FY5366X LED Yellow Clear 5MM Round T/H Equivalent & Substitute Parts

Part Overview

The FY5366X 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 T-1 3/4 round package with domed top lens. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement continuity.

The FY5366X delivers 2000mcd at 20mA test current with a 10° viewing angle and 8.80mm maximum height. Substitution is required due to product discontinuation while maintaining functional compatibility in yellow LED indication applications.

Key Parameters

Parameter	FY5366X Value	Substitution Criticality
Color	Yellow	Critical
Wavelength - Dominant (nm)	590nm	Critical
Lens Size	5mm, T-1 3/4	Critical
Lens Style	Round with Domed Top	Critical
Lens Transparency	Clear	Critical
Mounting Type	Through Hole	Critical
Package / Case	Radial	Critical
Voltage - Forward (Vf) Typ (V)	1.9V	High
Current - Test (mA)	20mA	High
Millicandela Rating (mcd)	2000mcd	High
Viewing Angle (degrees)	10°	Medium
Height Max (mm)	8.80mm	Medium

Substitute Part Grouping Explanation

Substitution logic for the FY5366X is based on strict alignment of critical parameters: yellow color, 5mm T-1 3/4 through-hole radial package, clear lens transparency, and round domed-top lens style. All substitute parts must maintain these mechanical and optical characteristics to ensure PCB compatibility and visual indication functionality.

Secondary parameters including forward voltage (Vf), millicandela rating, and viewing angle are evaluated for circuit design compatibility. Wavelength dominance in the yellow spectrum (585nm to 592nm) is acceptable within industry standards for yellow LED indication applications.

The substitute parts are grouped into two categories:

Category A: Everlight Electronics 383-2UYC Series – Active status, ROHS3 compliant, 5mm round package, 2V forward voltage, 589nm dominant wavelength, 6° viewing angle, higher brightness ratings (4263mcd to 10000mcd).

Category B: Broadcom Limited HLMP Series – Active status, ROHS3 compliant, 5mm T-1 3/4 package, 2V to 2.1V forward voltage, 585nm dominant wavelength, wider viewing angles (24° to 35°), lower brightness ratings (50mcd to 140mcd).

Category C: Dialight 5219249F – Active status, ROHS3 compliant, 5mm round package, 2.1V forward voltage, 588nm dominant wavelength, 16° viewing angle, 90mcd brightness.

Parameter Comparison

Part Number	Manufacturer	Status	Color	Wavelength (nm)	Vf (V)	mcd	Viewing Angle	Height Max (mm)	Package
FY5366X	Stanley Electric	Obsolete	Yellow	590	1.9	2000	10°	8.80	5mm T-1 3/4 Radial
383-2UYC/S400-A6	Everlight	Active	Yellow	589	2.0	8000	6°	8.90	5.0mm Radial
383-2UYC/S400-A7	Everlight	Active	Yellow	589	2.0	8500	6°	8.90	5.0mm Radial
383-2UYC/S400-A9	Everlight	Active	Yellow	589	2.0	10000	6°	8.90	5.0mm Radial
383-2UYC/S530-A3	Everlight	Active	Yellow	589	2.0	4263	6°	8.90	5.0mm Radial
383-2UYC/S530-A4	Everlight	Active	Yellow	589	2.0	6300	6°	8.90	5mm T-1 3/4 Radial
5219249F	Dialight	Active	Yellow	588	2.1	90	16°	9.66	5.0mm Radial
HLMP-3416	Broadcom	Active	Yellow	585	2.0	50	35°	9.19	5mm T-1 3/4 Radial
HLMP-3490	Broadcom	Active	Yellow	585	2.1	55	24°	10.90	5mm T-1 3/4 Radial
HLMP-3850	Broadcom	Active	Yellow	585	2.1	140	24°	12.44	5mm T-1 3/4 Radial
HLMP-3850-K0002	Broadcom	Active	Yellow	585	2.1	140	24°	12.44	5mm T-1 3/4 Radial

Engineering Selection Recommendations

For Direct Mechanical and Optical Compatibility:

The 383-2UYC/S530-A4 (Everlight) provides the closest substitution profile to FY5366X. Both components share identical 5mm T-1 3/4 radial package geometry, clear lens transparency, and round domed-top lens style. The 383-2UYC/S530-A4 operates at 2.0V forward voltage (0.1V higher than FY5366X) and delivers 6300mcd brightness at 20mA test current, representing a 3.15x increase in luminous intensity. This part is active status with ROHS3 compliance and unlimited moisture sensitivity rating.

