SSL-LX305F4ID Red Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The SSL-LX305F4ID is a red diffused T-1 through-hole LED manufactured by Lumex Opto/Components Inc., designed for discrete LED indication applications. This component features a 3mm lens with domed top, 30mcd brightness rating, and 2V forward voltage operation at 20mA test current. The part is ROHS3 compliant and carries Active product status with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, manufacturing discontinuation, or specific application parameters that allow functional interchangeability within the T-1 diffused red LED category.

Key Parameters

Parameter	SSL-LX305F4ID Value	Substitution Criticality
Color	Red	Critical
Lens Transparency	Diffused	Critical
Lens Size / Package Type	3mm T-1 / Radial	Critical
Mounting Type	Through Hole	Critical
Voltage - Forward (Vf) Typical	2V	High
Current - Test	20mA	High
Millicandela Rating	30mcd	High
Viewing Angle	60°	Medium
Wavelength - Peak	635nm	Medium
Height (Max)	5.00mm	Medium
RoHS Status	ROHS3 Compliant	High

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on parametric alignment with the SSL-LX305F4ID:

Parametric Equivalents share all critical electrical and mechanical parameters with the main part: red color, diffused lens, 3mm T-1 package, through-hole mounting, 2V or 2.1V forward voltage, 20mA test current, 30mcd brightness, 60° viewing angle, and 635nm peak wavelength. These parts differ only in packaging format (Bulk vs. Radial) or minor height variations (4.60mm to 5.25mm). Parametric equivalents are SSL-LX3044ID, SSL-LX3044LID, and SSL-LX3052ID.

Similar Parts maintain the core form factor (3mm T-1 red diffused through-hole LED) but deviate in one or more electrical parameters including forward voltage, test current, millicandela rating, or wavelength specification. These parts are suitable for applications where the specific electrical characteristics of the SSL-LX305F4ID are not mandatory constraints. Similar parts include models from Visual Communications Company (VCC) and Broadcom Limited (HLMP and K-series).

Substitution logic is determined by:

Identical color (Red) and lens transparency (Diffused)
Identical package form factor (3mm T-1 Radial, Through Hole)
Compatible forward voltage range (1.7V to 2.1V for parametric equivalents; 1.7V to 12V for similar parts)
Compatible test current (2mA to 20mA)
Compatible brightness rating (2mcd to 45mcd)
Identical or similar wavelength specification (626nm to 645nm peak)

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Height (Max)	Wavelength - Peak	Product Status	Packaging
SSL-LX305F4ID	Lumex	2V	20mA	30mcd	60°	5.00mm	635nm	Active	Radial
SSL-LX3044ID	Lumex	2V	20mA	30mcd	60°	4.60mm	635nm	Active	Bulk
SSL-LX3044LID	Lumex	2V	20mA	30mcd	60°	4.60mm	635nm	Active	Bulk
SSL-LX3052ID	Lumex	2.1V	20mA	30mcd	60°	5.25mm	635nm	Active	Bulk
4300F1LC	VCC	1.8V	2mA	1.8mcd	50°	6.35mm	635nm	Not For New Designs	Bulk
HLMP-1600	Broadcom	5V	10mA	2.1mcd	60°	6.35mm	635nm	Active	Bulk
HLMP-1601	Broadcom	12V	13mA	2.1mcd	60°	6.35mm	635nm	Active	Bulk
HLMP-1700	Broadcom	1.7V	2mA	2.1mcd	50°	6.35mm	635nm	Active	Bulk
HLMP-1700-B0002	Broadcom	1.7V	2mA	2.1mcd	50°	6.35mm	635nm	Active	Cut Tape (CT)
HLMP-K101	Broadcom	1.8V	20mA	45mcd	60°	6.35mm	645nm	Active	Bulk
HLMP-K150	Broadcom	1.7V	1mA	2mcd	60°	6.35mm	660nm	Active	Bulk

Engineering Selection Recommendations

Parametric Equivalent Selection (Preferred for Direct Substitution)

SSL-LX3044ID and SSL-LX3044LID are parametric equivalents of SSL-LX305F4ID with identical electrical specifications (2V Vf, 20mA test current, 30mcd). Both parts are ROHS3 compliant and carry Active product status. The primary difference is packaging format (Bulk vs. Radial) and minor height reduction (4.60mm vs. 5.00mm). These parts are suitable for applications where the SSL-LX305F4ID is specified and inventory availability is the primary concern.

