TLHY6401 Yellow LED T-1 3/4 Through Hole Equivalent & Substitute Parts

Part Overview

The TLHY6401 is a yellow 588nm LED indicator in T-1 3/4 (5mm) through-hole radial package manufactured by Vishay Semiconductor Opto Division. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The TLHY6401 delivers 12mcd at 10mA forward current with a 2.4V typical forward voltage and 60° viewing angle, designed for discrete LED indication applications in electronic equipment.

Key Parameters

Parameter	TLHY6401 Value
Color	Yellow
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) Typical	2.4V
Current - Test	10mA
Millicandela Rating	12mcd
Viewing Angle	60°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	9.00mm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TLHY6401 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Color: Yellow
Mounting Type: Through Hole Radial
Lens Size: 5mm, T-1 3/4 package
Lens Transparency: Diffused
Wavelength Range: 585nm to 591nm (dominant and peak)
Forward Voltage: 2.0V to 2.4V typical
Viewing Angle: 15° to 65°
RoHS3 Compliance

Substitution Logic: Parts are grouped as direct substitutes when they maintain the same physical form factor (T-1 3/4 through-hole radial), color (yellow), and lens characteristics (diffused, round domed top). Electrical parameters including forward voltage, test current, and wavelength must fall within compatible ranges to ensure circuit-level compatibility. Parts with active product status are preferred over obsolete alternatives. Compliance certifications (RoHS3, REACH) must be maintained.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength - Dominant (nm)	Vf Typical (V)	Test Current (mA)	Millicandela (mcd)	Viewing Angle (°)	Lens Transparency	Height Max (mm)	Product Status	RoHS3
TLHY6401	Vishay	Yellow	588	2.4	10	12	60	Diffused	9.00	Obsolete	Yes
TLHY6405	Vishay	Yellow	588	2.4	10	14	60	Diffused	9.00	Active	Yes
1383UYD/S530-A3	Everlight	Yellow	589	2.0	20	800	25	Diffused	8.90	Active	Not specified
5219673F	Dialight	Yellow	588	2.1	20	12.6	60	Diffused	8.21	Active	Yes
HLMP-3650-C00B2	Broadcom	Yellow	583	5.0	10	2.2	60	Diffused, Tinted	Not specified	Active	Yes
HLMP-C315	Broadcom	Yellow	589	2.1	20	300	15	Clear	8.91	Active	Yes
HLMP-C323	Broadcom	Yellow	589	2.1	20	170	25	Clear	8.91	Active	Yes
LTL-307Y	Lite-On	Yellow	590	2.1	20	29	50	Diffused	8.60	Active	Yes
LTL-307Y-002	Lite-On	Yellow	588	2.1	20	29	50	Diffused	9.85	Active	Yes
LTL-4253-012	Lite-On	Yellow	588	2.1	20	19	36	Diffused	9.85	Active	Yes
MV5353	onsemi	Yellow	Not specified	2.1	20	15	65	Diffused	8.89	Obsolete	Not specified

Engineering Selection Recommendations

Primary Substitute - TLHY6405 (Vishay): TLHY6405 is the direct manufacturer equivalent with active product status. It maintains identical electrical characteristics (2.4V Vf, 10mA test current, 588nm wavelength) and mechanical form factor (T-1 3/4, 9.00mm height, 60° viewing angle). The only difference is increased brightness (14mcd vs. 12mcd), which is compatible with existing circuit designs. RoHS3 compliance is maintained. This is the preferred substitute for direct replacement.

Secondary Substitutes - Lite-On LTL-307Y and LTL-307Y-002: Both Lite-On parts maintain diffused lens transparency, T-1 3/4 form factor, and compatible wavelengths (588-590nm). Forward voltage is slightly lower (2.1V vs. 2.4V), and test current is higher (20mA vs. 10mA). These parts are suitable for applications where the circuit can accommodate the voltage and current differences. LTL-307Y-002 in tape & reel packaging offers the closest wavelength match (588nm) to the original part.

