LED WHITE CLEAR T/H THW3809X Equivalent & Substitute Parts

Part Overview

The THW3809X is a white LED indication component manufactured by Stanley Electric Co, designed for through-hole mounting applications. This discrete 2.9V radial LED features a 3mm T-1 round lens with flat top configuration and delivers 200mcd brightness at 5mA test current. The product is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

THW3809X

Stanley Electric CoIn Stock: 863THW3809X Datasheet

Current PartRFQ

LTW-87HD4B

Lite-On Inc.In Stock: 1117LTW-87HD4B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete THW3809X is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Color: White
• Lens Size: 3mm, T-1
• Lens Style: Round with Flat Top
• Lens Transparency: Clear
• Mounting Type: Through Hole
• Package Configuration: Radial

Secondary Compatibility Parameters:

• Forward Voltage (Vf): Operating range tolerance
• Test Current: Operating current compatibility
• Millicandela Rating: Brightness output within application tolerance
• Viewing Angle: Optical performance requirements
• Physical Height: PCB layout and mechanical fit

The LTW-87HD4B from Lite-On Inc. qualifies as a substitute based on matching primary criteria. Secondary parameters show variations that must be evaluated within specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The LTW-87HD4B is an active product substitute for the obsolete THW3809X. Both components share identical mechanical form factors (3mm T-1 radial through-hole package) and optical characteristics (white clear lens, round flat-top style).

Electrical Parameter Differences:

• Forward voltage increases from 2.9V to 3.3V (0.4V differential)
• Test current increases from 5mA to 20mA (4x increase)
• Brightness decreases from 200mcd to 140mcd (30% reduction)
• Viewing angle increases from 100° to 130°

Compliance Status: The LTW-87HD4B carries ROHS3 compliance certification and maintains EAR99 export classification matching the original part. Physical height is reduced by 0.65mm (3.95mm vs 4.60mm), providing improved PCB layout flexibility.

Selection of the LTW-87HD4B requires circuit-level validation of the increased forward voltage and current requirements. Applications with brightness-critical specifications must account for the 30% reduction in millicandela output.

Frequently Asked Questions (FAQ)

Q: Can the LTW-87HD4B directly replace the THW3809X without circuit modification?

A: Physical and mechanical compatibility is confirmed. Electrical circuit validation is required due to forward voltage increase (2.9V to 3.3V) and test current increase (5mA to 20mA). Series resistor values and power supply specifications must be reviewed.

Q: What is the impact of the 30% brightness reduction from 200mcd to 140mcd?

A: The LTW-87HD4B produces lower luminous intensity. Applications requiring specific brightness levels for visibility or indication purposes must evaluate whether 140mcd meets functional requirements. The increased viewing angle (130° vs 100°) may partially offset brightness perception in certain mounting orientations.

Q: Are there mechanical fit concerns due to the 0.65mm height difference?

A: The LTW-87HD4B is 0.65mm shorter (3.95mm vs 4.60mm). This reduction improves clearance in space-constrained PCB layouts. No mechanical interference is introduced; however, visual alignment with adjacent components may require review.

Q: What compliance certifications apply to the LTW-87HD4B?

A: The LTW-87HD4B is ROHS3 compliant and carries EAR99 export classification. Both components share identical HTSUS code 8541.41.0000 for tariff purposes.

Q: Is the LTW-87HD4B available in the same packaging format?

A: The LTW-87HD4B is supplied in bulk packaging, whereas the THW3809X packaging format is not specified. Verify packaging requirements for your procurement and assembly processes.

Q: How do the viewing angles compare functionally?

A: The LTW-87HD4B provides a wider viewing angle (130° vs 100°), allowing visibility across a broader angular range. This may be advantageous for applications where the LED is viewed from multiple angles or positions.