TLHY4601 Equivalent & Substitute Parts

Part Overview

The TLHY4601 is a yellow diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 588nm. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The TLHY4601 operates at 2.4V forward voltage with a 4mcd luminous intensity and 120° viewing angle in a 3mm radial package.

Key Parameters

Parameter	TLHY4601 Value
Color	Yellow
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Wavelength - Dominant	588nm
Mounting Type	Through Hole
Package / Case	Radial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TLHY4601 is determined by the following critical parameters: color (yellow), lens transparency (diffused), mounting type (through hole), package type (radial), and wavelength range (585-591nm). Forward voltage tolerance ranges from 1.9V to 7.5V across available substitutes, and luminous intensity varies from 1.8mcd to 200mcd depending on application requirements. All substitute parts maintain ROHS3 compliance and radial through-hole mounting configuration.

Substitutes are grouped into two categories: direct form-factor replacements (T-1 3mm lens style) and alternative 3mm round lens configurations. Direct replacements preserve the original lens geometry and viewing angle characteristics, while alternative configurations offer different optical properties suitable for modified circuit designs.

Parameter Comparison

Parameter	TLHY4601	TLHY4605	1254-10UYD/S530-A3	264-7UYD/S530-A3	3YD-F	414-10UYD/S530-A3	5219322F	HLMP-1620
Manufacturer	Vishay	Vishay	Everlight	Everlight	Bivar	Everlight	Dialight	Broadcom
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	3mm, T-1	3mm, T-1	3.00mm Dia	2.90mm Dia	3mm, T-1	3.00mm Dia	3.00mm Dia	3mm, T-1
Voltage - Forward (Vf) (Typ)	2.4V	2.4V	2V	2V	2V	2V	7.5V	5V
Current - Test	10mA	10mA	20mA	20mA	20mA	20mA	10mA	10mA
Millicandela Rating	4mcd	5mcd	200mcd	125mcd	20mcd	40mcd	12.6mcd	2.2mcd
Viewing Angle	120°	120°	30°	60°	35°	120°	60°	60°
Wavelength - Dominant	588nm	588nm	589nm	589nm	—	589nm	590nm	585nm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For direct replacement of the TLHY4601 in existing designs, TLHY4605 from Vishay provides the closest electrical and mechanical compatibility. Both parts share identical forward voltage (2.4V), test current (10mA), lens size (3mm T-1), and viewing angle (120°). TLHY4605 is currently in active production status with higher inventory availability.

For applications requiring modified optical characteristics, 414-10UYD/S530-A3 from Everlight maintains the 120° viewing angle and 2V forward voltage but operates at 20mA test current with 40mcd luminous intensity. This part is available in Tape & Reel packaging for automated assembly.

HLMP-1620 from Broadcom offers an active-status alternative with T-1 form factor compatibility but requires circuit redesign due to 5V forward voltage specification. This part is suitable only for applications with higher voltage supply rails.

All substitute parts maintain ROHS3 compliance and radial through-hole mounting configuration, ensuring regulatory compliance and mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can TLHY4605 be used as a direct replacement for TLHY4601?

A: Yes. TLHY4605 shares identical electrical parameters (2.4V forward voltage, 10mA test current) and mechanical specifications (3mm T-1 lens, 120° viewing angle, radial through-hole package). The primary difference is luminous intensity (5mcd vs. 4mcd), which represents a minor brightness increase suitable for most indication applications.

Q: What is the key difference between T-1 lens style and 3.00mm round lens alternatives?

A: T-1 refers to a specific lens geometry with domed top profile standardized for 3mm diameter packages. Alternative 3.00mm round configurations may have different lens profiles (flat top vs. domed top) affecting light distribution and viewing angle characteristics. Mechanical fit in existing PCB holes remains compatible.

Q: Why do some substitutes have significantly different forward voltages?

A: Forward voltage variation (1.9V to 7.5V) reflects different LED chip technologies and internal series resistor configurations across manufacturers. Selection must match the circuit's voltage supply and current-limiting resistor design. Substitutes with 2V forward voltage are most compatible with the original 2.4V design.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, meeting regulatory requirements for hazardous substance restrictions in electronic equipment.

Q: What packaging options are available for production quantities?

A: TLHY4605 and most Everlight parts are available in Bulk packaging. 414-10UYD/S530-A3 is available in Tape & Reel format for automated pick-and-place assembly. Packaging selection depends on production volume and assembly methodology.

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