LTL201 Equivalent & Substitute Parts

Part Overview

The LTL201 is a red diffused through-hole LED manufactured by Lite-On Inc., specified for 651nm red indication applications with a 1.7V forward voltage and 1.1mcd brightness rating. The product is classified as obsolete, necessitating identification of active equivalent components that maintain functional compatibility for new designs or production continuity.

Substiute Parts

LTL201

Lite-On Inc.In Stock: 843LTL201 Datasheet

Current PartRFQ

HLMP-1700-B0002

Broadcom LimitedIn Stock: 21052HLMP-1700-B0002 Datasheet

MFR RecommendedRFQ

WP908A8ID

KingbrightIn Stock: 2897WP908A8ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL201 is determined by the following critical parameters:

• Color and Wavelength: Red spectrum (625–651nm dominant wavelength) for visual indication compatibility
• Lens Configuration: Diffused lens with 3mm diameter for optical consistency
• Mounting Type: Through-hole radial package for PCB compatibility
• Voltage Range: Forward voltage tolerance within 1.7V–2.0V for circuit design compatibility
• Current Rating: Test current at or above 20mA operational specification
• Lens Style: Round with domed top for form factor consistency

Both identified substitutes meet these core criteria while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

HLMP-1700-B0002 (Broadcom Limited): This substitute maintains identical forward voltage (1.7V) and radial through-hole package configuration. Product status is active with ROHS3 compliance. The reduced test current (2mA vs. 20mA) and narrower viewing angle (50° vs. 76°) represent operational differences that require circuit validation. Dominant wavelength shift from 651nm to 626nm remains within red spectrum tolerance for indication applications.

WP908A8ID (Kingbright): This substitute provides the highest brightness rating (20mcd) and maintains 20mA test current specification matching the original design. Forward voltage increases to 2V, requiring circuit recalculation for current-limiting resistor values. Viewing angle (80°) exceeds the original specification. Product status is active with ROHS3 compliance. Dominant wavelength (625nm) aligns with red spectrum requirements.

Both substitutes are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1700-B0002 directly replace LTL201 in existing designs? A: Electrical compatibility exists at 1.7V forward voltage. However, the reduced test current specification (2mA vs. 20mA) and narrower viewing angle (50° vs. 76°) require circuit validation to confirm adequate brightness and optical coverage for the intended application.

Q: What circuit modifications are needed for WP908A8ID substitution? A: The forward voltage increase from 1.7V to 2V requires recalculation of the series current-limiting resistor. Using the formula R = (Vsupply − Vf) / If, the resistor value will increase proportionally. No other circuit modifications are necessary for through-hole mounting compatibility.

Q: Are both substitutes mechanically compatible with LTL201 PCB footprints? A: Yes. Both substitutes maintain radial through-hole package configuration with 3mm lens diameter and similar height specifications (5.50mm and 6.35mm vs. 5.25mm original), supporting standard LED footprints. Minor height variation does not affect PCB assembly compatibility.

Q: How do wavelength differences affect visual appearance? A: All three parts operate in the red spectrum (625–651nm dominant wavelength). The shift from 651nm to 625–626nm produces a perceptually similar red indication. Dominant wavelength differences of this magnitude do not create visible color distinction in typical indication applications.

Q: Which substitute offers the best brightness match? A: WP908A8ID provides 20mcd brightness, significantly exceeding the original 1.1mcd specification. HLMP-1700-B0002 provides 2.1mcd, closer to the original rating. Brightness selection depends on application requirements and circuit design constraints.

Q: Are compliance certifications equivalent between substitutes? A: Both active substitutes carry ROHS3 compliance and REACH unaffected status. The obsolete LTL201 does not specify these certifications. For applications requiring modern environmental compliance, both substitutes meet current regulatory standards.