LTL-1CHP Red Diffused LED Equivalent & Substitute Parts

Part Overview

The LTL-1CHP is a red diffused through-hole LED manufactured by Lite-On Inc., specified for red 657nm LED indication applications in discrete radial configurations. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The LTL-1CHP operates at 2.1V forward voltage with a 4.4mcd brightness rating and 60° viewing angle in a 3.10mm diameter round domed lens package.

Key Parameters

Parameter	LTL-1CHP Value
Manufacturer	Lite-On Inc.
Color	Red
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Millicandela Rating	4.4mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Dominant	657nm
Wavelength - Peak	697nm
Package / Case	Radial
Height (Max)	5.20mm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LTL-1CHP is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
Lens Style: Round with Domed Top

Secondary Electrical Compatibility Criteria:

Voltage - Forward (Vf): 1.7V to 2.1V range
Current - Test: 10mA to 20mA range
Viewing Angle: 30° to 60° range
Lens Size: 3.00mm to 3.10mm diameter

Compliance Criteria:

RoHS Status: ROHS3 Compliant
Product Status: Active or Not For New Designs (acceptable for existing production)

Substitute parts are grouped into two categories: direct Lite-On replacements (LTL1CHJDE) and cross-manufacturer alternatives from Everlight Electronics, Bivar Inc., Visual Communications Company, and Broadcom Limited. All listed substitutes maintain mechanical compatibility through identical or equivalent radial through-hole mounting and similar lens geometry.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Lens Size	Height (Max)	Wavelength - Peak	Product Status	RoHS Status
LTL-1CHP	Lite-On Inc.	2.1V	20mA	4.4mcd	60°	3.10mm	5.20mm	697nm	Obsolete	ROHS3
LTL1CHJDE	Lite-On Inc.	2V	20mA	240mcd	60°	3.10mm	6.50mm	632nm	Active	ROHS3
1254-10SURD/S530-A3	Everlight Electronics Co Ltd	2V	20mA	400mcd	30°	3.00mm	5.30mm	632nm	Active	Not specified
3HD-F	Bivar Inc.	2V	20mA	30mcd	35°	3mm, T-1	5.30mm	625nm	Active	ROHS3
3RD-F	Bivar Inc.	2.1V	20mA	2mcd	35°	3mm, T-1	5.30mm	700nm	Active	ROHS3
3SRD-F	Bivar Inc.	1.7V	20mA	40mcd	35°	3mm, T-1	5.30mm	645nm	Active	ROHS3
3SRD-S	Bivar Inc.	1.7V	20mA	40mcd	40°	3mm, T-1	4.50mm	645nm	Active	ROHS3
4300F1LC	Visual Communications Company - VCC	1.8V	2mA	1.8mcd	50°	3mm, T-1	6.35mm	635nm	Not For New Designs	ROHS3
HLMP-1301-G00FG	Broadcom Limited	1.9V	10mA	8.6mcd	60°	3mm, T-1	6.35mm	635nm	Active	ROHS3
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	3mm, T-1	6.35mm	635nm	Active	ROHS3
HLMP-1600-D00A1	Broadcom Limited	5V	10mA	2.1mcd	60°	3mm, T-1	Not specified	635nm	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: LTL1CHJDE

The LTL1CHJDE from Lite-On Inc. is the manufacturer-recommended direct replacement for the obsolete LTL-1CHP. This part maintains identical mechanical compatibility (3.10mm lens diameter, radial through-hole mounting, round domed diffused lens) and operates within the same forward voltage range (2V vs. 2.1V). The LTL1CHJDE is active product status with ROHS3 compliance. The primary difference is increased brightness (240mcd vs. 4.4mcd), which may require circuit-level current limiting adjustments in brightness-sensitive applications.

Secondary Recommendations by Application:

For applications requiring lower brightness output comparable to the original LTL-1CHP (4.4mcd range), the 3HD-F from Bivar Inc. (30mcd) or HLMP-1301-G00FG from Broadcom Limited (8.6mcd) provide closer luminous intensity matching while maintaining active product status and ROHS3 compliance. Both operate at 2V or 1.9V forward voltage respectively.

For applications with strict wavelength requirements near 657nm dominant wavelength, the 3RD-F from Bivar Inc. (700nm peak wavelength) provides the closest spectral match among active substitutes, though at significantly reduced brightness (2mcd).

For applications requiring higher brightness output, the 1254-10SURD/S530-A3 from Everlight Electronics (400mcd) or LTL1CHJDE (240mcd) are suitable, with the understanding that circuit modifications may be necessary to accommodate increased luminous intensity.

All recommended substitutes maintain ROHS3 compliance and through-hole radial mounting compatibility. The HLMP-1600 and HLMP-1600-D00A1 from Broadcom Limited operate at 5V forward voltage and are suitable only for applications where the circuit design accommodates this higher voltage specification.

Frequently Asked Questions (FAQ)

Q: Can the LTL1CHJDE directly replace the LTL-1CHP without circuit modifications?

A: The LTL1CHJDE is mechanically and electrically compatible for direct substitution in most applications. However, the significantly higher brightness rating (240mcd vs. 4.4mcd) may require adjustment of series current-limiting resistors to prevent over-brightness or excessive current draw. Verify circuit design specifications before implementation.

Q: What is the primary difference between Lite-On and Bivar substitute options?

A: The Lite-On LTL1CHJDE offers higher brightness (240mcd) and maintains the same 3.10mm lens diameter as the original. Bivar parts (3HD-F, 3RD-F, 3SRD-F, 3SRD-S) use standard T-1 3mm lens sizing and offer varied brightness levels (2mcd to 40mcd) with lower forward voltages (1.7V to 2.1V). Selection depends on brightness requirements and circuit voltage specifications.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts except the 1254-10SURD/S530-A3 from Everlight Electronics explicitly specify ROHS3 compliance. The Everlight part does not specify RoHS status in the provided data. Verify compliance requirements with your procurement specifications before selection.

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

A: The HLMP-1600 and HLMP-1600-D00A1 are mechanically compatible through-hole radial LEDs with identical lens geometry. However, these parts operate at 5V forward voltage compared to the LTL-1CHP's 2.1V specification. Use only in applications where the circuit design supports 5V LED operation. The HLMP-1600-D00A1 includes right-angle mounting, which may not be compatible with vertical through-hole PCB layouts.

Q: What viewing angle differences exist among substitutes?

A: The original LTL-1CHP specifies 60° viewing angle. Most Bivar substitutes (3HD-F, 3RD-F, 3SRD-F) provide 35° viewing angle, while 3SRD-S offers 40°. The Everlight 1254-10SURD/S530-A3 provides 30° viewing angle. Broadcom HLMP series parts maintain 60° viewing angle. Select based on application-specific visibility requirements.

Q: Why is the 4300F1LC marked "Not For New Designs"?

A: The 4300F1LC from Visual Communications Company carries "Not For New Designs" product status, indicating it is in end-of-life phase. While available inventory exists (5500 pcs), this part should be used only for legacy product support or existing production runs. For new designs, select from parts with "Active" product status.

Q: How do wavelength specifications affect substitution?

A: The LTL-1CHP specifies 657nm dominant wavelength and 697nm peak wavelength. Substitute parts range from 621nm to 700nm peak wavelength. For applications where specific wavelength is critical (color matching, sensor compatibility), verify the substitute part's wavelength specification against application requirements. The 3RD-F (700nm peak) provides the closest match to the original's 697nm specification.

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