Equivalent & Substitute Parts for LTL2R3QRK

Part Overview

The LTL2R3QRK is a red LED indicator from Lite-On Inc., featuring a 5mm T-1 3/4 through-hole package with 500mcd brightness and 1.9V forward voltage. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility with through-hole mounting, red wavelength specifications (624nm–639nm range), and standard lens configurations while meeting current product availability and compliance requirements.

Key Parameters

Parameter	LTL2R3QRK
Manufacturer	Lite-On Inc.
Color	Red
Lens Size	5mm, T-1 3/4
Mounting Type	Through Hole
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	500mcd
Wavelength - Dominant	631nm
Wavelength - Peak	639nm
Viewing Angle	30°
Lens Style	Round with Domed Top
Lens Transparency	Clear
Package / Case	Radial
Height (Max)	8.70mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Mounting Type: Through Hole (mandatory)
Lens Size: 5mm, T-1 3/4 or equivalent 5.00mm diameter (mandatory)
Lens Style: Round with Domed Top (mandatory)
Lens Transparency: Clear (mandatory)
Color: Red (mandatory)
Package / Case: Radial (mandatory)

Electrical Compatibility Parameters:

Voltage - Forward (Vf): 1.9V–2.1V range acceptable
Current - Test: 20mA (standard test condition)
Wavelength - Dominant: 624nm–631nm range
Wavelength - Peak: 632nm–650nm range

Mechanical Compatibility Parameters:

Height (Max): 8.70mm–10.30mm range
Viewing Angle: 6°–30° (application-dependent)
Millicandela Rating: 500mcd–7500mcd (brightness variation acceptable based on circuit design)

Compliance & Status:

Product Status: Active preferred (obsolete parts not suitable as long-term substitutes)
RoHS/REACH Compliance: Preferred for new designs

Substitute parts meeting all primary requirements and falling within electrical and mechanical parameter ranges are classified as direct equivalents.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Millicandela	Wavelength - Dominant	Viewing Angle	Height (Max)	Product Status	RoHS Status
LTL2R3QRK	Lite-On Inc.	1.9V	500mcd	631nm	30°	8.70mm	Obsolete	—
LTL2P3KRK	Lite-On Inc.	2V	800mcd	631nm	22°	8.70mm	Active	ROHS3 Compliant
383-2SDRC/S530-A4	Everlight Electronics Co Ltd	2V	2780mcd	639nm	6°	8.90mm	Active	—
383-2SURC/S530-A6	Everlight Electronics Co Ltd	2V	6300mcd	624nm	6°	8.90mm	Active	—
7343-2SURC/H2/S400-A6	Everlight Electronics Co Ltd	2V	1600mcd	624nm	30°	8.85mm	Active	ROHS3 Compliant
7343-2SURC/H2/S400-A7	Everlight Electronics Co Ltd	2V	1600mcd	624nm	30°	8.85mm	Active	ROHS3 Compliant
7343-2SURC/H2/S400-A8	Everlight Electronics Co Ltd	2V	2000mcd	624nm	30°	8.85mm	Active	ROHS3 Compliant
7343-2USRC/S1060	Everlight Electronics Co Ltd	2V	4000mcd	631nm	30°	8.85mm	Active	ROHS3 Compliant
7383/R7C3-ARUB/P/MS	Everlight Electronics Co Ltd	2V	7150mcd	624nm	30°	9.00mm	Active	ROHS3 Compliant
C503B-RCN-CW0Z0AA1	CreeLED, Inc.	2.1V	7500mcd	624nm	30°	10.30mm	Active	RoHS Compliant
HLMP-EG08-VY000	Broadcom Limited	1.9V	8100mcd	626nm	8°	8.91mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Closest Match): LTL2P3KRK from Lite-On Inc. is the manufacturer-recommended substitute. It maintains identical lens size (5mm, T-1 3/4), height (8.70mm), and wavelength (631nm dominant) while offering improved brightness (800mcd vs. 500mcd) and active product status with ROHS3 compliance. Forward voltage increases from 1.9V to 2V, requiring circuit verification for current-limiting resistor adjustment.

