TLHY6405-BTZ Yellow LED T-1 3/4 Equivalent & Substitute Parts

Part Overview

The TLHY6405-BTZ is a yellow diffused LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications in through-hole configurations. This component features a 5mm T-1 3/4 lens form factor with a dominant wavelength of 588nm and a forward voltage of 2.4V at 10mA test current. The part is currently obsolete, making identification of compatible substitutes essential for ongoing production support and legacy system maintenance.

Substiute Parts

TLHY6405-BTZ

Vishay Semiconductor Opto DivisionIn Stock: 713TLHY6405-BTZ Datasheet

Current PartRFQ

LTL-4253

Lite-On Inc.In Stock: 21408LTL-4253 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLHY6405-BTZ is determined by the following critical parameters:

Primary Substitution Criteria:

• Color: Yellow (588nm dominant wavelength, 585nm peak wavelength)
• Lens form factor: 5mm T-1 3/4 diffused lens
• Mounting configuration: Through-hole radial package
• Electrical compatibility: Forward voltage and current ratings within acceptable operating range

Substitute Identification: The LTL-4253 from Lite-On Inc. meets the primary substitution criteria. Both components share identical color specifications, lens form factor, mounting type, and wavelength characteristics. The LTL-4253 maintains compatibility with circuit designs originally specified for the TLHY6405-BTZ while offering improved availability and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LTL-4253 is the designated manufacturer-recommended substitute for the obsolete TLHY6405-BTZ. Selection of this substitute is supported by the following factors:

Product Status: The LTL-4253 is in active production, ensuring long-term availability and supply chain stability compared to the obsolete TLHY6405-BTZ.

Compliance: The LTL-4253 is ROHS3 compliant and REACH affected, meeting current environmental and regulatory requirements. The original TLHY6405-BTZ is RoHS non-compliant, making the substitute preferable for new designs and updated production runs.

Physical Compatibility: Both components use identical 5mm T-1 3/4 through-hole radial packages with negligible height variation (0.4mm difference), ensuring direct mechanical compatibility with existing PCB layouts and component placement equipment.

Optical Characteristics: Both parts emit at the same dominant wavelength (588nm) and peak wavelength (585nm), maintaining color consistency in indication applications. The LTL-4253 provides higher brightness (19mcd versus 14mcd) and a narrower viewing angle (36° versus 60°), which may require circuit-level evaluation depending on application requirements.

Electrical Characteristics: The forward voltage difference (2.1V for LTL-4253 versus 2.4V for TLHY6405-BTZ) represents a 0.3V reduction. Circuit designs must accommodate this voltage variation through appropriate current-limiting resistor adjustment or verification of circuit tolerance margins.

Frequently Asked Questions (FAQ)

Q: Can the LTL-4253 be used as a direct drop-in replacement for the TLHY6405-BTZ?

A: The LTL-4253 is mechanically and optically compatible with the TLHY6405-BTZ due to identical lens form factor, color, and wavelength specifications. However, the 0.3V forward voltage difference requires circuit verification. If the original circuit uses a fixed current-limiting resistor, recalculation may be necessary to maintain proper LED current and brightness levels.

Q: What is the significance of the viewing angle difference between these parts?

A: The TLHY6405-BTZ has a 60° viewing angle, while the LTL-4253 has a 36° viewing angle. This means the LTL-4253 produces a more directional light output. Applications requiring wide-angle indication may need circuit-level brightness compensation due to the narrower beam pattern, despite the higher millicandela rating of the substitute.

Q: Are there any compliance or regulatory differences between these parts?

A: Yes. The TLHY6405-BTZ is RoHS non-compliant, while the LTL-4253 is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the LTL-4253 is the appropriate choice. The LTL-4253 is also REACH affected, indicating compliance with REACH chemical substance regulations.

Q: What is the impact of the brightness difference on circuit design?

A: The LTL-4253 provides 19mcd compared to 14mcd for the TLHY6405-BTZ, representing a 36% increase in brightness. Depending on the application, this may require adjustment of the current-limiting resistor to prevent over-brightness or excessive power consumption. Circuit design review is recommended for brightness-sensitive applications.

Q: Are the packages identical?

A: Both components use radial through-hole packages with 5mm T-1 3/4 form factors. The maximum height differs by 0.4mm (9.00mm for TLHY6405-BTZ versus 8.60mm for LTL-4253), which is negligible for standard PCB layouts and does not affect component placement or soldering processes.