Equivalent & Substitute Parts for AA3528ASYCK

Part Overview

The AA3528ASYCK is a yellow 590nm LED indication component manufactured by Kingbright in a 2-PLCC surface mount package. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production and maintenance applications. The component features a 2.40mm diameter round lens with flat top, 180mcd brightness rating, and 2V forward voltage at 20mA test current. Due to its obsolete status, active production alternatives with matching or superior electrical and mechanical characteristics are required for design continuity.

Key Parameters

Parameter	Value	Unit
Color	Yellow	-
Wavelength - Dominant	590	nm
Voltage - Forward (Vf) Typical	2	V
Current - Test	20	mA
Millicandela Rating	180	mcd
Lens Style	Round with Flat Top	-
Lens Size	2.40	mm Dia
Viewing Angle	120	°
Package / Case	2-PLCC	-
Mounting Type	Surface Mount	-
Size / Dimension	3.20 x 2.80	mm L x W
Height (Max)	2.10	mm
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the AA3528ASYCK is determined by strict alignment of the following critical parameters:

Primary Matching Criteria:

Color: Yellow
Wavelength - Dominant: 590nm (±1nm tolerance acceptable)
Package / Case: 2-PLCC
Mounting Type: Surface Mount
Lens Style: Round with Flat Top
Lens Size: 2.40mm Diameter
Viewing Angle: 120°
Size / Dimension: 3.20mm L x 2.80mm W

Secondary Compatibility Parameters:

Voltage - Forward (Vf): 2V nominal (range 1.9V to 2.1V acceptable for circuit compatibility)
Current - Test: 20mA (standard test condition)
Millicandela Rating: 180mcd minimum (higher ratings acceptable)
RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary criteria with identical electrical specifications) and Similar Parts (matching primary criteria with minor variations in secondary parameters such as brightness or forward voltage within acceptable engineering tolerances).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Color	Wavelength (nm)	Vf (V)	mcd Rating	Viewing Angle (°)	Height Max (mm)	Product Status	Packaging
AA3528ASYCK	Kingbright	Yellow	590	2.0	180	120	2.10	Obsolete	Tube
AA3528SYSK	Kingbright	Yellow	590	2.0	200	120	2.10	Active	Tape & Reel
LTST-B680QSKT	Lite-On Inc.	Yellow	590	2.1	785	120	1.90	Active	Tape & Reel
SML-Z14YTT86A	Rohm Semiconductor	Yellow	589	2.0	280	-	2.05	Active	Tape & Reel
SML-Z14Y4TT86	Rohm Semiconductor	Yellow	590	2.1	710	-	2.05	Active	Tape & Reel
QBLP670-Y	QT Brightek	Yellow	590	2.0	210	120	2.10	Active	Tape & Reel
XZMYK45S	SunLED	Yellow	590	2.0	198	120	1.90	Active	Tape & Reel
SML-Z14DTT86A	Rohm Semiconductor	Orange	605	1.9	280	-	2.05	Active	Tape & Reel
SML-Z14D4TT86	Rohm Semiconductor	Orange	605	2.0	710	-	2.05	Active	Tape & Reel

Engineering Selection Recommendations

Recommended Parametric Equivalents (Direct Substitution):

AA3528SYSK (Kingbright) - Identical manufacturer, same series base product number. Matches all primary electrical and mechanical parameters. Product status is Active. MSL rating improved from 4 to 3. Brightness increased from 180mcd to 200mcd. Packaging changed from tube to Tape & Reel format. This part provides the most direct replacement path with highest supply availability (18,388 pcs in stock).
QBLP670-Y (QT Brightek) - Matches all primary criteria including 590nm wavelength, 2V forward voltage, 120° viewing angle, and 2.10mm maximum height. Brightness rating of 210mcd exceeds original specification. Product status is Active. MSL rating of 3 provides improved moisture protection. Suitable for applications requiring identical optical and electrical performance.
XZMYK45S (SunLED) - Matches all primary criteria with 590nm wavelength, 2V forward voltage, 120° viewing angle, and 198mcd brightness. Product status is Active. Height reduced to 1.90mm. MSL rating of 3 provides improved moisture protection. High inventory availability (18,128 pcs in stock).

