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LTL2R3SRKNE Equivalent & Substitute Parts
Part Overview
The LTL2R3SRKNE is a red LED indication component manufactured by Lite-On Inc., configured as a T-1 3/4 through-hole radial package with 3200mcd brightness rating. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The component operates at 2.2V forward voltage with a 630nm dominant wavelength and 30° viewing angle, designed for standard indication applications requiring discrete red LED functionality.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LTL2R3SRKNE |
| Manufacturer | Lite-On Inc. |
| Color | Red |
| Lens Transparency | Clear |
| Millicandela Rating | 3200mcd |
| Lens Style | Round with Domed Top |
| Lens Size | 5mm, T-1 3/4 |
| Voltage - Forward (Vf) (Typ) | 2.2V |
| Current - Test | 20mA |
| Viewing Angle | 30° |
| Mounting Type | Through Hole |
| Wavelength - Dominant | 630nm |
| Wavelength - Peak | 639nm |
| Package / Case | Radial |
| Height (Max) | 8.70mm |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the LTL2R3SRKNE is determined by the following critical parameters:
Primary Compatibility Criteria:
- Color: Red
- Lens Transparency: Clear
- Mounting Type: Through Hole
- Package / Case: Radial
- Lens Style: Round with Domed Top
Electrical Compatibility Range:
- Voltage - Forward (Vf): 1.9V to 2.2V (acceptable tolerance for series circuit applications)
- Current - Test: 20mA (standard test condition)
- Wavelength - Dominant: 620nm to 640nm (red spectrum range)
Mechanical Compatibility:
- Lens Size: 5mm, T-1 3/4 or equivalent 5mm diameter
- Height (Max): 8.70mm to 9.00mm (PCB clearance tolerance)
- Viewing Angle: 30° or narrower (wider angles acceptable for general indication)
Substitute parts must satisfy all primary compatibility criteria and fall within the electrical and mechanical ranges specified above. Parts from active manufacturers with current product status are prioritized for new designs.
Parameter Comparison
| Part Number | Manufacturer | Color | Vf (Typ) | mcd | Wavelength - Dominant | Viewing Angle | Height (Max) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| LTL2R3SRKNE | Lite-On Inc. | Red | 2.2V | 3200 | 630nm | 30° | 8.70mm | Obsolete | - |
| LTL2V3EUJS | Lite-On Inc. | Red | 2.1V | 4200 | 625nm | 36° | 12.40mm | Active | ROHS3 Compliant |
| 383-2SDRC/S530-A4 | Everlight Electronics Co Ltd | Red | 2V | 2780 | 639nm | 6° | 8.90mm | Active | - |
| 383-2SURC/S530-A6 | Everlight Electronics Co Ltd | Red | 2V | 6300 | 624nm | 6° | 8.90mm | Active | - |
| 7343-2SURC/H2/S400-A6 | Everlight Electronics Co Ltd | Red | 2V | 1600 | 624nm | 30° | 8.85mm | Active | ROHS3 Compliant |
| 7343-2SURC/H2/S400-A7 | Everlight Electronics Co Ltd | Red | 2V | 1600 | 624nm | 30° | 8.85mm | Active | ROHS3 Compliant |
| 7343-2SURC/H2/S400-A8 | Everlight Electronics Co Ltd | Red | 2V | 2000 | 624nm | 30° | 8.85mm | Active | ROHS3 Compliant |
| 7343-2USRC/S1060 | Everlight Electronics Co Ltd | Red | 2V | 4000 | 631nm | 30° | 8.85mm | Active | ROHS3 Compliant |
| 7383/R7C3-ARUB/P/MS | Everlight Electronics Co Ltd | Red | 2V | 7150 | 624nm | 30° | 9.00mm | Active | ROHS3 Compliant |
| C503B-RCN-CW0Z0AA1 | CreeLED, Inc. | Red | 2.1V | 7500 | 624nm | 30° | 10.30mm | Active | RoHS Compliant |
| HLMP-EG08-VY000 | Broadcom Limited | Red | 1.9V | 8100 | 626nm | 8° | 8.91mm | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
Parts 7343-2SURC/H2/S400-A7, 7343-2SURC/H2/S400-A8, and 7343-2USRC/S1060 from Everlight Electronics Co Ltd provide optimal mechanical and electrical compatibility. These components maintain the T-1 3/4 package format, 30° viewing angle, 2V forward voltage operation, and height specifications within 8.85mm. All three carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original part's environmental specifications.
Secondary Substitutes (Acceptable with Circuit Verification):
The 7383/R7C3-ARUB/P/MS offers higher brightness (7150mcd) with compatible electrical and mechanical parameters, though maximum height reaches 9.00mm. The C503B-RCN-CW0Z0AA1 from CreeLED provides active product status and RoHS compliance but exceeds height specification at 10.30mm, requiring PCB layout verification. The HLMP-EG08-VY000 from Broadcom operates at lower forward voltage (1.9V) with significantly higher brightness (8100mcd) and narrower viewing angle (8°), suitable only for applications where these characteristics align with circuit requirements.
Compatibility Constraints:
The LTL2V3EUJS, while from the same manufacturer, exceeds maximum height at 12.40mm and requires circuit redesign verification. Parts 383-2SDRC/S530-A4 and 383-2SURC/S530-A6 feature narrow viewing angles (6°), limiting their use to applications requiring directional indication.
Frequently Asked Questions (FAQ)
Q: Can the LTL2V3EUJS substitute for the LTL2R3SRKNE despite the height difference?
A: The LTL2V3EUJS exceeds the original part's maximum height by 3.70mm (12.40mm vs 8.70mm). Substitution requires verification that PCB clearance and mechanical constraints accommodate the increased height. Electrical parameters remain compatible within the 2.1V forward voltage specification.
Q: What is the significance of the 30° viewing angle in the original part?
A: The 30° viewing angle determines the light distribution pattern for indication applications. Substitute parts with equal or narrower viewing angles maintain directional characteristics. Parts with wider angles (such as the LTL2V3EUJS at 36°) distribute light over a broader area, potentially affecting visibility in specific mounting orientations.
Q: Are all substitute parts RoHS compliant?
A: Most active substitute parts carry ROHS3 or RoHS compliance certifications. The 383-2SDRC/S530-A4 and 383-2SURC/S530-A6 do not specify RoHS status in the provided data. Compliance verification is required for applications subject to RoHS regulations.
Q: How does forward voltage variation affect circuit design?
A: The original part operates at 2.2V typical forward voltage. Substitute parts range from 1.9V to 2.1V. Series resistor calculations must account for this variation to maintain consistent 20mA test current. A 0.3V reduction in forward voltage increases current through a fixed resistor by approximately 1.5mA, requiring resistor adjustment for precise current control.
Q: Which substitute offers the closest brightness match to the original 3200mcd specification?
A: The 7343-2SURC/H2/S400-A8 at 2000mcd and 383-2SDRC/S530-A4 at 2780mcd provide the closest brightness values. The 7343-2USRC/S1060 at 4000mcd offers higher brightness while maintaining all other compatibility parameters, suitable for applications tolerating increased luminous intensity.
Q: Can parts with different lens sizes substitute for the T-1 3/4 package?
A: The T-1 3/4 designation specifies a 5mm lens diameter. Substitute parts must maintain this 5mm specification for mechanical compatibility with existing PCB footprints and mechanical assemblies. Parts with different lens diameters require PCB redesign and mechanical fixture modification.
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