FR3863X LED RED CLEAR 3MM ROUND T/H Equivalent & Substitute Parts

Part Overview

The FR3863X is a red 626nm LED indication component manufactured by Stanley Electric Co, designed for through-hole mounting in discrete applications. This part operates at 1.9V forward voltage with a 640mcd brightness rating and features a 3mm round domed lens with clear transparency. The FR3863X is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute components must maintain compatibility across electrical characteristics, mechanical form factor, and mounting specifications while meeting current compliance standards.

Key Parameters

Parameter	FR3863X Value	Substitution Relevance
Color	Red	Critical - Must match for visual indication consistency
Lens Transparency	Clear	Critical - Affects light transmission and appearance
Lens Size	3mm, T-1	Critical - Determines PCB footprint and mechanical fit
Voltage - Forward (Vf) (Typ)	1.9V	Important - Affects circuit design and current limiting requirements
Current - Test	20mA	Important - Baseline for brightness and power consumption
Mounting Type	Through Hole	Critical - Determines PCB assembly compatibility
Wavelength - Dominant	626nm	Important - Defines red color perception range
Millicandela Rating	640mcd	Important - Brightness specification for visibility requirements
Viewing Angle	40°	Important - Affects visibility cone and application suitability
Height (Max)	5.90mm	Important - PCB clearance and assembly considerations
Package / Case	Radial	Critical - Determines lead configuration and PCB layout
RoHS Status	RoHS Compliant	Important - Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitute parts for the FR3863X are evaluated based on the following substitution criteria:

Primary Matching Parameters:

Color: Red (all substitutes must be red)
Lens Transparency: Clear (optical transmission requirement)
Mounting Type: Through Hole (PCB assembly compatibility)
Package / Case: Radial (lead configuration)
Lens Size: 3mm, T-1 form factor (mechanical fit)

Secondary Compatibility Parameters:

Voltage - Forward (Vf): Acceptable range 1.9V to 2.1V (circuit design tolerance)
Current - Test: 10mA to 20mA (brightness and power consumption)
Wavelength - Dominant: 620nm to 643nm (red spectrum range)
Viewing Angle: 35° to 85° (application dependent)
Height (Max): 4.60mm to 6.10mm (PCB clearance)

Compliance Parameters:

RoHS Status: RoHS Compliant or ROHS3 Compliant (regulatory requirement)
REACH Status: REACH Unaffected or REACH Affected (environmental compliance)

Substitutes are grouped into two categories: Direct Electrical Equivalents (matching Vf and brightness characteristics) and Functional Alternatives (meeting core optical and mechanical requirements with acceptable parameter variations).

Parameter Comparison

Parameter	FR3863X	MT7403A-UR-A	HLMP-Y301-F0000	LTL-1CHEE	LTL1CHJETNN	SLR-332VC3F	SLR-332VCT32	SLI-343URC3F
Manufacturer	Stanley Electric Co	Marktech Optoelectronics	Broadcom Limited	Lite-On Inc.	Lite-On Inc.	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Color	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Diffused
Lens Size	3mm, T-1	3.00mm Dia	3mm, T-1	3.10mm Dia	3mm, T-1	3.20mm Dia	3.20mm Dia	3.10mm Dia
Voltage - Forward (Vf) (Typ)	1.9V	1.9V	2.1V	2V	2.05V	2V	2V	1.9V
Current - Test	20mA	20mA	20mA	20mA	20mA	10mA	10mA	20mA
Millicandela Rating	640mcd	200mcd	19mcd	19mcd	180mcd	10mcd	10mcd	450mcd
Viewing Angle	40°	35°	45°	45°	45°	85°	85°	40°
Wavelength - Dominant	626nm	643nm	626nm	625nm	624nm	630nm	630nm	620nm
Height (Max)	5.90mm	6.10mm	5.20mm	5.20mm	5.20mm	4.60mm	4.60mm	5.60mm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Not For New Designs
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Bulk	Bulk	Bulk	Bulk	Bulk	Tape & Box (TB)	Bulk

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Preferred for Replacement):

MT7403A-UR-A (Marktech Optoelectronics) is the closest electrical equivalent to FR3863X. Both components operate at 1.9V forward voltage with 20mA test current. MT7403A-UR-A provides 200mcd brightness compared to FR3863X's 640mcd, representing a 69% reduction in brightness. The viewing angle is 35° versus 40°, and wavelength is 643nm versus 626nm. Product status is Active with RoHS Compliant certification. This substitute is suitable for applications where brightness reduction is acceptable and circuit design remains unchanged.

Tier 2 - Functional Alternatives with Acceptable Variations:

LTL1CHJETNN (Lite-On Inc.) operates at 2.05V forward voltage with 20mA test current, providing 180mcd brightness. Wavelength is 624nm with 45° viewing angle. Product status is Active with ROHS3 Compliant certification. This substitute requires circuit design review due to 0.15V higher forward voltage but maintains similar brightness characteristics to MT7403A-UR-A.

