Equivalent & Substitute Parts for TLHY4605

Part Overview

The TLHY4605 is a yellow diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division. This component is designed for LED indication applications with a dominant wavelength of 588nm and a typical forward voltage of 2.4V at 10mA test current. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified to provide design flexibility for applications requiring equivalent optical and electrical performance, alternative sourcing, or specific packaging requirements.

Key Parameters

Parameter	TLHY4605 Value
Color	Yellow
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Millicandela Rating	5mcd
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Viewing Angle	120°
Mounting Type	Through Hole
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLHY4605 are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
Wavelength Range: 583nm to 590nm (yellow spectrum)
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

Lens Size: 3mm T-1 form factor (primary group) or 5mm form factor (alternative group)
Voltage - Forward (Vf): Range 1.8V to 7.5V (application-dependent selection)
Current - Test: 2mA to 20mA (application-dependent selection)
Viewing Angle: 40° to 120° (application-dependent selection)
Millicandela Rating: 1.8mcd to 30mcd (brightness-dependent selection)

Substitutes are divided into two functional groups: T-1 3mm form factor equivalents (direct mechanical replacement) and 5mm form factor alternatives (requiring PCB layout modification). Within each group, parts are further differentiated by electrical characteristics to match specific circuit requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	Current - Test	Millicandela	Viewing Angle	Wavelength - Dominant	Height (Max)	RoHS Status	Product Status
TLHY4605	Vishay Semiconductor Opto Division	Yellow	3mm, T-1	2.4V	10mA	5mcd	120°	588nm	6.10mm	ROHS3 Compliant	Active
151031YS05900	Würth Elektronik	Yellow	3.00mm Dia	2.1V	20mA	30mcd	60°	590nm	5.55mm	ROHS3 Compliant	Active
5219321F	Dialight	Yellow	4.83mm Dia	1.9V	2mA	1.8mcd	50°	-	9.57mm	ROHS3 Compliant	Active
5219322F	Dialight	Yellow	3.00mm Dia	7.5V	10mA	12.6mcd	60°	590nm	5.86mm	ROHS3 Compliant	Active
HLMP-1620	Broadcom Limited	Yellow	3mm, T-1	5V	10mA	2.2mcd	60°	585nm	6.35mm	ROHS3 Compliant	Active
HLMP-1621	Broadcom Limited	Yellow	3mm, T-1	12V	13mA	2.2mcd	60°	585nm	6.35mm	ROHS3 Compliant	Active
HLMP-1719	Broadcom Limited	Yellow	3mm, T-1	1.8V	2mA	2.1mcd	50°	585nm	6.35mm	ROHS3 Compliant	Active
HLMP-1719-A0002	Broadcom Limited	Yellow	3mm, T-1	1.8V	2mA	2.1mcd	50°	585nm	6.35mm	ROHS3 Compliant	Active
LTL-4251	Lite-On Inc.	Yellow	3mm, T-1	2.1V	10mA	8.7mcd	40°	588nm	6.55mm	ROHS3 Compliant	Active
LTL-4251N	Lite-On Inc.	Yellow	3mm, T-1	2.1V	10mA	5.6mcd	60°	588nm	5.85mm	ROHS3 Compliant	Active

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term availability. Selection among substitutes depends on circuit voltage requirements and optical performance specifications.

For 2.0V to 2.5V Circuit Applications: LTL-4251N and 151031YS05900 provide direct electrical compatibility with the TLHY4605. LTL-4251N offers closest wavelength match (588nm) and similar brightness (5.6mcd). The 151031YS05900 provides higher brightness (30mcd) at slightly lower forward voltage (2.1V) with comparable wavelength (590nm).

For Low-Voltage Applications (1.8V to 2.0V): HLMP-1719 and HLMP-1719-A0002 (identical electrical specifications, different packaging) operate at 1.8V with 2mA test current, suitable for battery-powered or low-power circuits. Both maintain T-1 form factor compatibility.

For Higher-Voltage Applications (5V to 12V): HLMP-1620 (5V) and HLMP-1621 (12V) accommodate higher supply voltages while maintaining T-1 mechanical compatibility. These parts require circuit design consideration for voltage drop and current limiting.

For Alternative Form Factors: 5219321F and 5219322F provide 5mm form factor alternatives when PCB layout permits. 5219322F maintains 3mm diameter with higher brightness (12.6mcd) at elevated forward voltage (7.5V). 5219321F operates at lowest forward voltage (1.9V) with minimal brightness (1.8mcd).

Frequently Asked Questions (FAQ)

Q: Can HLMP-1620 or HLMP-1621 directly replace TLHY4605 in a 2.4V circuit?

A: No. HLMP-1620 requires 5V and HLMP-1621 requires 12V forward voltage. Direct substitution would result in insufficient LED current and non-operation. Circuit redesign with appropriate current-limiting resistor values is required for these higher-voltage parts.

Q: What is the difference between LTL-4251 and LTL-4251N?

A: Both parts share identical electrical specifications (2.1V forward voltage, 10mA test current, 588nm wavelength). The primary differences are brightness (8.7mcd vs 5.6mcd) and viewing angle (40° vs 60°). LTL-4251N provides wider viewing angle and lower brightness, closer to TLHY4605 specifications.

Q: Are 5219321F and 5219322F mechanically compatible with TLHY4605 PCB footprints?

A: No. These parts use 5mm form factor (4.83mm diameter) compared to TLHY4605 T-1 3mm form factor. PCB layout modification is required. 5219322F height is 9.57mm versus TLHY4605 at 6.10mm, requiring clearance verification.

Q: Which substitute provides the closest overall match to TLHY4605?

A: LTL-4251N offers the closest functional equivalence: identical T-1 3mm form factor, matching wavelength (588nm), similar brightness (5.6mcd vs 5mcd), compatible forward voltage (2.1V vs 2.4V), and identical test current (10mA). Mechanical and electrical substitution requires only minor circuit resistor adjustment.

Q: Is HLMP-1719-A0002 different from HLMP-1719 in electrical performance?

A: No. Both parts have identical electrical and optical specifications. The difference is packaging: HLMP-1719 is supplied in Bulk packaging while HLMP-1719-A0002 is supplied in Cut Tape (CT) packaging. Selection depends on procurement and assembly requirements.

Q: Can 151031YS05900 replace TLHY4605 despite higher brightness (30mcd)?

A: Yes, for applications where increased brightness is acceptable or beneficial. The 151031YS05900 maintains compatible T-1 form factor, similar forward voltage (2.1V vs 2.4V), and identical test current (10mA). The 30mcd brightness is higher but not incompatible; circuit design must accommodate the increased light output.

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