Compatible Alternatives (Secondary Substitution):

SML-Z14YTT86A (Rohm Semiconductor) - Yellow 589nm LED with 2V forward voltage and 280mcd brightness. Wavelength within acceptable tolerance. Product status is Active. Height of 2.05mm is compatible. Viewing angle specification not provided. Suitable where brightness enhancement is acceptable.
SML-Z14Y4TT86 (Rohm Semiconductor) - Yellow 590nm LED with 2.1V forward voltage and 710mcd brightness. Forward voltage increase of 0.1V requires circuit verification. Brightness significantly higher. Product status is Active. Height of 2.05mm is compatible. Suitable for applications tolerating higher brightness and slightly elevated forward voltage.
LTST-B680QSKT (Lite-On Inc.) - Yellow 590nm LED with 2.1V forward voltage and 785mcd brightness. Forward voltage increase of 0.1V requires circuit verification. Brightness significantly higher. Product status is Active. Height reduced to 1.90mm. Suitable for applications with forward voltage tolerance and brightness requirements.

Not Recommended for Direct Substitution:

Orange-colored parts (SML-Z14DTT86A, SML-Z14D4TT86) do not meet the primary color matching criterion and are listed only for reference. These parts operate at different wavelengths (605nm vs 590nm) and are not suitable substitutes for yellow indication applications.

Frequently Asked Questions (FAQ)

Q: Can AA3528SYSK be used as a direct replacement for AA3528ASYCK?

A: Yes. AA3528SYSK is a parametric equivalent from the same manufacturer (Kingbright) with identical electrical specifications (2V, 20mA, 590nm, 120° viewing angle) and mechanical dimensions (3.20 x 2.80 x 2.10mm). The primary difference is packaging format (Tape & Reel vs. tube) and slightly higher brightness (200mcd vs. 180mcd). Both are RoHS3 compliant and REACH unaffected.

Q: What is the difference between "Parametric Equivalent" and "Similar Part" classifications?

A: Parametric Equivalents match all primary electrical and mechanical specifications of the original part. Similar Parts match the primary criteria but may have variations in secondary parameters such as brightness rating, forward voltage within acceptable tolerance, or viewing angle specification. Both categories are suitable for substitution based on application requirements.

Q: Are the Rohm Semiconductor SML-Z14 series parts compatible with AA3528ASYCK?

A: The yellow variants (SML-Z14YTT86A and SML-Z14Y4TT86) are compatible with the following considerations: Both match the 590nm wavelength and 2-PLCC package. SML-Z14YTT86A operates at 2V (identical to original) with 280mcd brightness. SML-Z14Y4TT86 operates at 2.1V (0.1V higher) with 710mcd brightness. Circuit verification is required for the higher forward voltage variant. Viewing angle specification is not provided for these parts.

Q: What is the impact of packaging format change from tube to Tape & Reel?

A: Packaging format affects handling, storage, and automated assembly processes but does not impact electrical or optical performance. Tape & Reel format is standard for high-volume surface mount assembly and provides improved moisture protection through controlled MSL conditions. Tube packaging is typical for lower-volume or manual assembly applications. Selection depends on production process requirements.

Q: Can parts with higher millicandela ratings be used as substitutes?

A: Yes, provided the application circuit can accommodate the increased brightness. Higher mcd ratings indicate greater light output at the same forward voltage and test current. Circuit design must verify that increased brightness does not cause optical saturation or unintended visual effects. All recommended substitutes with higher brightness ratings maintain the same 2-PLCC package and mounting compatibility.

Q: What does MSL rating mean and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. AA3528ASYCK has MSL 4 (72 hours maximum). Most recommended substitutes have MSL 3 (168 hours maximum), providing extended shelf life and reduced risk of moisture-induced defects during storage and assembly. Higher MSL numbers indicate greater moisture sensitivity and shorter safe handling windows.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All recommended parametric equivalents and compatible alternatives listed are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of the original AA3528ASYCK component.

Q: What viewing angle specification should be used for circuit design?

A: The original AA3528ASYCK specifies 120° viewing angle. All recommended parametric equivalents (AA3528SYSK, QBLP670-Y, XZMYK45S) maintain this 120° specification. Some Rohm Semiconductor alternatives (SML-Z14YTT86A, SML-Z14Y4TT86) do not provide viewing angle specification in available data. For applications where viewing angle is critical, use parts with explicit 120° specification.

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