SLI-343URC3F (Rohm Semiconductor) operates at 1.9V forward voltage with 20mA test current, providing 450mcd brightness. Lens transparency is Diffused rather than Clear, which affects light transmission characteristics. Wavelength is 620nm with 40° viewing angle. Product status is Not For New Designs. This substitute is suitable only for maintenance applications where diffused lens characteristics are acceptable.

Tier 3 - Limited Compatibility (Functional Alternatives with Significant Variations):

HLMP-Y301-F0000 (Broadcom Limited) operates at 2.1V forward voltage with 20mA test current, providing only 19mcd brightness. This represents a 97% reduction in brightness and is suitable only for low-brightness indication applications.

LTL-1CHEE (Lite-On Inc.) operates at 2V forward voltage with 20mA test current, providing 19mcd brightness. Lens size is 3.10mm diameter. This substitute is suitable only for low-brightness indication applications.

SLR-332VC3F and SLR-332VCT32 (Rohm Semiconductor) operate at 2V forward voltage with 10mA test current, providing only 10mcd brightness. Viewing angle is 85°, significantly wider than FR3863X's 40°. These substitutes are suitable only for wide-angle, low-brightness indication applications. SLR-332VCT32 is packaged in Tape & Box format versus Bulk packaging for SLR-332VC3F.

Compliance Considerations:

All substitute parts meet RoHS or ROHS3 compliance requirements. LTL-1CHEE is REACH Affected, while all other substitutes are REACH Unaffected. For new designs, select from Active product status parts: MT7403A-UR-A, HLMP-Y301-F0000, LTL-1CHEE, LTL1CHJETNN, SLR-332VC3F, or SLR-332VCT32. SLI-343URC3F is Not For New Designs and should be used only for maintenance of existing products.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace FR3863X with MT7403A-UR-A without circuit modifications?

A: Yes, MT7403A-UR-A can be used as a direct replacement without circuit modifications. Both components operate at 1.9V forward voltage with 20mA test current. However, brightness will be reduced from 640mcd to 200mcd. Verify that the application's brightness requirements are met with the lower output.

Q2: What is the primary difference between Clear and Diffused lens transparency?

A: Clear lens transparency provides direct light transmission with minimal scattering, resulting in a focused beam. Diffused lens transparency scatters light over a wider area, reducing peak brightness but improving visibility from off-axis angles. SLI-343URC3F uses Diffused transparency, while FR3863X uses Clear. These are not interchangeable for applications requiring specific light distribution patterns.

Q3: Why do some substitutes have significantly lower millicandela ratings?

A: Millicandela rating depends on LED chip design, lens optics, and test current. HLMP-Y301-F0000, LTL-1CHEE, and SLR-332 series components are designed for low-brightness indication applications. These parts are suitable only if the application requires reduced brightness or operates at lower current levels.

Q4: What does "Not For New Designs" mean for SLI-343URC3F?

A: "Not For New Designs" indicates that the manufacturer recommends against using this part in new product development. It may be used for maintenance and repair of existing products already in the field. For new designs, select from parts with Active product status.

Q5: How does forward voltage affect circuit design?

A: Forward voltage (Vf) determines the voltage drop across the LED when conducting. FR3863X operates at 1.9V, while substitutes range from 1.9V to 2.1V. Higher Vf requires higher supply voltage or different current-limiting resistor values. Verify that your circuit design accommodates the substitute's Vf specification.

Q6: What is the significance of viewing angle differences?

A: Viewing angle defines the cone of light emission. FR3863X has 40° viewing angle, while SLR-332 series has 85°. Wider viewing angles provide visibility from more off-axis positions but reduce peak brightness in the forward direction. Select based on application requirements for light distribution.

Q7: Are SLR-332VC3F and SLR-332VCT32 electrically identical?

A: Yes, SLR-332VC3F and SLR-332VCT32 are electrically identical. The difference is packaging: SLR-332VC3F is supplied in Bulk packaging, while SLR-332VCT32 is supplied in Tape & Box (TB) format. Select based on assembly process requirements.

Q8: Can I use HLMP-Y301-F0000 for high-brightness applications?

A: No. HLMP-Y301-F0000 provides only 19mcd brightness compared to FR3863X's 640mcd. This part is designed for low-brightness indication only. For high-brightness requirements, use MT7403A-UR-A or LTL1CHJETNN.

Q9: What does REACH Affected status mean for LTL-1CHEE?

A: REACH Affected indicates that the component contains substances regulated under the REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) directive. Verify compliance with your regional regulations and supply chain requirements before selecting this part.

Q10: Is the 0.2mm difference in lens size between FR3863X (3mm) and LTL-1CHEE (3.10mm) significant?

A: The 0.2mm difference is within typical manufacturing tolerances for 3mm T-1 form factor LEDs. However, verify PCB footprint compatibility and mechanical clearance in your specific application. Lens diameter affects light distribution and may impact optical performance.

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