SMP4-BC LED GREEN/RED CLEAR 4PLCC SMD Equivalent & Substitute Parts

Part Overview

The SMP4-BC is a dual-color surface mount LED indicator manufactured by Bivar Inc., featuring independent green and red LEDs in a 4-PLCC package. This component provides visual indication across two discrete wavelengths: 570nm for green and 640nm for red. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The SMP4-BC operates at forward voltages of 1.9V (green) and 1.85V (red) with a test current of 20mA for each color, delivering 40mcd and 36mcd brightness respectively.

Substiute Parts

SMP4-BC

Bivar Inc.In Stock: 908SMP4-BC Datasheet

Current PartRFQ

SMTL4-BC

Bivar Inc.In Stock: 34367SMTL4-BC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMP4-BC is determined by strict equivalence across the following critical parameters:

Electrical Compatibility:

• Identical forward voltage specifications (1.9V green, 1.85V red)
• Identical test current ratings (20mA for both colors)
• Identical wavelength outputs (570nm green, 640nm red)
• Identical brightness ratings (40mcd green, 36mcd red)

Mechanical Compatibility:

• Identical package type (4-PLCC)
• Identical lens configuration (round with flat top, clear, 2.40mm diameter)
• Identical color independence (dual independent LEDs)
• Identical viewing angle (120°)
• Identical footprint dimensions (3.20mm L x 2.80mm W)

Environmental Compatibility:

• Identical moisture sensitivity level (MSL 4)
• Identical ECCN and HTSUS classifications

The SMTL4-BC meets all substitution criteria. The primary distinction is packaging format (tape and reel versus bulk) and product status (active versus obsolete), with a minor height variance (2.05mm versus 1.85mm maximum) that does not affect electrical or functional performance within standard PCB assembly tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SMTL4-BC is a direct functional equivalent to the obsolete SMP4-BC. Selection of the SMTL4-BC is supported by the following factors:

Product Status: The SMTL4-BC maintains active product status with Bivar Inc., ensuring continued availability and manufacturing support. The SMP4-BC is classified as obsolete, creating supply chain risk for new designs or production replenishment.

Regulatory Compliance: The SMTL4-BC carries ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements for electronic components in most jurisdictions. These certifications are not specified for the SMP4-BC.

Electrical and Mechanical Equivalence: All critical electrical parameters (forward voltage, test current, wavelength, brightness) and mechanical parameters (package, footprint, lens configuration, viewing angle) are identical between the two parts.

Packaging Consideration: The SMTL4-BC is supplied in tape and reel format, which is standard for automated assembly operations. The SMP4-BC packaging format is not specified but inventory is listed as bulk. For high-volume production, tape and reel packaging reduces handling and improves assembly efficiency.

Height Variance: The SMTL4-BC maximum height of 2.05mm compared to the SMP4-BC maximum height of 1.85mm represents a 0.20mm difference. This variance falls within standard PCB assembly tolerances and does not affect electrical performance or standard reflow soldering processes.

Frequently Asked Questions (FAQ)

Q: Can the SMTL4-BC be used as a direct replacement for the SMP4-BC in existing designs?

A: Yes. The SMTL4-BC is electrically and mechanically equivalent to the SMP4-BC. All forward voltages, test currents, wavelengths, brightness ratings, package dimensions, and lens specifications are identical. The component can be substituted without circuit redesign or PCB layout modification.

Q: What is the significance of the height difference between SMP4-BC (1.85mm) and SMTL4-BC (2.05mm)?

A: The 0.20mm height difference is within standard PCB assembly tolerances and does not affect component functionality or standard reflow soldering processes. This variance is typical across manufacturing batches and does not impact electrical performance or mechanical fit in standard surface mount applications.

Q: Why is the SMP4-BC classified as obsolete?

A: The SMP4-BC is listed as obsolete by the manufacturer. The SMTL4-BC, which is functionally identical, maintains active product status. For new designs or production continuity, the SMTL4-BC should be specified to ensure long-term component availability.

Q: What is the difference between the SMP4-BC and SMTL4-BC packaging?

A: The primary packaging difference is format. The SMTL4-BC is supplied in tape and reel (TR) format, which is standard for automated pick-and-place assembly. The SMP4-BC packaging format is not specified in the available data. Tape and reel packaging is preferred for high-volume production due to improved handling efficiency and reduced manual labor.

Q: Are there any compliance or regulatory differences between the two parts?

A: The SMTL4-BC carries ROHS3 compliance and REACH unaffected certifications. These regulatory statuses are not specified for the SMP4-BC. For applications subject to environmental or regulatory requirements, the SMTL4-BC meets current standards. Both parts share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications.

Q: Can the SMTL4-BC be used in applications requiring the exact height specification of 1.85mm?

A: The SMTL4-BC maximum height is 2.05mm, which exceeds the SMP4-BC maximum height of 1.85mm by 0.20mm. For applications with strict height constraints, this variance must be evaluated against specific design requirements. In standard surface mount applications, this difference is typically accommodated within normal assembly tolerances.

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both the SMP4-BC and SMTL4-BC carry MSL 4 (72 Hours) rating. This indicates the component can be exposed to ambient conditions for up to 72 hours before soldering. After this period, the component must be baked according to IPC standards before assembly. Standard moisture control procedures during storage and handling apply to both parts equally.

Q: Are the electrical characteristics identical for both green and red LEDs?

A: Yes. Both the SMP4-BC and SMTL4-BC feature identical specifications for each color: green LEDs operate at 1.9V forward voltage with 40mcd brightness at 570nm wavelength; red LEDs operate at 1.85V forward voltage with 36mcd brightness at 640nm wavelength. Test current is 20mA for both colors in both parts.