TLRH4420CU Equivalent & Substitute Parts

Part Overview

The TLRH4420CU is a red diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, rated at 10V forward voltage with 10mcd brightness. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The 3mm T-1 form factor with radial leads and diffused lens provides standard indication functionality across industrial and consumer electronics.

Key Parameters

Parameter	TLRH4420CU
Manufacturer	Vishay Semiconductor Opto Division
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	10V
Millicandela Rating	10mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Dominant	619nm
Wavelength - Peak	635nm
Package / Case	Radial
Height (Max)	6.10mm
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TLRH4420CU is determined by the following critical parameters:

Voltage Rating: The main part operates at 10V forward voltage. Substitutes must accommodate this voltage requirement or be used with appropriate series resistor compensation.
Lens Size and Form Factor: All substitutes maintain the 3mm T-1 through-hole radial configuration for mechanical compatibility.
Color and Wavelength: Red color with peak wavelength in the 625–635nm range ensures optical compatibility.
Viewing Angle: 60° viewing angle is maintained across primary substitutes for consistent light distribution.
Brightness (Millicandela): The 10mcd rating establishes the baseline; substitutes range from 1.8mcd to 400mcd depending on application requirements.
Compliance: All substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Substitutes are grouped into two categories: direct voltage-matched alternatives (7.5V–12V range) and low-voltage alternatives (1.8V–2V range) requiring circuit design adjustment.

Parameter Comparison

Part Number	Manufacturer	Voltage - Forward (Vf)	Millicandela Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	RoHS Status
TLRH4420CU	Vishay Semiconductor Opto Division	10V	10mcd	60°	635nm	6.10mm	Obsolete	ROHS3 Compliant
1254-10SURD/S530-A3	Everlight Electronics Co Ltd	2V	400mcd	30°	632nm	5.30mm	Active	Not specified
3HD-F	Bivar Inc.	2V	30mcd	35°	625nm	5.30mm	Active	ROHS3 Compliant
4300F1LC	Visual Communications Company - VCC	1.8V	1.8mcd	50°	635nm	6.35mm	Not For New Designs	ROHS3 Compliant
4302F1-12V	Visual Communications Company - VCC	12V	8mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
5219215F	Dialight	7.5V	29mcd	60°	635nm	5.86mm	Active	ROHS3 Compliant
HLMP-1301-G00FG	Broadcom Limited	1.9V	8.6mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1600	Broadcom Limited	5V	2.1mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1600-D00A1	Broadcom Limited	5V	2.1mcd	60°	635nm	Not specified	Active	ROHS3 Compliant
HLMP-1600-D00A2	Broadcom Limited	5V	2.1mcd	60°	635nm	Not specified	Active	ROHS3 Compliant
HLMP-1601	Broadcom Limited	12V	2.1mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Voltage Substitutes (10V–12V Range)

The 4302F1-12V (VCC) and HLMP-1601 (Broadcom) are the closest electrical matches, operating at 12V with 60° viewing angle and 635nm peak wavelength. Both are active products with ROHS3 compliance. The 4302F1-12V provides 8mcd brightness, closely matching the original 10mcd specification. The HLMP-1601 delivers 2.1mcd, suitable for applications where lower brightness is acceptable. Both maintain the T-1 form factor and radial package configuration.

Mid-Range Voltage Substitutes (5V–7.5V Range)

The 5219215F (Dialight) operates at 7.5V with 29mcd brightness and 60° viewing angle, providing a moderate voltage step-down while maintaining comparable brightness. The HLMP-1600 series (Broadcom) operates at 5V with 2.1mcd brightness and is available in standard radial (HLMP-1600) and right-angle configurations (HLMP-1600-D00A1, HLMP-1600-D00A2). All are active products with full ROHS3 compliance.

Low-Voltage Substitutes (1.8V–2V Range)

The 3HD-F (Bivar), 1254-10SURD/S530-A3 (Everlight), and HLMP-1301-G00FG (Broadcom) operate at 1.8V–2V and require circuit redesign with appropriate series resistor compensation. The 3HD-F provides 30mcd brightness with 35° viewing angle. The 1254-10SURD/S530-A3 delivers 400mcd with a narrower 30° viewing angle. The HLMP-1301-G00FG provides 8.6mcd with 60° viewing angle. All are active products except 4300F1LC (VCC), which is marked "Not For New Designs" and should be avoided for new applications.

Compliance and Availability

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage environments. Active product status ensures ongoing availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the HLMP-1600 (5V) directly replace the TLRH4420CU (10V)?

A: Direct replacement is not recommended without circuit modification. The HLMP-1600 operates at 5V, requiring a different series resistor value to maintain proper current limiting. However, the mechanical form factor (3mm T-1 radial) and optical characteristics (60° viewing angle, 635nm peak wavelength) are compatible. Circuit redesign is necessary.

Q: What is the difference between the HLMP-1600, HLMP-1600-D00A1, and HLMP-1600-D00A2?

A: All three share identical electrical specifications (5V, 2.1mcd, 60° viewing angle, 635nm peak wavelength). The HLMP-1600 is a standard radial through-hole configuration. The HLMP-1600-D00A1 and HLMP-1600-D00A2 are right-angle through-hole variants designed for circuit board mounting perpendicular to the PCB surface. Select based on mechanical mounting requirements.

Q: Why does the 1254-10SURD/S530-A3 have 400mcd while the original is only 10mcd?

A: The 1254-10SURD/S530-A3 is a high-brightness variant with a narrower 30° viewing angle compared to the original 60° angle. Higher millicandela ratings concentrate light output into a smaller viewing cone. Application requirements determine whether increased brightness is beneficial or requires optical diffusion adjustment.

Q: Is the 4300F1LC (VCC) suitable for new designs?

A: No. The 4300F1LC is marked "Not For New Designs" and should be used only for legacy system maintenance. For new applications, select from active products such as the 4302F1-12V, 5219215F, HLMP-1600 series, or HLMP-1301-G00FG.

Q: What is the viewing angle impact on substitution?

A: The original TLRH4420CU has a 60° viewing angle. Substitutes with narrower angles (30°–35°) concentrate light output, requiring closer observation points. Substitutes with wider angles (50°–60°) maintain or improve light distribution. Select based on application visibility requirements.

Q: Are all substitutes ROHS3 compliant?

A: All recommended active substitutes are ROHS3 compliant. The 1254-10SURD/S530-A3 (Everlight) does not specify RoHS status in the provided data. Verify compliance documentation with the supplier before procurement for regulated applications.

Q: Can low-voltage substitutes (1.8V–2V) be used in a 10V circuit?

A: No. Low-voltage LEDs will fail or be damaged in a 10V circuit without significant circuit modification. A series resistor must be recalculated to limit current appropriately for the lower forward voltage. This requires engineering review and validation.

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