance.

ALSR01900R0FE12 (Vishay Dale): This cross-manufacturer substitute meets all core electrical requirements and achieves ROHS3 compliance. The ALSR series offers moisture-resistant construction and an extended operating temperature range (-65°C ~ 250°C). Physical dimensions are slightly smaller (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L), which may affect PCB layout compatibility. Temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the main part. This option is suitable for applications where cross-manufacturer sourcing and enhanced environmental protection are acceptable.

Frequently Asked Questions (FAQ)

Q: Can 41F900E be used as a direct replacement for 41F900?

A: Yes. The 41F900E is electrically and mechanically identical to the 41F900, with identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The primary difference is RoHS3 compliance status.

Q: What are the physical dimension differences between the substitute parts?

A: The 41F900 and 41F900E share identical dimensions: 0.126" Dia x 0.437" L (3.20mm x 11.10mm). The ALSR01900R0FE12 is slightly smaller at 0.110" Dia x 0.406" L (2.79mm x 10.31mm). Verify PCB footprint compatibility before substitution.

Q: Does the temperature coefficient difference affect interchangeability?

A: The ALSR01900R0FE12 has a ±30ppm/°C temperature coefficient compared to ±20ppm/°C for the main part. Both values are within acceptable ranges for general-purpose applications. Applications requiring tighter temperature stability should retain the original specification.

Q: Are all substitute parts RoHS compliant?

A: The 41F900E and ALSR01900R0FE12 are both ROHS3 compliant. The original 41F900 is RoHS non-compliant.

Q: Can ALSR01900R0FE12 be used in space-constrained PCB layouts?

A: The ALSR01900R0FE12 has smaller physical dimensions, which may allow use in tighter layouts. However, verify that the smaller diameter and length do not conflict with existing PCB hole spacing or component clearance requirements.