Equivalent & Substitute Parts for AA3528SRS Red LED 2-PLCC SMD

Part Overview

The AA3528SRS is a red LED indication component manufactured by Kingbright, featuring a 640nm dominant wavelength and 150mcd brightness rating in a 2-PLCC surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement continuity. The part operates at 1.85V forward voltage with a 20mA test current and provides a 120° viewing angle in a compact 3.20mm × 2.80mm form factor.

Due to the obsolete product status, equivalent active components from multiple manufacturers are required to ensure design flexibility and supply chain reliability.

Key Parameters

Parameter	Value	Unit
Color	Red	—
Wavelength - Dominant	640	nm
Wavelength - Peak	660	nm
Millicandela Rating	150	mcd
Voltage - Forward (Vf) Typical	1.85	V
Current - Test	20	mA
Viewing Angle	120	°
Lens Style	Round with Flat Top	—
Lens Size	2.40	mm Dia
Package / Case	2-PLCC	—
Size / Dimension	3.20 × 2.80	mm
Height (Max)	2.10	mm
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the AA3528SRS is determined by strict adherence to the following critical parameters:

Primary Compatibility Criteria:

Package type: 2-PLCC surface mount configuration
Physical dimensions: 3.20mm L × 2.80mm W footprint
Lens style: Round with flat top
Lens size: 2.40mm diameter
Viewing angle: 120°
Mounting type: Surface mount
Color: Red
Test current: 20mA

Acceptable Parameter Variance:

Wavelength - Dominant: 616nm to 640nm (red spectrum range)
Wavelength - Peak: 622nm to 660nm
Voltage - Forward (Vf): 1.85V to 2.2V (within standard LED forward voltage tolerance)
Millicandela Rating: 150mcd to 785mcd (brightness variation acceptable for indication applications)
Height (Max): 1.90mm to 2.15mm (within PCB assembly clearance tolerance)

Compliance Requirements:

RoHS3 Compliant
MSL Rating: 2 or 3 (moisture sensitivity level)
REACH Unaffected status

All substitute parts listed maintain the 2-PLCC package configuration and surface mount characteristics essential for direct PCB replacement without layout modification.

Parameter Comparison

Parameter	AA3528SRS (Main)	AA3528SURCK	LTST-B680QEKT	67-21-R7SC-T1R1S1B7E-2T8-AM	LS T676-R1S1-1-Z	VFHV1104LS-TR
Manufacturer	Kingbright	Kingbright	LITEON	Everlight Electronics	ams-OSRAM USA	Stanley Electric
Product Status	Obsolete	Active	Active	Active	Active	Active
Color	Red	Red	Red	Red	Red	Red
Wavelength - Dominant (nm)	640	630	624	630	633	616
Wavelength - Peak (nm)	660	645	631	639	645	622
Millicandela Rating (mcd)	150	350	785	168	168	170
Voltage - Forward Vf (V)	1.85	1.95	2.2	2.05	2.0	2.0
Current - Test (mA)	20	20	20	20	20	20
Viewing Angle (°)	120	120	120	120	120	120
Lens Style	Round with Flat Top	Round with Flat Top	Round with Flat Top	Round with Flat Top	Round with Flat Top	Round with Flat Top
Lens Size (mm Dia)	2.40	2.40	—	2.40	2.40	2.40
Package / Case	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC
Size / Dimension (mm)	3.20 × 2.80	3.20 × 2.80	3.20 × 2.80	3.20 × 2.80	3.20 × 2.80	3.20 × 2.80
Height (Max) (mm)	2.10	2.15	1.90	2.10	2.10	2.10
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	2 (1 Year)	2A (4 Weeks)
Inventory Status	784 Pcs New Original	7378 Pcs New Original	4800 Pcs New Original	650 Pcs New Original	46014 Pcs New Original	1043 Pcs New Original

Engineering Selection Recommendations

Primary Substitute - AA3528SURCK (Kingbright): AA3528SURCK is the manufacturer-recommended substitute, maintaining Kingbright product lineage with active product status. This component provides identical mechanical compatibility with 3.20mm × 2.80mm footprint and 2-PLCC package configuration. Forward voltage increases from 1.85V to 1.95V, representing a 5.4% variance within acceptable LED tolerance ranges. Brightness increases to 350mcd, suitable for applications requiring enhanced visibility. Wavelength shift from 640nm to 630nm remains within the red spectrum range. MSL rating of 3 (168 Hours) matches the original specification. Inventory availability of 7378 units ensures procurement continuity.

Secondary Substitute - LS T676-R1S1-1-Z (ams-OSRAM USA): LS T676-R1S1-1-Z from the TOPLED® series offers the highest inventory availability at 46014 units. This component maintains full mechanical and electrical compatibility with identical 3.20mm × 2.80mm dimensions and 2-PLCC package. Forward voltage of 2.0V represents a 8.1% increase from the original 1.85V specification, within standard LED operating tolerance. Wavelength-dominant of 633nm aligns closely with the original 640nm specification. MSL rating improves to 2 (1 Year), providing superior moisture protection. This option is optimal for high-volume procurement requirements.

