SSL-LX305F4YD Yellow LED T-1 Equivalent & Substitute Parts

Part Overview

The SSL-LX305F4YD is an active yellow diffused LED manufactured by Lumex Opto/Components Inc., designed for through-hole mounting in indication applications. This T-1 (3mm) radial LED operates at 2.1V forward voltage with a 30mcd brightness rating and 60° viewing angle. The component is ROHS3 compliant and REACH unaffected, with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements permit variation in specific electrical or mechanical parameters while maintaining functional compatibility in yellow LED indication circuits. Equivalent parts share identical critical specifications, while similar parts accommodate applications with relaxed brightness, voltage, or viewing angle requirements.

Key Parameters

Parameter	SSL-LX305F4YD Value	Substitution Relevance
Color	Yellow	Critical - determines wavelength compatibility
Lens Transparency	Diffused	Critical - affects light distribution
Lens Size / Package	3mm T-1 Radial	Critical - determines mechanical fit
Voltage - Forward (Vf)	2.1V	Critical - circuit design parameter
Current - Test	20mA	Important - brightness and power consumption
Millicandela Rating	30mcd	Important - brightness level
Viewing Angle	60°	Important - visibility range
Wavelength - Peak	585nm	Important - color specification
Mounting Type	Through Hole	Critical - assembly compatibility
Height (Max)	5.00mm	Important - PCB clearance
RoHS Status	ROHS3 Compliant	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitution logic for the SSL-LX305F4YD is based on the following allowed parameter variations:

Parametric Equivalents share all critical specifications: yellow color, diffused lens, 3mm T-1 package, 2.1V forward voltage, 20mA test current, 60° viewing angle, 585nm peak wavelength, through-hole mounting, and ROHS3 compliance. Only packaging format (bulk vs. tape) and minor height variations (±0.65mm) are permitted.

Similar Substitutes accommodate applications where one or more of the following parameters may differ from the main part:

Forward voltage (1.8V to 12V acceptable for different circuit designs)
Test current (2mA to 13mA acceptable for different brightness requirements)
Millicandela rating (2.1mcd to 8.7mcd acceptable for relaxed brightness specifications)
Viewing angle (40° to 60° acceptable for different visibility requirements)
Height variation (up to 8.60mm acceptable for different PCB layouts)
Lens size (T-1 3/4 at 5.00mm diameter acceptable for similar form factor)
Wavelength peak (583nm to 588nm acceptable within yellow spectrum)

Non-Substitutable Parameters (no variation allowed):

Color (yellow only)
Lens transparency (diffused only)
Mounting type (through-hole only)
Base package style (radial only)
Regulatory compliance (ROHS3 required)

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current (mA)	mcd	Viewing Angle	Peak λ (nm)	Height Max (mm)	Lens Size	Packaging	Inventory
SSL-LX305F4YD	Lumex	Yellow	2.1V	20	30	60°	585	5.00	3mm T-1	Radial	1,150
SSL-LX3044LYD	Lumex	Yellow	2.1V	20	30	60°	585	4.60	3mm T-1	Bulk	13,200
SSL-LX3054YD	Lumex	Yellow	2.1V	20	30	60°	585	5.25	3mm T-1	Bulk	3,027
HLMP-1620	Broadcom	Yellow	5V	10	2.2	60°	583	6.35	3mm T-1	Bulk	12,068
HLMP-1621	Broadcom	Yellow	12V	13	2.2	60°	583	6.35	3mm T-1	Bulk	16,474
HLMP-1719	Broadcom	Yellow	1.8V	2	2.1	50°	585	6.35	3mm T-1	Bulk	21,200
HLMP-1719-A0002	Broadcom	Yellow	1.8V	2	2.1	50°	585	6.35	3mm T-1	Cut Tape	4,673
LTL-307YLC	Lite-On	Yellow	1.8V	2	3.7	50°	585	8.60	5mm T-1 3/4	Bulk	4,336
LTL-4251	Lite-On	Yellow	2.1V	10	8.7	40°	585	6.55	3mm T-1	Bulk	7,627
LTL-4251N	Lite-On	Yellow	2.1V	10	5.6	60°	585	5.85	3mm T-1	Bulk	32,761
SLI-343D8C3F	Rohm	Orange	2.2V	20	680	40°	605	5.60	3.10mm T-1	Bulk	25,344

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitution)

SSL-LX3044LYD and SSL-LX3054YD are parametric equivalents of SSL-LX305F4YD. Both parts maintain identical electrical specifications (2.1V, 20mA, 30mcd, 60° viewing angle, 585nm peak wavelength) and mechanical compatibility (3mm T-1 through-hole radial package). Height variation is within acceptable tolerance (4.60mm to 5.25mm vs. 5.00mm nominal). Both are ROHS3 compliant with unlimited MSL rating. SSL-LX3044LYD offers significantly higher inventory (13,200 units) compared to the main part (1,150 units).

