Ohmite 41F120 120 Ohm 1W Axial Wirewound Resistor Equivalent & Substitute Parts

Part Overview

The Ohmite 41F120 is a 120 Ohm ±1% 1W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 1027 units in stock. Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating, and temperature coefficient) and mechanical compatibility (axial package, through-hole termination, and physical dimensions).

Substiute Parts

41F120

OhmiteIn Stock: 105541F120 Datasheet

Current PartRFQ

41F120E

OhmiteIn Stock: 111641F120E Datasheet

DirectRFQ

ALSR01120R0FE12

Vishay DaleIn Stock: 992ALSR01120R0FE12 Datasheet

DirectRFQ

RS01A120R0FS70

Vishay DaleIn Stock: 1784RS01A120R0FS70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 41F120 are qualified based on the following criteria:

Electrical Compatibility: All substitute parts maintain the same resistance value (120 Ohms), tolerance (±1%), and power rating (1W). Temperature coefficient values within ±30ppm/°C are acceptable for general-purpose applications where the main part's ±20ppm/°C specification is not a critical design constraint.

Mechanical Compatibility: All substitute parts use axial through-hole packaging with two terminations. Physical dimensions vary slightly but remain within acceptable tolerance ranges for standard PCB footprints designed for axial resistors.

Composition: All parts are wirewound construction, maintaining the same thermal and electrical characteristics as the main part.

Regulatory Compliance: Substitute parts are grouped by RoHS and REACH compliance status to support different application requirements.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 41F120E: Direct equivalent from the same manufacturer with identical electrical and mechanical specifications. Offers ROHS3 compliance, making it suitable for applications requiring RoHS certification. Recommended as the primary substitute when RoHS compliance is required and the original part is unavailable.

Vishay Dale ALSR01120R0FE12: Functionally equivalent with slightly tighter temperature coefficient specification (±30ppm/°C vs. ±20ppm/°C). Includes moisture-resistant features and ROHS3 compliance. Smaller physical dimensions (0.110" Dia) may require PCB layout verification for existing designs. Suitable for applications requiring enhanced environmental protection and RoHS certification.

Vishay Dale RS01A120R0FS70: Functionally equivalent with matching temperature coefficient (±20ppm/°C). Maintains RoHS non-compliant status consistent with the original part. Smallest physical dimensions (0.094" Dia) require PCB footprint verification. Highest inventory availability (1728 units). Suitable for applications where RoHS compliance is not required and space constraints are minimal.

Frequently Asked Questions (FAQ)

Q: Can I use Ohmite 41F120E as a direct replacement for Ohmite 41F120?

A: Yes. Both parts are from the same manufacturer with identical electrical specifications (120 Ohms ±1%, 1W, ±20ppm/°C) and mechanical dimensions (0.126" Dia x 0.437" L). The primary difference is RoHS compliance status. Use 41F120E when RoHS certification is required.

Q: What is the difference between the Vishay Dale ALSR01120R0FE12 and RS01A120R0FS70?

A: Both are 120 Ohm ±1% 1W axial wirewound resistors from Vishay Dale. The ALSR01120R0FE12 has a ±30ppm/°C temperature coefficient and is ROHS3 compliant. The RS01A120R0FS70 has a ±20ppm/°C temperature coefficient (matching the original part) but is RoHS non-compliant. Physical dimensions differ slightly: ALSR is 0.110" Dia, RS is 0.094" Dia.

Q: Will the smaller physical dimensions of the Vishay Dale parts affect my PCB design?

A: Possibly. The Vishay Dale ALSR01120R0FE12 (0.110" Dia) and RS01A120R0FS70 (0.094" Dia) are smaller than the Ohmite 41F120 (0.126" Dia). Verify that your PCB footprint and component placement can accommodate these dimensional variations. Smaller components may require layout adjustments but will fit standard axial resistor footprints.

Q: Which substitute part should I choose for a new design?

A: Selection depends on regulatory and environmental requirements. For RoHS-compliant applications, use Ohmite 41F120E or Vishay Dale ALSR01120R0FE12. For non-RoHS applications with maximum inventory availability, use Vishay Dale RS01A120R0FS70. All three maintain electrical equivalence with the original part.

Q: Are there any compatibility concerns with moisture resistance features?

A: The Vishay Dale ALSR01120R0FE12 includes moisture-resistant construction with MSL rating of 1 (Unlimited). This feature provides enhanced environmental protection and does not create compatibility issues with standard PCB assembly processes. The other parts have MSL ratings of Not Applicable, indicating standard moisture sensitivity handling.