OF621JE Equivalent & Substitute Parts

Part Overview

The OF621JE is a 620 Ohms ±5% 0.5W through-hole axial resistor manufactured by Ohmite as part of the Little Demon® OF series. This carbon composition resistor features pulse withstanding capability and is housed in a standard axial package measuring 0.150" diameter by 0.406" length. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing maintenance, repair, and legacy system support applications.

Substiute Parts

OF621JE

OhmiteIn Stock: 721OF621JE Datasheet

Current PartRFQ

OF561KE

OhmiteIn Stock: 2027OF561KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OF621JE is determined by the following critical parameters:

Electrical Parameters: Resistance value, tolerance, and power rating form the primary substitution criteria. The OF621JE operates at 620 Ohms with ±5% tolerance and 0.5W power handling.

Mechanical Parameters: Package type (axial), physical dimensions (0.150" Dia x 0.406" L), and termination count (2) must remain consistent for direct board-level replacement without layout modification.

Material & Composition: Carbon composition construction and pulse withstanding capability define the functional class of this component.

Compliance & Environmental: RoHS3 compliance and MSL rating of 1 establish the environmental and regulatory baseline for acceptable substitutes.

The identified substitute OF561KE shares identical mechanical packaging, composition type, and compliance certifications. However, it differs in resistance value (560 Ohms versus 620 Ohms) and tolerance specification (±10% versus ±5%), representing a functional alternative rather than a direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

Both the OF621JE and OF561KE are obsolete products within the Ohmite Little Demon® OF series. Selection between these components depends on circuit-specific tolerance and resistance requirements.

The OF621JE provides tighter tolerance control at ±5%, suitable for applications requiring precise resistance values. The OF561KE offers broader tolerance at ±10% with a lower resistance value of 560 Ohms.

Both components maintain identical mechanical compatibility, power handling capacity, and environmental compliance certifications. The choice between them is determined by whether the circuit design can accommodate the 560 Ohm resistance value and ±10% tolerance specification in place of the original 620 Ohm ±5% specification.

Frequently Asked Questions (FAQ)

Q: Can OF561KE be used as a direct replacement for OF621JE?

A: Both components share identical axial packaging, physical dimensions, power rating, and compliance certifications. However, the resistance values differ (560 Ohms versus 620 Ohms) and tolerance specifications differ (±10% versus ±5%). Direct substitution is possible only if the circuit design tolerates these electrical parameter differences.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both OF621JE and OF561KE measure 0.150" diameter by 0.406" length and use standard axial through-hole terminations, ensuring mechanical compatibility on printed circuit boards.

Q: What is the significance of the tolerance difference?

A: The OF621JE specifies ±5% tolerance, providing tighter resistance value control. The OF561KE specifies ±10% tolerance, allowing greater variation from the nominal resistance value. Circuit applications sensitive to resistance accuracy may require the tighter tolerance of the OF621JE.

Q: Are both parts RoHS compliant?

A: Yes. Both OF621JE and OF561KE are ROHS3 compliant and carry MSL rating 1 (unlimited moisture sensitivity level), meeting current environmental and regulatory requirements.

Q: Why are both products classified as obsolete?

A: Obsolete status indicates these components are no longer in active production. Both parts remain available through inventory channels but are not manufactured for new orders.