41F1K2 Equivalent & Substitute Parts

Part Overview

The 41F1K2 is a 1.2 kOhms ±1% 1W through-hole resistor with axial wirewound composition, manufactured by Ohmite under the Ohmicone® 40 series. This component is currently active in production and maintains 901 pieces in new original stock inventory. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or when design requirements permit alternative manufacturers meeting identical or compatible electrical and mechanical specifications.

Substiute Parts

41F1K2

OhmiteIn Stock: 96541F1K2 Datasheet

Current PartRFQ

41F1K2E

OhmiteIn Stock: 71041F1K2E Datasheet

DirectRFQ

ALSR011K200FE12

Vishay DaleIn Stock: 1045ALSR011K200FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 41F1K2 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Resistance value: 1.2 kOhms
• Tolerance: ±1%
• Power rating: 1W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Physical dimensions: Compatible with 0.126" diameter and 0.437" length specifications
• Number of terminations: 2-pin axial configuration

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring direct functional equivalence in circuit applications. Variations in temperature coefficient, operating temperature range, and compliance certifications are noted but do not affect primary substitution eligibility when these core parameters align.

Parameter Comparison

Engineering Selection Recommendations

The 41F1K2E from Ohmite represents the primary equivalent substitute, maintaining identical electrical specifications and physical dimensions while offering RoHS compliance and an extended operating temperature range of -55°C to 275°C. This part is suitable for applications requiring regulatory compliance and environmental performance consistency with the original design.

The ALSR011K200FE12 from Vishay Dale qualifies as a functional substitute with equivalent electrical performance. This part features moisture-resistant construction, ROHS3 compliance, and an operating temperature range of -65°C to 250°C. Physical dimensions differ slightly (0.110" diameter x 0.406" length versus 0.126" x 0.437"), which may require PCB layout verification for applications with space constraints. The temperature coefficient specification of ±30ppm/°C represents a minor deviation from the primary part's ±20ppm/°C rating.

Selection between substitute parts should be based on compliance requirements, thermal operating conditions, available board space, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the 41F1K2E be used as a direct replacement for the 41F1K2?

A: Yes. The 41F1K2E maintains identical resistance (1.2 kOhms), tolerance (±1%), power rating (1W), composition (wirewound), and physical dimensions (0.126" Dia x 0.437" L). Both parts are manufactured by Ohmite and feature the same axial package configuration. The primary difference is RoHS compliance status and operating temperature range specification.

Q: What are the physical dimension differences between the ALSR011K200FE12 and the original 41F1K2?

A: The ALSR011K200FE12 measures 0.110" diameter x 0.406" length (2.79mm x 10.31mm), compared to the 41F1K2 specification of 0.126" diameter x 0.437" length (3.20mm x 11.10mm). The substitute part is slightly smaller in both diameter and length. PCB layout verification is required to confirm compatibility with existing footprints and spacing requirements.

Q: Are all substitute parts suitable for the same temperature range applications?

A: Operating temperature ranges differ among the parts. The 41F1K2 does not specify an operating temperature range. The 41F1K2E operates from -55°C to 275°C, while the ALSR011K200FE12 operates from -65°C to 250°C. Application thermal requirements must be evaluated against these specifications.

Q: What is the significance of the temperature coefficient difference between the 41F1K2 and ALSR011K200FE12?

A: The 41F1K2 specifies ±20ppm/°C while the ALSR011K200FE12 specifies ±30ppm/°C. This represents a 50% increase in temperature-dependent resistance variation. For precision applications requiring tight tolerance maintenance across temperature ranges, this difference should be evaluated against circuit performance requirements.

Q: Do all substitute parts meet RoHS compliance requirements?

A: The original 41F1K2 is RoHS non-compliant. The 41F1K2E is RoHS Compliant, and the ALSR011K200FE12 is ROHS3 Compliant. Applications requiring RoHS compliance should specify either the 41F1K2E or ALSR011K200FE12.

Q: Which substitute part offers the best moisture resistance?

A: The ALSR011K200FE12 is specified as moisture-resistant wirewound construction with MSL rating of 1 (Unlimited). The 41F1K2E carries MSL rating of 1 (Unlimited) but does not specify moisture-resistant features. The original 41F1K2 lists MSL as Not Applicable.