SSL-LX3052ID is a parametric equivalent with marginally higher forward voltage (2.1V vs. 2V) and increased height (5.25mm vs. 5.00mm). This part maintains identical brightness (30mcd), test current (20mA), and viewing angle (60°). Selection of SSL-LX3052ID is appropriate when circuit design accommodates the 0.1V voltage differential and the additional 0.25mm height does not create mechanical constraints.

Similar Part Selection (Application-Dependent)

HLMP-K101 (Broadcom) matches the SSL-LX305F4ID in forward voltage (1.8V typical), test current (20mA), and viewing angle (60°). This part offers higher brightness (45mcd vs. 30mcd) and is suitable for applications requiring increased luminous intensity. Peak wavelength differs slightly (645nm vs. 635nm), which may affect color perception in critical applications.

HLMP-1700 and HLMP-1700-B0002 (Broadcom) operate at lower forward voltage (1.7V) and test current (2mA), making them suitable for low-power indication circuits. These parts are not recommended as direct substitutes for the SSL-LX305F4ID in applications requiring 20mA operation and 30mcd brightness.

HLMP-1600 and HLMP-1601 (Broadcom) operate at higher forward voltages (5V and 12V respectively) and are suitable only for applications with corresponding supply voltage requirements.

4300F1LC (VCC) carries "Not For New Designs" product status and is not recommended for new applications despite parametric similarity in wavelength.

All recommended substitute parts maintain ROHS3 compliance and MSL 1 rating consistent with the SSL-LX305F4ID.

Frequently Asked Questions (FAQ)

Q: Can SSL-LX3044ID directly replace SSL-LX305F4ID in existing designs?

A: Yes. SSL-LX3044ID is a parametric equivalent with identical electrical specifications (2V Vf, 20mA test current, 30mcd brightness). The primary difference is packaging format (Bulk vs. Radial) and a 0.4mm height reduction (4.60mm vs. 5.00mm). If the PCB layout accommodates the reduced height, direct substitution is valid.

Q: What is the difference between SSL-LX3052ID and SSL-LX305F4ID?

A: SSL-LX3052ID differs in forward voltage (2.1V vs. 2V) and height (5.25mm vs. 5.00mm). Both parts share identical brightness (30mcd), test current (20mA), and viewing angle (60°). The 0.1V voltage increase requires circuit verification to ensure the design accommodates the higher forward voltage drop.

Q: Why is 4300F1LC marked "Not For New Designs"?

A: VCC has discontinued this part for new applications. Although parametric data is available, Broadcom and Lumex alternatives with Active status are preferred for new designs to ensure long-term supply availability and manufacturer support.

Q: Can HLMP-K101 replace SSL-LX305F4ID?

A: HLMP-K101 is a similar part, not a parametric equivalent. It offers higher brightness (45mcd vs. 30mcd) and operates at 1.8V forward voltage. Substitution is valid only if the application circuit is designed to accommodate the higher luminous intensity and the 0.2V voltage difference does not create circuit compatibility issues.

Q: What is the significance of the 60° viewing angle specification?

A: The 60° viewing angle indicates the half-angle at which luminous intensity drops to 50% of the peak value. SSL-LX305F4ID and most Lumex parametric equivalents maintain 60° viewing angle. Some Broadcom alternatives (HLMP-1700 series) specify 50° viewing angle, which results in a narrower light distribution cone. This parameter is critical for applications requiring specific light distribution patterns.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with SSL-LX305F4ID environmental and regulatory requirements.

Q: What packaging formats are available?

A: SSL-LX305F4ID is supplied in Radial packaging. Parametric equivalents (SSL-LX3044ID, SSL-LX3044LID, SSL-LX3052ID) are available in Bulk packaging. HLMP-1700-B0002 is available in Cut Tape (CT) format. Packaging selection depends on assembly process requirements and volume considerations.

Q: Can I use HLMP-1700 in a 20mA circuit designed for SSL-LX305F4ID?

A: No. HLMP-1700 is rated for 2mA test current, not 20mA. Operating this part at 20mA exceeds its design specification and will result in excessive brightness, reduced lifespan, and potential component failure. Use only in circuits designed for 2mA operation.

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