DC3803X LED Blue-Green 3mm Through-Hole Equivalent & Substitute Parts

Part Overview

The DC3803X is a blue-green 3mm through-hole LED manufactured by Stanley Electric Co, designed for indication applications with a dominant wavelength of 505nm and a forward voltage of 3.5V at 20mA test current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The part features a clear domed lens with 1200mcd brightness rating and a 20° viewing angle in a standard radial package configuration.

Substiute Parts

DC3803X

Stanley Electric CoIn Stock: 1008DC3803X Datasheet

Current PartRFQ

SLR343ECT3F

Rohm SemiconductorIn Stock: 948SLR343ECT3F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DC3803X is determined by the following critical parameters:

Mechanical Compatibility:

• Lens size must be 3mm or T-1 equivalent to fit standard 3mm LED mounting holes
• Mounting type must be through-hole radial configuration
• Maximum height must not exceed design envelope constraints

Optical Compatibility:

• Color classification must be blue-green
• Lens transparency must be clear (colorless)
• Dominant wavelength should fall within the blue-green spectrum (502nm–527nm range)

Electrical Compatibility:

• Forward voltage (Vf) must be within ±0.5V of the original specification to maintain circuit design validity
• Test current rating of 20mA establishes the operating point
• Brightness rating (millicandela) may vary; higher ratings provide improved visibility without circuit modification

Regulatory and Compliance:

• REACH and ECCN classifications must align with the original part
• RoHS compliance status should be verified for new designs

The SLR343ECT3F from Rohm Semiconductor meets all mechanical, optical, and electrical substitution criteria for the DC3803X.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The SLR343ECT3F is a valid substitute for the DC3803X based on the following engineering criteria:

1. Mechanical Fit: Both components use identical through-hole radial mounting with 3mm form factor. The SLR343ECT3F is 0.30mm shorter, ensuring compatibility with existing PCB layouts and mechanical enclosures.

2. Electrical Operation: The forward voltage difference of 0.2V (3.5V vs. 3.3V) is within standard design tolerance. Current-limiting resistor values calculated for the DC3803X will function correctly with the SLR343ECT3F; the lower Vf may result in slightly higher LED current, which remains within safe operating limits at 20mA test current.

3. Optical Performance: Both parts emit blue-green light with clear lenses. The wavelength difference (505nm vs. 527nm) represents a shift within the blue-green spectrum; visual appearance will be similar. The SLR343ECT3F provides 2200mcd versus 1200mcd, delivering enhanced brightness without requiring circuit redesign.

4. Viewing Angle Consideration: The SLR343ECT3F has a 40° viewing angle compared to the DC3803X's 20° angle. This wider distribution may affect applications requiring narrow-angle indication; verify that the broader light cone is acceptable for the intended use case.

5. Compliance and Availability: Both parts carry identical REACH and ECCN classifications (EAR99). The SLR343ECT3F is currently in stock (857 pcs) and carries RoHS3 compliance, making it suitable for new production and maintenance applications.

Substitution Limitations:

• If the application requires a narrow 20° viewing angle for focused indication, the 40° angle of the SLR343ECT3F may not be suitable.
• If the exact 505nm wavelength is critical for color matching in multi-LED arrays, the 527nm shift should be evaluated visually.

Frequently Asked Questions (FAQ)

Q: Can the SLR343ECT3F replace the DC3803X without circuit modification?

A: Yes. The 0.2V forward voltage difference (3.5V to 3.3V) is within standard design tolerance. Existing current-limiting resistor values will function correctly. No circuit redesign is required.

Q: What is the impact of the 22nm wavelength difference (505nm vs. 527nm)?

A: Both wavelengths fall within the blue-green spectrum. The visual appearance will be similar to the human eye. If the application requires precise color matching with other components, a side-by-side comparison is recommended, but substitution is generally acceptable for indication applications.

Q: Why does the SLR343ECT3F have a wider viewing angle (40° vs. 20°)?

A: The wider viewing angle is a characteristic of the Rohm design. This provides better visibility from off-axis positions. If the application requires a narrow, focused light cone, verify that the 40° angle meets the design requirement. For most indication applications, the wider angle is beneficial.

Q: Is the higher brightness (2200mcd vs. 1200mcd) a concern?

A: No. Higher brightness improves visibility without requiring circuit modification. The LED will operate at the same 20mA test current. If the application has brightness constraints (e.g., to avoid glare or excessive power consumption), the higher output may need evaluation, but it does not create a compatibility issue.

Q: Are both parts suitable for new production?

A: Both the DC3803X and SLR343ECT3F are classified as obsolete. The SLR343ECT3F carries RoHS3 compliance and is currently in stock (857 pcs), making it the preferred choice for new production and maintenance applications. The DC3803X should be considered end-of-life for new designs.

Q: What is the mechanical fit difference?

A: The SLR343ECT3F is 0.30mm shorter (5.60mm vs. 5.90mm). This difference is negligible for standard PCB layouts and will not affect mechanical clearance in typical applications. Both parts use identical 3mm through-hole radial mounting.

Q: Are there any regulatory differences between the two parts?

A: No. Both parts carry identical REACH and ECCN (EAR99) classifications. The SLR343ECT3F includes RoHS3 compliance certification, which is advantageous for applications subject to RoHS requirements.

Q: Can I use the SLR343ECT3F in applications where the DC3803X was previously used?

A: Yes, with the caveat regarding viewing angle. If the original application relied on the narrow 20° viewing angle for focused indication, verify that the 40° angle of the substitute is acceptable. For general indication applications, the SLR343ECT3F is a direct functional replacement.