TLHF4600 Equivalent & Substitute Parts

Part Overview

The TLHF4600 is an orange diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 605nm. This part operates at 2V forward voltage with a 26mcd brightness rating and features a 120° viewing angle in a 3mm radial package. The product is currently active and ROHS3 compliant.

Substitute parts are necessary when the TLHF4600 becomes unavailable, when design requirements shift to different voltage specifications, or when alternative brightness levels are required for specific application needs.

Key Parameters

Parameter	TLHF4600 Value
Color	Orange
Wavelength - Dominant	605nm
Voltage - Forward (Vf) Typical	2V
Current - Test	20mA
Millicandela Rating	26mcd
Lens Transparency	Diffused
Lens Size	3mm, T-1
Viewing Angle	120°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the TLHF4600 is based on the following critical parameters:

Color and Wavelength: Orange 605nm specification defines the primary functional requirement
Voltage Rating: Forward voltage of 2V determines circuit compatibility
Package Type: T-1 radial through-hole configuration ensures mechanical and electrical fit
Lens Characteristics: Diffused lens with 3mm size maintains form factor
Brightness Level: 26mcd rating establishes the luminous intensity requirement

Substitute parts must maintain compatibility across these parameters. Parts with different colors (yellow), significantly different voltage ratings (5V, 12V, 1.8V), or substantially different brightness levels represent functional alternatives rather than direct substitutes.

Parameter Comparison

Parameter	TLHF4600	SLR-332DU3F	SLR-343DU3F
Manufacturer	Vishay Semiconductor Opto Division	Rohm Semiconductor	Rohm Semiconductor
Color	Orange	Orange	Orange
Wavelength - Dominant	605nm	605nm	605nm
Voltage - Forward (Vf) Typical	2V	2V	2V
Current - Test	20mA	10mA	10mA
Millicandela Rating	26mcd	10mcd	16mcd
Lens Transparency	Diffused	Diffused	Diffused
Lens Size	3mm, T-1	3.20mm Dia	3.10mm Dia
Viewing Angle	120°	85°	40°
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial
Height (Max)	6.10mm	4.60mm	5.40mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Not For New Designs	Active

Engineering Selection Recommendations

SLR-343DU3F is the primary substitute for the TLHF4600. Both parts share identical voltage specifications (2V forward), matching wavelength (605nm orange), and equivalent package configuration (T-1 radial through-hole). The SLR-343DU3F is currently active and ROHS3 compliant. The primary difference is brightness: the SLR-343DU3F provides 16mcd compared to the TLHF4600's 26mcd, and a narrower viewing angle of 40° versus 120°. This part is suitable when brightness reduction is acceptable for the application.

SLR-332DU3F is an alternative orange LED with matching voltage and wavelength specifications. This part is marked "Not For New Designs" and should be used only when existing inventory constraints or legacy design requirements necessitate its use. It provides 10mcd brightness with an 85° viewing angle.

Yellow-colored alternatives (HLMP series, LTL series, SLR-332YY3F, SLR-342YY3F) differ fundamentally in color and wavelength and are not direct substitutes for orange indication applications.

Frequently Asked Questions (FAQ)

Q: Can I use a yellow LED as a substitute for the TLHF4600 orange LED?

A: No. The TLHF4600 is specified for orange indication at 605nm wavelength. Yellow LEDs operate at 585-588nm and produce visually distinct color output. Substitution is not appropriate unless the application requirements explicitly permit color change.

Q: What is the impact of different brightness ratings when selecting a substitute?

A: The TLHF4600 provides 26mcd brightness. Substitute parts with lower brightness (SLR-332DU3F at 10mcd, SLR-343DU3F at 16mcd) may reduce visibility in high-ambient-light environments. Brightness selection depends on application visibility requirements and circuit current limitations.

Q: Are there voltage compatibility concerns with substitute parts?

A: The TLHF4600 operates at 2V forward voltage. Both recommended orange substitutes (SLR-332DU3F and SLR-343DU3F) also operate at 2V, ensuring direct circuit compatibility. Yellow alternatives operate at different voltages (1.8V, 2.1V, 5V, 12V) and require circuit redesign.

Q: Does the viewing angle difference affect substitution suitability?

A: The TLHF4600 provides a 120° viewing angle. SLR-343DU3F offers 40° and SLR-332DU3F offers 85°. Narrower viewing angles concentrate light intensity but reduce peripheral visibility. Application requirements determine whether angle reduction is acceptable.

Q: What is the significance of "Not For New Designs" status?

A: SLR-332DU3F is marked "Not For New Designs," indicating the manufacturer no longer recommends this part for new product development. Use this part only for legacy system maintenance or when existing inventory must be consumed. For new designs, select SLR-343DU3F or maintain TLHF4600 sourcing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both recommended orange substitutes (SLR-332DU3F and SLR-343DU3F) are ROHS3 compliant, matching the TLHF4600 compliance status. All parts listed carry ROHS3 certification.

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