EFA3864X Orange LED 3MM Round Through-Hole Equivalent & Substitute Parts

Part Overview

The EFA3864X is an orange 605nm 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 560mcd brightness rating and features a 3mm round domed lens with 70° viewing angle. The product is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	EFA3864X
Manufacturer	Stanley Electric Co
Color	Orange
Wavelength - Dominant	605nm
Wavelength - Peak	609nm
Voltage - Forward (Vf) Typical	1.9V
Current - Test	20mA
Millicandela Rating	560mcd
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Viewing Angle	70°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.40mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the EFA3864X is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Orange (605nm dominant wavelength range)
Mounting Type: Through Hole Radial configuration
Lens Size: 3mm T-1 form factor
Voltage - Forward (Vf): 1.9V to 2.1V operating range
Current - Test: 10mA to 20mA
Package / Case: Radial through-hole

Substitute parts are grouped into two categories:

Direct Orange LED Substitutes (605nm wavelength): Parts maintaining orange color specification with compatible electrical characteristics and through-hole mounting.
Alternative Color Substitutes (Yellow wavelength): Parts with different color output but compatible electrical parameters, lens size, and mounting configuration. These are suitable only where color specification permits substitution.

Parts with significantly different lens sizes (5mm T-1 3/4), substantially lower brightness ratings, or incompatible voltage requirements are listed but require design review before implementation.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Vf (V)	Test Current (mA)	Brightness (mcd)	Lens Size	Viewing Angle (°)	Height Max (mm)	Product Status
EFA3864X	Stanley Electric Co	Orange	605/609	1.9	20	560	3mm T-1	70	5.40	Obsolete
HLMP-Y402-G0000	Broadcom Limited	Orange	605/610	2.1	20	29	3mm T-1	45	5.20	Active
SLI-560DT3F	Rohm Semiconductor	Orange	611	1.9	20	1000	5mm T-1 3/4	40	7.70	Not For New Designs
SLR-332DC3F	Rohm Semiconductor	Orange	605	2.0	10	16	3.20mm	85	4.60	Active
SLR-332DCT32	Rohm Semiconductor	Orange	610	2.0	10	16	3.20mm	75	4.60	Active
5219431F	Dialight	Yellow	—	—	20	30	2.90mm	—	5.89	Active
HLMP-1420	Broadcom Limited	Yellow	585/583	2.0	10	15	3mm T-1	45	6.35	Active
HLMP-1421	Broadcom Limited	Yellow	585/583	2.0	10	15	3mm T-1	45	6.35	Active
LTL-4252N	Lite-On Inc.	Yellow	588/585	2.1	10	19	3mm T-1	45	5.85	Active
LTL1CHJSTNN	Lite-On Inc.	Yellow	587/588	2.05	20	180	3mm T-1	45	5.20	Active
SLR-332YC3F	Rohm Semiconductor	Yellow	587	2.1	10	10	3.20mm	85	4.60	Active

Engineering Selection Recommendations

Recommended Orange LED Substitutes (Direct Color Match):

HLMP-Y402-G0000 (Broadcom Limited) is the primary active substitute for the EFA3864X. It maintains orange color specification at 605nm dominant wavelength, operates within compatible voltage range (2.1V vs 1.9V original), supports 20mA test current, and features identical 3mm T-1 lens size. Product status is active with ROHS3 compliance. Brightness is significantly reduced (29mcd vs 560mcd), requiring circuit design verification for brightness-critical applications.

SLR-332DC3F and SLR-332DCT32 (Rohm Semiconductor, SLR-332 series) provide orange LED alternatives with active product status and ROHS3 compliance. Both operate at 2.0V forward voltage with 10mA test current. Lens size is 3.20mm (slightly smaller than original 3mm T-1), and brightness is substantially lower (16mcd). These parts are suitable for applications where reduced brightness is acceptable and mechanical fit permits the smaller lens diameter.

SLI-560DT3F (Rohm Semiconductor) offers orange color at 611nm with matching 1.9V forward voltage and 20mA test current. However, this part uses 5mm T-1 3/4 lens size (larger than original 3mm), resulting in increased height (7.70mm vs 5.40mm). Product status is "Not For New Designs," limiting suitability for new applications. Brightness is significantly higher (1000mcd), suitable only for applications requiring increased luminous intensity with mechanical accommodation for larger form factor.

Alternative Yellow LED Substitutes (Color Substitution Required):

LTL1CHJSTNN (Lite-On Inc.) provides the closest electrical match among yellow alternatives, operating at 2.05V forward voltage with 20mA test current and 3mm T-1 lens size. Brightness rating of 180mcd is lower than the original 560mcd. Product status is active with ROHS3 compliance. This part is suitable only where application design permits yellow color substitution.