Similar Substitutes (Application-Dependent Selection)

LTL-4251N (Lite-On) provides the closest alternative among similar parts, maintaining 2.1V forward voltage, 3mm T-1 package, 60° viewing angle, and 585nm wavelength. The 5.6mcd brightness and 10mA test current represent acceptable variations for applications where reduced brightness is acceptable. Height (5.85mm) and inventory (32,761 units) are favorable. ROHS3 compliance and unlimited MSL are confirmed.

HLMP-1719 and HLMP-1719-A0002 (Broadcom) are suitable for low-power applications requiring 1.8V operation and minimal current draw (2mA). These parts sacrifice brightness (2.1mcd) and viewing angle (50°) but maintain 585nm wavelength and 3mm T-1 package. Broadcom's high inventory (21,200 units bulk, 4,673 units cut tape) supports supply chain flexibility.

LTL-4251 (Lite-On) accommodates applications where reduced viewing angle (40°) is acceptable. At 8.7mcd brightness with 2.1V operation, this part provides enhanced brightness for focused indication applications. REACH status is affected; verify regulatory requirements before selection.

Non-Recommended Substitutes

HLMP-1620 and HLMP-1621 (Broadcom) require 5V and 12V operation respectively, incompatible with 2.1V circuit designs. Brightness reduction (2.2mcd) and height increase (6.35mm) further limit applicability.

LTL-307YLC (Lite-On) uses T-1 3/4 package (5mm diameter) with 8.60mm height, exceeding mechanical compatibility for standard 3mm T-1 PCB layouts.

SLI-343D8C3F (Rohm) is orange (605nm), not yellow, and therefore not substitutable for yellow indication applications.

Frequently Asked Questions (FAQ)

Q: Can SSL-LX3044LYD directly replace SSL-LX305F4YD without circuit modification?

A: Yes. SSL-LX3044LYD is a parametric equivalent with identical electrical specifications (2.1V, 20mA, 30mcd) and mechanical compatibility (3mm T-1 radial through-hole). Height difference (4.60mm vs. 5.00mm) is within acceptable PCB clearance tolerance. No circuit redesign is required.

Q: What is the primary difference between parametric equivalents and similar substitutes?

A: Parametric equivalents maintain all critical specifications of the main part, differing only in packaging format or minor dimensional tolerance. Similar substitutes accommodate applications where one or more electrical parameters (voltage, current, brightness, viewing angle) may differ from the original design specification.

Q: Can LTL-4251N replace SSL-LX305F4YD in a 2.1V circuit?

A: Yes, with brightness consideration. LTL-4251N operates at 2.1V with identical test current (10mA vs. 20mA in the main part) and maintains 60° viewing angle and 585nm wavelength. Brightness is reduced (5.6mcd vs. 30mcd). Substitution is valid for applications where lower brightness is acceptable.

Q: Why is SLI-343D8C3F listed if it cannot substitute?

A: SLI-343D8C3F is included in the provided substitute list but is not functionally substitutable. The part is orange (605nm), not yellow, and therefore incompatible with yellow indication applications. This demonstrates the importance of verifying color specification before component selection.

Q: What packaging options are available for equivalent parts?

A: SSL-LX3044LYD and SSL-LX3054YD are supplied in bulk packaging. The main part SSL-LX305F4YD uses radial packaging. For automated assembly, HLMP-1719-A0002 is available in cut tape (CT) format. Packaging selection depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All listed parts except SLI-343D8C3F are ROHS3 compliant. LTL-4251 has affected REACH status; verify regulatory requirements for your application. All other parts are REACH unaffected with unlimited MSL rating.

Q: What is the maximum height variation acceptable for PCB layout compatibility?

A: The main part specifies 5.00mm maximum height. Parametric equivalents range from 4.60mm to 5.25mm, all acceptable for standard T-1 through-hole layouts. Similar substitutes extend to 8.60mm (LTL-307YLC), which may require PCB redesign for clearance verification.

Q: Can HLMP-1719 be used in a 2.1V circuit designed for SSL-LX305F4YD?

A: No. HLMP-1719 requires 1.8V operation with 2mA test current, fundamentally different from the 2.1V, 20mA design. Circuit redesign including current-limiting resistor modification would be required. This part is suitable only for new designs with 1.8V power availability.

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