Equivalent & Substitute Parts for Ohmite 41F20R

Part Overview

The Ohmite 41F20R is a 20 Ohm, 1% tolerance, 1W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is actively manufactured and maintained in stock. Substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements such as RoHS compliance or moisture resistance specifications.

Substiute Parts

41F20R

OhmiteIn Stock: 93141F20R Datasheet

Current PartRFQ

ALSR0120R00FE12

Vishay DaleIn Stock: 984ALSR0120R00FE12 Datasheet

DirectRFQ

RS01A20R00FS70

Vishay DaleIn Stock: 2007RS01A20R00FS70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 41F20R are qualified based on the following electrical and mechanical parameters:

• Resistance value: 20 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 1W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitutes—ALSR0120R00FE12 and RS01A20R00FS70—meet all core electrical and mechanical requirements. Differences in temperature coefficient, operating temperature range, physical dimensions, RoHS status, and moisture resistance features are secondary parameters that may influence selection based on specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

ALSR0120R00FE12 (Vishay Dale): This substitute is recommended for applications requiring RoHS3 compliance. It features moisture-resistant construction and an MSL rating of 1 (Unlimited), making it suitable for humid or moisture-prone environments. The slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and smaller physical dimensions should be evaluated against circuit layout constraints.

RS01A20R00FS70 (Vishay Dale): This substitute matches the temperature coefficient of the original part (±20ppm/°C) and provides moisture-resistant construction. It is available in Cut Tape packaging and offers the smallest physical footprint among the three options. RoHS compliance status differs from the original part; REACH status is listed as affected.

Both substitutes are actively manufactured and maintain equivalent electrical performance within the specified tolerance and power rating parameters.

Frequently Asked Questions (FAQ)

Q: Can ALSR0120R00FE12 and RS01A20R00FS70 be used interchangeably with the 41F20R?

A: Yes, both substitutes meet the core electrical specifications: 20 Ohms, ±1% tolerance, 1W power rating, wirewound composition, and axial package. Physical dimensions differ slightly; verify PCB layout compatibility before substitution.

Q: What is the significance of the temperature coefficient difference between these parts?

A: The 41F20R and RS01A20R00FS70 both specify ±20ppm/°C, while ALSR0120R00FE12 specifies ±30ppm/°C. In applications with strict temperature stability requirements, the lower coefficient (±20ppm/°C) may be preferred. For most general-purpose circuits, this difference is negligible.

Q: Which substitute should I select if RoHS compliance is required?

A: ALSR0120R00FE12 is ROHS3 compliant. The original 41F20R and RS01A20R00FS70 are both RoHS non-compliant.

Q: Are there packaging differences I should consider?

A: ALSR0120R00FE12 is supplied in Bulk packaging; RS01A20R00FS70 is supplied in Cut Tape (CT). The original part packaging is not specified. Verify packaging requirements for your procurement and assembly processes.

Q: What does "moisture resistant" mean for these resistors?

A: Both Vishay Dale substitutes feature moisture-resistant construction. ALSR0120R00FE12 carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity limitations. This specification is relevant for applications exposed to high humidity or condensation conditions.

Q: Can I use these parts in high-temperature applications?

A: Both substitutes specify an operating temperature range of -65°C to 250°C. The original 41F20R does not provide an operating temperature specification. Verify thermal requirements against the stated operating range before selection.