FY5364X Yellow LED 5MM Round Through-Hole Equivalent & Substitute Parts

Part Overview

The FY5364X is a yellow 590nm LED indication component manufactured by Stanley Electric Co, configured as a discrete 1.9V radial through-hole device in a 5mm round T-1 3/4 package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. The FY5364X delivers 640mcd at 20mA test current with a 35° viewing angle and clear lens transparency, suitable for standard LED indication applications requiring yellow wavelength output.

Key Parameters

Parameter	FY5364X Value	Significance for Substitution
Manufacturer	Stanley Electric Co	Original source; obsolete status
Color	Yellow	Primary functional requirement
Wavelength - Dominant	590nm	Defines yellow spectrum; critical for visual matching
Lens Size	5mm, T-1 3/4	Physical form factor; determines PCB footprint compatibility
Voltage - Forward (Vf)	1.9V	Circuit design parameter; affects current-limiting resistor selection
Current - Test	20mA	Standard operating condition reference
Millicandela Rating	640mcd	Brightness specification; determines visibility requirements
Viewing Angle	35°	Optical dispersion characteristic; affects application suitability
Mounting Type	Through Hole	Assembly method; determines PCB design compatibility
Lens Transparency	Clear	Optical property; affects light transmission and color perception
Package / Case	Radial	Lead configuration; determines insertion and soldering method
Height (Max)	8.80mm	Physical clearance requirement; PCB assembly constraint
Product Status	Obsolete	Justifies need for active alternatives

Substitute Part Grouping Explanation

Substitution logic for the FY5364X is based on the following critical parameters:

Primary Compatibility Criteria:

Color: Yellow (589–592nm dominant wavelength range acceptable)
Lens Size: 5mm, T-1 3/4 form factor
Mounting Type: Through Hole, Radial configuration
Lens Transparency: Clear
Lens Style: Round with Domed Top
Package / Case: Radial

Secondary Compatibility Criteria:

Voltage - Forward (Vf): 1.9V–2.1V range (circuit design tolerance)
Current - Test: 10mA–20mA (standard operating window)
Viewing Angle: 35°–50° (application-dependent visibility)
Millicandela Rating: 40mcd–10000mcd (brightness scaling acceptable within application limits)

Compliance & Status:

Product Status: Active preferred; obsolete acceptable only for legacy support
RoHS Status: ROHS3 Compliant preferred for new designs
REACH Status: REACH Unaffected acceptable

Substitute parts are grouped into two categories:

Category A: Direct Electrical & Optical Equivalents Parts matching yellow wavelength (585–592nm), 5mm T-1 3/4 form factor, clear lens, and forward voltage within 1.9V–2.1V range. These parts maintain functional compatibility with minimal circuit redesign.

Category B: Form Factor Equivalents with Brightness Variation Parts matching physical dimensions and mounting but with different millicandela ratings or viewing angles. These require application-level brightness assessment but maintain PCB compatibility.

Parameter Comparison

Parameter	FY5364X	383-2UYC/S400-A6	383-2UYC/S400-A7	383-2UYC/S400-A9	383-2UYC/S530-A3	383-2UYC/S530-A4	HLMP-3451	LTL-307YE	SLI-560YT3F
Manufacturer	Stanley Electric Co	Everlight Electronics	Everlight Electronics	Everlight Electronics	Everlight Electronics	Everlight Electronics	Broadcom Limited	Lite-On Inc.	Rohm Semiconductor
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant (nm)	590	589	589	589	589	589	585	588	591
Lens Size	5mm, T-1 3/4	5.00mm Dia	5.00mm Dia	5.00mm Dia	5.00mm Dia	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4
Voltage - Forward (Vf) (V)	1.9	2.0	2.0	2.0	2.0	2.0	2.0	2.1	1.9
Current - Test (mA)	20	20	20	20	20	20	10	20	20
Millicandela Rating (mcd)	640	8000	8500	10000	4263	6300	3.6	40	1000
Viewing Angle (°)	35	6	6	6	6	6	50	40	40
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Diffused	Clear	Clear
Lens Color	Yellow	Colorless	Colorless	Colorless	Colorless	Colorless	Yellow	Yellow	Colorless
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max) (mm)	8.80	8.90	8.90	8.90	8.90	8.90	6.35	8.60	7.70
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	725 Pcs	1128 Pcs	781 Pcs	708 Pcs	966 Pcs	644 Pcs	20818 Pcs	7617 Pcs	2467 Pcs

Engineering Selection Recommendations

For New Designs (Preferred Substitutes):

The Everlight Electronics 383-2UYC/S400 series (parts A6, A7, A9) and 383-2UYC/S530 series (parts A3, A4) are recommended as primary substitutes. These parts are active, ROHS3 compliant, and maintain the 5mm T-1 3/4 form factor with clear lens transparency. Forward voltage ranges from 2.0V, requiring minimal circuit adjustment from the FY5364X 1.9V specification. Brightness ratings (4263–10000mcd) exceed the FY5364X 640mcd, providing enhanced visibility margin. Viewing angles of 6° provide narrow-beam characteristics suitable for focused indication applications. High inventory availability (644–1128 pcs) supports production continuity.