Secondary Substitutes (Everlight Series): The 7343-2SURC/H2/S400-A7 and 7343-2USRC/S1060 provide active alternatives with 30° viewing angle matching the original part. Both feature ROHS3 compliance and T-1 3/4 packaging. The 7343-2USRC/S1060 offers closest wavelength match (631nm) with significantly higher brightness (4000mcd). Forward voltage is 2V across all Everlight options.

High-Brightness Alternatives: For applications requiring increased brightness, 7383/R7C3-ARUB/P/MS (7150mcd) and C503B-RCN-CW0Z0AA1 (7500mcd) are available. Both maintain 30° viewing angle and clear lens configuration. C503B-RCN-CW0Z0AA1 reaches maximum height of 10.30mm and forward voltage of 2.1V; circuit compatibility must be confirmed.

Narrow-Angle Alternatives: 383-2SDRC/S530-A4 and 383-2SURC/S530-A6 feature 6° viewing angle for focused indication applications. These parts are not recommended as direct substitutes for standard 30° viewing angle designs.

Compliance Consideration: All recommended substitutes carry active product status. ROHS3-compliant options (Lite-On LTL2P3KRK, Everlight 7343 series, Broadcom HLMP-EG08-VY000) are preferred for new designs and long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LTL2P3KRK directly replace LTL2R3QRK without circuit modification? A: LTL2P3KRK is electrically compatible with forward voltage increase from 1.9V to 2V. Current-limiting resistor values must be recalculated to maintain 20mA test current. Mechanical fit is identical (5mm T-1 3/4, 8.70mm height). Functional replacement is direct; circuit adjustment is required.

Q: What is the difference between 7343-2SURC/H2/S400-A7 and 7343-2USRC/S1060? A: Both are Everlight T-1 3/4 through-hole red LEDs with 30° viewing angle and 2V forward voltage. The 7343-2USRC/S1060 offers higher brightness (4000mcd vs. 1600mcd) and wavelength match to the original part (631nm vs. 624nm). Selection depends on brightness requirements and wavelength sensitivity of the application.

Q: Are narrow-angle LEDs (6° viewing angle) suitable replacements? A: No. The original LTL2R3QRK specifies 30° viewing angle. Narrow-angle parts (383-2SDRC/S530-A4, 383-2SURC/S530-A6) are not direct substitutes and will alter circuit performance. Use only for applications specifically requiring focused indication.

Q: What is the impact of brightness variation among substitutes? A: Brightness (millicandela rating) does not affect electrical compatibility but impacts visual indication intensity. Substitutes range from 800mcd to 8100mcd. Circuit design determines acceptable brightness range. Higher brightness may require neutral density filtering if visual intensity must match the original 500mcd specification.

Q: Which substitute offers the best long-term supply assurance? A: LTL2P3KRK (Lite-On, active status, ROHS3 compliant) and 7343-2USRC/S1060 (Everlight, active status, ROHS3 compliant) both provide strong supply continuity. Everlight parts offer higher inventory levels and multiple brightness options within the same mechanical package.

Q: Can C503B-RCN-CW0Z0AA1 be used despite its 10.30mm height? A: C503B-RCN-CW0Z0AA1 exceeds the original 8.70mm height by 1.60mm. Mechanical clearance in the PCB assembly must be verified. Forward voltage is 2.1V (highest among substitutes), requiring circuit validation. Use only if mechanical space permits and electrical parameters are acceptable.

Q: What compliance certifications should be prioritized for new designs? A: ROHS3 compliance is standard for active production parts. All recommended substitutes meet this requirement. REACH compliance status varies; CreeLED C503B-RCN-CW0Z0AA1 is REACH Unaffected, while Everlight and Broadcom parts carry REACH Affected status. Verify compliance requirements with procurement and regulatory teams.

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