LTL2R3QFK Orange LED T-1 3/4 Through-Hole Equivalent & Substitute Parts

Part Overview

The LTL2R3QFK is an orange 605nm LED indicator manufactured by Lite-On Inc., designed for through-hole mounting in T-1 3/4 (5mm) form factor applications. This part operates at 2V forward voltage with 700mcd brightness and 30° viewing angle. The LTL2R3QFK is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications requiring orange LED indication at comparable electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTL2R3QFK
Manufacturer	Lite-On Inc.
Color	Orange
Wavelength - Dominant	605nm
Wavelength - Peak	611nm
Voltage - Forward (Vf) (Typ)	2V
Current - Test	20mA
Millicandela Rating	700mcd
Viewing Angle	30°
Lens Size	5mm, T-1 3/4
Lens Style	Round with Domed Top
Lens Transparency	Clear
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	8.70mm
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LTL2R3QFK is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria (Must Match):

Color: Orange
Wavelength - Dominant: 605nm
Wavelength - Peak: 611nm
Lens Size: 5mm, T-1 3/4
Mounting Type: Through Hole
Lens Style: Round with Domed Top
Lens Transparency: Clear
Package / Case: Radial

Secondary Compatibility Parameters (Allowable Variance):

Voltage - Forward (Vf): 1.98V to 2.05V (within typical LED forward voltage tolerance)
Current - Test: 20mA (standard test condition)
Millicandela Rating: 700mcd to 1290mcd (brightness variation acceptable for indication applications)
Viewing Angle: 30° (standard for this form factor)
Height (Max): 8.70mm to 8.91mm (mechanical fit tolerance)

Parametric Equivalent Parts (LTL2R3KFK, LTL2R3KFKS) share identical base product number (LTL2R3) and meet all primary and secondary criteria with only minor forward voltage variation (2.05V vs 2V).

Manufacturer Recommended Alternatives (Broadcom HLMP-EJ30 series) provide orange 605nm LEDs in T-1 3/4 form factor with compatible electrical characteristics and active product status, though with higher brightness ratings (1290mcd).

Cross-Manufacturer Alternatives are not included in this reference as they do not meet the specified wavelength and color parameters for direct substitution.

Parameter Comparison

Parameter	LTL2R3QFK (Main)	LTL2R3KFK	LTL2R3KFKS	HLMP-EJ30-NR000	HLMP-EJ30-NR0DD	HLMP-EJ08-WZ000
Manufacturer	Lite-On Inc.	Lite-On Inc.	Lite-On Inc.	Broadcom Limited	Broadcom Limited	Broadcom Limited
Color	Orange	Orange	Orange	Orange	Orange	Orange
Wavelength - Dominant	605nm	605nm	605nm	605nm	605nm	605nm
Wavelength - Peak	611nm	611nm	611nm	609nm	609nm	609nm
Voltage - Forward (Vf) (Typ)	2V	2.05V	2.05V	1.98V	1.98V	1.98V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA
Millicandela Rating	700mcd	700mcd	700mcd	1290mcd	1290mcd	10750mcd
Viewing Angle	30°	30°	30°	30°	30°	8°
Lens Size	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial
Height (Max)	8.70mm	8.70mm	8.70mm	8.91mm	8.91mm	8.91mm
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2A (4 Weeks)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Parametric Equivalence: LTL2R3KFK and LTL2R3KFKS are parametric equivalents manufactured by Lite-On Inc. under the same base product number (LTL2R3). Both parts maintain 700mcd brightness and 30° viewing angle identical to the LTL2R3QFK. LTL2R3KFK is recommended as the primary substitute due to active product status and unlimited moisture sensitivity rating. LTL2R3KFKS offers identical electrical performance but carries MSL 2A (4 weeks) moisture sensitivity, requiring controlled storage conditions.

For Active Product Status with Brightness Consideration: HLMP-EJ30-NR000 and HLMP-EJ30-NR0DD (Broadcom Limited) provide active product status with ROHS3 compliance. These parts maintain 605nm dominant wavelength, 30° viewing angle, and T-1 3/4 form factor. Brightness is rated at 1290mcd, approximately 84% higher than the LTL2R3QFK. Forward voltage is 1.98V, within acceptable tolerance. HLMP-EJ30-NR0DD is available in Cut Tape packaging with 19,741 units in stock, providing superior supply availability.

For High-Brightness Applications: HLMP-EJ08-WZ000 (Broadcom Limited) delivers 10,750mcd brightness with 605nm wavelength and active product status. This part is suitable only for applications where increased brightness is acceptable or required. Viewing angle is narrowed to 8° compared to the 30° specification of the LTL2R3QFK, restricting its use to applications with fixed viewing geometry.

Compliance Consideration: The LTL2R3QFK is RoHS non-compliant. All recommended substitutes (LTL2R3KFK, LTL2R3KFKS, HLMP series) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can LTL2R3KFK directly replace LTL2R3QFK in existing designs? A: Yes. LTL2R3KFK is a parametric equivalent with identical brightness (700mcd), viewing angle (30°), and mechanical dimensions. Forward voltage differs by 0.05V (2.05V vs 2V), which is within standard LED tolerance and does not require circuit redesign. Both parts use identical T-1 3/4 radial packaging.

Q: What is the difference between LTL2R3KFK and LTL2R3KFKS? A: Both are parametric equivalents with identical electrical specifications. The primary difference is moisture sensitivity: LTL2R3KFK has MSL 1 (unlimited storage), while LTL2R3KFKS has MSL 2A (4-week storage limit). For applications with standard storage conditions, LTL2R3KFK is preferred.

Q: Why do Broadcom HLMP-EJ30 parts have higher brightness (1290mcd) than the original? A: HLMP-EJ30-NR000 and HLMP-EJ30-NR0DD are manufacturer-recommended alternatives that maintain wavelength, form factor, and viewing angle compatibility. The increased brightness is a characteristic of Broadcom's LED design. Applications tolerant of higher brightness can use these parts without modification. Applications requiring exact brightness matching should use Lite-On LTL2R3KFK.

Q: Is HLMP-EJ08-WZ000 suitable as a substitute? A: HLMP-EJ08-WZ000 maintains wavelength and form factor but has a narrowed viewing angle of 8° versus the 30° specification. This part is suitable only for applications where the narrower viewing angle is acceptable or where increased brightness (10,750mcd) is required.

Q: What packaging options are available for substitutes? A: LTL2R3KFK is available in Bulk packaging. LTL2R3KFKS packaging is not specified. HLMP-EJ30-NR000 is available in Bulk. HLMP-EJ30-NR0DD is available in Cut Tape (CT) with the highest inventory (19,741 units). HLMP-EJ08-WZ000 is available in Bulk.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitutes (LTL2R3KFK, LTL2R3KFKS, and all Broadcom HLMP parts) are ROHS3 compliant. The original LTL2R3QFK is RoHS non-compliant, making substitution necessary for designs requiring regulatory compliance.

Q: Can I use yellow LED alternatives instead of orange? A: No. Yellow LEDs (589nm wavelength) are not direct substitutes for orange LEDs (605nm wavelength). Color and wavelength are primary substitution criteria. Yellow alternatives are listed in the original substitute field but do not meet the orange color requirement for this application.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message