Secondary Substitute - Dialight 5219673F: This part provides close electrical compatibility (2.1V Vf, 588nm wavelength, 12.6mcd brightness) with active product status and RoHS3 compliance. The 60° viewing angle matches the original. Height is slightly reduced (8.21mm vs. 9.00mm), which may affect mechanical fit in some applications. Lens size is 4.75mm diameter versus 5mm, representing a minor form factor variation.

Alternative Substitute - Broadcom HLMP-C323: HLMP-C323 offers active status and RoHS3 compliance with compatible wavelength (589nm) and forward voltage (2.1V). However, it features a clear lens rather than diffused, resulting in different optical characteristics (170mcd at 25° viewing angle vs. 12mcd at 60°). This part is suitable only for applications where clear lens transparency is acceptable and the narrower viewing angle is compatible with the design.

Not Recommended - HLMP-3650-C00B2 (Broadcom): This part has a 5V voltage rating and right-angle mounting configuration, making it incompatible with the original through-hole radial design. The 2.2mcd brightness is significantly lower than the original 12mcd specification.

Not Recommended - 1383UYD/S530-A3 (Everlight): While this part is active and diffused, the 20mA test current and 800mcd brightness represent a significant departure from the original specification. The 25° viewing angle is narrower than the original 60°, and the 2V forward voltage is at the lower end of acceptable range.

Frequently Asked Questions (FAQ)

Q: Can TLHY6405 be used as a direct drop-in replacement for TLHY6401? A: Yes. TLHY6405 is manufactured by the same company (Vishay) and maintains identical electrical parameters (2.4V Vf, 10mA test current, 588nm wavelength) and mechanical form factor (T-1 3/4 through-hole radial, 9.00mm height). The only difference is slightly higher brightness (14mcd vs. 12mcd), which is compatible with existing designs. It has active product status, making it the preferred substitute.

Q: What is the difference between diffused and clear lens transparency? A: Diffused lenses scatter light over a wider viewing angle with lower peak brightness, while clear lenses concentrate light into a narrower viewing angle with higher peak brightness. The TLHY6401 uses a diffused lens for 60° viewing angle at 12mcd. Substitutes with clear lenses (such as HLMP-C323) will have different optical characteristics and may not be suitable for all applications.

Q: Why do some substitute parts have different test currents (20mA vs. 10mA)? A: Test current is the standard current at which brightness (millicandela) is measured. Parts tested at 20mA will have higher brightness ratings than parts tested at 10mA. When selecting a substitute with different test current, verify that the circuit can supply the required current and that the resulting brightness is acceptable for the application.

Q: Are all substitute parts RoHS3 compliant? A: Most active substitutes listed are RoHS3 compliant. TLHY6401 itself is RoHS3 compliant. When selecting a substitute, confirm RoHS3 compliance status if regulatory compliance is required for your application.

Q: Can I use a part with a different forward voltage? A: Forward voltage differences of 0.1V to 0.3V are generally acceptable in most LED indicator circuits, as they typically include current-limiting resistors. However, verify that your circuit design can accommodate the voltage variation. For example, TLHY6405 at 2.4V is a direct match, while LTL-307Y at 2.1V represents a 0.3V reduction that most circuits can tolerate.

Q: What does "T-1 3/4" mean? A: T-1 3/4 refers to the physical size of the LED lens. The "T" indicates tubular shape, and "1 3/4" refers to the diameter in eighths of an inch (1 3/4 × 1/8 = 0.21875 inches, approximately 5.5mm). This is the standard 5mm round LED package used in through-hole applications.

Q: Why is TLHY6401 listed as obsolete? A: Obsolete status indicates the manufacturer has discontinued production. TLHY6405 from the same manufacturer provides an active alternative with equivalent specifications, ensuring continued availability for new designs and replacements.

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