Ohmite 825F75R Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite 825F75R is a 75 Ohms ±1% 25W wirewound chassis mount resistor from the Metal-Mite®89 series, designed for high-power applications requiring precision resistance and thermal stability. This component features aluminum housing with flanged mounting and solder lug termination, suitable for operating temperatures from -55°C to 275°C.

The 825F75R is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this resistor specification.

Substiute Parts

825F75R

OhmiteIn Stock: 916825F75R Datasheet

Current PartRFQ

825F75RE

OhmiteIn Stock: 934825F75RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 825F75R is determined by strict equivalence across all critical electrical and mechanical parameters:

Key Substitution Criteria:

• Resistance value: 75 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 25W (exact match required)
• Composition: Wirewound (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Operating temperature range: -55°C to 275°C (exact match required)
• Housing type: Aluminum (exact match required)
• Mounting feature: Flanges (exact match required)
• Lead style: Solder Lugs (exact match required)
• Physical dimensions: 1.062" L x 1.094" W, 0.556" height (exact match required)

The substitute part 825F75RE meets all electrical and mechanical specifications identically to the main part, with the primary distinction being product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The 825F75RE is a direct functional equivalent to the 825F75R across all electrical and mechanical parameters. Selection between these parts is determined by application requirements and regulatory compliance:

825F75R (Obsolete): Suitable for legacy system maintenance where existing inventory is available and RoHS compliance is not a requirement. Current inventory: 872 pieces.

825F75RE (Active): Recommended for new designs, production continuity, and applications requiring RoHS3 compliance. This part maintains identical electrical and thermal performance while offering active product status and improved regulatory alignment. Current inventory: 836 pieces. Packaging in trays provides improved handling and organization for production environments.

Frequently Asked Questions (FAQ)

Q: Can the 825F75RE be used as a direct replacement for the 825F75R?

A: Yes. The 825F75RE is electrically and mechanically identical to the 825F75R. All critical parameters—resistance, tolerance, power rating, temperature coefficient, operating temperature range, housing type, mounting features, lead style, and physical dimensions—are identical between the two parts.

Q: What is the difference between the 825F75R and 825F75RE?

A: The primary differences are product status, packaging format, and RoHS compliance. The 825F75R is obsolete and RoHS non-compliant, packaged in bulk. The 825F75RE is an active product, ROHS3 compliant, and packaged in trays.

Q: Does the packaging difference affect electrical performance?

A: No. Packaging format (bulk versus tray) does not affect the electrical or thermal characteristics of the resistor. The difference is purely logistical and organizational.

Q: Is the 825F75RE suitable for applications originally designed for the 825F75R?

A: Yes, for all applications. The 825F75RE provides identical electrical performance and thermal stability. If the original application does not require RoHS compliance, either part is functionally equivalent. If RoHS compliance is required, the 825F75RE is the appropriate selection.

Q: Are there any thermal or reliability differences between these parts?

A: No. Both parts share identical temperature coefficients (±20ppm/°C), operating temperature ranges (-55°C to 275°C), and composition (wirewound aluminum housing). Thermal and reliability performance are equivalent.

Q: What should be considered when transitioning from 825F75R to 825F75RE?

A: Transition is straightforward due to identical mechanical and electrical specifications. Verify that tray packaging is compatible with your assembly process. Confirm that ROHS3 compliance aligns with your regulatory requirements. No circuit redesign or thermal analysis revision is necessary.