For Legacy Support (Secondary Substitutes):

The Lite-On LTL-307YE and Rohm SLI-560YT3F maintain yellow wavelength output (588nm, 591nm respectively) and 5mm T-1 3/4 form factor. The LTL-307YE operates at 2.1V forward voltage with 40mcd brightness and 40° viewing angle. The SLI-560YT3F matches the FY5364X forward voltage (1.9V) exactly, minimizing circuit redesign, with 1000mcd brightness and 40° viewing angle. Both are active and ROHS3 compliant.

For Brightness-Reduced Applications:

The Broadcom HLMP-3451 provides the lowest brightness option (3.6mcd) with diffused lens transparency and 50° wide viewing angle. This part is suitable only for applications where the FY5364X 640mcd brightness exceeds requirements. Forward voltage is 2.0V; test current is 10mA (lower than FY5364X 20mA specification). Extensive inventory (20818 pcs) supports high-volume applications.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for new product designs. The FY5364X obsolete status and unspecified RoHS compliance make transition to active alternatives necessary for long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q1: Can the 383-2UYC/S400-A7 directly replace the FY5364X without circuit modification?

The 383-2UYC/S400-A7 operates at 2.0V forward voltage compared to the FY5364X 1.9V. This 0.1V difference requires recalculation of the current-limiting resistor value. Using Ohm's law with the same supply voltage and 20mA test current, the resistor value will decrease slightly. Verify the resistor power rating remains adequate. No other circuit modifications are required; the 5mm T-1 3/4 form factor and through-hole radial package are identical.

Q2: Why do the Everlight 383-2UYC/S400 series parts have 6° viewing angles while the FY5364X has 35°?

Viewing angle is determined by lens design and internal LED chip geometry. The Everlight parts use a narrow-beam optical design (6°) compared to the FY5364X medium-beam design (35°). For applications requiring wide-angle visibility, the LTL-307YE (40°) or SLI-560YT3F (40°) are more suitable. For focused indication applications, the narrow 6° beam reduces stray light and improves contrast.

Q3: The FY5364X is listed as obsolete. What is the recommended long-term strategy?

Transition to an active substitute part for new designs and production runs. The Everlight 383-2UYC/S400-A7 or 383-2UYC/S530-A4 are recommended due to active product status, ROHS3 compliance, high inventory availability, and electrical compatibility within acceptable circuit design tolerances. Maintain FY5364X stock only for legacy product support where design changes are not feasible.

Q4: Can I use the HLMP-3451 as a substitute if brightness is not critical?

The HLMP-3451 is suitable only for applications where the FY5364X 640mcd brightness significantly exceeds requirements. The HLMP-3451 delivers only 3.6mcd, a 177× reduction in brightness. Additionally, the HLMP-3451 uses diffused lens transparency (versus FY5364X clear), affecting color perception and light distribution. Test current is 10mA (versus FY5364X 20mA), requiring circuit redesign. Use only if application specifications explicitly allow such brightness reduction.

Q5: What is the impact of wavelength differences between substitute parts?

Yellow wavelength ranges from 585nm (HLMP-3451) to 591nm (SLI-560YT3F), with the FY5364X at 590nm. These differences are within the human eye's yellow perception range and are not visually distinguishable in standard indication applications. Lens color (yellow versus colorless) has greater visual impact than wavelength variation within this range. For color-critical applications (e.g., traffic signals, medical devices), conduct visual comparison testing before production release.

Q6: Are the Everlight 383-2UYC/S530 series parts interchangeable with the 383-2UYC/S400 series?

Both series use identical 5mm T-1 3/4 form factor, through-hole radial mounting, and 2.0V forward voltage. The primary difference is millicandela rating: S400 series ranges from 8000–10000mcd, while S530 series ranges from 4263–6300mcd. Both are electrically and mechanically interchangeable; selection depends on brightness requirements. The S530 series provides lower brightness with reduced power consumption, suitable for battery-powered applications.

Q7: What packaging options are available for substitute parts?

The Everlight 383-2UYC/S400 and 383-2UYC/S530 series are supplied in Bulk packaging. The Broadcom HLMP-3451, Lite-On LTL-307YE, and Rohm SLI-560YT3F are also supplied in Bulk. The Rohm SLR-56DCT32 is supplied in Tape & Box (TB) format for automated assembly. Verify packaging compatibility with your assembly process before procurement.

Q8: Do all substitute parts meet current regulatory compliance?

All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current EU and international regulatory requirements. The FY5364X does not specify RoHS compliance, making transition to compliant alternatives necessary for new product designs and markets with regulatory requirements. Verify compliance documentation with your supplier before design release.

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