Ohmite 43F6K8 Equivalent & Substitute Parts

Part Overview

The Ohmite 43F6K8 is a 6.8 kOhms ±1% 3W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part is currently active in production with 746 units in stock. Substitute parts are identified when the original manufacturer part becomes unavailable, when alternative compliance certifications are required, or when design specifications allow for functionally equivalent alternatives that meet the same electrical and mechanical requirements.

Substiute Parts

43F6K8

OhmiteIn Stock: 82643F6K8 Datasheet

Current PartRFQ

ALSR036K800FE12

Vishay DaleIn Stock: 4362ALSR036K800FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 43F6K8 are qualified based on the following critical parameters:

• Electrical Match: Resistance value of 6.8 kOhms with ±1% tolerance
• Power Capacity: 3W minimum power rating
• Package Configuration: Axial through-hole wirewound resistor with 2 terminations
• Composition: Wirewound construction for stability and precision
• Temperature Coefficient: Performance within ±30ppm/°C or better

The Vishay Dale ALSR036K800FE12 meets all substitution criteria. While it exhibits a slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C), this remains within acceptable tolerance for most applications requiring 6.8 kOhms ±1% 3W axial resistors. The substitute part includes moisture-resistant construction and operates across an extended temperature range of -65°C to 250°C.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 43F6K8: Select this part when the original specification is required and RoHS non-compliant components are acceptable for the application. This part maintains the tightest temperature coefficient specification at ±20ppm/°C.

Vishay Dale ALSR036K800FE12: Select this substitute when ROHS3 compliance is required or when moisture-resistant construction is beneficial for the operating environment. The slightly larger temperature coefficient (±30ppm/°C) remains within acceptable limits for standard precision applications. The compact physical dimensions (0.180" diameter versus 0.220") may provide layout advantages in space-constrained designs. This part is suitable for extended temperature operation from -65°C to 250°C.

Both parts share identical electrical core specifications (6.8 kOhms ±1%, 3W, wirewound, axial package) and are functionally interchangeable from an electrical standpoint. Selection between them depends on compliance requirements, environmental conditions, and physical space constraints.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR036K800FE12 directly replace the Ohmite 43F6K8?

A: Yes, from an electrical standpoint. Both parts provide 6.8 kOhms ±1% at 3W with wirewound axial construction. The Vishay part has a slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and smaller physical dimensions. Verify that your circuit design tolerates these differences before substitution.

Q: What is the primary difference between these two parts?

A: The main differences are RoHS compliance status (Vishay is ROHS3 compliant; Ohmite is not), physical size (Vishay is more compact), temperature coefficient specification (Vishay is ±30ppm/°C), and moisture resistance (Vishay includes this feature). Electrical performance at rated conditions is equivalent.

Q: Are the physical dimensions compatible for PCB layout?

A: The Vishay part is physically smaller (0.180" diameter x 0.500" length versus 0.220" diameter x 0.594" length). While both are axial packages with 2 terminations, verify that the smaller Vishay component fits your PCB layout and that lead spacing is compatible with your design.

Q: Which part should I use for new designs?

A: For new designs, the Vishay Dale ALSR036K800FE12 is recommended due to ROHS3 compliance, moisture-resistant construction, and extended operating temperature range. The Ohmite 43F6K8 remains suitable for legacy designs or applications where RoHS non-compliant components are explicitly required.

Q: What does the temperature coefficient difference mean for my application?

A: Temperature coefficient indicates how much the resistance value changes with temperature. The Ohmite part changes ±20ppm/°C while the Vishay part changes ±30ppm/°C. For most applications, this difference is negligible. Only applications requiring extreme precision across wide temperature ranges need to account for this specification difference.