LTW-2E3C4 Equivalent & Substitute Parts

Part Overview

The LTW-2E3C4 is a white LED indicator light manufactured by Lite-On Inc., featuring a clear T-1 3/4 lens with 5mm diameter and through-hole radial mounting. This part is classified as obsolete, making substitute components necessary for ongoing production and maintenance applications. The original specification calls for 3.5V forward voltage at 20mA test current with 4200mcd brightness and 15° viewing angle in a standard configuration.

Key Parameters

Parameter	LTW-2E3C4 Specification
Manufacturer	Lite-On Inc.
Color	White
Lens Transparency	Clear
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	3.5V
Current - Test	20mA
Millicandela Rating	4200mcd
Viewing Angle	15°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	8.70mm
Lens Style	Round with Domed Top
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Mounting Type: Must be through-hole radial to maintain PCB compatibility
Lens Size & Style: Must be 5mm diameter with round domed top to fit existing mechanical envelopes
Color & Lens Transparency: Must be white with clear lens for visual consistency
Voltage Range: Forward voltage must be compatible with circuit design (3.2V to 3.5V acceptable within standard LED tolerance)
Current Rating: Test current of 20mA establishes the brightness class
Package / Case: Must be radial configuration for through-hole insertion

Substitute parts are grouped into two categories based on these constraints:

Category A - Direct Mechanical & Electrical Compatibility: Parts maintaining T-1 3/4 package format with forward voltage between 3.2V and 3.5V, supporting 20mA test current, and featuring round domed clear lenses.

Category B - Alternative Brightness & Viewing Angle: Parts meeting all mechanical and electrical requirements but with different millicandela ratings or viewing angles, suitable where circuit design permits parameter variation.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Lens Size	Height (Max)	Product Status
LTW-2E3C4	Lite-On Inc.	White	3.5V	20mA	4200mcd	15°	5mm, T-1 3/4	8.70mm	Obsolete
LTW-2R3D7	Lite-On Inc.	White	3.4V	20mA	4200mcd	35°	5mm, T-1 3/4	8.70mm	Active
334-15/F1C5-1RTA	Everlight Electronics Co Ltd	White	3.2V	20mA	6750mcd	50°	5mm, T-1 3/4	8.90mm	Active
334-15/T1C3-7TVA	Everlight Electronics Co Ltd	White	3.2V	20mA	10700mcd	30°	5.00mm Dia	10.40mm	Active
334-15/X1C1-1TWA	Everlight Electronics Co Ltd	White, Warm	3.2V	20mA	12575mcd	15°	5mm, T-1 3/4	8.90mm	Active
334-15/X1C2-1UWA	Everlight Electronics Co Ltd	White, Warm	3.2V	20mA	13500mcd	20°	5mm, T-1 3/4	8.90mm	Active
OVLEW1CB9	TT Electronics/Optek Technology	White	3.2V	20mA	35000mcd	15°	5.00mm Dia	8.80mm	Active
SLX-LX5093UWC/C	Lumex Opto/Components Inc.	White	3.4V	20mA	3500mcd	40°	5mm, T-1 3/4	8.70mm	Active

Engineering Selection Recommendations

Primary Substitute - LTW-2R3D7 (Lite-On Inc.)

LTW-2R3D7 is the recommended primary substitute. It maintains identical mechanical compatibility with T-1 3/4 package format and 8.70mm height matching the original LTW-2E3C4. Forward voltage of 3.4V is within acceptable tolerance of the 3.5V specification. Both parts are manufactured by Lite-On Inc., ensuring consistent design philosophy and quality standards. LTW-2R3D7 carries active product status with RoHS3 compliance and unlimited moisture sensitivity rating. The increased viewing angle of 35° versus 15° provides broader light distribution without affecting circuit compatibility.

Secondary Substitute - SLX-LX5093UWC/C (Lumex Opto/Components Inc.)

SLX-LX5093UWC/C offers mechanical and electrical compatibility with T-1 3/4 package, 8.70mm height, and 3.4V forward voltage. Active product status with RoHS3 compliance and REACH unaffected designation. Millicandela rating of 3500mcd is closest to the original 4200mcd specification among available alternatives. Viewing angle of 40° provides increased light distribution.

Alternative Substitute - 334-15/F1C5-1RTA (Everlight Electronics Co Ltd)

334-15/F1C5-1RTA maintains T-1 3/4 package format with 3.2V forward voltage and 20mA test current. Active product status with RoHS3 compliance. Height of 8.90mm represents a 0.20mm increase from original specification. Millicandela rating of 6750mcd provides increased brightness. Viewing angle of 50° offers significantly broader light distribution. This part is suitable where circuit design accommodates the slightly increased height and higher brightness output.

