FY3863X LED Yellow Clear 3MM Round T/H Equivalent & Substitute Parts

Part Overview

The FY3863X is a yellow 590nm LED indication component manufactured by Stanley Electric Co, configured as a discrete 1.9V radial through-hole device in a 3mm T-1 round domed lens package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing production and maintenance applications. The FY3863X delivers 720mcd at 20mA test current with a forward voltage of 1.9V typical, making it suitable for standard LED indication circuits requiring yellow wavelength output in the 590nm spectrum.

Due to obsolete product status, equivalent substitutes must maintain compatibility across critical electrical parameters (forward voltage, test current, wavelength), mechanical specifications (3mm T-1 form factor, through-hole mounting, radial package), and optical characteristics (yellow color, clear lens transparency, round domed lens style).

Key Parameters

Parameter	FY3863X Value	Specification Basis
Color	Yellow	Optical output requirement
Wavelength - Dominant	590nm	Spectral output specification
Wavelength - Peak	592nm	Peak emission specification
Voltage - Forward (Vf) Typical	1.9V	Circuit design parameter
Current - Test	20mA	Standard test condition
Millicandela Rating	720mcd	Luminous intensity specification
Lens Size	3mm, T-1	Physical form factor
Lens Style	Round with Domed Top	Optical and mechanical design
Lens Transparency	Clear	Optical transmission requirement
Mounting Type	Through Hole	PCB assembly method
Package / Case	Radial	Component lead configuration
Height (Max)	5.90mm	Physical clearance specification
RoHS Status	RoHS Compliant	Environmental compliance

Substitute Part Grouping Explanation

Substitution logic for the FY3863X is based on the following critical parameters that must align for functional equivalence:

Primary Substitution Criteria:

Color: Yellow (required for optical output compatibility)
Wavelength - Dominant: 590nm ±10nm range (acceptable spectral tolerance)
Lens Size: 3mm T-1 form factor (mechanical compatibility)
Mounting Type: Through Hole (assembly method compatibility)
Package / Case: Radial (lead configuration compatibility)
Lens Style: Round with Domed Top (optical and mechanical design)
Lens Transparency: Clear (optical transmission requirement)

Secondary Electrical Parameters:

Voltage - Forward (Vf): 1.9V to 2.1V range (circuit design tolerance)
Current - Test: 10mA to 20mA (standard test conditions)

Compliance Requirements:

RoHS Status: RoHS3 Compliant or RoHS Compliant (environmental regulation)
REACH Status: REACH Unaffected (chemical regulation)

Substitute parts are grouped into two categories:

Category A - Yellow LED Substitutes (Primary Equivalents): Parts matching yellow color, 590nm wavelength range, and 1.9V-2.1V forward voltage with 3mm T-1 through-hole radial configuration.

Category B - Alternative Wavelength Substitutes: Parts with different wavelengths (orange 605nm) or different electrical parameters that may require circuit redesign but maintain mechanical compatibility.

Parameter Comparison

Parameter	FY3863X	INL-3AY30	SLI-343YC3F	LTL1CHJSTNN	SLR-332YC3F	SLR-332YCT32
Manufacturer	Stanley Electric Co	Inolux	Rohm Semiconductor	Lite-On Inc.	Rohm Semiconductor	Rohm Semiconductor
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant (nm)	590	592	587	587	587	587
Wavelength - Peak (nm)	592	590	—	588	—	—
Voltage - Forward (Vf) Typical (V)	1.9	2.0	1.9	2.05	2.1	2.1
Current - Test (mA)	20	20	20	20	10	10
Millicandela Rating (mcd)	720	460	350	180	10	10
Lens Size	3mm, T-1	3mm, T-1	3.10mm Dia	3mm, T-1	3.20mm Dia	3.20mm Dia
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial
Height (Max) (mm)	5.90	5.08	5.60	5.20	4.60	4.60
Product Status	Obsolete	Active	Not For New Designs	Active	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	4462	58369	1593	875	2569	1180

Engineering Selection Recommendations

Tier 1 - Primary Substitutes (Recommended for Direct Replacement):

INL-3AY30 (Inolux) is the primary recommended substitute for FY3863X applications. This part maintains yellow color output at 592nm dominant wavelength (within 2nm of FY3863X 590nm specification), operates at 2.0V forward voltage (within 0.1V of original 1.9V), and delivers 460mcd at 20mA test current. The 3mm T-1 through-hole radial package provides mechanical compatibility with existing PCB layouts. INL-3AY30 holds active product status with ROHS3 compliance and demonstrates high inventory availability (58,369 pcs). Height specification of 5.08mm is within acceptable clearance tolerance relative to FY3863X 5.90mm maximum.

