SMP2-SYC LED Yellow Clear 2PLCC SMD Equivalent & Substitute Parts

Part Overview

The SMP2-SYC is a yellow 591nm LED indication component manufactured by Bivar Inc. in a 2-PLCC surface mount package. This part is classified as obsolete, making it necessary to identify equivalent and substitute components for new designs or ongoing production requirements. The SMP2-SYC delivers 180mcd brightness at 1.9V forward voltage with a 120° viewing angle, suitable for standard LED indication applications requiring yellow wavelength output.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMP2-SYC
Manufacturer	Bivar Inc.
Color	Yellow
Wavelength - Dominant	591nm
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	180mcd
Viewing Angle	120°
Mounting Type	Surface Mount
Package / Case	2-PLCC
Size / Dimension	3.20mm L x 2.80mm W
Height (Max)	2.00mm
Lens Style	Round with Flat Top
Lens Transparency	Clear
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	4 (72 Hours)

Substitute Part Grouping Explanation

Substitute parts for the SMP2-SYC are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Critical Matching Parameters:

Color: Yellow
Wavelength - Dominant: 591nm (±1nm tolerance acceptable)
Mounting Type: Surface Mount
Package / Case: 2-PLCC or equivalent SMD footprint
Viewing Angle: 120°
Lens Transparency: Clear
Current - Test: 20mA

Secondary Compatibility Parameters:

Voltage - Forward (Vf): 1.9V to 2.1V range
Millicandela Rating: 180mcd minimum
Size / Dimension: 3.20mm L x 2.80mm W (±0.1mm tolerance)
Height (Max): 2.00mm to 2.10mm

Parametric Equivalent Category: Parts matching all critical parameters with identical electrical performance and package footprint.

Similar Substitute Category: Parts with matching color, wavelength, and mounting type but with variations in forward voltage, brightness rating, or package dimensions that require circuit design verification.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Vf (Typ)	mcd Rating	Viewing Angle	Package	Size (L x W)	Height (Max)	Product Status
SMP2-SYC	Bivar Inc.	Yellow	591	1.9V	180	120°	2-PLCC	3.20 x 2.80mm	2.00mm	Obsolete
SMTL2-SYC	Bivar Inc.	Yellow	591	1.9V	180	120°	2-PLCC	3.20 x 2.80mm	2.10mm	Active
67-21/Y2C-AP2R2L/2T	Everlight Electronics Co Ltd	Yellow	590	2.0V	119	120°	2-PLCC	3.20 x 2.80mm	2.10mm	Active
67-21/Y2C-BR2T1B/2T	Everlight Electronics Co Ltd	Yellow	592	2.05V	250	120°	2-SMD, J-Lead	3.10 x 2.70mm	2.10mm	Active
67-21/YSC-FU1U2B/2T	Everlight Electronics Co Ltd	Yellow	590	2.05V	582.5	120°	2-SMD, J-Lead	3.10 x 2.70mm	2.10mm	Active
67-21/YSC-FU1V2B/2T	Everlight Electronics Co Ltd	Yellow	590	2.05V	785	120°	1411 (3528 Metric)	3.50 x 2.80mm	0.85mm	Active
AA3528SYSK/J3	Kingbright	Yellow	590	2.0V	450	120°	2-PLCC	3.20 x 2.80mm	2.10mm	Active
APED3528SYC	Kingbright	Yellow	588	2.0V	250	40°	2-SMD, No Lead	3.50 x 2.80mm	3.40mm	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

SMTL2-SYC from Bivar Inc. is the parametric equivalent for SMP2-SYC. This part maintains identical electrical specifications (1.9V forward voltage, 180mcd brightness, 591nm wavelength) and package footprint (2-PLCC, 3.20 x 2.80mm). The only dimensional variance is height (2.10mm vs. 2.00mm), which remains within acceptable PCB assembly tolerances. SMTL2-SYC is active product status with RoHS3 compliance and identical MSL rating. This part provides direct functional replacement without circuit redesign.

