LTL-4256N Equivalent & Substitute Parts

Part Overview

The LTL-4256N is a yellow 588nm LED indication component manufactured by Lite-On Inc., configured as a through-hole radial T-1 package. This part is actively produced and widely used in indication applications requiring yellow light emission at 40mcd brightness. Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit alternative electrical or optical characteristics within acceptable tolerances.

Key Parameters

Parameter	LTL-4256N
Manufacturer	Lite-On Inc.
Color	Yellow
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Voltage - Forward (Vf) Typical	2.1V
Current - Test	10mA
Millicandela Rating	40mcd
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Lens Transparency	Clear
Viewing Angle	45°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.85mm
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-4256N is determined by the following critical parameters:

Primary Substitution Criteria:

Color: Yellow (dominant requirement)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: Radial (form factor compatibility)
Lens Size: 3mm or 3.10mm diameter (physical fit tolerance)
Voltage - Forward (Vf): 2.0V to 2.1V (circuit compatibility)
Wavelength - Dominant: 585nm to 590nm (visual appearance consistency)

Secondary Considerations:

Millicandela Rating: 15mcd to 110mcd (brightness variation acceptable within application context)
Viewing Angle: 24° to 60° (application-dependent)
Current - Test: 10mA to 20mA (design margin dependent)
Product Status: Active or Not For New Designs (inventory and lifecycle considerations)

Parts that deviate significantly from these parameters—such as orange-colored LEDs (605nm wavelength) or surface-mount packages—are listed for reference but do not qualify as direct substitutes for standard yellow indication applications.

Parameter Comparison

Parameter	LTL-4256N	151031YS06000	HLMP-1420	HLMP-1440
Manufacturer	Lite-On Inc.	Würth Elektronik	Broadcom Limited	Broadcom Limited
Color	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant	588nm	590nm	585nm	585nm
Wavelength - Peak	585nm	592nm	583nm	583nm
Voltage - Forward (Vf) Typical	2.1V	2.0V	2.0V	2.1V
Current - Test	10mA	20mA	10mA	20mA
Millicandela Rating	40mcd	110mcd	15mcd	45mcd
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Size	3mm, T-1	3.00mm Dia	3mm, T-1	3mm, T-1
Lens Transparency	Clear	Diffused	Clear	Clear
Viewing Angle	45°	60°	45°	24°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial
Height (Max)	5.85mm	5.55mm	6.35mm	6.35mm
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HLMP-1440 (Broadcom Limited) is the primary substitute for LTL-4256N. Both parts share identical forward voltage (2.1V), wavelength characteristics (585nm peak), and package specifications (T-1 radial). HLMP-1440 offers slightly higher brightness (45mcd vs. 40mcd) and narrower viewing angle (24° vs. 45°), making it suitable for applications where increased intensity or directional focus is acceptable. Both parts are Active status and ROHS3 compliant.

HLMP-1420 (Broadcom Limited) qualifies as a secondary substitute when lower brightness is acceptable. This part operates at 2.0V forward voltage and delivers 15mcd, approximately 37.5% of the LTL-4256N output. Identical wavelength (585nm peak) and package configuration ensure mechanical and optical compatibility. Suitable for applications with reduced brightness requirements or where power consumption must be minimized.

151031YS06000 (Würth Elektronik) is a viable substitute for applications tolerating diffused lens transparency and higher brightness. This part operates at 2.0V with 110mcd output and features a diffused lens, which distributes light over a wider viewing angle (60°). The wavelength (590nm dominant) remains within acceptable yellow spectrum range. Recommended where broader light distribution is beneficial.

SLR-343YC3F (Rohm Semiconductor) provides compatibility for yellow indication applications but carries "Not For New Designs" status. This part matches forward voltage (2.1V) and wavelength characteristics (585nm peak) but is not recommended for new product development due to lifecycle constraints.

Parts HLMP-Y901-J0000 and SLR-342DC3F are orange-colored LEDs (605nm wavelength) and do not qualify as direct substitutes for yellow indication applications requiring 588nm to 590nm wavelength.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1440 replace LTL-4256N in my circuit without modification?

A: Yes, HLMP-1440 is a direct substitute. Both parts share identical forward voltage (2.1V), wavelength (585nm peak), and T-1 radial package configuration. The primary difference is brightness (45mcd vs. 40mcd) and viewing angle (24° vs. 45°). No circuit modifications are required, though the narrower viewing angle may affect visibility in wide-angle applications.

Q: What is the difference between clear and diffused lens transparency?

A: Clear lenses transmit light with minimal scattering, producing a focused bright spot. Diffused lenses scatter light across a broader area, reducing peak intensity but improving visibility from wider angles. The 151031YS06000 diffused lens provides 60° viewing angle compared to 45° for clear lenses, at the cost of reduced peak brightness concentration.

Q: Why is HLMP-1420 listed as a substitute if it provides only 15mcd brightness?

A: HLMP-1420 qualifies as a substitute based on matching color, wavelength, package, and mounting type. It is suitable for applications where brightness requirements are lower or where power consumption must be minimized. Selection depends on specific application brightness thresholds.

Q: Are parts marked "Not For New Designs" usable in production?

A: Parts with "Not For New Designs" status (such as SLR-343YC3F) are available from inventory but are not recommended for new product development. These parts may have limited future availability or extended lead times. For new designs, prioritize Active status parts: HLMP-1440, HLMP-1420, or 151031YS06000.

Q: Can I use orange LEDs (HLMP-Y901-J0000 or SLR-342DC3F) as substitutes?

A: No. Orange LEDs operate at 605nm wavelength, which is visually distinct from yellow (588nm to 590nm). These parts do not qualify as substitutes for yellow indication applications and would produce incorrect color appearance.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts are ROHS3 compliant and carry EAR99 ECCN classification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: How do I select between multiple yellow substitutes?

A: Selection criteria depend on application requirements: (1) For maximum brightness with narrow focus, choose HLMP-1440 (45mcd, 24° angle); (2) For lower power consumption, choose HLMP-1420 (15mcd, 10mA test current); (3) For wide-angle distribution, choose 151031YS06000 (110mcd, 60° angle, diffused lens).

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