Ohmite 43F1K2 Equivalent & Substitute Parts

Part Overview

The Ohmite 43F1K2 is a 1.2 kOhms ±1% 3W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 1012 units in new original stock. Equivalent and substitute parts are identified when identical electrical specifications and mechanical compatibility are required for circuit applications where the primary part is unavailable or when alternative sourcing is necessary.

Substiute Parts

43F1K2

OhmiteIn Stock: 104443F1K2 Datasheet

Current PartRFQ

ALSR031K200FE12

Vishay DaleIn Stock: 824ALSR031K200FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 43F1K2 are qualified based on the following critical parameters:

• Resistance Value: 1.2 kOhms (exact match required)
• Tolerance: ±1% (ensures precision equivalent to original)
• Power Rating: 3W (maintains thermal and electrical performance)
• Composition: Wirewound (preserves frequency response and stability characteristics)
• Package Type: Axial (ensures mechanical and electrical compatibility in existing PCB layouts)
• Termination Count: 2 (maintains circuit connectivity requirements)

The Vishay Dale ALSR031K200FE12 meets all substitution criteria with identical electrical specifications and compatible axial packaging.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 43F1K2 and Vishay Dale ALSR031K200FE12 are active production components with identical core electrical specifications: 1.2 kOhms resistance, ±1% tolerance, and 3W power rating in wirewound axial configuration.

The Vishay Dale ALSR031K200FE12 offers ROHS3 compliance, whereas the Ohmite 43F1K2 is RoHS non-compliant. For applications requiring RoHS certification, the Vishay Dale substitute is the appropriate selection. The Vishay Dale part features moisture-resistant construction and operates across -65°C to 250°C, compared to the Ohmite part's unspecified operating temperature range.

Physical dimensions differ: the Ohmite part measures 0.220" diameter by 0.594" length, while the Vishay Dale substitute is smaller at 0.180" diameter by 0.500" length. This dimensional difference must be evaluated for PCB layout compatibility, though both maintain standard axial lead spacing for through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR031K200FE12 directly replace the Ohmite 43F1K2 in all applications?

A: Yes, for electrical circuit requirements. Both parts share identical resistance (1.2 kOhms), tolerance (±1%), power rating (3W), and wirewound axial construction. Physical dimensions differ slightly; verify PCB layout clearances before substitution.

Q: What is the significance of the temperature coefficient difference (±20ppm/°C vs ±30ppm/°C)?

A: The Ohmite part exhibits tighter temperature stability. For precision applications requiring minimal resistance drift across temperature ranges, the Ohmite 43F1K2 is preferred. For general-purpose applications, the Vishay Dale substitute is acceptable.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a regulatory and material composition requirement, not an electrical performance specification. The Vishay Dale ROHS3-compliant part performs identically electrically to the non-compliant Ohmite part.

Q: Are the axial lead configurations identical between these parts?

A: Both parts use standard axial through-hole leads with 2 terminations. Lead diameter and spacing are compatible with standard PCB hole patterns, though the overall component body dimensions differ.

Q: What is the moisture-resistant feature on the Vishay Dale part?

A: Moisture-resistant construction reduces susceptibility to humidity-induced resistance drift and corrosion. This feature is beneficial in high-humidity or outdoor environments but does not affect electrical performance in standard indoor conditions.