43F75R Equivalent & Substitute Parts

Part Overview

The 43F75R is a 75 Ohm ±1% 3W axial wirewound through-hole resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part maintains active product status with 1155 units in current inventory. Substitute parts are necessary to address packaging preferences, compliance requirements, or supply chain considerations while maintaining electrical and mechanical compatibility.

Substiute Parts

43F75R

OhmiteIn Stock: 117543F75R Datasheet

Current PartRFQ

43F75RE

OhmiteIn Stock: 79643F75RE Datasheet

DirectRFQ

ALSR0375R00FE12

Vishay DaleIn Stock: 1192ALSR0375R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: resistance value (75 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), and package type (axial). All identified substitutes meet these core electrical and mechanical requirements.

The 43F75RE is a direct Ohmite manufacturer substitute with identical electrical specifications and package dimensions. The primary difference is packaging format (bulk versus standard) and enhanced RoHS compliance status.

The ALSR0375R00FE12 from Vishay Dale is a cross-manufacturer substitute that maintains all critical electrical parameters but features a smaller physical footprint (0.180" Dia x 0.500" L versus 0.220" Dia x 0.594" L) and includes moisture-resistant construction. The temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the primary part.

Parameter Comparison

Engineering Selection Recommendations

The 43F75RE serves as the primary substitute when RoHS compliance is required, offering identical electrical performance and physical dimensions with enhanced regulatory status. This part is suitable for direct replacement in applications where compliance documentation is necessary.

The ALSR0375R00FE12 is appropriate for applications requiring moisture-resistant construction and compact board space. The smaller physical footprint accommodates space-constrained layouts. The ±30ppm/°C temperature coefficient remains within acceptable tolerance for most applications, though designs with stringent temperature stability requirements should account for this 50% increase relative to the primary part.

Selection between 43F75RE and ALSR0375R00FE12 depends on physical space constraints and moisture exposure conditions. Both parts maintain full electrical compatibility with the 43F75R in terms of resistance value, tolerance, and power rating.

Frequently Asked Questions (FAQ)

Q: Can the 43F75RE be used as a direct replacement for the 43F75R? A: Yes. The 43F75RE is electrically and mechanically identical, with matching resistance (75 Ohms ±1%), power rating (3W), and physical dimensions (0.220" Dia x 0.594" L). The primary difference is packaging format and improved RoHS compliance status.

Q: What are the physical space implications of using the ALSR0375R00FE12? A: The ALSR0375R00FE12 has a smaller footprint (0.180" Dia x 0.500" L) compared to the 43F75R and 43F75RE (0.220" Dia x 0.594" L). This 15% reduction in length and 18% reduction in diameter allows installation in space-constrained applications. Verify PCB layout compatibility before substitution.

Q: Does the ALSR0375R00FE12 temperature coefficient affect circuit performance? A: The ALSR0375R00FE12 has a ±30ppm/°C temperature coefficient versus ±20ppm/°C for the 43F75R and 43F75RE. For a 75 Ohm resistor across a 100°C temperature range, this represents a maximum resistance change of 0.225 Ohms (43F75R/43F75RE) versus 0.225 Ohms (ALSR0375R00FE12). Evaluate circuit sensitivity to this variance based on application requirements.

Q: Are all substitute parts suitable for moisture-exposed environments? A: The ALSR0375R00FE12 includes moisture-resistant construction. The 43F75R and 43F75RE do not specify moisture-resistant features. For applications with moisture exposure, the ALSR0375R00FE12 is the appropriate selection.

Q: What compliance certifications apply to each part? A: The 43F75R is RoHS non-compliant. The 43F75RE is RoHS Compliant. The ALSR0375R00FE12 is ROHS3 Compliant. All three parts are classified as EAR99 for export control purposes.