LTL33BCWK5AT Equivalent & Substitute Parts

Part Overview

The LTL33BCWK5AT is a cool white LED indicator manufactured by Lite-On, designed for through-hole applications in a T-1 3/4 (5mm) package. This part operates at 3.7V forward voltage with a 4800mcd brightness rating and 20° viewing angle. The product is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility with the original electrical specifications, mechanical form factor, and mounting requirements.

Key Parameters

Parameter	LTL33BCWK5AT
Manufacturer	Lite-On
Product Status	Obsolete
Color	White, Cool
Lens Transparency	Clear
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	3.7V
Current - Test	20mA
Millicandela Rating	4800mcd
Viewing Angle	20°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	8.60mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Requirements:

Lens Size: 5mm, T-1 3/4 package (mechanical fit)
Mounting Type: Through Hole (circuit board compatibility)
Lens Transparency: Clear (optical consistency)
Current - Test: 20mA (electrical operating point)
Voltage - Forward (Vf): 3.2V to 3.7V range (circuit compatibility tolerance)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (storage and handling equivalence)

Secondary Consideration:

Color: White or White, Cool (functional equivalence for indication purposes)
Millicandela Rating: Brightness within acceptable operational range for indication applications
Viewing Angle: 15° to 50° (acceptable for indication applications)

The following parts meet these substitution criteria and are listed as active alternatives to the obsolete LTL33BCWK5AT.

Parameter Comparison

Part Number	Manufacturer	Status	Color	Vf (Typ)	mcd	Viewing Angle	Height (Max)	Lens Size	Inventory
LTL33BCWK5AT	Lite-On	Obsolete	White, Cool	3.7V	4800	20°	8.60mm	5mm, T-1 3/4	856 Pcs
LTW-2R3D7	Lite-On Inc.	Active	White	3.4V	4200	35°	8.70mm	5mm, T-1 3/4	23179 Pcs
334-15/T1C3-7TVA	Everlight Electronics Co Ltd	Active	White	3.2V	10700	30°	10.40mm	5.00mm Dia	991 Pcs
334-15/X1C2-1UWA	Everlight Electronics Co Ltd	Active	White, Warm	3.2V	13500	20°	8.90mm	5mm, T-1 3/4	3629 Pcs
334-15/X1C5-6QSA	Everlight Electronics Co Ltd	Active	White, Warm	3.2V	5375	50°	10.40mm	5.00mm Dia	1099 Pcs
OVLEW1CB9	TT Electronics/Optek Technology	Active	White	3.2V	35000	15°	8.80mm	5.00mm Dia	2100 Pcs
SLX-LX5093UWC/C	Lumex Opto/Components Inc.	Active	White	3.4V	3500	40°	8.70mm	5mm, T-1 3/4	12582 Pcs
SLX-LX5093UWC/F	Lumex Opto/Components Inc.	Active	White	4.6V	5000	25°	8.70mm	5mm, T-1 3/4	677 Pcs

Engineering Selection Recommendations

Closest Electrical Match: LTW-2R3D7 and SLX-LX5093UWC/F provide the closest forward voltage alignment to the original LTL33BCWK5AT (3.4V and 4.6V respectively, versus 3.7V). Both are active products with RoHS3 compliance and unlimited moisture sensitivity rating.

Mechanical Form Factor Equivalence: LTW-2R3D7, 334-15/X1C2-1UWA, SLX-LX5093UWC/C, and SLX-LX5093UWC/F maintain the T-1 3/4 package designation with heights within 0.10mm of the original specification, ensuring direct mechanical compatibility in existing PCB layouts.

Brightness Considerations: Substitute parts range from 3500mcd to 35000mcd. The original 4800mcd specification is closely matched by SLX-LX5093UWC/F (5000mcd) and LTW-2R3D7 (4200mcd). Higher brightness alternatives (334-15/T1C3-7TVA at 10700mcd, 334-15/X1C2-1UWA at 13500mcd, OVLEW1CB9 at 35000mcd) are suitable for applications requiring increased visibility.

Compliance Status: All active substitute parts carry RoHS3 compliance and REACH Unaffected status where specified, supporting regulatory requirements for new designs and production.

Inventory Availability: SLX-LX5093UWC/C (12582 Pcs) and LTW-2R3D7 (23179 Pcs) offer the highest stock levels for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LTL33BCWK5AT with any of these substitutes without circuit modification?

A: Substitutes with forward voltages between 3.2V and 3.7V are electrically compatible with circuits designed for the original 3.7V specification. However, verify that your current-limiting resistor value accommodates the voltage difference. For example, a substitute at 3.2V will draw slightly more current through the same resistor compared to the original 3.7V part.

Q: What is the difference between T-1 3/4 and 5.00mm Dia package designations?

A: Both refer to 5mm diameter LED packages. T-1 3/4 is the standard industry designation for this form factor. The mechanical compatibility is equivalent for through-hole mounting applications.

Q: Are warm white LEDs (334-15/X1C2-1UWA, 334-15/X1C5-6QSA) suitable replacements for a cool white application?

A: Warm white and cool white LEDs have different color temperatures and are not functionally equivalent for applications requiring specific color indication. Use warm white substitutes only if the application permits color variation or if warm white is the intended replacement color.

Q: How do viewing angle differences affect substitution?

A: The original LTL33BCWK5AT has a 20° viewing angle. Substitutes with narrower angles (15°) provide more focused light output, while wider angles (25° to 50°) distribute light over a broader area. Select based on the intended viewing geometry of your application.

Q: Which substitute offers the best brightness match to the original 4800mcd?

A: SLX-LX5093UWC/F at 5000mcd provides the closest brightness match, with only 200mcd difference. LTW-2R3D7 at 4200mcd is also within acceptable tolerance for most indication applications.

Q: Are all substitutes RoHS3 compliant?

A: All active substitute parts listed carry RoHS3 compliance certification. The original obsolete part (LTL33BCWK5AT) does not have RoHS status specified.

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