LTL2R3SEK Equivalent & Substitute Parts

Part Overview

The LTL2R3SEK is a red LED indication component manufactured by Lite-On Inc., designed for through-hole mounting applications. This part operates at 2.25V forward voltage with a 3700mcd brightness rating and features a 5mm T-1 3/4 clear lens with 30° viewing angle. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	LTL2R3SEK Value
Color	Red
Lens Transparency	Clear
Lens Size	5mm, T-1 3/4
Mounting Type	Through Hole
Voltage - Forward (Vf) (Typ)	2.25V
Current - Test	20mA
Millicandela Rating	3700mcd
Viewing Angle	30°
Wavelength - Dominant	630nm
Package / Case	Radial
Height (Max)	8.70mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LTL2R3SEK is determined by the following criteria:

Primary Compatibility Requirements:

Color: Red
Lens Transparency: Clear
Mounting Type: Through Hole
Package / Case: Radial
Current - Test: 20mA

Secondary Compatibility Parameters:

Voltage - Forward (Vf): Range 1.9V to 2.25V
Lens Size: 5mm or T-1 3/4 configuration
Millicandela Rating: 1600mcd minimum
Wavelength - Dominant: 624nm to 630nm
Height (Max): 8.70mm to 12.40mm
Viewing Angle: 6° to 36°

Substitute parts must maintain electrical compatibility within the forward voltage range and mechanical compatibility with through-hole radial packaging. Brightness, viewing angle, and wavelength variations are acceptable within the specified ranges for general indication applications.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd Rating	Wavelength - Dominant	Viewing Angle	Height (Max)	Lens Size	Product Status	MSL
LTL2R3SEK	Lite-On Inc.	2.25V	3700mcd	630nm	30°	8.70mm	5mm, T-1 3/4	Obsolete	1 (Unlimited)
LTL2V3EUJS	Lite-On Inc.	2.1V	4200mcd	625nm	36°	12.40mm	4.80mm Dia	Active	2A (4 Weeks)
LTL353QRKNN	Lite-On Inc.	1.9V	4200mcd	631nm	12°	8.80mm	5mm, T-1 3/4	Active	1 (Unlimited)
383-2SDRC/S530-A4	Everlight Electronics Co Ltd	2V	2780mcd	639nm	6°	8.90mm	5.00mm Dia	Active	Not specified
383-2SURC/S530-A6	Everlight Electronics Co Ltd	2V	6300mcd	624nm	6°	8.90mm	5mm, T-1 3/4	Active	Not specified
7343-2SURC/H2/S400-A6	Everlight Electronics Co Ltd	2V	1600mcd	624nm	30°	8.85mm	4.60mm Dia	Active	1 (Unlimited)
7343-2SURC/H2/S400-A7	Everlight Electronics Co Ltd	2V	1600mcd	624nm	30°	8.85mm	5mm, T-1 3/4	Active	1 (Unlimited)
7343-2SURC/H2/S400-A8	Everlight Electronics Co Ltd	2V	2000mcd	624nm	30°	8.85mm	5mm, T-1 3/4	Active	1 (Unlimited)
7383/R7C3-ARUB/P/MS	Everlight Electronics Co Ltd	2V	7150mcd	624nm	30°	9.00mm	5mm, T-1 3/4	Active	1 (Unlimited)
C503B-RCN-CW0Z0AA1	CreeLED, Inc.	2.1V	7500mcd	624nm	30°	10.30mm	5.00mm Dia	Active	1 (Unlimited)
HLMP-EG08-VY000	Broadcom Limited	1.9V	8100mcd	626nm	8°	8.91mm	5mm, T-1 3/4	Active	1 (Unlimited)

Engineering Selection Recommendations

Lite-On Inc. Substitutes: LTL2V3EUJS and LTL353QRKNN are active products from the original manufacturer. LTL353QRKNN provides the closest mechanical compatibility with 5mm T-1 3/4 lens size and MSL 1 rating. LTL2V3EUJS offers higher brightness but features a smaller lens diameter and increased height.

Everlight Electronics Co Ltd Substitutes: 7343-2SURC/H2/S400-A7 and 7343-2SURC/H2/S400-A8 provide optimal mechanical compatibility with identical T-1 3/4 lens size, MSL 1 rating, and 30° viewing angle matching the original part. 7383/R7C3-ARUB/P/MS offers the highest brightness rating at 7150mcd with the same mechanical profile. All Everlight parts are ROHS3 compliant and active products.

CreeLED, Inc. Substitute: C503B-RCN-CW0Z0AA1 provides high brightness at 7500mcd with RoHS compliance and MSL 1 rating. Height is 10.30mm, exceeding the original specification.

Broadcom Limited Substitute: HLMP-EG08-VY000 is an active product with MSL 1 rating and ROHS3 compliance. The 8° viewing angle is narrower than the original 30°, suitable for applications requiring focused illumination.

Frequently Asked Questions (FAQ)

Q: Can LTL2V3EUJS directly replace LTL2R3SEK? A: LTL2V3EUJS is electrically compatible within the 20mA test current specification. However, the lens diameter is 4.80mm versus the original 5mm, and maximum height is 12.40mm versus 8.70mm. Physical fit in the PCB layout must be verified.

Q: Which substitute offers the closest mechanical match? A: 7343-2SURC/H2/S400-A7 and LTL353QRKNN both feature 5mm T-1 3/4 lens size with heights of 8.85mm and 8.80mm respectively, closest to the original 8.70mm specification.

Q: Are all substitutes RoHS compliant? A: Everlight and Broadcom parts are ROHS3 compliant. CreeLED C503B-RCN-CW0Z0AA1 is RoHS compliant. LTL2V3EUJS does not specify RoHS status in the provided data.

Q: What is the voltage tolerance range for substitution? A: Substitute parts operate between 1.9V and 2.1V forward voltage, compared to the original 2.25V. Circuit designs must accommodate this lower voltage range.

Q: How do viewing angles affect substitution? A: The original part features 30° viewing angle. Substitutes range from 6° to 36°. Narrower angles concentrate light intensity; wider angles distribute it. Application requirements determine acceptability.

Q: What is the significance of MSL ratings? A: The original part has MSL 1 (unlimited moisture exposure). LTL2V3EUJS has MSL 2A (4 weeks maximum). Storage and handling procedures must align with the selected substitute's MSL classification.

Q: Can brightness differences affect circuit operation? A: Brightness ratings range from 1600mcd to 8100mcd across substitutes. Higher brightness may require current limiting resistor adjustment. Lower brightness may reduce visibility. Application requirements determine acceptability.

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