TLHY4205 Yellow LED T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The TLHY4205 is a yellow 588nm LED indication component manufactured by Vishay Semiconductor Opto Division. This T-1 through-hole radial LED operates at 2.4V forward voltage with a 20mcd brightness rating and 44° viewing angle. The component is Active status and ROHS3 compliant. Equivalent and substitute parts are identified when applications require alternative sourcing due to inventory constraints, lead time considerations, or specific parameter requirements within acceptable tolerance ranges for yellow and orange LED indication circuits.

Key Parameters

Parameter	TLHY4205 Value
Color	Yellow
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Voltage - Forward (Vf) Typical	2.4V
Current - Test	10mA
Millicandela Rating	20mcd
Viewing Angle	44°
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Lens Transparency	Clear
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLHY4205 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Color: Yellow (588nm dominant wavelength range 585-590nm)
Lens Size: 3mm T-1 form factor
Mounting Type: Through Hole Radial
Lens Transparency: Clear
Lens Style: Round with Domed Top
Forward Voltage Range: 2.0V to 2.4V
Test Current: 10mA to 20mA
RoHS3 Compliance: Required

Group 1 - Direct Yellow LED Substitutes (588nm Wavelength): Parts matching yellow color specification with 588nm dominant wavelength: WP710A10YT, LTL-4252N

Group 2 - Yellow LED Substitutes (585-587nm Wavelength): Parts with yellow color and peak wavelength within acceptable yellow spectrum: HLMP-1420, HLMP-1421, SLR-332YC3F, SSL-LX3044YT

Group 3 - Alternative Yellow LED (3mm Package): Yellow LED with different package dimensions but compatible electrical characteristics: 5219431F

Group 4 - Orange LED Substitutes (602-605nm Wavelength): Parts with orange color specification for applications where color shift is acceptable: HLMP-Y402-G0000, WP132XNT, WP710A10NT

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength - Dominant (nm)	Wavelength - Peak (nm)	Vf Typical (V)	Current - Test (mA)	Millicandela (mcd)	Viewing Angle (°)	Lens Size	Height Max (mm)	RoHS Status
TLHY4205	Vishay Semiconductor Opto Division	Yellow	588	585	2.4	10	20	44	3mm, T-1	6.10	ROHS3 Compliant
5219431F	Dialight	Yellow	—	—	—	20	30	—	2.90mm Dia	5.89	ROHS3 Compliant
HLMP-1420	Broadcom Limited	Yellow	585	583	2.0	10	15	45	3mm, T-1	6.35	ROHS3 Compliant
HLMP-1421	Broadcom Limited	Yellow	585	583	2.0	10	15	45	3mm, T-1	6.35	ROHS3 Compliant
HLMP-Y402-G0000	Broadcom Limited	Orange	605	610	2.1	20	29	45	3mm, T-1	5.20	ROHS3 Compliant
LTL-4252N	Lite-On Inc.	Yellow	588	585	2.1	10	19	45	3mm, T-1	5.85	ROHS3 Compliant
SLR-332YC3F	Rohm Semiconductor	Yellow	587	—	2.1	10	10	85	3.20mm Dia	4.60	ROHS3 Compliant
SSL-LX3044YT	Lumex Opto/Components Inc.	Yellow	—	585	2.1	20	90	30	3mm, T-1	4.60	ROHS3 Compliant
WP132XNT	Kingbright	Orange	602	607	2.05	20	20	50	3mm, T-1	5.20	ROHS3 Compliant
WP710A10NT	Kingbright	Orange	602	607	2.05	20	30	34	3mm, T-1	5.90	ROHS3 Compliant
WP710A10YT	Kingbright	Yellow	588	590	2.1	20	30	34	3mm, T-1	5.90	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Yellow LED Substitution (Preferred): LTL-4252N and WP710A10YT maintain yellow color specification with 588nm dominant wavelength matching the TLHY4205. Both are Active status products with ROHS3 compliance. LTL-4252N operates at 2.1V forward voltage with 19mcd brightness at 10mA test current, providing closest electrical alignment. WP710A10YT operates at 2.1V with 30mcd brightness but requires 20mA test current.

For Yellow LED Substitution with Wavelength Tolerance: HLMP-1420 and HLMP-1421 (Broadcom) provide yellow indication with 585nm peak wavelength within acceptable yellow spectrum. Both operate at 2.0V forward voltage with 15mcd brightness at 10mA test current. These parts offer lower forward voltage operation suitable for reduced power applications. SSL-LX3044YT (Lumex) provides 90mcd brightness at 2.1V and 20mA test current for high-brightness applications, though with narrower 30° viewing angle.

For Alternative Package Consideration: 5219431F (Dialight) provides yellow LED indication in 3mm package with 30mcd brightness at 20mA test current. Forward voltage specification is not provided; circuit design verification is required before selection.

For Orange LED Substitution (Color Shift Application): HLMP-Y402-G0000, WP132XNT, and WP710A10NT provide orange indication (602-605nm wavelength) with forward voltages between 2.05V and 2.1V. These parts are suitable only for applications where orange color substitution is functionally acceptable. All maintain T-1 3mm form factor and through-hole radial mounting.

All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating consistent with the TLHY4205.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1420 or HLMP-1421 directly replace TLHY4205 in existing circuits? A: HLMP-1420 and HLMP-1421 operate at 2.0V forward voltage compared to TLHY4205 at 2.4V. Circuit current-limiting resistor values must be recalculated to maintain proper LED current at the lower forward voltage. Both parts provide yellow indication with 585nm peak wavelength within acceptable tolerance. Brightness is 15mcd versus 20mcd for the TLHY4205.

Q: What is the difference between WP710A10YT and LTL-4252N? A: Both provide yellow 588nm LED indication at 2.1V forward voltage. WP710A10YT requires 20mA test current with 30mcd brightness and 34° viewing angle. LTL-4252N operates at 10mA test current with 19mcd brightness and 45° viewing angle. Selection depends on circuit current budget and required brightness level.

Q: Can orange LED parts (WP710A10NT, HLMP-Y402-G0000, WP132XNT) substitute for yellow TLHY4205? A: Orange LEDs operate at different wavelengths (602-605nm) and produce orange light instead of yellow. These parts are functionally equivalent only in applications where color change is acceptable. Forward voltages range from 2.05V to 2.1V, requiring circuit resistor recalculation.

Q: Why does SSL-LX3044YT have a narrower viewing angle (30°) than TLHY4205 (44°)? A: SSL-LX3044YT provides 90mcd brightness at 2.1V and 20mA test current, significantly higher than TLHY4205 at 20mcd. The narrower 30° viewing angle is a design characteristic of high-brightness LEDs. Selection depends on application requirements for brightness versus viewing angle coverage.

Q: Are all substitute parts ROHS3 compliant? A: All substitute parts listed are ROHS3 compliant. LTL-4252N carries REACH Affected status; all other parts are REACH Unaffected. Verify REACH compliance requirements for your specific application and supply chain.

Q: What is the impact of different test currents (10mA vs 20mA) on substitution? A: Test current specification indicates the current at which brightness (millicandela) rating is measured. Parts rated at 20mA test current will operate at different brightness levels when driven at 10mA. Circuit design must account for actual operating current to achieve required brightness performance.

Q: Can 5219431F substitute for TLHY4205 despite missing forward voltage specification? A: 5219431F provides yellow indication with 30mcd brightness in 3mm package. Forward voltage is not specified in available data. Circuit verification testing is required before production use to confirm proper operation at intended supply voltage and current levels.

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