EFY3864X Equivalent & Substitute Parts

Part Overview

The EFY3864X is a yellow 590nm LED indication component manufactured by Stanley Electric Co, designed for through-hole mounting in 3mm T-1 form factor applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The component operates at 1.9V forward voltage with 500mcd brightness rating and 70° viewing angle, suitable for indicator applications requiring high luminous intensity.

Key Parameters

Parameter	Value
Manufacturer Part Number	EFY3864X
Manufacturer	Stanley Electric Co
Product Status	Obsolete
Color	Yellow
Lens Transparency	Clear
Lens Size	3mm, T-1
Voltage - Forward (Vf) Typical	1.9V
Current - Test	20mA
Millicandela Rating	500mcd
Wavelength - Dominant	590nm
Wavelength - Peak	592nm
Viewing Angle	70°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.40mm

Substitute Part Grouping Explanation

Substitute parts for the EFY3864X are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Color: Yellow (dominant wavelength 585nm–592nm range)
Lens Transparency: Clear
Lens Size: 3mm, T-1 form factor
Mounting Type: Through Hole, Radial configuration
Package / Case: Radial

Secondary Compatibility Considerations:

Voltage - Forward (Vf): Range 1.9V–2.1V acceptable for most circuit designs
Current - Test: 10mA–20mA operational range
Millicandela Rating: 15mcd–500mcd (brightness varies by application requirement)
Viewing Angle: 45°–70° (wider angles provide broader visibility)
Product Status: Active preferred for long-term availability

Substitutes are identified where the core parameters align with the EFY3864X specifications. Parts with different colors (orange), significantly different brightness ratings, or incompatible form factors are excluded from direct substitution.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	Millicandela	Wavelength - Dominant	Viewing Angle	Height (Max)	Product Status
EFY3864X	Stanley Electric Co	Yellow	Clear	3mm, T-1	1.9V	20mA	500mcd	590nm	70°	5.40mm	Obsolete
5219431F	Dialight	Yellow	Clear	2.90mm Dia	—	20mA	30mcd	—	—	5.89mm	Active
HLMP-1420	Broadcom Limited	Yellow	Clear	3mm, T-1	2V	10mA	15mcd	585nm	45°	6.35mm	Active
HLMP-1421	Broadcom Limited	Yellow	Clear	3mm, T-1	2V	10mA	15mcd	585nm	45°	6.35mm	Active
HLMP-1421-F0002	Broadcom Limited	Yellow	Clear	3mm, T-1	2V	10mA	15mcd	585nm	45°	6.35mm	Active
LTL-4252N	Lite-On Inc.	Yellow	Clear	3mm, T-1	2.1V	10mA	19mcd	588nm	45°	5.85mm	Active
LTL1CHJSTNN	Lite-On Inc.	Yellow	Clear	3mm, T-1	2.05V	20mA	180mcd	587nm	45°	5.20mm	Active
OVLBY4C7	TT Electronics/Optek Technology	Yellow	Clear	3mm, T-1	2V	20mA	3700mcd	589nm	45°	5.35mm	Active

Engineering Selection Recommendations

For Direct Replacement with Minimal Circuit Modification:

OVLBY4C7 (TT Electronics/Optek Technology) provides the closest electrical and optical match. Operating voltage (2V) is within acceptable tolerance of the EFY3864X (1.9V), test current matches at 20mA, and wavelength (589nm) aligns with the original specification (590nm). Product status is active with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory compliance.

For Applications Tolerant of Reduced Brightness:

HLMP-1420 and HLMP-1421 (Broadcom Limited) are suitable where lower brightness (15mcd versus 500mcd) is acceptable. Both parts maintain 3mm T-1 form factor, clear lens transparency, and active product status. Forward voltage (2V) requires minimal circuit adjustment. ROHS3 compliance and unlimited MSL rating support modern manufacturing standards.

For High-Brightness Applications:

LTL1CHJSTNN (Lite-On Inc.) delivers 180mcd brightness at 2.05V forward voltage with 20mA test current, matching the original current specification. Wavelength (587nm) remains within yellow spectrum range. This part accommodates applications requiring higher luminous intensity than standard alternatives.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, aligning with current regulatory requirements. Moisture sensitivity level (MSL 1 - Unlimited) on active parts ensures compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1420 directly replace EFY3864X without circuit changes?

A: HLMP-1420 operates at 2V forward voltage compared to EFY3864X at 1.9V, a 0.1V difference within typical circuit tolerance. Test current is 10mA versus 20mA, requiring series resistor adjustment. Brightness is significantly lower (15mcd versus 500mcd), suitable only for applications where reduced luminous intensity is acceptable.

Q: What is the brightness difference between EFY3864X and OVLBY4C7?

A: OVLBY4C7 delivers 3700mcd compared to EFY3864X at 500mcd, approximately 7.4 times brighter. This higher brightness may require circuit-level current limiting adjustment to prevent over-driving the LED and ensure proper indicator function.

Q: Are all substitute parts compatible with through-hole PCB assembly?

A: Yes. All listed substitutes maintain through-hole radial mounting configuration with 3mm T-1 form factor, compatible with standard PCB assembly equipment and manual insertion processes.

Q: Which substitute offers the best long-term availability?

A: OVLBY4C7, HLMP-1420, HLMP-1421, and LTL-4252N all carry active product status with inventory levels exceeding 6,000 units, ensuring sustained availability. ROHS3 compliance and unlimited MSL rating support continued manufacturing support.

Q: Does 5219431F meet the form factor requirements?

A: 5219431F uses 2.90mm diameter lens versus the standard 3mm T-1 specification. While functionally similar, the slightly smaller lens diameter may affect mechanical fit in applications with tight component spacing or specific lens retention mechanisms.

Q: What is the wavelength range for yellow LED substitutes?

A: Acceptable yellow wavelengths for EFY3864X substitution range from 585nm to 592nm. All listed yellow substitutes fall within this range, with dominant wavelengths between 585nm (Broadcom HLMP series) and 590nm (Stanley Electric original specification).

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