Ohmite 45J20RE 5W 20 Ohms ±5% Axial Wirewound Resistor

Part Overview

The Ohmite 45J20RE is a 5W through-hole axial wirewound resistor rated at 20 Ohms with ±5% tolerance. This component is part of the Ohmicone® 40 series and is actively manufactured. The 45J20RE is specified for applications requiring moderate power dissipation in compact axial form factor across a wide operating temperature range of -55°C to 275°C. Substitute parts may be required due to inventory constraints, packaging preferences, or tolerance specifications for precision circuit requirements.

Substiute Parts

45J20RE

OhmiteIn Stock: 96445J20RE Datasheet

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45F20RE

OhmiteIn Stock: 88945F20RE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The Ohmite 45F20RE qualifies as a direct substitute for the 45J20RE based on the following critical parameters:

• Resistance Value: Both parts are rated at 20 Ohms, ensuring identical nominal resistance
• Power Rating: Both are 5W components, maintaining equivalent thermal and power dissipation characteristics
• Composition: Both are wirewound resistors with identical temperature coefficient (±20ppm/°C)
• Operating Temperature Range: Both operate across -55°C to 275°C
• Package Type: Both use axial through-hole configuration with identical physical dimensions (0.343" Dia × 0.937" L)
• Compliance: Both are RoHS Compliant with MSL 1 rating

The primary difference is tolerance specification: the 45F20RE offers ±1% tolerance compared to the 45J20RE's ±5% tolerance. This represents an upgrade in precision capability while maintaining all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 45J20RE and 45F20RE are active production components from Ohmite with full RoHS compliance and MSL 1 rating, making them suitable for standard industrial and commercial applications. The 45F20RE provides tighter tolerance control (±1% versus ±5%), which may be advantageous in precision circuit designs where resistance value accuracy directly impacts circuit performance. Selection between these parts should be based on tolerance requirements of the specific application and packaging availability (box versus bulk).

Frequently Asked Questions (FAQ)

Q: Can the 45F20RE replace the 45J20RE in existing designs? A: Yes. Both parts share identical resistance value, power rating, composition, operating temperature range, and physical dimensions. The 45F20RE's superior tolerance (±1%) makes it a direct functional substitute.

Q: What is the primary difference between these two parts? A: The tolerance specification differs. The 45J20RE is rated at ±5% tolerance, while the 45F20RE is rated at ±1% tolerance. All other electrical and mechanical parameters are identical.

Q: Are both parts suitable for high-temperature applications? A: Yes. Both the 45J20RE and 45F20RE operate across the full temperature range of -55°C to 275°C with identical temperature coefficient characteristics (±20ppm/°C).

Q: Do these parts have the same physical footprint? A: Yes. Both components have identical axial dimensions of 0.343" diameter by 0.937" length (8.70mm × 23.80mm), ensuring direct mechanical compatibility in PCB layouts.

Q: Are there any compliance differences between these parts? A: No. Both parts are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity rating and carry identical regulatory certifications.

Q: Which part should I specify for precision applications? A: The 45F20RE with ±1% tolerance is appropriate for applications requiring tighter resistance value accuracy. The 45J20RE with ±5% tolerance is suitable for general-purpose applications where tolerance is less critical.