SMP2-UYC

Part Overview

The SMP2-UYC is a yellow 591nm LED indicator in 2-PLCC surface mount package manufactured by Bivar Inc. This component is currently listed as obsolete product status. Identifying suitable equivalent and substitute parts is necessary to maintain design continuity, ensure procurement availability, and support existing inventory management for systems utilizing this discrete LED indication component.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMP2-UYC
Manufacturer	Bivar Inc.
Description	LED YELLOW CLEAR 2PLCC SMD
Color	Yellow
Wavelength - Dominant	591nm
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	450mcd
Viewing Angle	120°
Package / Case	2-PLCC
Size / Dimension	3.20mm L x 2.80mm W
Height (Max)	2.00mm
Mounting Type	Surface Mount
Lens Style	Round with Flat Top
Lens Color	Colorless
Lens Transparency	Clear
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	4 (72 Hours)

Substitute Part Grouping Explanation

Substitute parts for the SMP2-UYC are classified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Parameters:

Color: Yellow
Wavelength - Dominant: 591nm (±1nm acceptable range)
Voltage - Forward (Vf): 1.9V to 2.1V (nominal operating range)
Current - Test: 20mA
Viewing Angle: 120°
Package / Case: 2-PLCC
Mounting Type: Surface Mount
Lens Style: Round with Flat Top
Lens Color: Colorless
Lens Transparency: Clear
Size / Dimension: 3.20mm L x 2.80mm W (±0.1mm tolerance)
Height (Max): 2.00mm to 2.10mm

Parametric Equivalent: SMTL2-UYC from Bivar Inc. is a direct electrical and mechanical equivalent featuring identical wavelength, voltage, brightness, and package specifications with improved product status (Active).

Similar Substitutes: Parts from Everlight Electronics and Kingbright that maintain yellow color (590-592nm wavelength range) with 2-PLCC or compatible 2-SMD J-Lead package configurations, operating voltage range 2.0V to 2.05V, and 120° viewing angle.

Parameter Comparison

Parameter	SMP2-UYC (Main)	SMTL2-UYC (Parametric Equivalent)	67-21/Y2C-AP2R2L/2T	67-21/Y2C-BR2T1B/2T	67-21/YSC-FU1U2B/2T	AA3528SYSK/J3	APED3528SYC
Manufacturer	Bivar Inc.	Bivar Inc.	Everlight Electronics	Everlight Electronics	Everlight Electronics	Kingbright	Kingbright
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant (nm)	591	591	590	592	590	590	588
Voltage - Forward (Vf) (Typ)	1.9V	1.9V	2.0V	2.05V	2.05V	2.0V	2.0V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA	20mA
Millicandela Rating (mcd)	450	450	119	250	582.5	450	250
Viewing Angle	120°	120°	120°	120°	120°	120°	40°
Package / Case	2-PLCC	2-PLCC	2-PLCC	2-SMD, J-Lead	2-SMD, J-Lead	2-PLCC	2-SMD, No Lead
Size / Dimension	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W	3.10mm L x 2.70mm W	3.10mm L x 2.70mm W	3.20mm L x 2.80mm W	3.50mm L x 2.80mm W
Height (Max)	2.00mm	2.10mm	2.10mm	2.10mm	2.10mm	2.10mm	3.40mm
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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	Round with Domed Top
Lens Color	Colorless	Colorless	Colorless	Colorless	Colorless	Colorless	Colorless
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	4 (72 Hours)	4 (72 Hours)	3 (168 Hours)	-	-	3 (168 Hours)	3 (168 Hours)
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	-	-	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Parametric Equivalent (Recommended Primary Substitute): SMTL2-UYC from Bivar Inc. is the recommended direct replacement. This part maintains identical electrical characteristics (1.9V forward voltage, 591nm wavelength, 450mcd brightness) and mechanical compatibility (2-PLCC package, 3.20mm L x 2.80mm W dimensions). The primary advantage is active product status and availability in Tape & Reel packaging. ROHS3 compliance is documented, supporting modern supply chain requirements.

Active Product Alternatives: For applications where design flexibility exists, the following active parts provide functional substitution with documented RoHS3 compliance and improved moisture sensitivity ratings:

AA3528SYSK/J3 (Kingbright): Matches electrical parameters (2V, 590nm, 450mcd, 120° viewing angle) with 2-PLCC package and improved MSL rating of 3.
67-21/Y2C-AP2R2L/2T (Everlight): Maintains package and viewing angle with lower brightness (119mcd) and slightly elevated forward voltage (2.0V).
67-21/Y2C-BR2T1B/2T (Everlight): 2-SMD J-Lead package with 250mcd brightness and 2.05V forward voltage.

Restricted Substitutes: APED3528SYC differs in lens geometry (domed top versus flat top) and height (3.40mm versus 2.00mm), restricting its use to applications where PCB clearance and light distribution patterns tolerate these mechanical deviations.

Frequently Asked Questions (FAQ)

Q: Is SMTL2-UYC a direct drop-in replacement for SMP2-UYC? A: SMTL2-UYC is a parametric equivalent with identical electrical and package specifications. The height difference (2.10mm maximum versus 2.00mm) falls within typical PCB layout tolerances for surface mount components. Verify clearance in your specific design before deployment.

Q: Can I substitute parts from different manufacturers? A: Yes, provided the electrical parameters match: wavelength (590-592nm), forward voltage (1.9V to 2.05V), brightness (minimum 450mcd for 1:1 substitution), and package type (2-PLCC or compatible 2-SMD with matching footprint dimensions). All listed substitutes meet these criteria.

Q: Why is the wavelength range 590-592nm acceptable? A: Human eye perception of yellow light does not differentiate between 590nm and 592nm dominant wavelengths under standard viewing conditions. Both wavelengths fall within the yellow spectrum with identical perceived color quality in indicator applications.

Q: What is the impact of forward voltage differences between 1.9V and 2.05V? A: Forward voltage variations in this range require circuit design verification. At constant current (20mA), the 0.15V difference affects power dissipation and series resistor calculations. Recalculate current-limiting resistor values if substituting parts with different Vf ratings.

Q: Does brightness rating affect substitutability? A: Brightness (millicandela) affects visibility distance and light intensity. The main part (SMP2-UYC) is rated 450mcd. Substitutes with lower brightness (e.g., 119mcd) are suitable only if reduced visibility is acceptable. Higher brightness parts (e.g., 582.5mcd) require verification that visual intensity does not violate design constraints.

Q: What is the significance of the MSL rating difference? A: Moisture Sensitivity Level (MSL) determines storage requirements before soldering. SMP2-UYC requires 72-hour moisture absorption limits (MSL 4), while many substitutes are MSL 3 (168-hour limits). This affects storage shelf life and reflow soldering procedures. MSL 3 components provide more flexible storage conditions.

Q: Can APED3528SYC replace SMP2-UYC in my design? A: APED3528SYC requires design review due to dimensional differences: height is 3.40mm versus 2.00mm, and lens style is domed instead of flat top. The reduced viewing angle (40° versus 120°) also alters light distribution. Substitution is possible only if PCB clearance and optical requirements accommodate these changes.

Q: Are all listed substitutes RoHS3 compliant? A: RoHS3 compliance is documented for SMTL2-UYC, 67-21/Y2C-AP2R2L/2T, AA3528SYSK/J3, and APED3528SYC. Parts 67-21/Y2C-BR2T1B/2T and 67-21/YSC-FU1U2B/2T do not list RoHS status in provided specifications. Verify compliance with your supply chain requirements before selecting these alternatives.

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