SML-521MUWT86 Equivalent & Substitute Parts

Part Overview

The SML-521MUWT86 is a dual-color LED indicator (Green/Red) in 0605 SMD package manufactured by Rohm Semiconductor. This component features independent green and red LEDs with diffused white lens in a compact 1.50mm × 1.30mm footprint, suitable for surface mount applications requiring dual-color indication.

The SML-521MUWT86 carries a "Not For New Designs" product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production requirements for existing applications.

Substiute Parts

SML-521MUWT86

Rohm SemiconductorIn Stock: 62446SML-521MUWT86 Datasheet

Current PartRFQ

SML-522MU8WT86

Rohm SemiconductorIn Stock: 163543SML-522MU8WT86 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SML-521MUWT86 is determined by the following critical parameters:

Package Compatibility: Both parts must use 0605 (1513 Metric) SMD package with identical footprint dimensions (1.50mm L × 1.30mm W, 0.70mm max height) to ensure PCB assembly compatibility without design modification.

Optical & Mechanical Compatibility: Lens color (white), transparency (diffused), and style (rectangle with flat top) must match to maintain consistent visual indication and mechanical fit in existing enclosures.

Electrical Compatibility: Forward voltage (Vf) and test current ratings must be compatible with existing circuit designs. Color configuration must remain independent dual-color (Green/Red).

Compliance & Certification: RoHS3 compliance and MSL rating (3, 168 Hours) must be maintained for manufacturing and environmental requirements.

The SML-522MU8WT86 qualifies as a direct substitute based on these parameters, with noted differences in forward voltage for red LED and millicandela ratings.

Parameter Comparison

Engineering Selection Recommendations

The SML-522MU8WT86 is the qualified substitute for the SML-521MUWT86 based on the following engineering criteria:

Product Status Alignment: The SML-522MU8WT86 carries Active product status, ensuring continued availability and manufacturing support, whereas the SML-521MUWT86 is designated "Not For New Designs."

Package & Mechanical Compatibility: Both parts share identical 0605 (1513 Metric) SMD package specifications, footprint dimensions, and height ratings, enabling direct PCB assembly compatibility without layout modification.

Compliance Maintenance: Both parts maintain ROHS3 compliance and identical MSL rating (3, 168 Hours), satisfying manufacturing and environmental requirements.

Electrical Considerations: The red LED forward voltage differs between parts (1.9V vs. 2.2V). Circuit designs must accommodate this 0.3V increase in red LED forward voltage. Green LED forward voltage remains constant at 2.2V. Test current ratings are identical at 20mA for both colors.

Optical Performance: The SML-522MU8WT86 provides increased green LED brightness (40mcd vs. 16mcd), while red LED brightness remains unchanged (63mcd). Wavelength specifications differ slightly between peak and dominant measurements across the two parts.

Frequently Asked Questions (FAQ)

Q: Can the SML-522MU8WT86 be used as a direct replacement without PCB modification?

A: Yes. Both parts use identical 0605 (1513 Metric) SMD package with matching footprint dimensions (1.50mm L × 1.30mm W) and height (0.70mm max). No PCB layout changes are required for mechanical compatibility.

Q: What is the impact of the red LED forward voltage difference (1.9V vs. 2.2V)?

A: The SML-522MU8WT86 red LED requires 0.3V higher forward voltage than the SML-521MUWT86. Circuit designs must verify that current-limiting resistor values and power supply voltage accommodate this increase to maintain proper red LED operation and brightness.

Q: Are the lens optical properties identical between these parts?

A: Yes. Both parts feature white diffused lens with rectangle flat-top style. Lens size dimensions are nominally equivalent (1.10mm × 1.30mm vs. 1.30mm × 1.10mm), representing orientation variation rather than functional difference.

Q: Does the increased green LED brightness (40mcd vs. 16mcd) affect circuit design?

A: The SML-522MU8WT86 provides higher green LED brightness. Existing circuit designs will function correctly, but visual indication intensity will increase. If consistent brightness with original design is required, current-limiting resistor adjustment may be necessary.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the SML-521MUWT86 and SML-522MU8WT86 are ROHS3 compliant with identical MSL rating (3, 168 Hours), meeting manufacturing and environmental compliance requirements.

Q: Why is the SML-521MUWT86 marked "Not For New Designs"?

A: This designation indicates the part is in mature/end-of-life phase. The SML-522MU8WT86 (Active status) is the recommended substitute for new designs and ongoing production support.