TLHY4600 Equivalent & Substitute Parts

Part Overview

The TLHY4600 is a yellow diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications. This part is active and in production with 5726 units currently in stock. The TLHY4600 operates at 2.4V forward voltage with a 4.6mcd brightness rating and 120° viewing angle, making it suitable for general-purpose LED indication circuits. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical form factor, and optical properties to ensure functional compatibility in circuit designs.

Key Parameters

Parameter	TLHY4600 Value
Color	Yellow
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Millicandela Rating	4.6mcd
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Viewing Angle	120°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLHY4600 are grouped based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
Lens Style: Round with Domed Top

Secondary Electrical Criteria:

Voltage - Forward (Vf): Range 1.8V to 7.5V (circuit design dependent)
Current - Test: 2mA to 20mA (application dependent)
Wavelength - Dominant: 585nm to 590nm (yellow spectrum)

Tertiary Mechanical Criteria:

Lens Size: 3mm T-1 or 5mm form factors
Height: 5.55mm to 9.57mm
Viewing Angle: 40° to 120°

Substitute parts meeting the primary criteria are considered functionally equivalent for general indication applications. Parts with different forward voltages require circuit redesign with appropriate current-limiting resistors. Parts with different lens sizes may require PCB layout modifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Wavelength - Dominant	Viewing Angle	Height (Max)	Product Status	RoHS Status
TLHY4600	Vishay Semiconductor Opto Division	Yellow	3mm, T-1	2.4V	10mA	4.6mcd	588nm	120°	6.10mm	Active	ROHS3 Compliant
151031YS05900	Würth Elektronik	Yellow	3.00mm Dia	2.1V	20mA	30mcd	590nm	60°	5.55mm	Active	ROHS3 Compliant
5219321F	Dialight	Yellow	4.83mm Dia	1.9V	2mA	1.8mcd	—	50°	9.57mm	Active	ROHS3 Compliant
5219322F	Dialight	Yellow	3.00mm Dia	7.5V	10mA	12.6mcd	590nm	60°	5.86mm	Active	ROHS3 Compliant
HLMP-1620	Broadcom Limited	Yellow	3mm, T-1	5V	10mA	2.2mcd	585nm	60°	6.35mm	Active	ROHS3 Compliant
HLMP-1621	Broadcom Limited	Yellow	3mm, T-1	12V	13mA	2.2mcd	585nm	60°	6.35mm	Active	ROHS3 Compliant
HLMP-1719	Broadcom Limited	Yellow	3mm, T-1	1.8V	2mA	2.1mcd	585nm	50°	6.35mm	Active	ROHS3 Compliant
HLMP-1719-A0002	Broadcom Limited	Yellow	3mm, T-1	1.8V	2mA	2.1mcd	585nm	50°	6.35mm	Active	ROHS3 Compliant
LTL-4251	Lite-On Inc.	Yellow	3mm, T-1	2.1V	10mA	8.7mcd	588nm	40°	6.55mm	Active	ROHS3 Compliant
LTL-4251N	Lite-On Inc.	Yellow	3mm, T-1	2.1V	10mA	5.6mcd	588nm	60°	5.85mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory compliance profile of the TLHY4600. Selection among substitutes depends on circuit voltage requirements and optical performance needs:

Direct Voltage Match (2.1V to 2.4V range): LTL-4251, LTL-4251N, and 151031YS05900 operate within the 2.1V to 2.4V forward voltage range, requiring minimal circuit redesign. These parts maintain compatibility with existing current-limiting resistor values designed for the TLHY4600.

T-1 Form Factor Match (3mm, T-1): HLMP-1620, HLMP-1621, HLMP-1719, HLMP-1719-A0002, LTL-4251, and LTL-4251N maintain identical T-1 mechanical form factor, ensuring direct PCB footprint compatibility without layout modifications.

Higher Voltage Applications (5V to 12V): HLMP-1620 (5V) and HLMP-1621 (12V) are suitable for higher voltage circuits but require circuit redesign with appropriate current-limiting resistors.

Lower Voltage Applications (1.8V to 1.9V): HLMP-1719, HLMP-1719-A0002, and 5219321F operate at reduced forward voltages suitable for low-power applications.

Larger Form Factor (5mm): 5219321F and 5219327F use 5mm lens diameter, requiring PCB layout modifications but offering different optical characteristics.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLHY4600 with any substitute part without circuit modification?

A: Direct replacement without modification is possible only with substitute parts matching the 2.1V to 2.4V forward voltage range: LTL-4251, LTL-4251N, and 151031YS05900. Parts with significantly different forward voltages (1.8V, 5V, 7.5V, or 12V) require recalculation of current-limiting resistor values to maintain proper LED current.

Q: What is the difference between HLMP-1719 and HLMP-1719-A0002?

A: Both parts are electrically and mechanically identical with matching electrical specifications (1.8V, 2mA test current, 2.1mcd, 585nm dominant wavelength). The primary difference is packaging: HLMP-1719 is supplied in Bulk packaging, while HLMP-1719-A0002 is supplied in Cut Tape (CT) packaging. Selection depends on assembly process requirements.

Q: Why do substitute parts have different millicandela ratings?

A: Millicandela rating reflects LED brightness at specified test current. The TLHY4600 operates at 4.6mcd at 10mA test current. Substitute parts with different test currents or manufacturing variations produce different brightness levels. Circuit design must account for brightness differences if visual indication intensity is critical.

Q: Can I use 5219321F or 5219327F as substitutes?

A: 5219321F is a yellow 5mm LED with different mechanical form factor and lower brightness (1.8mcd). 5219327F is a green LED and does not match the yellow color specification. These parts are not suitable substitutes for the TLHY4600 in standard indication applications requiring yellow color and T-1 form factor.

Q: What viewing angle differences exist among substitutes?

A: The TLHY4600 provides 120° viewing angle. Substitute parts range from 40° (LTL-4251) to 120° (TLHY4600). Narrower viewing angles concentrate light intensity in a specific direction, while wider angles distribute light more broadly. Circuit application determines acceptable viewing angle range.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the TLHY4600. This ensures compatibility with RoHS3 regulated assembly processes and end-use applications.

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