TLHB4400 Equivalent & Substitute Parts

Part Overview

The TLHB4400 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 forward voltage of 3.9V at 20mA test current. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with the T-1 3mm form factor, through-hole mounting configuration, and core optical and electrical parameters.

Substiute Parts

TLHB4400

Vishay Semiconductor Opto DivisionIn Stock: 837TLHB4400 Datasheet

Current PartRFQ

SSL-LX3044SBD/A

Lumex Opto/Components Inc.In Stock: 735SSL-LX3044SBD/A Datasheet

MFR RecommendedRFQ

SSL-LX305F6USBD

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

MFR RecommendedRFQ

SSL-LX30FT4USBD

Lumex Opto/Components Inc.In Stock: 1131SSL-LX30FT4USBD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLHB4400 are selected based on the following critical parameters that define functional equivalence:

Primary Compatibility Criteria:

• Color: Blue
• Lens Transparency: Diffused
• Lens Size: 3mm, T-1
• Mounting Type: Through Hole
• Package / Case: Radial
• Current - Test: 20mA
• RoHS Status: ROHS3 Compliant

Secondary Electrical Parameters (Allowable Variation):

• Voltage - Forward (Vf): Range 4.6V to 4.5V
• Millicandela Rating: 15mcd minimum
• Viewing Angle: 60° to 100°
• Wavelength - Peak: 428nm to 470nm (blue spectrum)
• Height (Max): Up to 6.70mm

All substitute parts listed maintain the T-1 through-hole radial configuration and are manufactured by Lumex Opto/Components Inc., an established supplier of optically equivalent components. All substitutes are active products with ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

SSL-LX3044SBD/A is the closest electrical match to the TLHB4400, with identical 60° viewing angle and similar wavelength characteristics (430nm peak vs. 428nm). The forward voltage is elevated at 4.5V compared to 3.9V, and brightness is doubled at 30mcd. This part is suitable for applications where the circuit can accommodate the higher forward voltage and where increased brightness is acceptable or beneficial. Height is reduced to 4.60mm, which may be advantageous in space-constrained designs.

SSL-LX305F6USBD and SSL-LX30FT4USBD both operate at 4.6V forward voltage, which is closer to the original 3.9V specification than the SSL-LX3044SBD/A. Both provide significantly higher brightness at 80mcd. The SSL-LX305F6USBD maintains the 60° viewing angle, while the SSL-LX30FT4USBD offers an expanded 100° viewing angle. Height specifications are 6.50mm and 6.70mm respectively, both compatible with the original 6.10mm maximum height. These parts are recommended for applications requiring lower forward voltage operation or where increased luminous intensity is required.

All substitute parts are active products with current manufacturing status and full ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SSL-LX3044SBD/A be used as a direct replacement for TLHB4400?

A: SSL-LX3044SBD/A is mechanically and optically compatible as a T-1 3mm diffused blue LED with through-hole radial mounting. The primary difference is forward voltage (4.5V vs. 3.9V) and brightness (30mcd vs. 15mcd). Direct substitution is possible if the circuit design accommodates the higher forward voltage and increased brightness does not create unintended visual effects.

Q: What is the difference between SSL-LX305F6USBD and SSL-LX30FT4USBD?

A: Both parts share identical electrical specifications (4.6V forward voltage, 80mcd brightness, 20mA test current) and are housed in T-1 3mm diffused blue packages. The primary distinction is viewing angle: SSL-LX305F6USBD provides 60° viewing angle (matching TLHB4400), while SSL-LX30FT4USBD provides 100° viewing angle for wider light distribution. Height differs slightly (6.50mm vs. 6.70mm).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SSL-LX3044SBD/A, SSL-LX305F6USBD, SSL-LX30FT4USBD) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original TLHB4400.

Q: What is the impact of forward voltage differences on circuit design?

A: Forward voltage directly affects series resistor calculations and power supply requirements. The TLHB4400 operates at 3.9V, while SSL-LX3044SBD/A requires 4.5V and SSL-LX305F6USBD/SSL-LX30FT4USBD operate at 4.6V. Circuits must be re-evaluated to ensure the selected substitute part operates within the available voltage headroom and that series resistor values are recalculated to maintain 20mA test current.

Q: Can wavelength differences affect application performance?

A: Wavelength differences within the blue spectrum (428nm to 470nm) are generally imperceptible to human vision but may affect optical sensor response or color-matching applications. TLHB4400 has a peak wavelength of 428nm, while substitutes range from 430nm to 470nm. Verify wavelength compatibility if the application involves color-critical indication or optical sensing.

Q: Is the height difference between TLHB4400 (6.10mm) and SSL-LX3044SBD/A (4.60mm) significant?

A: The SSL-LX3044SBD/A is 1.50mm shorter, which may be advantageous in space-constrained PCB designs. However, verify that the reduced height does not conflict with mechanical clearance requirements or aesthetic considerations in the final assembly.