TLHY5201 Equivalent & Substitute Parts

Part Overview

The TLHY5201 is a yellow diffused T-1 3/4 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 588nm and a forward voltage of 2.4V at 10mA test current. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain compatibility with the original electrical characteristics, mechanical form factor, and mounting requirements while meeting current RoHS3 and REACH compliance standards.

Key Parameters

Parameter	TLHY5201 Specification
Color	Yellow
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Wavelength - Dominant	588nm
Millicandela Rating	40mcd
Mounting Type	Through Hole
Package / Case	Radial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Requirements:

Color: Yellow (exact match required)
Lens Size: 5mm, T-1 3/4 (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial (exact match required)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)

Secondary Electrical Parameters (allowable variance):

Voltage - Forward (Vf): 2.0V to 2.4V range acceptable
Current - Test: 10mA to 20mA acceptable
Wavelength - Dominant: 585nm to 590nm acceptable (yellow spectrum)
Millicandela Rating: 3.6mcd to 300mcd (application-dependent selection)

Lens Transparency Consideration: The TLHY5201 features diffused lens transparency. Substitute parts with clear lens transparency are listed but represent a functional change in light distribution characteristics and should be selected only when optical requirements permit.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Vf (Typ)	Current - Test	Wavelength - Dominant	Millicandela	Viewing Angle	Height (Max)	Product Status
TLHY5201	Vishay Semiconductor Opto Division	Yellow	Diffused	2.4V	10mA	588nm	40mcd	28°	12.20mm	Obsolete
HLMP-3451	Broadcom Limited	Yellow	Diffused	2.0V	10mA	585nm	3.6mcd	50°	6.35mm	Active
HLMP-C315	Broadcom Limited	Yellow	Clear	2.1V	20mA	589nm	300mcd	15°	8.91mm	Active
HLMP-C323	Broadcom Limited	Yellow	Clear	2.1V	20mA	589nm	170mcd	25°	8.91mm	Active
LTL-307YE	Lite-On Inc.	Yellow	Clear	2.1V	20mA	588nm	40mcd	40°	8.60mm	Active
SLR-56DC3F	Rohm Semiconductor	Orange	Clear	2.0V	10mA	605nm	25mcd	40°	8.90mm	Active
SLR-56DCT32	Rohm Semiconductor	Orange	Clear	2.0V	10mA	605nm	25mcd	40°	8.90mm	Active
SLR-56YC3F	Rohm Semiconductor	Yellow	Clear	2.1V	10mA	587nm	25mcd	40°	8.90mm	Active
SLR-56YCT32	Rohm Semiconductor	Yellow	Clear	2.1V	10mA	587nm	25mcd	40°	8.90mm	Active
SSL-LX5093YT	Lumex Opto/Components Inc.	Yellow	Clear	2.1V	20mA	585nm	40mcd	30°	8.60mm	Active
WP63YT	Kingbright	Yellow	Clear	2.1V	20mA	588nm	70mcd	30°	6.00mm	Active

Engineering Selection Recommendations

Direct Substitutes (Yellow Diffused, Closest Electrical Match):

HLMP-3451 (Broadcom Limited) is the only active substitute maintaining diffused lens transparency. It operates at 2.0V forward voltage (0.4V lower than TLHY5201) with identical 10mA test current and comparable 585nm wavelength. The 3.6mcd brightness is significantly lower than the original 40mcd specification; this part is suitable only for applications where reduced brightness is acceptable. Product status is Active with full RoHS3 compliance.

Functional Substitutes (Yellow Clear Lens, Electrical Compatibility):

LTL-307YE (Lite-On Inc.), SSL-LX5093YT (Lumex Opto/Components Inc.), and WP63YT (Kingbright) provide yellow indication with clear lens transparency and 40mcd to 70mcd brightness ratings matching or exceeding the original specification. These parts operate at 2.1V forward voltage with 20mA test current. All three are Active products with RoHS3 compliance. Selection among these depends on viewing angle requirements: LTL-307YE provides 40° viewing angle, SSL-LX5093YT provides 30°, and WP63YT provides 30°.

HLMP-C323 (Broadcom Limited) offers 170mcd brightness at 2.1V with 25° viewing angle and clear lens, suitable for applications requiring higher brightness than the original specification.

HLMP-C315 (Broadcom Limited) provides maximum brightness at 300mcd but with narrower 15° viewing angle, suitable only for focused indication applications.

SLR-56YC3F and SLR-56YCT32 (Rohm Semiconductor, SLR-56 series) provide yellow indication at 2.1V with 25mcd brightness and 40° viewing angle. These are available in both bulk and tape & box packaging options.

Non-Compatible Parts (Color Mismatch):

SLR-56DC3F and SLR-56DCT32 (Rohm Semiconductor) are orange LEDs with 605nm wavelength and do not meet the yellow color requirement of the TLHY5201 specification.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3451 be used as a direct replacement for TLHY5201?

A: HLMP-3451 maintains the diffused lens transparency and T-1 3/4 form factor of the original part. However, the 3.6mcd brightness is significantly lower than the TLHY5201's 40mcd specification. It is suitable only if the application can tolerate reduced brightness output. The forward voltage is 0.4V lower (2.0V vs. 2.4V), which may require circuit adjustment depending on current-limiting resistor design.

Q: What is the difference between diffused and clear lens transparency?

A: Diffused lenses scatter light over a wider area with reduced peak brightness, while clear lenses concentrate light in a narrower beam with higher peak brightness. The TLHY5201 uses diffused transparency. Substitutes with clear lenses will produce different light distribution patterns and may not be suitable for applications requiring diffused light characteristics.

Q: Are the Rohm SLR-56 series parts compatible with TLHY5201?

A: SLR-56YC3F and SLR-56YCT32 are yellow LEDs with compatible electrical parameters (2.1V, 10mA test current, 587nm wavelength) and T-1 3/4 form factor. However, they feature clear lens transparency rather than diffused, and provide only 25mcd brightness compared to the original 40mcd. These parts are suitable for applications where lens transparency change is acceptable.

Q: Why are SLR-56DC3F and SLR-56DCT32 listed if they are not compatible?

A: These parts are listed in the provided substitute data but do not meet the yellow color requirement of TLHY5201. They are orange LEDs (605nm wavelength) and are not suitable replacements for yellow indication applications.

Q: What is the impact of different forward voltages on circuit design?

A: The TLHY5201 operates at 2.4V typical forward voltage. Substitutes range from 2.0V to 2.1V. If the original circuit uses a fixed current-limiting resistor, the lower forward voltage of substitute parts will result in slightly higher LED current. Circuit verification is necessary to ensure the substitute part operates within its rated current specification (typically 10mA to 20mA test current).

Q: Which substitute offers the closest brightness match to TLHY5201?

A: LTL-307YE, SSL-LX5093YT, and WP63YT all provide 40mcd to 70mcd brightness, matching or exceeding the original 40mcd specification. All three are Active products with RoHS3 compliance. Selection depends on viewing angle and lens transparency requirements for the specific application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant status, meeting current regulatory requirements for hazardous substance restrictions.

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