SLB-25VR3F Equivalent & Substitute Parts

Part Overview

The SLB-25VR3F is a red diffused through-hole LED manufactured by Rohm Semiconductor, designed for discrete indication applications. This component features a 630nm dominant wavelength with 1mcd brightness rating and operates at 2V forward voltage. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Substiute Parts

SLB-25VR3F

Rohm SemiconductorIn Stock: 713SLB-25VR3F Datasheet

Current PartRFQ

LTL-433HR

Lite-On Inc.In Stock: 948LTL-433HR Datasheet

SimilarRFQ

XSUR36D

SunLEDIn Stock: 983XSUR36D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLB-25VR3F is determined by the following critical parameters:

• Color: Red
• Lens Transparency: Diffused
• Mounting Type: Through Hole
• Package / Case: Radial
• Voltage - Forward (Vf) (Typ): 2V nominal
• Current - Test: 10mA
• Wavelength - Dominant: Red spectrum (617nm–630nm range)

The substitute parts identified maintain compatibility within these core electrical and mechanical parameters. Variations in millicandela rating, viewing angle, and exact wavelength are acceptable within the red LED indication category, provided forward voltage and mounting configuration remain consistent.

Parameter Comparison

Engineering Selection Recommendations

Both LTL-433HR and XSUR36D are active product alternatives to the obsolete SLB-25VR3F.

LTL-433HR maintains identical forward voltage (2V), lens size (5.00mm x 2.00mm), and mounting configuration. This part offers higher brightness (3.7mcd versus 1mcd) and comparable height (7.50mm versus 7.70mm). Product status is active with full ROHS3 compliance. This substitute is suitable for direct replacement in applications where the increased brightness and slightly narrower viewing angle (140° versus 160°) are acceptable.

XSUR36D operates at 1.9V forward voltage with a smaller lens size (3.00mm x 2.00mm) and reduced height (4.00mm). This part delivers higher brightness (3.8mcd) and operates within the red wavelength specification. Product status is active with ROHS3 compliance. This substitute is applicable where physical space constraints or lower forward voltage operation is beneficial, though the narrower viewing angle (100°) and smaller lens dimensions represent design trade-offs.

Both substitutes maintain through-hole radial mounting and MSL 1 rating, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LTL-433HR directly replace SLB-25VR3F without circuit modification?

A: LTL-433HR maintains identical forward voltage (2V) and test current (10mA), enabling direct substitution in most applications. The increased brightness (3.7mcd versus 1mcd) and slightly narrower viewing angle (140° versus 160°) should be evaluated against specific application requirements.

Q: What are the key differences between LTL-433HR and XSUR36D?

A: LTL-433HR matches the original lens size (5.00mm x 2.00mm) and height (7.50mm), while XSUR36D uses a smaller lens (3.00mm x 2.00mm) and lower profile (4.00mm). XSUR36D operates at 1.9V versus 2V, requiring circuit evaluation. Both offer higher brightness than the original part.

Q: Is XSUR36D suitable for applications requiring the original 160° viewing angle?

A: No. XSUR36D provides a 100° viewing angle compared to the original 160°. Applications requiring wide-angle visibility should prioritize LTL-433HR, which maintains 140° viewing angle.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both LTL-433HR and XSUR36D are ROHS3 compliant with MSL 1 rating, matching the original part's environmental and regulatory specifications.

Q: Can XSUR36D be used in space-constrained designs?

A: Yes. XSUR36D's reduced height (4.00mm) and smaller lens dimensions (3.00mm x 2.00mm) make it suitable for compact PCB layouts. Forward voltage (1.9V) and viewing angle (100°) must be verified against circuit and optical requirements.

Q: What is the wavelength difference between substitutes?

A: SLB-25VR3F operates at 630nm dominant wavelength. LTL-433HR operates at 623nm, and XSUR36D at 617nm. All remain within the red LED spectrum and are visually indistinguishable in typical indication applications.