LTL-307PE LED Red Clear T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The LTL-307PE is a red LED indicator from Lite-On Inc., featuring a 5mm T-1 3/4 through-hole package with 657nm dominant wavelength and 8.7mcd brightness. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the through-hole mounting footprint, radial package configuration, and core electrical characteristics suitable for LED indication applications.

Substiute Parts

LTL-307PE

Lite-On Inc.In Stock: 1005LTL-307PE Datasheet

Current PartRFQ

HLMP-3366

Broadcom LimitedIn Stock: 873HLMP-3366 Datasheet

MFR RecommendedRFQ

HLMP-D155

Broadcom LimitedIn Stock: 9365HLMP-D155 Datasheet

MFR RecommendedRFQ

MV5152

onsemiIn Stock: 1148MV5152 Datasheet

MFR RecommendedRFQ

SLR-56VC3F

Rohm SemiconductorIn Stock: 3145SLR-56VC3F Datasheet

MFR RecommendedRFQ

SLR-56VCT32

Rohm SemiconductorIn Stock: 1029SLR-56VCT32 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

• Lens size: 5mm, T-1 3/4 (maintains PCB footprint compatibility)
• Mounting type: Through hole radial (preserves assembly process)
• Color: Red (maintains visual indication function)
• Lens transparency: Clear (preserves optical characteristics)
• Package / Case: Radial (ensures mechanical fit)

Electrical Tolerance Parameters:

• Forward voltage (Vf): Range 1.7V to 2.1V (acceptable for standard LED driver circuits)
• Wavelength - Dominant: Range 626nm to 657nm (red spectrum compatibility)
• Millicandela rating: 8.7mcd to 25mcd (brightness within acceptable indication range)
• Viewing angle: 24° to 50° (acceptable for indicator applications)

Compliance & Status:

• Active product status preferred for long-term availability
• RoHS3 compliance required for new designs
• MSL 1 (Unlimited) moisture sensitivity maintained across all substitutes

The following parts meet all primary compatibility requirements and fall within electrical tolerance parameters:

• HLMP-3366 (Broadcom Limited) - Active status, RoHS3 compliant
• HLMP-D155 (Broadcom Limited) - Active status, RoHS3 compliant
• SLR-56VC3F (Rohm Semiconductor) - Active status, RoHS3 compliant
• SLR-56VCT32 (Rohm Semiconductor) - Active status, RoHS3 compliant

MV5152 (onsemi) is excluded due to orange color specification, which does not meet the red color requirement for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

HLMP-3366 (Broadcom Limited) Active product status with RoHS3 compliance. Forward voltage of 1.9V is 0.2V lower than the original part, requiring circuit verification for current-limiting resistor adjustment. Higher millicandela rating (13.8mcd) and wider viewing angle (50°) provide enhanced visibility. Shorter height (6.35mm) may affect mechanical clearance in constrained layouts.

HLMP-D155 (Broadcom Limited) Active product status with RoHS3 compliance. Lowest forward voltage (1.7V) and test current (1mA) among substitutes, suitable for low-power applications. Narrower viewing angle (24°) and greater height (12.44mm) require layout consideration. Millicandela rating (10mcd) closely matches the original part.

SLR-56VC3F (Rohm Semiconductor) Active product status with RoHS3 compliance. Forward voltage (2V) and viewing angle (40°) closely match the original specification. Millicandela rating (25mcd) is higher, providing increased brightness. Height (8.90mm) is comparable to the original. Series designation (SLR-56) indicates established product line continuity.

SLR-56VCT32 (Rohm Semiconductor) Active product status with RoHS3 compliance. Electrical and optical characteristics identical to SLR-56VC3F. Tape & Box packaging differs from bulk packaging of SLR-56VC3F, affecting procurement and assembly processes. Height (8.90mm) and all electrical parameters match SLR-56VC3F.

Frequently Asked Questions (FAQ)

Q: Can HLMP-D155 be used in circuits designed for the LTL-307PE? A: HLMP-D155 is mechanically compatible but requires circuit analysis. The 0.4V lower forward voltage and significantly lower test current (1mA vs. 20mA) necessitate resistor recalculation to maintain proper LED brightness and current limiting.

Q: What is the primary difference between SLR-56VC3F and SLR-56VCT32? A: Both parts have identical electrical and optical specifications. The difference is packaging: SLR-56VC3F is supplied in bulk, while SLR-56VCT32 is supplied in tape and box format. Selection depends on assembly process requirements and procurement volume.

Q: Why is MV5152 not recommended as a substitute? A: MV5152 is an orange LED with 635nm peak wavelength, not a red LED. Color specification is a primary compatibility requirement for indicator applications and cannot be substituted without changing the visual indication function.

Q: Does height variation affect PCB layout compatibility? A: Yes. HLMP-3366 (6.35mm) is significantly shorter than the original (8.60mm), while HLMP-D155 (12.44mm) is taller. Height differences may affect mechanical clearance with adjacent components, solder joint stress, and visual alignment on the PCB. Layout verification is required.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All four recommended substitutes (HLMP-3366, HLMP-D155, SLR-56VC3F, SLR-56VCT32) are RoHS3 compliant, meeting environmental and regulatory requirements for new designs.

Q: Which substitute provides the closest electrical match to LTL-307PE? A: SLR-56VC3F and SLR-56VCT32 provide the closest match with 2V forward voltage (vs. 2.1V original), 10mA test current (vs. 20mA original), and 40° viewing angle (identical to original). Both are from the same SLR-56 series.