SMP2-SUWD LED White Diffused 2-PLCC SMD Equivalent & Substitute Parts

Part Overview

The SMP2-SUWD is a white diffused LED indicator manufactured by Bivar Inc., designed for surface mount applications in 2-PLCC packaging. This component delivers 2650 millicandela brightness at 20mA forward current with a 3.2V typical forward voltage and 120° viewing angle. The product is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Color	White
Lens Color	Yellow
Lens Transparency	Diffused
Millicandela Rating	2650mcd
Voltage - Forward (Vf) Typical	3.2V
Current - Test	20mA
Viewing Angle	120°
Mounting Type	Surface Mount
Package / Case	2-PLCC
Size / Dimension	3.20mm L x 2.80mm W
Height (Max)	2.00mm
Moisture Sensitivity Level (MSL)	4 (72 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SMP2-SUWD is determined by the following critical parameters: color (white), lens transparency (diffused), forward voltage (3.2V nominal), test current (20mA), viewing angle (120°), mounting type (surface mount), and package classification (2-PLCC). Substitute parts must maintain compatibility across these electrical and mechanical specifications to ensure functional equivalence in circuit applications.

The substitute parts are grouped into two categories:

Parametric Equivalent: SMTL2-SUWD maintains identical electrical characteristics and physical dimensions, differing only in product status (active versus obsolete) and packaging format (tape & reel versus bulk).

Similar Substitute: ASMT-UWB1-NX302 and LTW-670DS provide functional alternatives with variations in specific parameters including millicandela rating, forward voltage tolerance, package configuration, and moisture sensitivity classification.

Parameter Comparison

Parameter	SMP2-SUWD (Main)	SMTL2-SUWD (Parametric Equivalent)	ASMT-UWB1-NX302 (Similar)	LTW-670DS (Similar)
Manufacturer	Bivar Inc.	Bivar Inc.	Broadcom Limited	LITEON
Color	White	White	White, Cool	White
Lens Color	Yellow	Yellow	Yellow	Yellow
Lens Transparency	Diffused	Diffused	Diffused	Not Specified
Millicandela Rating	2650mcd	2650mcd	2300mcd	1100mcd
Voltage - Forward (Vf) Typical	3.2V	3.2V	3.2V	3.5V
Current - Test	20mA	20mA	20mA	20mA
Viewing Angle	120°	120°	120°	120°
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-PLCC	2-PLCC	4-SMD, Flat Lead Exposed Pad	2-SMD, J-Lead
Size / Dimension	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W	3.20mm L x 2.70mm W
Height (Max)	2.00mm	2.10mm	2.10mm	2.05mm
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)	4 (72 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SMTL2-SUWD is the primary substitute for SMP2-SUWD. This Bivar Inc. component maintains identical electrical specifications (3.2V forward voltage, 2650mcd brightness, 20mA test current) and physical dimensions (3.20mm x 2.80mm). The primary distinction is product status: SMTL2-SUWD is active and ROHS3 compliant, whereas SMP2-SUWD is obsolete. Packaging differs (tape & reel versus bulk), but this does not affect functional performance. Height tolerance increases marginally from 2.00mm to 2.10mm maximum, which remains within typical PCB assembly clearance specifications.

ASMT-UWB1-NX302 (Broadcom Limited) serves as a secondary substitute when SMTL2-SUWD availability is constrained. This component shares the 3.2V forward voltage, 20mA test current, 120° viewing angle, and identical footprint dimensions. Brightness output is reduced to 2300mcd (13% lower than SMP2-SUWD), and the package configuration differs (4-SMD with exposed pad versus 2-PLCC). Moisture sensitivity improves to MSL 3 (168 hours). This substitute is suitable for applications where reduced brightness is acceptable and PCB layout accommodates the alternative package footprint.

LTW-670DS (LITEON) represents a tertiary option with significant parameter deviations. Forward voltage increases to 3.5V (0.3V higher), brightness reduces to 1100mcd (58% lower), and package configuration changes to 2-SMD J-Lead. This substitute is appropriate only for applications with relaxed brightness requirements and circuit designs tolerant of higher forward voltage. Moisture sensitivity improves to MSL 3 (168 hours).

All three substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can SMTL2-SUWD directly replace SMP2-SUWD in existing designs?

A: Yes. SMTL2-SUWD is a parametric equivalent with identical electrical specifications and footprint dimensions. The 0.10mm increase in maximum height (2.10mm versus 2.00mm) is negligible for standard PCB assembly. Packaging format (tape & reel) does not affect component performance.

Q: What are the brightness differences between substitute options?

A: SMP2-SUWD and SMTL2-SUWD both deliver 2650mcd. ASMT-UWB1-NX302 provides 2300mcd (87% of original brightness). LTW-670DS provides 1100mcd (41% of original brightness). Selection depends on application brightness requirements.

Q: Does forward voltage variation affect circuit design?

A: SMP2-SUWD, SMTL2-SUWD, and ASMT-UWB1-NX302 all specify 3.2V typical forward voltage. LTW-670DS specifies 3.5V, requiring 0.3V additional voltage headroom in current-limiting circuits. Existing designs using 3.2V components may require resistor recalculation if LTW-670DS is selected.

Q: Are package differences significant for PCB assembly?

A: SMP2-SUWD and SMTL2-SUWD use identical 2-PLCC packages (3.20mm x 2.80mm footprint). ASMT-UWB1-NX302 uses 4-SMD with exposed pad, requiring different PCB land pattern. LTW-670DS uses 2-SMD J-Lead, also requiring different land pattern. Package selection must align with existing PCB design or require layout modification.

Q: What is the significance of MSL rating differences?

A: SMP2-SUWD and SMTL2-SUWD specify MSL 4 (72-hour moisture sensitivity window). ASMT-UWB1-NX302 and LTW-670DS specify MSL 3 (168-hour window). Lower MSL values provide extended shelf life and reduced moisture-related failures during storage and assembly. This is advantageous for inventory management and manufacturing processes with extended lead times.

Q: Which substitute offers the best long-term availability?

A: ASMT-UWB1-NX302 (Broadcom) and LTW-670DS (LITEON) are both active products from established manufacturers with high inventory levels (92,200 and 47,782 units respectively). SMTL2-SUWD (Bivar) is active with 752 units in stock. All three are suitable for long-term design continuity.

Q: Can color temperature differences affect application performance?

A: ASMT-UWB1-NX302 specifies cool white (4500K–8000K color temperature), whereas SMP2-SUWD and SMTL2-SUWD specify standard white without color temperature specification. LTW-670DS specifies white without color temperature detail. If color temperature consistency is critical for visual indication, SMTL2-SUWD is the preferred substitute.

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