Tertiary Substitute - VFHV1104LS-TR (Stanley Electric): VFHV1104LS-TR from the 1104LS series maintains complete dimensional and package compatibility. Forward voltage of 2.0V and millicandela rating of 170mcd closely match the original electrical characteristics. Wavelength-dominant of 616nm represents the lowest wavelength in the substitute group, shifting toward the orange-red spectrum boundary. MSL rating of 2A (4 Weeks) provides enhanced moisture sensitivity protection. Inventory of 1043 units supports moderate-volume applications.

Alternative Substitute - LTST-B680QEKT (LITEON): LTST-B680QEKT provides the highest brightness rating at 785mcd, suitable for applications requiring maximum luminous intensity. Forward voltage of 2.2V represents the maximum variance at 18.9% above the original specification, requiring circuit design verification. Wavelength-dominant of 624nm remains within acceptable red spectrum range. Height of 1.90mm is the lowest among substitutes, providing maximum PCB clearance. This option is appropriate for brightness-critical indication applications.

Parametric Equivalent - 67-21-R7SC-T1R1S1B7E-2T8-AM (Everlight Electronics): This Everlight component provides parametric equivalence with wavelength-dominant of 630nm and millicandela rating of 168mcd closely matching original specifications. Forward voltage of 2.05V represents a 10.8% increase. Inventory of 650 units supports limited-volume applications. This option is suitable for designs requiring minimal electrical parameter deviation.

All substitute components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory conformance with current environmental standards.

Frequently Asked Questions (FAQ)

Q1: Can AA3528SURCK directly replace AA3528SRS without PCB layout modification?

A: Yes. AA3528SURCK maintains identical 2-PLCC package configuration, 3.20mm × 2.80mm footprint, and 2.15mm maximum height. PCB land pattern and assembly process remain unchanged. Forward voltage increases from 1.85V to 1.95V, requiring circuit verification to confirm current-limiting resistor values remain appropriate for the application.

Q2: What is the primary difference between the AA3528SRS and its substitutes?

A: The AA3528SRS is obsolete with limited inventory (784 units). All listed substitutes are active products with significantly higher availability. Electrical parameters vary within acceptable tolerances: forward voltage ranges from 1.85V to 2.2V, and brightness ranges from 150mcd to 785mcd. All maintain the 2-PLCC package and 120° viewing angle.

Q3: Which substitute offers the closest electrical match to the original AA3528SRS?

A: The 67-21-R7SC-T1R1S1B7E-2T8-AM from Everlight Electronics provides the closest parametric match with 168mcd brightness (versus 150mcd original) and 2.05V forward voltage (versus 1.85V original). Wavelength-dominant of 630nm closely aligns with the original 640nm specification.

Q4: Is the LS T676-R1S1-1-Z suitable for high-volume production?

A: Yes. LS T676-R1S1-1-Z offers the highest inventory availability at 46014 units, making it optimal for high-volume procurement. The component maintains full mechanical compatibility and operates within acceptable electrical parameter ranges. MSL rating of 2 (1 Year) provides superior moisture protection for extended storage.

Q5: What is the impact of forward voltage variation on circuit design?

A: Forward voltage variations from 1.85V to 2.2V require verification of current-limiting resistor calculations. For a fixed supply voltage, higher forward voltage reduces LED current. Resistor values should be recalculated using Ohm's law: R = (Vsupply - Vf) / Iled. For 20mA test current, a 5V supply would require 160Ω resistor for 1.85V Vf and 140Ω for 2.2V Vf. Verify that the selected resistor maintains LED current within acceptable operating range.

Q6: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q7: What is the significance of MSL rating differences?

A: MSL (Moisture Sensitivity Level) rating indicates the maximum time a component can be exposed to ambient conditions before soldering. AA3528SRS specifies MSL 3 (168 hours). LS T676-R1S1-1-Z offers MSL 2 (1 year), providing extended shelf life. VFHV1104LS-TR specifies MSL 2A (4 weeks), requiring more stringent moisture control. Select based on storage and handling requirements.

Q8: Can LTST-B680QEKT be used in applications requiring lower brightness?

A: LTST-B680QEKT provides 785mcd brightness, significantly higher than the original 150mcd. For applications with strict brightness specifications, this component may cause excessive luminous intensity. Circuit design modifications such as reduced LED current (below 20mA test current) would be required to lower brightness output. Verify application requirements before selection.

Q9: What are the wavelength implications for color perception?

A: All substitutes maintain red color classification with wavelength-dominant ranging from 616nm to 640nm. Wavelength shifts within this range produce imperceptible color differences to human vision in indication applications. The original 640nm and substitute 630nm-633nm options appear identical in color. The 616nm option (VFHV1104LS-TR) shifts slightly toward orange-red but remains within acceptable red LED specification.

Q10: Which substitute offers the best balance of availability, cost, and performance?

A: LS T676-R1S1-1-Z provides optimal balance with 46014 units inventory availability, electrical parameters within 8% of original specifications, improved MSL rating of 2 (1 year), and active product status. AA3528SURCK offers manufacturer-recommended continuity with Kingbright product lineage and 7378 units availability. Selection depends on specific procurement volume and supply chain preferences.

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