FY3864X LED Yellow Clear 3MM Round T/H Equivalent & Substitute Parts

Part Overview

The FY3864X is a yellow 590nm LED indication component manufactured by Stanley Electric Co, configured as a discrete radial through-hole device in a 3mm round package with domed lens. This part is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing design requirements and production continuity. The FY3864X delivers 250mcd brightness at 1.9V forward voltage with 20mA test current, suitable for standard indication applications requiring yellow wavelength output.

Substiute Parts

FY3864X

Stanley Electric CoIn Stock: 816FY3864X Datasheet

Current PartRFQ

FHY3C84X

Stanley Electric CoIn Stock: 996FHY3C84X Datasheet

DirectRFQ

5219431F

DialightIn Stock: 24035219431F Datasheet

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HLMP-1420

Broadcom LimitedIn Stock: 25744HLMP-1420 Datasheet

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HLMP-1421

Broadcom LimitedIn Stock: 11697HLMP-1421 Datasheet

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HLMP-1421-F0002

Broadcom LimitedIn Stock: 729HLMP-1421-F0002 Datasheet

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HLMP-Y402-G0000

Broadcom LimitedIn Stock: 55788HLMP-Y402-G0000 Datasheet

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SLI-343YC3F

Rohm SemiconductorIn Stock: 1646SLI-343YC3F Datasheet

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SLR-332DC3F

Rohm SemiconductorIn Stock: 817SLR-332DC3F Datasheet

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SLR-332YC3F

Rohm SemiconductorIn Stock: 2671SLR-332YC3F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FY3864X is determined by the following critical parameters: color (yellow), lens size (3mm T-1), lens transparency (clear), mounting type (through hole), and package configuration (radial). The wavelength range (587nm–592nm dominant), forward voltage tolerance (1.9V–2.1V), and brightness rating (10mcd–350mcd) define functional compatibility bands. Parts are grouped into three categories:

Category 1: Direct Functional Equivalents – Yellow LEDs with 3mm T-1 package, clear lens, through-hole radial mounting, and wavelength within 587nm–592nm range. These parts maintain the same optical and electrical operating envelope as the FY3864X.

Category 2: Compatible Alternatives – Yellow LEDs with 3mm package, clear lens, through-hole mounting, and radial configuration, but with different forward voltage or brightness ratings. These require circuit verification for current-limiting resistor adjustment.

Category 3: Related Color Variants – Orange LEDs (605nm–610nm) with identical mechanical and mounting specifications. These are listed for reference but represent a different wavelength output and require application-specific validation.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SLI-343YC3F (Rohm Semiconductor)

The SLI-343YC3F provides the closest functional match to the FY3864X. Both components operate at 1.9V forward voltage with 20mA test current, share identical 3mm T-1 through-hole radial package configuration, and deliver yellow wavelength output (587nm dominant vs. 590nm). The SLI-343YC3F brightness rating of 350mcd exceeds the FY3864X specification of 250mcd, providing enhanced luminous intensity. Product status is "Not For New Designs," indicating mature technology suitable for legacy system support. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

Secondary Substitute: HLMP-1420 or HLMP-1421 (Broadcom Limited)

Both Broadcom components maintain 3mm T-1 through-hole radial configuration with clear yellow lens. Forward voltage is 2V (0.1V higher than FY3864X), requiring resistor recalculation in current-limiting circuits. Test current is 10mA (half the FY3864X specification), resulting in lower brightness at 15mcd. These parts are active products with ROHS3 compliance and full regulatory certification. HLMP-1421-F0002 offers tape & reel packaging for automated assembly environments.

Tertiary Substitute: 5219431F (Dialight)

The 5219431F maintains yellow color, clear lens, and through-hole radial mounting in 3mm package. Brightness is 30mcd at 20mA test current, significantly lower than FY3864X. Lens diameter is 2.90mm, slightly smaller than standard 3mm specification. Product status is active with ROHS3 compliance. This part is suitable for applications where reduced brightness is acceptable.

Not Recommended for Direct Substitution:

HLMP-Y402-G0000 is an orange LED (605nm dominant wavelength) and does not provide yellow output equivalent to FY3864X. SLR-332YC3F operates at 2.1V forward voltage with 10mA test current and 10mcd brightness, representing significant electrical and optical deviation from FY3864X specifications.

Frequently Asked Questions (FAQ)

Q1: Can the FY3864X be directly replaced with SLI-343YC3F without circuit modification?

A: Direct mechanical and optical replacement is possible. Both components operate at 1.9V forward voltage and 20mA test current with identical 3mm T-1 through-hole radial package. The higher brightness of SLI-343YC3F (350mcd vs. 250mcd) may require verification in light-sensitive applications but does not prevent substitution. No resistor recalculation is required.

Q2: What is the impact of substituting FY3864X with HLMP-1420?

A: HLMP-1420 requires circuit modification. Forward voltage increases from 1.9V to 2V, and test current decreases from 20mA to 10mA. Current-limiting resistor values must be recalculated to maintain proper LED operation. Brightness is significantly reduced to 15mcd. Mechanical fit is identical (3mm T-1 through-hole radial). This substitution is suitable only when reduced brightness is acceptable and circuit redesign is feasible.

Q3: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (5219431F, HLMP-1420, HLMP-1421, HLMP-1421-F0002, SLR-332YC3F) are ROHS3 compliant. SLI-343YC3F is also ROHS3 compliant but carries "Not For New Designs" status. The original FY3864X compliance status is not specified in available documentation.

Q4: Can HLMP-Y402-G0000 substitute for FY3864X?

A: No. HLMP-Y402-G0000 is an orange LED with 605nm dominant wavelength, not yellow. This represents a different color output and is not functionally equivalent to the FY3864X yellow indication requirement. This part is listed in the original FY3864X substitute reference but does not meet color specification criteria.

Q5: What packaging options are available for substitute parts?

A: Most substitute parts are supplied in bulk packaging. HLMP-1421-F0002 is available in tape & reel (TR) format for automated pick-and-place assembly. Bulk packaging is standard for 5219431F, HLMP-1420, HLMP-1421, SLI-343YC3F, and SLR-332YC3F. Packaging selection depends on production volume and assembly methodology.

Q6: How do viewing angles differ among substitute parts?

A: FY3864X provides 70° viewing angle. HLMP-1420 and HLMP-1421 offer 45° viewing angle, providing narrower light distribution. SLI-343YC3F delivers 40° viewing angle. SLR-332YC3F provides the widest distribution at 85°. Viewing angle selection depends on application requirements for light beam spread and visibility range.

Q7: What is the height difference between FY3864X and substitute parts?

A: FY3864X maximum height is 5.40mm. SLI-343YC3F is 5.60mm (0.2mm taller). HLMP-1420 and HLMP-1421 are 6.35mm (0.95mm taller). SLR-332YC3F is 4.60mm (0.8mm shorter). 5219431F is 5.89mm (0.49mm taller). Height differences may impact PCB layout and mechanical clearance in confined spaces.

Q8: Are all substitute parts REACH compliant?

A: Yes. All substitute parts listed carry "REACH Unaffected" status, indicating compliance with REACH regulations. The original FY3864X also has REACH Unaffected status.