AY1111R-TR Yellow LED 3216 SMD Equivalent & Substitute Parts

Part Overview

The AY1111R-TR is a yellow 590nm LED indication component manufactured by Stanley Electric Co in a 1206 (3216 Metric) surface mount package with bottom entry configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The component features a diffused white lens, 2.1V forward voltage, and 3.7mcd brightness rating at 20mA test current.

Substiute Parts

AY1111R-TR

Stanley Electric CoIn Stock: 705AY1111R-TR Datasheet

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LTST-C230YKT

Lite-On Inc.In Stock: 58106LTST-C230YKT Datasheet

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SML-811WTT86

Rohm SemiconductorIn Stock: 4268SML-811WTT86 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AY1111R-TR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Yellow
• Wavelength - Dominant: 590nm (±10nm tolerance acceptable for yellow indication applications)
• Voltage - Forward (Vf): 2.1V nominal (±0.15V acceptable)
• Current - Test: 20mA nominal operation
• Package / Case: 1206 (3216 Metric) or mechanically equivalent
• Mounting Type: Surface Mount, Bottom Entry
• Lens Style: Rectangle with Flat Top

Secondary Compatibility Criteria:

• Millicandela Rating: Minimum 3.7mcd at test current
• Size / Dimension: 3.20mm L x 1.60mm W (±0.10mm acceptable)
• Height (Max): Within PCB assembly constraints (1.30mm reference)
• Moisture Sensitivity Level: MSL 4 or better

Two substitute parts meet these criteria with documented compatibility:

LTST-C230YKT (Lite-On Inc.): Matches primary criteria with identical 1206 package, 2.1V forward voltage, 20mA test current, and yellow 588nm wavelength. Active product status with superior inventory availability. Lens transparency differs (clear vs. diffused) but maintains optical function for indication applications.

SML-811WTT86 (Rohm Semiconductor): Matches primary criteria with yellow 590nm wavelength and bottom entry mounting. Package designation differs (1305/3412 Metric) with slightly smaller footprint (3.40mm L x 1.25mm W). Forward voltage 1.95V and test current 10mA represent acceptable operational variance. Active product status with established supply chain.

Parameter Comparison

Engineering Selection Recommendations

LTST-C230YKT Selection Criteria:

This substitute is recommended for direct replacement in applications where PCB layout and electrical schematic remain unchanged. The part maintains identical package footprint (1206/3216 Metric), forward voltage (2.1V), and test current (20mA) as the original AY1111R-TR. The LTST-C230YKT is active product status with ROHS3 compliance and superior moisture sensitivity rating (MSL 2A). Inventory availability exceeds 58,000 units. The clear lens transparency differs from the original diffused lens but does not affect electrical compatibility or indication function. Wavelength variance (588nm vs. 590nm) is within acceptable tolerance for yellow indication applications.

SML-811WTT86 Selection Criteria:

This substitute is applicable for applications where package footprint flexibility exists and circuit design accommodates lower forward voltage (1.95V) and reduced test current (10mA). The SML-811WTT86 offers significantly higher brightness (28mcd vs. 3.7mcd), making it suitable for applications requiring enhanced visibility. The 1305 (3412 Metric) package is mechanically smaller (3.40mm L x 1.25mm W) and lower profile (1.20mm height), enabling space-constrained designs. Active product status with ROHS3 compliance and established supply chain (4,200 units in stock). Wavelength matches the original specification at 590nm.

Compliance Considerations:

Both substitute parts carry ROHS3 compliance certification and REACH Unaffected status, matching regulatory requirements for the original component category. Moisture sensitivity levels for both substitutes exceed the original specification, providing enhanced reliability in storage and assembly environments.

Frequently Asked Questions (FAQ)

Q: Can LTST-C230YKT replace AY1111R-TR in existing PCB designs without modification?

A: Yes. The LTST-C230YKT maintains identical 1206 (3216 Metric) package dimensions (3.20mm L x 1.60mm W), forward voltage (2.1V), and test current (20mA). PCB footprint and circuit design require no changes. The clear lens differs from the original diffused lens but does not affect electrical operation or indication function.

Q: What is the primary difference between the two substitute options?

A: LTST-C230YKT provides direct package compatibility (1206/3216 Metric) with identical electrical parameters. SML-811WTT86 uses a smaller package (1305/3412 Metric) with lower forward voltage (1.95V) and reduced test current (10mA), requiring circuit design evaluation. SML-811WTT86 offers significantly higher brightness (28mcd).

Q: Does wavelength variance between 588nm and 590nm affect application performance?

A: No. Both wavelengths fall within the yellow indication spectrum. The 2nm variance between LTST-C230YKT (588nm) and the original AY1111R-TR (590nm) is imperceptible to human vision and does not affect indication function or color matching in typical applications.

Q: Are both substitute parts currently available?

A: Yes. LTST-C230YKT is active product status with 58,061 units in stock. SML-811WTT86 is active product status with 4,200 units in stock. Both parts carry ROHS3 compliance and REACH Unaffected certification.

Q: What are the moisture sensitivity implications for long-term storage?

A: LTST-C230YKT carries MSL 2A (4 weeks), providing superior moisture protection compared to the original AY1111R-TR (MSL 4, 72 hours). SML-811WTT86 carries MSL 3 (168 hours), also exceeding original specifications. Both substitutes offer enhanced reliability in storage environments.

Q: Can SML-811WTT86 be used if PCB space is limited?

A: Yes, if circuit design accommodates the different electrical parameters. SML-811WTT86 has a smaller footprint (3.40mm L x 1.25mm W vs. 3.20mm L x 1.60mm W) and lower profile (1.20mm vs. 1.30mm). However, forward voltage (1.95V) and test current (10mA) differ from the original, requiring circuit evaluation.

Q: What compliance certifications apply to the substitute parts?

A: Both LTST-C230YKT and SML-811WTT86 carry ROHS3 compliance and REACH Unaffected status. ECCN classification is EAR99 for all parts. HTSUS code is 8541.41.0000 for all parts.