Ohmite 805F25RE Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite 805F25RE is a 25 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series, designed for applications requiring precision current limiting and power dissipation in compact form factors. This component is actively manufactured and ROHS3 compliant. Substitute parts are identified for applications requiring higher power ratings, extended temperature ranges, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

805F25RE

OhmiteIn Stock: 1133805F25RE Datasheet

Current PartRFQ

RH00525R00FE02

Vishay DaleIn Stock: 1173RH00525R00FE02 Datasheet

DirectRFQ

TMC00525R00FE02

Vishay DaleIn Stock: 1225TMC00525R00FE02 Datasheet

UpgradeRFQ

UAL5-25RF8

RiedonIn Stock: 937UAL5-25RF8 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 805F25RE are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 25 Ohms
• Tolerance: ±1%
• Temperature coefficient: ±20ppm/°C
• Composition: Wirewound

Mechanical Parameters (Must Match):

• Mounting feature: Flanges
• Lead style: Solder Lugs
• Package type: Axial, Box
• Housing type: Aluminum
• Physical dimensions: 0.600" L x 0.646" W (within tolerance)

Allowable Variations:

• Power rating: May be equal or higher than 5W
• Operating temperature range: May be equal or extended
• Packaging format: Bulk or Tray acceptable
• Moisture resistance features: Acceptable as enhancement

The three identified substitutes (RH00525R00FE02, TMC00525R00FE02, UAL5-25RF8) meet all mandatory electrical and mechanical parameters while offering enhanced power ratings (7.5W) and maintained compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitute (RH00525R00FE02): The Vishay Dale RH00525R00FE02 provides direct electrical and mechanical compatibility with enhanced 7.5W power rating. This part maintains the same operating temperature floor (-55°C) with a 25°C reduction in maximum temperature (250°C vs. 275°C). Moisture-resistant coating is included. ROHS3 and REACH compliance are confirmed. Selection is appropriate for applications where the 250°C upper limit is acceptable and higher power dissipation capacity is beneficial.

Upgrade Substitute (TMC00525R00FE02): The Vishay Dale TMC00525R00FE02 from the TMC series offers identical electrical specifications to RH00525R00FE02 with 7.5W power rating and moisture resistance. Operating temperature range is -55°C ~ 250°C. ROHS3 compliance is confirmed; REACH status is listed as Vendor Undefined. Selection is appropriate where Vishay Dale sourcing is preferred and REACH status clarification is not critical.

Extended Temperature Substitute (UAL5-25RF8): The Riedon UAL5-25RF8 maintains full electrical compatibility with 7.5W power rating and extends the maximum operating temperature to 275°C, matching the original 805F25RE specification. Additional features include current sense capability, flame proof construction, pulse withstanding, and safety certifications. ROHS3 and REACH compliance are confirmed. MSL rating is 1 (Unlimited). Selection is appropriate for applications requiring the full -55°C ~ 275°C temperature range or enhanced safety features.

Frequently Asked Questions (FAQ)

Q: Can the 805F25RE be replaced with a 7.5W rated substitute? A: Yes. All three identified substitutes provide 7.5W power rating while maintaining the same 25 Ohms ±1% resistance and ±20ppm/°C temperature coefficient. Higher power rating does not compromise electrical performance in applications designed for 5W operation.

Q: What is the primary difference between the three substitutes? A: RH00525R00FE02 and TMC00525R00FE02 are both Vishay Dale parts with identical electrical specifications but differ in series designation and REACH documentation status. UAL5-25RF8 (Riedon) maintains the full -55°C ~ 275°C temperature range of the original part and includes additional safety features. All three meet the core substitution criteria.

Q: Does operating temperature range affect substitution compatibility? A: Operating temperature range is a specification parameter, not a substitution barrier. RH00525R00FE02 and TMC00525R00FE02 operate to 250°C maximum, which is acceptable for applications not requiring the full 275°C upper limit. UAL5-25RF8 maintains the original 275°C specification. Selection depends on application thermal requirements.

Q: Are all substitutes ROHS3 compliant? A: Yes. All three substitute parts carry ROHS3 Compliant status. The original 805F25RE is also ROHS3 Compliant. REACH compliance is confirmed for 805F25RE and UAL5-25RF8 (REACH Unaffected). TMC00525R00FE02 lists REACH status as Vendor Undefined.

Q: What is the physical dimension tolerance between parts? A: The 805F25RE measures 0.600" L x 0.646" W (15.24mm x 16.41mm). RH00525R00FE02 and TMC00525R00FE02 share identical dimensions. UAL5-25RF8 measures 0.598" L x 0.646" W (15.20mm x 16.40mm), a difference of 0.002" in length. This variation is within standard mechanical tolerance for flanged chassis mount resistors and does not affect mounting compatibility.

Q: Can moisture-resistant coating on substitute parts affect circuit performance? A: No. Moisture-resistant coating on RH00525R00FE02 and TMC00525R00FE02 is an enhancement that does not alter electrical characteristics. The ±1% tolerance, ±20ppm/°C temperature coefficient, and wirewound composition remain identical to the original 805F25RE.