45J33RE Equivalent & Substitute Parts

Part Overview

The 45J33RE is a 33 Ohms ±5% 5W through-hole resistor manufactured by Ohmite in the Ohmicone® 40 series. This axial wirewound resistor is designed for applications requiring moderate power dissipation with standard tolerance specifications. The part is currently active in production with 990 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained while offering improved tolerance or packaging advantages.

Substiute Parts

45J33RE

OhmiteIn Stock: 106445J33RE Datasheet

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45F33RE

OhmiteIn Stock: 185945F33RE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 45F33RE qualifies as a direct substitute for the 45J33RE based on the following criteria:

Maintained Parameters:

• Resistance value: 33 Ohms (identical)
• Power rating: 5W (identical)
• Composition: Wirewound (identical)
• Package type: Axial (identical)
• Physical dimensions: 0.343" Dia x 0.937" L (identical)
• Temperature coefficient: ±20ppm/°C (identical)
• Operating temperature range: -55°C to 275°C (identical)
• RoHS compliance: Yes (identical)
• Moisture sensitivity level: 1 (identical)

Improved Parameter:

• Tolerance: ±1% (upgraded from ±5%)

The 45F33RE maintains all critical electrical and mechanical specifications while providing tighter tolerance, making it suitable for applications where improved accuracy is beneficial without requiring design modifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 45J33RE and 45F33RE are active production parts from Ohmite with full RoHS compliance and identical environmental ratings. Selection between these parts depends on circuit tolerance requirements:

• 45J33RE is appropriate for applications where ±5% tolerance meets design specifications and cost optimization is prioritized.
• 45F33RE is appropriate for applications requiring tighter tolerance control at ±1%, with identical form factor and thermal characteristics enabling direct substitution without PCB redesign.

Both parts maintain the same operating temperature range (-55°C to 275°C), moisture sensitivity classification, and axial package dimensions, ensuring mechanical and thermal compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the 45F33RE replace the 45J33RE in an existing design? A: Yes. The 45F33RE is mechanically and electrically compatible with identical dimensions, power rating, temperature range, and composition. The only difference is improved tolerance (±1% vs ±5%).

Q: What is the primary difference between these parts? A: The 45F33RE offers ±1% tolerance compared to the 45J33RE's ±5% tolerance. All other specifications, including resistance value, power rating, package type, and operating temperature range, are identical.

Q: Are both parts RoHS compliant? A: Yes, both the 45J33RE and 45F33RE are RoHS compliant with identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: Do these parts have the same physical dimensions? A: Yes, both parts measure 0.343" diameter by 0.937" length (8.70mm x 23.80mm) in axial configuration, ensuring identical PCB footprint and mounting requirements.

Q: What is the temperature coefficient for both parts? A: Both parts have a temperature coefficient of ±20ppm/°C and operate across the same temperature range of -55°C to 275°C.