TLHB4401 Equivalent & Substitute Parts

Part Overview

The TLHB4401 is a blue diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 466nm and a typical forward voltage of 3.9V at 20mA test current. This part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity. The 21mcd brightness rating and 60° viewing angle establish the baseline performance envelope for equivalent alternatives.

Substiute Parts

TLHB4401

Vishay Semiconductor Opto DivisionIn Stock: 838TLHB4401 Datasheet

Current PartRFQ

SSL-LX305F6USBD

Lumex Opto/Components Inc.In Stock: 716SSL-LX305F6USBD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLHB4401 is determined by strict alignment across the following parameters: color (blue), lens transparency (diffused), lens style (round with domed top), physical package format (T-1 radial through-hole), mounting type (through-hole), and electrical operating characteristics (forward voltage range, test current, and viewing angle). The SSL-LX305F6USBD qualifies as a substitute based on matching these core criteria. While the SSL-LX305F6USBD exhibits a lower typical forward voltage (4.6V versus 3.9V) and higher brightness output (80mcd versus 21mcd), both parameters remain within acceptable substitution tolerances for indication-class LED applications. The wavelength specifications (dominant 466nm for TLHB4401 versus peak 470nm for SSL-LX305F6USBD) represent minor variations typical of blue LED technology and do not preclude functional equivalence in standard indication circuits.

Parameter Comparison

Engineering Selection Recommendations

The SSL-LX305F6USBD is suitable as a substitute for the obsolete TLHB4401 in indication applications. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The SSL-LX305F6USBD carries active product status, providing long-term availability and supply chain stability compared to the obsolete TLHB4401. The 0.4V reduction in typical forward voltage (4.6V versus 3.9V) requires circuit-level verification to confirm compatibility with existing current-limiting resistor designs. The increased brightness output (80mcd versus 21mcd) may necessitate adjustment of series resistor values to maintain consistent visual indication intensity if the original design relied on the lower brightness specification.

Frequently Asked Questions (FAQ)

Q: Can the SSL-LX305F6USBD directly replace the TLHB4401 without circuit modification?

A: Physical and functional compatibility is established through matching lens style, size, mounting type, and viewing angle. However, the 0.4V difference in forward voltage requires circuit evaluation. If the original design uses a fixed current-limiting resistor, the lower forward voltage of the SSL-LX305F6USBD will result in increased LED current. Recalculation of the series resistor value is necessary to maintain the intended 20mA test current.

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

A: The TLHB4401 operates at 21mcd while the SSL-LX305F6USBD operates at 80mcd. For indication applications where visual brightness is not a critical specification, this difference is acceptable. If the original design requires specific brightness levels, the series resistor must be adjusted accordingly to limit current and reduce the SSL-LX305F6USBD output to equivalent visual intensity.

Q: Are there any package or mounting differences that would affect PCB layout?

A: Both components use T-1 radial through-hole packages with round domed-top lenses. The maximum height difference (6.50mm for SSL-LX305F6USBD versus 6.10mm for TLHB4401) is 0.40mm and does not typically impact standard PCB designs. Mechanical clearance verification is recommended for applications with tight vertical space constraints.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the TLHB4401 and SSL-LX305F6USBD are ROHS3 compliant and REACH unaffected, maintaining equivalent regulatory status for applications requiring these certifications.