TLHY4438 Yellow LED T-1 Equivalent & Substitute Parts

Part Overview

The TLHY4438 is a yellow 587nm LED indication component manufactured by Vishay Semiconductor Opto Division in a T-1 through-hole radial package. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The TLHY4438 delivers 13mcd at 2.4V forward voltage with a 60° viewing angle and diffused lens configuration.

Key Parameters

Parameter	TLHY4438 Value
Color	Yellow
Wavelength - Dominant	587nm
Wavelength - Peak	585nm
Voltage - Forward (Vf) Typical	2.4V
Current - Test	10mA
Millicandela Rating	13mcd
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Viewing Angle	60°
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 TLHY4438 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Color: Yellow
Mounting Type: Through Hole Radial
Lens Size: 3mm, T-1 form factor
Lens Transparency: Diffused
Wavelength Range: 585–591nm (yellow spectrum)
Forward Voltage: 2.0–2.4V
RoHS3 Compliance

Substitution Logic: Parts are considered equivalent when they maintain the same yellow color, T-1 through-hole radial package, diffused lens configuration, and operate within the specified voltage and wavelength parameters. Variations in millicandela rating, viewing angle, and test current are acceptable provided the application does not require the exact original specifications. Parts with different forward voltages (5V) or package configurations are listed for reference but require circuit redesign considerations.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength - Dominant (nm)	Vf Typical (V)	Current - Test (mA)	Millicandela Rating (mcd)	Lens Transparency	Viewing Angle (°)	Lens Size	Height Max (mm)	Product Status
TLHY4438	Vishay Semiconductor Opto Division	Yellow	587	2.4	10	13	Diffused	60	3mm, T-1	6.10	Obsolete
TLHY4205	Vishay Semiconductor Opto Division	Yellow	588	2.4	10	20	Clear	44	3mm, T-1	6.10	Active
1254-10UYD/S530-A3	Everlight Electronics Co Ltd	Yellow	589	2.0	20	200	Diffused	30	3.00mm Dia	5.20	Active
264-7UYD/S530-A3	Everlight Electronics Co Ltd	Yellow	589	2.0	20	125	Diffused	60	2.90mm Dia	6.20	Active
3YD-F	Bivar Inc.	Yellow	—	2.0	20	20	Diffused	35	3mm, T-1	5.30	Active
414-10UYD/S530-A3	Everlight Electronics Co Ltd	Yellow	589	2.0	20	40	Diffused	120	3.00mm Dia	7.00	Active
HLMP-1401	Broadcom Limited	Yellow	585	2.0	10	2.2	Diffused	60	3mm, T-1	6.35	Active
HLMP-1401-D0002	Broadcom Limited	Yellow	585	2.0	10	3.6	Diffused	60	3mm, T-1	6.35	Active
HLMP-1401-E0000	Broadcom Limited	Yellow	585	2.0	10	5.7	Diffused	60	3mm, T-1	6.35	Active
HLMP-1620	Broadcom Limited	Yellow	585	5.0	10	2.2	Diffused	60	3mm, T-1	6.35	Active
HLMP-1620-C00A1	Broadcom Limited	Yellow	583	5.0	10	2.2	Diffused, Tinted	60	3mm, T-1	—	Active

Engineering Selection Recommendations

Direct Substitutes (No Circuit Modification Required):

The HLMP-1401 series (HLMP-1401, HLMP-1401-D0002, HLMP-1401-E0000) from Broadcom Limited provides the closest functional match to the TLHY4438. These parts maintain identical T-1 form factor, diffused lens configuration, 60° viewing angle, and 2.0V forward voltage operation. All variants are ROHS3 compliant with unlimited moisture sensitivity rating. The primary difference is reduced millicandela output (2.2–5.7mcd versus 13mcd), which is acceptable for indicator applications where brightness is not critical. These parts are in active production with substantial inventory availability.

Secondary Substitutes (Voltage-Compatible, Parameter Variations):

The 264-7UYD/S530-A3 from Everlight Electronics operates at 2.0V forward voltage with diffused lens and 60° viewing angle, matching the TLHY4438 viewing angle specification. This part delivers 125mcd at 20mA test current, providing higher brightness for applications requiring increased visibility. The 3.0mm T-1 package maintains mechanical compatibility with standard through-hole PCB layouts.

The 3YD-F from Bivar Inc. is a T-1 diffused yellow LED operating at 2.0V with 20mcd output. This part maintains the original form factor and diffused lens transparency, making it suitable for direct board-level substitution in applications where the exact millicandela rating is not critical.

Alternative Substitutes (Circuit Redesign Required):

The HLMP-1620 and HLMP-1620-C00A1 from Broadcom Limited operate at 5.0V forward voltage and require series resistor recalculation for existing 2.4V circuits. These parts are listed for reference in applications where 5V supply voltage is available or where circuit redesign is feasible.

The 414-10UYD/S530-A3 from Everlight Electronics features a flat-top lens and 120° viewing angle, differing from the original domed-top configuration. This part is suitable for wide-angle indication applications but requires mechanical verification for PCB clearance due to its 7.00mm maximum height.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original TLHY4438 environmental specifications. All parts carry EAR99 ECCN classification and are REACH unaffected, ensuring regulatory consistency with the original component.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-1401 as a direct replacement for TLHY4438 without modifying my circuit?

A: Yes. The HLMP-1401 operates at 2.0V forward voltage compared to the TLHY4438's 2.4V, but both are compatible with standard LED current-limiting resistor designs. The primary difference is reduced brightness (2.2mcd versus 13mcd). If your application requires the original brightness level, verify that the lower output is acceptable for your indicator function.

Q: What is the difference between TLHY4205 and TLHY4438?

A: Both are Vishay yellow LEDs in T-1 packages operating at 2.4V. The TLHY4205 features a clear lens with 44° viewing angle and 20mcd output, while the TLHY4438 has a diffused lens with 60° viewing angle and 13mcd output. The TLHY4205 is active production, making it a viable alternative if clear lens transparency is acceptable for your application.

Q: Can I use the Everlight 1254-10UYD/S530-A3 in place of TLHY4438?

A: Yes, with brightness considerations. The 1254-10UYD/S530-A3 operates at 2.0V with 200mcd output—significantly brighter than the original 13mcd. This part is suitable for applications requiring high-visibility indication. The 30° viewing angle is narrower than the original 60°, so verify that your application does not require wide-angle visibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory consistency with the original TLHY4438.

Q: What is the difference between HLMP-1401 and HLMP-1620?

A: Both are Broadcom yellow diffused T-1 LEDs with identical form factor and 60° viewing angle. The primary difference is forward voltage: HLMP-1401 operates at 2.0V, while HLMP-1620 operates at 5.0V. Select HLMP-1401 for 2.0–2.4V circuits and HLMP-1620 for 5.0V circuits. Both deliver 2.2mcd output.

Q: Does the 414-10UYD/S530-A3 have a different physical shape than TLHY4438?

A: Yes. The 414-10UYD/S530-A3 features a flat-top lens compared to the TLHY4438's domed-top configuration. The flat-top design may affect light distribution and viewing angle (120° versus 60°). Verify mechanical clearance and optical performance before substitution.

Q: Can I use HLMP-1620-C00A1 in a 2.4V circuit?

A: No. The HLMP-1620-C00A1 is rated for 5.0V operation and is not suitable for 2.4V circuits without circuit redesign. This part is listed for reference in applications where 5V supply voltage is available.

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