LTL-94PCK-TA Equivalent & Substitute Parts

Part Overview

The LTL-94PCK-TA is a red LED indication component manufactured by Lite-On Inc., configured as a 2-SMD, J-Lead surface mount device. This part is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing production and maintenance applications. The component operates at 1.8V forward voltage with a 50mcd brightness rating and 638nm dominant wavelength, designed for standard LED indication circuits requiring red spectrum output.

Substiute Parts

LTL-94PCK-TA

Lite-On Inc.In Stock: 1052LTL-94PCK-TA Datasheet

Current PartRFQ

HSMH-A100-N00J1

Broadcom LimitedIn Stock: 29163HSMH-A100-N00J1 Datasheet

DirectRFQ

VLMK3100-GS08

Vishay Semiconductor Opto DivisionIn Stock: 3389VLMK3100-GS08 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-94PCK-TA is determined by the following critical parameters:

• Color specification: Red
• Wavelength range: Dominant wavelength between 630nm and 660nm
• Brightness: 50mcd millicandela rating
• Forward voltage: 1.8V to 1.9V range
• Test current: 10mA to 20mA
• Viewing angle: 120°
• Lens style: Round with Flat Top
• Mounting type: Surface Mount
• Package configuration: 2-SMD or 2-PLCC

The substitute parts identified (HSMH-A100-N00J1 and VLMK3100-GS08) meet these core electrical and mechanical parameters, enabling functional equivalence in standard LED indication applications.

Parameter Comparison

Engineering Selection Recommendations

Both HSMH-A100-N00J1 (Broadcom Limited) and VLMK3100-GS08 (Vishay Semiconductor Opto Division) are active production components suitable for replacing the obsolete LTL-94PCK-TA.

HSMH-A100-N00J1 provides the closest electrical match with identical 50mcd brightness, 120° viewing angle, and 20mA test current specification. Forward voltage increases marginally from 1.8V to 1.9V. This part carries ROHS3 compliance and REACH unaffected status. Moisture sensitivity level is 2A (4 Weeks), requiring controlled storage conditions compared to the original part's unlimited MSL rating.

VLMK3100-GS08 offers an alternative with identical brightness and viewing angle specifications. Forward voltage matches the Broadcom substitute at 1.9V. Test current is specified at 10mA, representing a 50% reduction from the original 20mA specification. Physical dimensions show minor variations: lens diameter increases to 2.40mm, while overall height decreases to 1.85mm. This part also carries ROHS3 compliance and REACH unaffected status with 2A MSL rating.

Both substitutes are available in active production with established supply chains, addressing the obsolescence of the original component.

Frequently Asked Questions (FAQ)

Q: Can HSMH-A100-N00J1 and VLMK3100-GS08 be used interchangeably with LTL-94PCK-TA?

A: Both parts meet the core electrical parameters (red color, 50mcd brightness, 120° viewing angle, 1.9V forward voltage) and surface mount configuration. However, circuit design must accommodate the forward voltage increase from 1.8V to 1.9V. Physical dimensions vary slightly; verify PCB layout compatibility before substitution.

Q: What is the impact of the forward voltage change from 1.8V to 1.9V?

A: The 0.1V increase requires circuit current-limiting resistor recalculation. For applications operating at fixed voltage supplies, this change may reduce LED brightness slightly or require resistor value adjustment to maintain consistent current flow.

Q: Why does VLMK3100-GS08 specify 10mA test current while the original part uses 20mA?

A: Test current specification reflects the manufacturer's standard measurement condition and does not restrict operational current. Circuit design determines actual operating current through resistor selection. Both parts support 20mA operation within their electrical ratings.

Q: Are there packaging compatibility concerns?

A: LTL-94PCK-TA uses 2-SMD, J-Lead configuration. HSMH-A100-N00J1 uses 2-PLCC package, while VLMK3100-GS08 maintains 2-SMD, J-Lead configuration. Verify footprint compatibility with PCB design before selecting HSMH-A100-N00J1, as package differences may require layout modifications.

Q: What are the moisture sensitivity implications?

A: Original part has MSL 1 (Unlimited), allowing indefinite storage without moisture control. Both substitutes have MSL 2A (4 Weeks), requiring controlled storage conditions and bake-out procedures before reflow soldering if moisture exposure occurs. Implement appropriate moisture management protocols in production and storage environments.

Q: Do the substitute parts carry environmental compliance certifications?

A: Both HSMH-A100-N00J1 and VLMK3100-GS08 are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements for electronic components.