TLHR4601 Red Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The TLHR4601 is a red diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications with a dominant wavelength of 619nm and peak wavelength of 635nm. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design requirements. The TLHR4601 operates at 2V forward voltage with a 10mA test current and delivers 4.6mcd brightness in a standard 3mm round domed lens configuration.

Key Parameters

Parameter	TLHR4601 Value
Color	Red
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Voltage - Forward (Vf) Typical	2V
Current - Test	10mA
Millicandela Rating	4.6mcd
Viewing Angle	120°
Mounting Type	Through Hole
Wavelength - Dominant	619nm
Wavelength - Peak	635nm
Height (Max)	6.10mm
Package / Case	Radial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLHR4601 is determined by strict alignment of the following critical parameters:

Color and Wavelength: Red LEDs with dominant wavelength 619nm and peak wavelength 635nm
Lens Configuration: Diffused, round with domed top, 3mm T-1 size
Electrical Characteristics: Forward voltage (Vf) 2V nominal, test current 10mA
Mechanical Compatibility: Through-hole radial package, maximum height 6.10mm
Compliance: ROHS3 compliant, MSL 1 (Unlimited)

Substitute parts are grouped into two categories:

MFR Recommended Substitutes - Parts from the same manufacturer (Vishay) with identical or closely matched electrical and mechanical parameters, offering direct replacement capability.

Parametric Equivalents - Parts from alternative manufacturers meeting the same functional and dimensional specifications, suitable for applications where manufacturer flexibility is acceptable.

Parameter Comparison

Parameter	TLHR4601	TLHR4605	TLHR4600	1254-10SURD/S530-A3	151031SS06000	3HD-F	4300F1LC	5219215F	HLMP-1301-G00FG	HLMP-1600
Manufacturer	Vishay	Vishay	Vishay	Everlight	Würth Elektronik	Bivar	VCC	Dialight	Broadcom	Broadcom
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Style	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed
Lens Size	3mm T-1	3mm T-1	3mm T-1	3.00mm	3.00mm	3mm T-1	3mm T-1	3.00mm	3mm T-1	3mm T-1
Vf Typical (V)	2.0	2.0	2.0	2.0	2.2	2.0	1.8	7.5	1.9	5.0
Current - Test (mA)	10	10	10	20	20	20	2	—	10	10
Millicandela Rating (mcd)	4.6	6	4	400	35	30	1.8	29	8.6	2.1
Viewing Angle (°)	120	120	120	30	60	35	50	60	60	60
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Wavelength - Dominant (nm)	619	619	619	624	640	—	—	625	626	626
Wavelength - Peak (nm)	635	635	635	632	650	625	635	635	635	635
Height Max (mm)	6.10	6.10	6.10	5.30	5.55	5.30	6.35	5.86	6.35	6.35
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
RoHS Status	ROHS3	ROHS3	ROHS3	—	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility)

TLHR4605 and TLHR4600 from Vishay are the primary substitutes. Both maintain identical mechanical dimensions (6.10mm height, 3mm T-1 lens), electrical characteristics (2V Vf, 10mA test current), and compliance status (ROHS3). TLHR4605 is active production status with 6mcd brightness, while TLHR4600 offers 4mcd. Both are suitable for direct PCB substitution without circuit modification.

Alternative Manufacturers (Parametric Equivalents)

HLMP-1301-G00FG (Broadcom) and 3HD-F (Bivar) provide functional equivalence with 2V forward voltage and 10mA test current, maintaining the 3mm T-1 form factor and diffused red lens. These parts are active production status and ROHS3 compliant. Viewing angle differs (60° versus 120°), which may affect application suitability depending on optical requirements.

Limited Compatibility Substitutes

Parts with significant parameter deviations require circuit evaluation:

1254-10SURD/S530-A3 (Everlight): 400mcd brightness and 20mA test current represent substantial increases; 30° viewing angle is narrower than TLHR4601
151031SS06000 (Würth): 2.2V forward voltage and 20mA test current differ from original specification
5219215F (Dialight): 7.5V forward voltage requires complete circuit redesign
HLMP-1600 (Broadcom): 5V forward voltage incompatible with 2V design intent
4300F1LC (VCC): Not for new designs status; 1.8V forward voltage and 2mA test current represent reduced performance

Compliance and Availability

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Inventory availability ranges from 811 to 10,009 pieces across active production parts, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can TLHR4605 replace TLHR4601 directly on the PCB?

A: Yes. TLHR4605 maintains identical forward voltage (2V), test current (10mA), mechanical dimensions (6.10mm height, 3mm T-1), and lens configuration (diffused, round domed). The brightness increase from 4.6mcd to 6mcd is within typical LED tolerance ranges for indication applications. No circuit modification is required.

Q: What is the primary difference between TLHR4600 and TLHR4605?

A: Both are Vishay products with identical electrical and mechanical specifications. The difference is brightness: TLHR4600 delivers 4mcd while TLHR4605 delivers 6mcd. Selection depends on application brightness requirements. TLHR4600 has higher inventory availability (9,586 pieces).

Q: Why is 1254-10SURD/S530-A3 listed as a substitute if it has 400mcd brightness?

A: This part meets the core substitution criteria: red diffused 3mm through-hole LED with 2V forward voltage and radial package. However, the 400mcd brightness and 20mA test current represent significant increases. It is suitable only for applications where higher brightness is acceptable or beneficial. Circuit current-limiting resistor values must be recalculated for 20mA operation.

Q: Can I use HLMP-1600 as a substitute?

A: HLMP-1600 is not recommended as a direct substitute. Its 5V forward voltage requires complete circuit redesign compared to the TLHR4601's 2V specification. Use only if your application circuit is designed for 5V LED operation.

Q: What does "Not For New Designs" mean for 4300F1LC?

A: This designation indicates the manufacturer no longer recommends this part for new product development. While 4300F1LC remains available (5,500 pieces in stock), it should be avoided for new designs. Prefer active production status parts like TLHR4605, TLHR4600, or HLMP-1301-G00FG.

Q: Are all substitutes ROHS3 compliant?

A: All recommended substitutes except 1254-10SURD/S530-A3 explicitly state ROHS3 compliance. The Everlight part does not list RoHS status in provided specifications. Verify RoHS compliance with the supplier if regulatory compliance is required for your application.

Q: How does viewing angle affect substitution?

A: TLHR4601 has a 120° viewing angle, providing wide light distribution. Substitutes with narrower angles (30° for 1254-10SURD, 35° for 3HD-F, 50° for 4300F1LC, 60° for others) concentrate light in a tighter cone. Select based on application requirements: wide-angle applications require 120° or 60° parts; focused indicator applications tolerate narrower angles.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. Storage and handling do not require special humidity-controlled environments. All listed substitutes maintain this rating, ensuring consistent handling requirements across alternatives.

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