SML312ECTT86 Equivalent & Substitute Parts

Part Overview

The SML312ECTT86 is a blue-green 527nm LED indicator in 0603 (1608 Metric) surface mount package, rated at 200mcd with a forward voltage of 3.3V at 20mA test current. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The clear lens design provides standard light transmission characteristics suitable for indication applications requiring blue-green spectral output.

Substiute Parts

SML312ECTT86

Rohm SemiconductorIn Stock: 3574SML312ECTT86 Datasheet

Current PartRFQ

SMLD12EN1WT86

Rohm SemiconductorIn Stock: 12310SMLD12EN1WT86 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SML312ECTT86 is determined by the following critical parameters:

• Package compatibility: 0603 (1608 Metric) surface mount form factor
• Wavelength alignment: 527nm dominant wavelength (green spectrum)
• Voltage compatibility: Forward voltage within acceptable circuit operating range
• Luminous intensity: Millicandela rating suitable for indication purposes
• Lens configuration: Physical dimensions and transparency characteristics
• Compliance certifications: RoHS3 and REACH status

The SMLD12EN1WT86 qualifies as a substitute based on identical package geometry, matching dominant wavelength, compatible voltage characteristics, and equivalent compliance certifications. Differences in lens color (white vs. colorless), lens transparency (diffused vs. clear), and luminous intensity (140mcd vs. 200mcd) represent acceptable trade-offs for applications where the obsolete part requires replacement.

Parameter Comparison

Engineering Selection Recommendations

The SMLD12EN1WT86 is the qualified substitute for the obsolete SML312ECTT86. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and production transitions.

Key considerations for component selection:

Forward voltage differs by 0.3V (3.3V vs. 3V). Circuit designs must accommodate this voltage tolerance within the LED drive circuit specifications.

Test current specification differs (20mA vs. 5mA). The substitute operates at lower test current, which may affect brightness perception in equivalent circuit configurations.

Luminous intensity is reduced (200mcd to 140mcd). Applications requiring specific brightness levels must account for this 30% reduction in millicandela rating.

Lens characteristics change from clear colorless to white diffused. This affects light distribution pattern and color perception, with diffused lenses providing wider viewing angles and softer light output.

Physical height is reduced (0.90mm to 0.65mm maximum), which may provide PCB layout advantages in space-constrained designs.

Active product status of the SMLD12EN1WT86 ensures long-term availability and supply chain stability compared to the obsolete SML312ECTT86.

Frequently Asked Questions (FAQ)

Q: Can the SMLD12EN1WT86 be used as a direct drop-in replacement for the SML312ECTT86?

A: The SMLD12EN1WT86 shares identical package dimensions (0603/1608 Metric) and PCB footprint, enabling mechanical compatibility. However, electrical circuit parameters must be evaluated. The 0.3V forward voltage difference and reduced test current specification require circuit validation to ensure proper LED operation and brightness levels.

Q: What is the impact of the diffused lens on light output compared to the clear lens?

A: The diffused white lens of the SMLD12EN1WT86 scatters light over a wider viewing angle compared to the clear colorless lens of the SML312ECTT86. This results in softer, more dispersed light output. Applications requiring focused, directional light may experience different visual characteristics.

Q: Does the reduced millicandela rating affect circuit design?

A: The SMLD12EN1WT86 operates at 140mcd versus the SML312ECTT86 at 200mcd. For indication applications where specific brightness is required, circuit drive current may need adjustment to achieve equivalent perceived brightness. The lower test current specification (5mA vs. 20mA) suggests the substitute is optimized for lower power operation.

Q: Are there compliance or supply chain advantages to using the SMLD12EN1WT86?

A: The SMLD12EN1WT86 maintains active product status with Rohm Semiconductor, ensuring continued availability and supply chain support. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The obsolete status of the SML312ECTT86 makes the active substitute the preferred choice for new designs.

Q: How does the reduced maximum height affect PCB layout?

A: The SMLD12EN1WT86 has a maximum height of 0.65mm compared to 0.90mm for the SML312ECTT86. This 0.25mm reduction may provide layout advantages in applications with height constraints, though both components are suitable for standard surface mount assembly processes.