HLMP-1420 and HLMP-1421 (Broadcom Limited) are identical yellow LED specifications operating at 2.0V with 10mA test current and 3mm T-1 lens size. Both are active products with ROHS3 compliance. Brightness is significantly reduced (15mcd). Height is increased to 6.35mm compared to original 5.40mm.

LTL-4252N (Lite-On Inc.) operates at 2.1V with 10mA test current and 3mm T-1 lens size. Brightness is 19mcd. Product status is active with ROHS3 compliance and REACH affected status.

5219431F (Dialight, Series 521) is a yellow LED with 20mA test current and active product status. Lens size is 2.90mm (smaller than original), and forward voltage is not specified. This part requires additional electrical characterization before implementation.

SLR-332YC3F (Rohm Semiconductor, SLR-332 series) is a yellow LED operating at 2.1V with 10mA test current. Lens size is 3.20mm, and brightness is 10mcd. Product status is active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the EFA3864X be directly replaced with HLMP-Y402-G0000?

A: HLMP-Y402-G0000 maintains orange color specification and through-hole radial mounting compatible with EFA3864X. Both operate at similar forward voltages (2.1V vs 1.9V) and support 20mA test current. However, brightness is substantially reduced (29mcd vs 560mcd). Direct replacement is feasible only if circuit design accommodates lower brightness output. Verify LED current-limiting resistor values for the higher forward voltage.

Q: What is the primary limitation of SLI-560DT3F as a substitute?

A: SLI-560DT3F uses a 5mm T-1 3/4 lens form factor compared to the original 3mm T-1 size, resulting in increased component height (7.70mm vs 5.40mm). This larger form factor may not fit existing PCB layouts or mechanical enclosures designed for 3mm LEDs. Additionally, product status is "Not For New Designs," limiting its use in new applications. The part is suitable only for legacy system maintenance where mechanical space permits the larger size.

Q: Are yellow LED substitutes compatible with the EFA3864X application?

A: Yellow LED substitutes are compatible only if the application design permits color substitution. The EFA3864X is specified for orange indication at 605nm. Yellow alternatives (585nm to 588nm wavelength) produce visually distinct color output. Substitution requires confirmation that the end application does not depend on specific orange color for functional or regulatory compliance purposes. Electrical parameters (voltage, current, mounting type) are compatible across yellow alternatives listed.

Q: Which substitute offers the closest brightness match to the original EFA3864X?

A: LTL1CHJSTNN (Lite-On Inc.) provides the highest brightness among listed substitutes at 180mcd, though still significantly lower than the original 560mcd. This part operates at 2.05V forward voltage with 20mA test current and 3mm T-1 lens size, matching the original form factor. However, this part is yellow rather than orange. Among orange-only substitutes, HLMP-Y402-G0000 is the only active product, with 29mcd brightness. For applications requiring brightness levels approaching the original 560mcd, SLI-560DT3F offers 1000mcd but requires accommodation of the larger 5mm T-1 3/4 form factor.

Q: What compliance certifications apply to substitute parts?

A: All listed substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the original EFA3864X compliance profile. LTL-4252N is the only exception, with REACH Affected status. All parts are classified under ECCN EAR99 and HTSUS 8541.41.0000. Moisture Sensitivity Level (MSL) for active substitutes is rated 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Can SLR-332 series parts (SLR-332DC3F, SLR-332DCT32, SLR-332YC3F) be used interchangeably?

A: SLR-332DC3F and SLR-332DCT32 are orange LED variants with identical electrical specifications (2.0V, 10mA, 16mcd) and form factor (3.20mm lens, 4.60mm height). These two parts differ only in viewing angle (85° vs 75°) and packaging (Bulk vs Tape & Box). SLR-332YC3F is a yellow variant of the same series with identical electrical and mechanical specifications except for color. All three SLR-332 parts feature smaller lens diameter (3.20mm vs 3mm original) and reduced height (4.60mm vs 5.40mm original), requiring PCB layout verification before substitution.

Q: What forward voltage adjustment is required when substituting the EFA3864X?

A: The original EFA3864X operates at 1.9V forward voltage. Most active substitutes operate at 2.0V to 2.1V forward voltage. This 0.1V to 0.2V increase requires recalculation of LED current-limiting resistor values to maintain proper brightness and component lifespan. Use the formula: R = (Vsupply - Vf) / Iled, where Vf is the new forward voltage and Iled is the desired LED current (typically 10mA to 20mA based on substitute part specifications). Failure to adjust resistor values may result in excessive current and premature LED failure.

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