Color Variant Substitutes - 334-15/X1C1-1TWA and 334-15/X1C2-1UWA (Everlight Electronics Co Ltd)

These parts feature warm white color specification versus the cool white of LTW-2E3C4. Both maintain T-1 3/4 package format, 3.2V forward voltage, and 20mA test current with active product status and RoHS3 compliance. Height of 8.90mm represents a 0.20mm increase. These substitutes are applicable only where warm white color is acceptable for the application. 334-15/X1C1-1TWA provides 15° viewing angle matching the original; 334-15/X1C2-1UWA provides 20° viewing angle.

High-Brightness Alternative - OVLEW1CB9 (TT Electronics/Optek Technology)

OVLEW1CB9 is suitable for applications requiring significantly increased brightness output at 35000mcd. Maintains 5mm diameter round domed lens with 3.2V forward voltage and 20mA test current. Height of 8.80mm is within 0.10mm of original specification. Active product status with RoHS3 compliance and REACH unaffected designation. Viewing angle of 15° matches the original specification. This part is applicable where circuit design and optical requirements permit substantially higher brightness.

Not Recommended - 334-15/T1C3-7TVA (Everlight Electronics Co Ltd)

334-15/T1C3-7TVA deviates from standard T-1 3/4 package format with 5.00mm diameter designation and 10.40mm height, representing a 1.70mm increase from the original 8.70mm specification. This dimensional change may not fit existing mechanical envelopes designed for T-1 3/4 components. While electrically compatible at 3.2V and 20mA, the mechanical incompatibility makes this part unsuitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can LTW-2R3D7 be used as a direct replacement for LTW-2E3C4?

A: Yes. LTW-2R3D7 maintains identical T-1 3/4 package format, 8.70mm height, and 20mA test current. Forward voltage of 3.4V is within standard LED tolerance of the 3.5V specification. Both parts are manufactured by Lite-On Inc. The increased viewing angle of 35° versus 15° provides broader light distribution without affecting circuit compatibility.

Q: What is the significance of forward voltage differences between 3.2V and 3.5V?

A: Forward voltage variation within this range is typical for LED components and reflects manufacturing tolerance. Circuit designs using current-limiting resistors accommodate this variation. Parts rated at 3.2V, 3.4V, or 3.5V are electrically interchangeable in standard indicator applications operating at 20mA test current.

Q: Why is 334-15/T1C3-7TVA not recommended despite being electrically compatible?

A: 334-15/T1C3-7TVA has a maximum height of 10.40mm compared to the original 8.70mm specification, representing a 1.70mm increase. This dimensional change may prevent proper fit in mechanical envelopes designed for T-1 3/4 components. Mechanical compatibility is a critical substitution criterion.

Q: Can warm white LED parts (334-15/X1C1-1TWA, 334-15/X1C2-1UWA) replace the cool white LTW-2E3C4?

A: These parts are electrically and mechanically compatible but feature warm white color versus the cool white of the original. Substitution is applicable only where warm white color is acceptable for the application. Color specification must be verified against circuit design requirements.

Q: What does RoHS3 compliance indicate for these substitute parts?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This certification is provided in the product specifications for parts with active status. Compliance information is relevant for applications subject to environmental regulations.

Q: How does millicandela rating affect substitution decisions?

A: Millicandela rating determines brightness output at the specified test current. The original LTW-2E3C4 is rated at 4200mcd. Substitute parts range from 3500mcd to 35000mcd. Selection depends on circuit design requirements and optical performance specifications. Higher brightness may require circuit design verification to ensure proper current limiting.

Q: Are all substitute parts available in the same packaging format?

A: All recommended substitute parts use radial through-hole package configuration compatible with standard PCB insertion. T-1 3/4 package format is maintained by LTW-2R3D7, 334-15/F1C5-1RTA, 334-15/X1C1-1TWA, 334-15/X1C2-1UWA, and SLX-LX5093UWC/C. 334-15/T1C3-7TVA and OVLEW1CB9 use 5.00mm diameter designation with different height specifications.

Q: What inventory considerations apply to these substitute parts?

A: LTW-2R3D7 has the highest inventory availability at 23,179 pieces. SLX-LX5093UWC/C provides 12,582 pieces. 334-15/X1C2-1UWA offers 3,629 pieces. Inventory levels should be verified at time of procurement to ensure supply continuity for production requirements.

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