TLHE4600 Yellow LED T-1 Equivalent & Substitute Parts

Part Overview

The TLHE4600 is a yellow diffused 3mm T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division. This discrete indication LED operates at 1.9V forward voltage with a 26mcd brightness rating and 588nm dominant wavelength. The component is Active status and ROHS3 compliant. Substitute parts are necessary when the original part is unavailable, when alternative electrical characteristics better match circuit requirements, or when supply chain optimization is needed while maintaining functional compatibility.

Key Parameters

Parameter	TLHE4600 Value
Color	Yellow
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	26mcd
Wavelength - Dominant	588nm
Mounting Type	Through Hole
Package / Case	Radial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the TLHE4600 is based on the following allowed parameters: color (yellow), lens transparency (diffused), lens size (3mm T-1), mounting type (through hole), and package type (radial). Forward voltage tolerance is ±0.2V from the nominal 1.9V specification. Current rating must support the 20mA test condition. Brightness (millicandela) and viewing angle may vary within acceptable ranges for indication applications. Wavelength must remain in the yellow spectrum (580–595nm dominant). All substitute parts must be Active status and ROHS3 compliant.

Parts that deviate from these core parameters—such as orange color (SLI-343D8C3F, SLI-343D8U3F) or significantly different forward voltage (HLMP-1620 at 5V, HLMP-1621 at 12V)—are listed for reference but do not qualify as direct substitutes for the TLHE4600 in standard yellow LED indication circuits.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Wavelength - Dominant	Viewing Angle	Height (Max)	RoHS Status
TLHE4600	Vishay Semiconductor Opto Division	Yellow	Diffused	3mm, T-1	1.9V	20mA	26mcd	588nm	120°	6.10mm	ROHS3 Compliant
151031YS05900	Würth Elektronik	Yellow	Diffused	3.00mm Dia	2.1V	20mA	30mcd	590nm	60°	5.55mm	ROHS3 Compliant
LTL-4251	Lite-On Inc.	Yellow	Diffused	3mm, T-1	2.1V	10mA	8.7mcd	588nm	40°	6.55mm	ROHS3 Compliant
LTL-4251N	Lite-On Inc.	Yellow	Diffused	3mm, T-1	2.1V	10mA	5.6mcd	588nm	60°	5.85mm	ROHS3 Compliant
HLMP-1719	Broadcom Limited	Yellow	Diffused	3mm, T-1	1.8V	2mA	2.1mcd	585nm	50°	6.35mm	ROHS3 Compliant
HLMP-1719-A0002	Broadcom Limited	Yellow	Diffused	3mm, T-1	1.8V	2mA	2.1mcd	585nm	50°	6.35mm	ROHS3 Compliant
SLI-343Y8C3F	Rohm Semiconductor	Yellow	Clear	3.10mm Dia	2.2V	20mA	680mcd	590nm	40°	5.60mm	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Yellow Diffused, 3mm T-1, 20mA rated):

151031YS05900 (Würth Elektronik) is the primary substitute. It matches the TLHE4600 in color, lens transparency, size, and test current. Forward voltage is 2.1V versus 1.9V—a 0.2V increase within acceptable tolerance for most indication circuits. Brightness is slightly higher at 30mcd. Viewing angle is narrower at 60° versus 120°. All compliance certifications align.

Limited Substitutes (Yellow Diffused, 3mm T-1, reduced current):

LTL-4251 and LTL-4251N (Lite-On Inc.) share the same form factor and wavelength but operate at 10mA test current instead of 20mA. These are suitable only in circuits designed for lower current operation. LTL-4251N offers wider viewing angle (60°) and lower height (5.85mm) compared to LTL-4251.

Low-Current Alternative (Yellow Diffused, 3mm T-1, 2mA rated):

HLMP-1719 and HLMP-1719-A0002 (Broadcom Limited) are identical electrically but differ in packaging (Bulk versus Cut Tape). These operate at 1.8V and 2mA, suitable only for ultra-low-power indication applications. Brightness is significantly reduced at 2.1mcd.

Non-Substitute Reference (Yellow Clear, different lens transparency):

SLI-343Y8C3F (Rohm Semiconductor) has clear lens transparency instead of diffused. Although yellow and 3mm T-1, the optical characteristics differ fundamentally. This part is not a substitute for diffused-lens applications.

Non-Substitutes (Different color or voltage class):

HLMP-1620, HLMP-1621, SLI-343D8C3F, and SLI-343D8U3F are orange LEDs or operate at significantly different forward voltages (5V, 12V). These do not substitute for the TLHE4600.

Frequently Asked Questions (FAQ)

Q: Can I use 151031YS05900 as a direct replacement for TLHE4600?

A: Yes. Both are yellow diffused 3mm T-1 through-hole LEDs rated for 20mA. The 0.2V forward voltage difference (2.1V versus 1.9V) is within acceptable tolerance for indication circuits. Verify that your circuit can accommodate the narrower 60° viewing angle if wide-angle visibility is required.

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

A: Both are Lite-On yellow diffused T-1 LEDs at 2.1V and 10mA. LTL-4251N has a wider 60° viewing angle and shorter height (5.85mm) compared to LTL-4251 (40° angle, 6.55mm height). Choose based on your optical and mechanical constraints.

Q: Why are HLMP-1620 and HLMP-1621 listed if they don't substitute?

A: These Broadcom parts were included in the original substitute list but operate at 5V and 12V respectively, making them unsuitable for 1.9V circuits. They are referenced for completeness but should not be selected as replacements for the TLHE4600.

Q: Can I use SLI-343Y8C3F instead of TLHE4600?

A: No. Although both are yellow 3mm T-1 LEDs, SLI-343Y8C3F has a clear lens instead of diffused. This produces different light diffusion characteristics unsuitable for applications requiring the diffused optical properties of the TLHE4600.

Q: What does "diffused" versus "clear" lens mean for substitution?

A: Diffused lenses scatter light over a wider area with softer appearance. Clear lenses produce more focused, brighter light output. These are not interchangeable in applications where specific optical behavior is required.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this reference are ROHS3 compliant and suitable for applications with RoHS requirements.

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

A: These are electrically identical yellow diffused T-1 LEDs at 1.8V and 2mA. The difference is packaging: HLMP-1719 is supplied in Bulk, while HLMP-1719-A0002 is supplied in Cut Tape (CT). Select based on your assembly process requirements.

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