Equivalent & Substitute Parts for LTL2H3EX1K

Part Overview

The LTL2H3EX1K is a red LED indicator from Lite-On Inc., featuring a 5mm T-1 3/4 through-hole package with 5500mcd brightness and a 15° viewing angle. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates at 1.8V forward voltage with a 20mA test current and delivers red light at 629nm dominant wavelength.

Substiute Parts

LTL2H3EX1K

Lite-On Inc.In Stock: 1027LTL2H3EX1K Datasheet

Current PartRFQ

TLHK5800

Vishay Semiconductor Opto DivisionIn Stock: 2340TLHK5800 Datasheet

MFR RecommendedRFQ

HLMP-EG15-UX000

Broadcom LimitedIn Stock: 3378HLMP-EG15-UX000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LTL2H3EX1K is determined by the following critical parameters:

• Physical compatibility: 5mm T-1 3/4 lens size, through-hole radial package, round domed lens
• Optical characteristics: Red color, clear lens, wavelength range 626–630nm dominant
• Electrical compatibility: Forward voltage 1.8–1.9V, 20mA test current
• Brightness: Millicandela rating at or above 5500mcd
• Viewing angle: 15° or wider acceptable for direct replacement

Two substitute parts meet these criteria with active product status and full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both TLHK5800 and HLMP-EG15-UX000 are active production parts with full RoHS3 compliance and superior moisture sensitivity ratings compared to the obsolete LTL2H3EX1K.

HLMP-EG15-UX000 (Broadcom Limited) is the preferred parametric equivalent. It maintains the 15° viewing angle of the original part, matches the height specification within 0.31mm, and delivers higher brightness at 6250mcd. Both substitute parts operate at 1.9V forward voltage, requiring minimal circuit adjustment. HLMP-EG15-UX000 carries REACH Unaffected status.

TLHK5800 (Vishay Semiconductor Opto Division) provides an alternative with identical brightness and electrical characteristics. The narrower 8° viewing angle and increased height of 13.00mm require mechanical and optical design verification before implementation.

Both substitutes are available in bulk packaging with substantial inventory levels.

Frequently Asked Questions (FAQ)

Q: Can TLHK5800 replace LTL2H3EX1K directly in the circuit?

A: Electrical substitution is feasible. The forward voltage increases from 1.8V to 1.9V, requiring circuit verification. The 8° viewing angle is narrower than the original 15°, which may affect optical performance depending on application requirements. The increased height of 13.00mm versus 8.60mm requires mechanical clearance validation.

Q: Is HLMP-EG15-UX000 a drop-in replacement?

A: HLMP-EG15-UX000 maintains the 15° viewing angle and similar height profile (8.91mm versus 8.60mm). The forward voltage increases to 1.9V. Physical and electrical compatibility is high, though circuit verification for the 0.1V voltage increase is recommended.

Q: What are the compliance differences between the main part and substitutes?

A: The LTL2H3EX1K carries MSL 2A (4 Weeks) rating. Both TLHK5800 and HLMP-EG15-UX000 feature MSL 1 (Unlimited), indicating superior moisture protection. Both substitutes are ROHS3 Compliant; the original part does not specify RoHS status.

Q: Do the substitutes maintain the same wavelength?

A: Dominant wavelengths are 630nm (TLHK5800) and 626nm (HLMP-EG15-UX000) versus 629nm for the original. All three fall within the red spectrum range and are visually indistinguishable in typical indicator applications.

Q: Which substitute offers better availability?

A: HLMP-EG15-UX000 has 3304 pcs in stock. TLHK5800 has 2280 pcs in stock. Both exceed typical procurement requirements.