SML-310LTT86 Equivalent & Substitute Parts

Part Overview

The SML-310LTT86 is a red LED indicator in 0603 (1608 Metric) surface mount package manufactured by Rohm Semiconductor. This part operates at 1.75V forward voltage with 16mcd brightness and features a clear lens for direct light transmission. The product is classified as Not For New Designs, making identification of equivalent alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain compatibility across package dimensions, mounting type, and electrical performance within acceptable operating parameters.

Substiute Parts

SML-310LTT86

Rohm SemiconductorIn Stock: 44640SML-310LTT86 Datasheet

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SML-D12V1WT86

Rohm SemiconductorIn Stock: 4174SML-D12V1WT86 Datasheet

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SML-D12V8WT86

Rohm SemiconductorIn Stock: 90361SML-D12V8WT86 Datasheet

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SML-LXFM0603SRC-TR

Lumex Opto/Components Inc.In Stock: 5189SML-LXFM0603SRC-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SML-310LTT86 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 0603 (1608 Metric) surface mount package with identical footprint dimensions (1.60mm L x 0.80mm W) to ensure PCB layout compatibility.

Electrical Parameters: Forward voltage (Vf) and test current must remain within acceptable circuit design tolerances. The primary part operates at 1.75V; substitutes with 1.7V to 2.2V forward voltage are acceptable for most indicator applications where voltage drop variations can be accommodated by series resistor adjustment.

Optical Characteristics: Red color (wavelength 630nm to 660nm) and lens transparency (clear or diffused) determine visual performance. Clear lens parts maintain direct light transmission; diffused lens parts provide wider viewing angles with reduced peak brightness.

Mechanical Fit: Height and lens dimensions must not exceed PCB clearance constraints. The primary part height is 0.90mm maximum; substitute parts with 0.65mm to 1.10mm height remain compatible with standard PCB assembly processes.

Compliance & Status: All parts must maintain ROHS3 compliance and current or active product status to ensure supply chain availability and regulatory adherence.

Parameter Comparison

Engineering Selection Recommendations

SML-D12V1WT86 and SML-D12V8WT86: Both parts are manufactured by Rohm Semiconductor with Active product status, ensuring long-term supply availability. These substitutes feature diffused white lenses that provide wider viewing angles compared to the clear lens of the primary part. Forward voltage increases to 2.2V, requiring series resistor recalculation in the indicator circuit. Brightness increases to 40mcd, providing enhanced visibility. Height reduction to 0.65mm improves PCB clearance margins. The primary difference between these two is packaging: SML-D12V1WT86 uses Tape & Reel (TR), while SML-D12V8WT86 uses Cut Tape (CT) & Digi-Reel®. Both maintain ROHS3 compliance and identical electrical performance.

SML-LXFM0603SRC-TR: Manufactured by Lumex Opto/Components Inc. with Active product status. This substitute maintains clear lens transparency and 660nm wavelength matching the primary part, minimizing optical behavior changes. Forward voltage of 1.7V closely matches the original 1.75V, reducing circuit redesign requirements. Brightness increases significantly to 100mcd with 120° viewing angle specification. Height of 1.10mm exceeds the primary part by 0.20mm; verify PCB clearance before selection. Tape & Reel packaging matches the primary part format.

Selection Criteria: For applications requiring minimal circuit modification, select SML-LXFM0603SRC-TR due to voltage and optical similarity. For applications where increased brightness and wider viewing angles are acceptable, select SML-D12V1WT86 or SML-D12V8WT86 based on packaging requirements. All substitutes maintain ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can SML-D12V1WT86 and SML-D12V8WT86 be used interchangeably with SML-310LTT86?

A: Yes, both parts are electrically and mechanically compatible. The primary differences are packaging format (Tape & Reel versus Cut Tape & Digi-Reel®) and forward voltage (2.2V versus 1.75V). Circuit resistor values must be recalculated to accommodate the higher forward voltage. Diffused lens transparency provides wider viewing angles at the cost of reduced peak brightness in the direct viewing direction.

Q: What is the impact of forward voltage differences on circuit design?

A: Forward voltage differences directly affect series resistor calculations. The SML-310LTT86 operates at 1.75V; SML-D12V1WT86 and SML-D12V8WT86 operate at 2.2V; SML-LXFM0603SRC-TR operates at 1.7V. For a given supply voltage and target LED current, higher forward voltage reduces the voltage drop across the series resistor, requiring a lower resistance value. Recalculate using Ohm's Law: R = (Vsupply - Vf) / Iled.

Q: Does lens transparency affect circuit performance?

A: Lens transparency affects optical performance only, not electrical circuit behavior. Clear lenses transmit light directly with minimal scattering; diffused lenses scatter light to provide wider viewing angles. Both types operate identically from an electrical standpoint. Selection depends on application requirements for viewing angle and brightness distribution.

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

A: No. SML-310LTT86 and SML-LXFM0603SRC-TR are available in Tape & Reel (TR) packaging. SML-D12V1WT86 is available in Tape & Reel (TR). SML-D12V8WT86 is available in Cut Tape (CT) & Digi-Reel®. Verify packaging availability with your supplier before finalizing part selection.

Q: What is the significance of the "Not For New Designs" status on the primary part?

A: This status indicates the SML-310LTT86 is in end-of-life phase and not recommended for new product development. Existing inventory remains available for maintenance and legacy system support. For new designs, select from the Active status substitutes: SML-D12V1WT86, SML-D12V8WT86, or SML-LXFM0603SRC-TR.

Q: Do all parts meet the same compliance standards?

A: Yes. All parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. ECCN classification (EAR99) and HTSUS code (8541.41.0000) are identical across all parts.