Equivalent & Substitute Parts for 1.8RDL

Part Overview

The 1.8RDL is a red diffused LED with 1.8mm diameter lens designed for through-hole mounting applications. This component is classified as obsolete, indicating it is no longer in active production. The 1.8RDL serves as a red indication light in discrete LED applications with a forward voltage of 2.1V and a brightness rating of 1 millicandela at 2mA test current.

Due to its obsolete status, sourcing the 1.8RDL from original inventory may become increasingly difficult. Identifying compatible substitute parts ensures design continuity and supply chain reliability for applications currently using this component.

Substiute Parts

1.8RDL

Bivar Inc.In Stock: 8051.8RDL Datasheet

Current PartRFQ

1.8RD

Bivar Inc.In Stock: 11031.8RD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1.8RD is identified as a substitute for the 1.8RDL based on the following substitution criteria:

Matching Parameters (Substitution Basis):

• Lens size: 1.80mm diameter
• Mounting type: Through hole radial configuration
• Forward voltage: 2.1V typical
• Lens color and transparency: Red diffused
• Peak wavelength: 700nm
• Viewing angle: 50°
• Moisture sensitivity level: MSL 1 (Unlimited)
• Manufacturer: Bivar Inc.

Differing Parameters (Design Considerations):

• Millicandela rating: 1.8RDL rated at 1mcd; 1.8RD rated at 2mcd
• Test current: 1.8RDL tested at 2mA; 1.8RD tested at 20mA
• Height: 1.8RDL maximum 3.50mm; 1.8RD maximum 3.00mm
• Product status: 1.8RDL is obsolete; 1.8RD is active
• Packaging: 1.8RDL uses standard packaging; 1.8RD supplied in bulk

The 1.8RD operates at higher brightness and current levels while maintaining identical electrical and optical specifications for forward voltage, wavelength, and viewing angle. The reduced maximum height of the 1.8RD may provide advantages in space-constrained applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 1.8RD

The 1.8RD is the appropriate substitute for the obsolete 1.8RDL based on the following engineering factors:

1. Supply Continuity: The 1.8RD maintains active product status with 996 pieces in current inventory, ensuring reliable sourcing compared to the obsolete 1.8RDL.

2. Electrical Compatibility: Both parts share identical forward voltage (2.1V) and wavelength specifications (700nm), eliminating the need for circuit redesign or current-limiting resistor recalculation.

3. Mechanical Compatibility: Identical lens diameter (1.80mm) and through-hole radial mounting configuration ensure direct PCB fit without layout modifications.

4. Optical Compatibility: Both parts feature red diffused lenses with 50° viewing angles, maintaining consistent visual output in indication applications.

5. Compliance: Both parts meet MSL 1 moisture sensitivity requirements and share identical ECCN and HTSUS classifications.

Design Considerations for Implementation:

• The 1.8RD operates at 2mcd brightness compared to the 1.8RDL at 1mcd. Verify that the increased brightness is acceptable for the application or implement appropriate current limiting if dimmer output is required.

• The 1.8RD maximum height is 3.00mm versus 3.50mm for the 1.8RDL. Confirm that the reduced height does not create clearance issues within the enclosure or mechanical assembly.

• The 1.8RD is supplied in bulk packaging, which may affect procurement quantities and inventory management compared to standard packaging of the 1.8RDL.

Frequently Asked Questions (FAQ)

Q: Can the 1.8RD be used as a direct replacement for the 1.8RDL without circuit modifications?

A: Yes. Both parts have identical forward voltage (2.1V) and wavelength (700nm) specifications. The current-limiting resistor value calculated for the 1.8RDL will function correctly with the 1.8RD. However, the increased brightness of the 1.8RD (2mcd versus 1mcd) may be visually noticeable in the application.

Q: What is the significance of the different millicandela ratings between these parts?

A: The 1.8RDL is rated at 1mcd while the 1.8RD is rated at 2mcd. This indicates the 1.8RD produces approximately twice the light output under its specified test conditions. For applications where brightness is critical, this difference must be evaluated. If dimmer output is required, additional current limiting may be implemented.

Q: Are there any physical fit concerns when substituting the 1.8RD for the 1.8RDL?

A: The 1.8RD has a maximum height of 3.00mm compared to 3.50mm for the 1.8RDL. This 0.50mm reduction in height should not affect standard PCB mounting but must be verified if the LED is mounted near low-clearance components or within a confined enclosure space.

Q: Why do the test current specifications differ between these parts?

A: The 1.8RDL is tested at 2mA while the 1.8RD is tested at 20mA. These are the standard test conditions used to measure brightness (millicandela rating) for each part. The forward voltage of 2.1V remains constant regardless of test current, so circuit design is not affected by this difference.

Q: Is the 1.8RD available in the same packaging as the 1.8RDL?

A: The 1.8RDL uses standard packaging while the 1.8RD is supplied in bulk packaging. This may affect procurement processes and inventory management. Confirm packaging requirements with your supply chain before finalizing the substitution.

Q: What is the advantage of using the 1.8RD over the 1.8RDL?

A: The primary advantage is supply continuity. The 1.8RD maintains active product status with current inventory availability, whereas the 1.8RDL is obsolete and subject to limited stock. Both parts are electrically and optically compatible for red indication applications.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts share identical ECCN (EAR99), HTSUS (8541.41.0000), and MSL 1 classifications. The 1.8RD includes RoHS3 compliance certification, which is not specified for the 1.8RDL.