Active Substitute Options (Yellow Color, 120° Viewing Angle):

AA3528SYSK/J3 from Kingbright is an active substitute with matching 2-PLCC package and identical footprint dimensions. Forward voltage is 2.0V (0.1V higher than SMP2-SYC), and brightness is 450mcd (2.5x higher). This part is suitable for applications where increased brightness is acceptable or beneficial. RoHS3 compliant with MSL 3 rating.

67-21/Y2C-AP2R2L/2T from Everlight Electronics is an active substitute with 2-PLCC package and matching footprint. Forward voltage is 2.0V and brightness is 119mcd (lower than SMP2-SYC). This part is suitable for applications where lower brightness is required or where forward voltage tolerance permits 2.0V operation. RoHS3 compliant with MSL 3 rating.

Higher Brightness Alternatives (Different Package Considerations):

67-21/YSC-FU1U2B/2T and 67-21/YSC-FU1V2B/2T offer significantly higher brightness (582.5mcd and 785mcd respectively) but require different package footprints (2-SMD, J-Lead and 1411 respectively). These parts are suitable only for new designs where PCB layout can accommodate alternative package geometries.

Compliance Status:

All recommended active substitutes carry RoHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. The obsolete status of SMP2-SYC necessitates transition to active product alternatives for ongoing production.

Frequently Asked Questions (FAQ)

Q: Can SMTL2-SYC directly replace SMP2-SYC without PCB modification?

A: Yes. SMTL2-SYC is the parametric equivalent with identical electrical specifications and 2-PLCC package footprint. The height difference (2.10mm vs. 2.00mm) is within standard PCB assembly tolerances and does not require layout changes.

Q: What is the forward voltage difference between SMP2-SYC and AA3528SYSK/J3?

A: SMP2-SYC operates at 1.9V typical forward voltage, while AA3528SYSK/J3 operates at 2.0V. This 0.1V difference requires verification that the circuit current-limiting resistor can accommodate the higher voltage drop. Recalculation of series resistor value may be necessary.

Q: Why do some substitute parts have different millicandela ratings?

A: Millicandela rating depends on LED die characteristics and lens design. Parts with different mcd ratings deliver different brightness levels at the same 20mA test current. Selection should match application brightness requirements.

Q: Can APED3528SYC be used as a substitute despite different viewing angle?

A: APED3528SYC has a 40° viewing angle compared to SMP2-SYC's 120° viewing angle. This narrower viewing angle makes it unsuitable for applications requiring wide-angle indication. Additionally, the different package (2-SMD, No Lead) and height (3.40mm) require PCB redesign.

Q: What does MSL 4 (72 Hours) mean for SMP2-SYC?

A: MSL 4 indicates Moisture Sensitivity Level 4, requiring storage at ≤30% relative humidity and limiting floor life to 72 hours after moisture exposure. Most active substitutes carry MSL 3 (168 hours), providing more relaxed moisture handling requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended active substitutes (SMTL2-SYC, AA3528SYSK/J3, 67-21/Y2C-AP2R2L/2T) carry RoHS3 compliance certification. The obsolete SMP2-SYC does not have current RoHS certification status.

Q: What is the difference between 2-PLCC and 2-SMD, J-Lead packages?

A: 2-PLCC (Plastic Leaded Chip Carrier) features two leads with specific geometry. 2-SMD, J-Lead uses surface mount leads with J-shaped geometry. These packages have different footprints and require different PCB pad layouts. Direct substitution between these package types requires PCB redesign.

Q: Can I use 67-21/YSC-FU1V2B/2T as a substitute?

A: 67-21/YSC-FU1V2B/2T uses a 1411 (3528 Metric) package with significantly different dimensions (3.50 x 2.80mm footprint, 0.85mm height) compared to SMP2-SYC's 2-PLCC package. This part requires complete PCB redesign and is suitable only for new designs, not direct replacement.

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