For Brightness-Matched Applications:

The 383-2UYC/S530-A3 (Everlight) delivers 4263mcd, providing intermediate brightness between the original 2000mcd and higher-output alternatives. This part maintains identical package, voltage, and wavelength characteristics as the S530-A4 variant.

For Wider Viewing Angle Requirements:

The HLMP-3416 (Broadcom) offers 35° viewing angle compared to FY5366X's 10°, suitable for applications requiring broader light distribution. This part maintains 5mm T-1 3/4 package compatibility and operates at 2.0V forward voltage. Brightness is significantly lower at 50mcd, requiring circuit design adjustment.

For Higher Brightness with Maintained Package:

The HLMP-3850 and HLMP-3850-K0002 (Broadcom) deliver 140mcd at 2.1V forward voltage in 5mm T-1 3/4 packages. The K0002 variant is supplied in Tape & Reel packaging for automated assembly. Height increases to 12.44mm; verify PCB clearance before selection.

Compliance Status:

All substitute parts are active status with ROHS3 compliance and REACH unaffected designation, matching the regulatory profile required for modern procurement.

Frequently Asked Questions (FAQ)

Q: Can the 383-2UYC/S400 series (A6, A7, A9) substitute for FY5366X?

A: The 383-2UYC/S400 series maintains yellow color, 589nm wavelength, 2.0V forward voltage, and 5.0mm round package compatibility. However, these parts specify 6° viewing angle versus FY5366X's 10°, and package designation differs from T-1 3/4 specification. Mechanical fit requires verification against PCB footprint design. Brightness ratings range from 8000mcd to 10000mcd, significantly exceeding original 2000mcd specification.

Q: What is the voltage difference impact between FY5366X (1.9V) and substitute parts (2.0V to 2.1V)?

A: The 0.1V to 0.2V forward voltage increase requires circuit design review. Series resistor values must be recalculated to maintain 20mA test current. For applications using current-limiting resistors, the voltage difference reduces available voltage across the resistor by 0.1V to 0.2V, requiring resistor value adjustment downward. For constant-current driver circuits, no modification is necessary.

Q: Are Broadcom HLMP parts suitable for direct FY5366X replacement?

A: Broadcom HLMP-3416, HLMP-3490, and HLMP-3850 series maintain 5mm T-1 3/4 radial package geometry and through-hole mounting. All operate in the yellow spectrum (585nm dominant wavelength). However, brightness ratings are significantly lower (50mcd to 140mcd versus 2000mcd), and viewing angles are wider (24° to 35° versus 10°). These parts are suitable only for applications where lower brightness and wider viewing angle are acceptable or beneficial.

Q: What is the difference between HLMP-3850 and HLMP-3850-K0002?

A: Both parts are electrically and optically identical, delivering 140mcd at 2.1V forward voltage in 5mm T-1 3/4 packages with 12.44mm maximum height. The primary difference is packaging: HLMP-3850 is supplied in bulk, while HLMP-3850-K0002 is supplied in Tape & Reel (TR) format for automated pick-and-place assembly. Select based on manufacturing process requirements.

Q: Can I use Dialight 5219249F as a substitute?

A: The 5219249F maintains yellow color, 5mm round package, and through-hole mounting. Wavelength is 588nm (within yellow spectrum), and forward voltage is 2.1V. However, brightness is only 90mcd (22x lower than FY5366X), and viewing angle is 16°. This part is suitable only for applications where significantly reduced brightness is acceptable. Height is 9.66mm, slightly exceeding FY5366X's 8.80mm; verify PCB clearance.

Q: Which substitute part has the closest brightness match to FY5366X's 2000mcd?

A: The 383-2UYC/S530-A3 (Everlight) at 4263mcd is the closest available match, delivering approximately 2.1x the original brightness. The 383-2UYC/S530-A4 at 6300mcd provides higher brightness. Everlight 383-2UYC/S400-A6 at 8000mcd represents the highest brightness option. All three maintain compatible package and voltage specifications.

Q: Are there viewing angle considerations for substitution?

A: FY5366X specifies 10° viewing angle. Everlight 383-2UYC series parts specify 6° (narrower), suitable for focused indication applications. Broadcom HLMP-3416 specifies 35° (wider), suitable for broad-area visibility. Dialight 5219249F specifies 16° (moderate). Select based on application visibility requirements and PCB layout constraints.

Q: What is the maximum height constraint for substitution?

A: FY5366X maximum height is 8.80mm. Everlight 383-2UYC series parts are 8.90mm (0.1mm taller). Dialight 5219249F is 9.66mm. Broadcom HLMP-3416 is 9.19mm, HLMP-3490 is 10.90mm, and HLMP-3850 series is 12.44mm. Verify PCB clearance and component stacking requirements before selection, particularly for applications with height-constrained enclosures.

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