SLI-343YC3F (Rohm Semiconductor) provides secondary primary-tier substitution with matching 1.9V forward voltage and yellow 587nm wavelength output. This part delivers 350mcd at 20mA test current and maintains 3mm T-1 through-hole radial configuration. However, SLI-343YC3F carries "Not For New Designs" product status, limiting its suitability for new production applications despite active inventory (1,593 pcs).

Tier 2 - Secondary Substitutes (Conditional Application):

LTL1CHJSTNN (Lite-On Inc.) operates at 2.05V forward voltage with 587nm yellow wavelength and 180mcd output at 20mA test current. This part maintains 3mm T-1 through-hole radial configuration and active product status with ROHS3 compliance. Lower luminous intensity (180mcd versus FY3863X 720mcd) requires circuit evaluation for brightness-critical applications. Limited inventory (875 pcs) may constrain supply for high-volume requirements.

SLR-332YC3F and SLR-332YCT32 (Rohm Semiconductor) operate at reduced test current (10mA versus FY3863X 20mA) with significantly lower millicandela ratings (10mcd). These parts deliver 2.1V forward voltage and 587nm wavelength in 3.20mm diameter through-hole radial packages. Mechanical compatibility is maintained, but electrical parameter differences (forward voltage, test current, brightness) necessitate circuit redesign. Both parts hold active product status with ROHS3 compliance.

Tier 3 - Non-Recommended Substitutes:

HLMP-Y402-G0000 (Broadcom Limited) and SLR-332DC3F / SLR-332DCT32 (Rohm Semiconductor) are orange 605nm wavelength components. These parts do not meet primary substitution criteria due to wavelength mismatch (605nm versus required 590nm yellow specification). Application of orange LEDs in circuits designed for yellow indication produces incorrect optical output and is not recommended without complete circuit redesign and application validation.

Frequently Asked Questions (FAQ)

Q1: Can INL-3AY30 directly replace FY3863X without circuit modification?

A: INL-3AY30 provides direct mechanical and functional compatibility for most applications. The 2.0V forward voltage (versus FY3863X 1.9V) represents a 0.1V increase within typical circuit tolerance. Both parts operate at 20mA test current with yellow wavelength output (590nm to 592nm range). PCB layout compatibility is maintained through identical 3mm T-1 through-hole radial package configuration. Circuit validation is recommended for brightness-critical applications due to 460mcd output versus FY3863X 720mcd specification.

Q2: Why do SLR-332YC3F and SLR-332YCT32 have lower millicandela ratings than FY3863X?

A: SLR-332 series components operate at 10mA test current versus FY3863X 20mA specification. Luminous intensity (measured in millicandela) is directly proportional to forward current. At equivalent current levels, these parts would deliver higher brightness; however, the specified 10mcd rating reflects measurement at reduced 10mA test condition. Application of SLR-332 series requires circuit redesign to accommodate lower test current specification.

Q3: What is the significance of "Not For New Designs" product status for SLI-343YC3F?

A: "Not For New Designs" designation indicates that Rohm Semiconductor has discontinued active development and long-term support for this product line. While SLI-343YC3F remains available in current inventory (1,593 pcs), future availability cannot be guaranteed. For new production designs, INL-3AY30 or LTL1CHJSTNN are preferred due to active product status and manufacturer commitment to ongoing supply.

Q4: Are orange LED substitutes (HLMP-Y402-G0000, SLR-332DC3F) acceptable alternatives?

A: Orange LEDs (605nm wavelength) are not acceptable substitutes for yellow LED (590nm) applications. Wavelength differences produce visually distinct optical output that does not meet yellow indication requirements. Application of orange components in yellow-specified circuits results in incorrect color indication and is not recommended without complete application redesign and validation.

Q5: How do package variations (Bulk versus Tape & Box) affect substitution?

A: Package format (Bulk versus Tape & Box) affects supply chain logistics and assembly automation compatibility but does not impact electrical or optical performance. SLR-332YC3F (Bulk packaging) and SLR-332YCT32 (Tape & Box packaging) are electrically and optically identical components with different distribution formats. Selection between packaging options depends on assembly equipment capability and procurement requirements rather than functional compatibility.

Q6: What compliance certifications are required for substitute parts?

A: All recommended substitute parts maintain RoHS3 compliance and REACH Unaffected status, matching FY3863X environmental compliance requirements. ECCN classification (EAR99) and HTSUS code (8541.41.0000) are consistent across all substitute options, indicating equivalent export control and tariff classification. Compliance documentation should be verified with component suppliers for specific procurement applications.

Q7: Can FY3863X be used interchangeably with substitute parts in existing inventory?

A: FY3863X (obsolete status, 4,462 pcs available) can be used in applications currently specified for this component. However, for new procurement and long-term supply planning, active-status substitutes (INL-3AY30, LTL1CHJSTNN) are recommended. Mixing FY3863X and substitute parts in the same production batch is acceptable provided circuit design accommodates the 0.1V to 0.2V forward voltage variation and brightness differences across the millicandela range.

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