SM1204UBWC Equivalent & Substitute Parts

Part Overview

The SM1204UBWC is a blue 470nm LED indication component manufactured by Bivar Inc., designed for discrete 3.3V surface mount applications. This part features a right-angle mounting configuration with a clear, domed rectangular lens measuring 2.00mm x 1.00mm. The component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and procurement requirements. The SM1204UBWC delivers 145mcd luminous intensity at 20mA test current with a 110° viewing angle.

Substiute Parts

SM1204UBWC

Bivar Inc.In Stock: 956SM1204UBWC Datasheet

Current PartRFQ

SM1204SBWC

Bivar Inc.In Stock: 5217SM1204SBWC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM1204UBWC is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Dominant wavelength: 470nm (blue spectrum)
• Peak wavelength: 468nm
• Forward voltage: 3.3V
• Test current: 20mA
• Lens configuration: Rectangle with domed top, colorless/clear
• Lens dimensions: 2.00mm x 1.00mm
• Mounting type: Surface mount, right angle
• Viewing angle: 110°
• Moisture sensitivity level: MSL 4 (72 Hours)

Allowable Variation:

• Millicandela rating: The SM1204SBWC operates at 90mcd versus the SM1204UBWC at 145mcd. This represents a reduction in luminous intensity and is acceptable for applications where the original brightness specification is not a minimum requirement.
• Package configuration: The SM1204SBWC utilizes 1204 (3210 Metric) packaging in Tape & Reel format, compared to the 2-SMD, No Lead configuration of the main part. Both maintain identical physical dimensions (3.20mm L x 1.00mm W, 1.00mm height maximum).
• Product status: The SM1204SBWC is active and RoHS3 compliant, addressing the obsolescence of the SM1204UBWC.

Parameter Comparison

Engineering Selection Recommendations

The SM1204SBWC serves as the active equivalent for the obsolete SM1204UBWC. Selection of the SM1204SBWC is appropriate for new designs and production transitions due to the following factors:

Product Status Alignment: The SM1204SBWC maintains active status with confirmed manufacturing availability, eliminating supply chain risk associated with the obsolete SM1204UBWC.

Regulatory Compliance: The SM1204SBWC is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.

Electrical Equivalence: Both parts operate at identical forward voltage (3.3V) and test current (20mA), with matching wavelength specifications (470nm dominant, 468nm peak). This ensures compatibility with existing circuit designs without modification to current-limiting resistor values or power supply specifications.

Optical Characteristics: The 110° viewing angle, lens style, and lens dimensions remain constant between parts. The reduction in millicandela rating from 145mcd to 90mcd represents a 38% decrease in luminous intensity. This substitution is valid only for applications where the original brightness specification does not establish a minimum requirement.

Physical Compatibility: Both components maintain identical maximum height (1.00mm) and are designed for surface mount, right-angle installation. Minor width variation (1.50mm versus 1.00mm) does not affect PCB layout compatibility for standard right-angle LED mounting footprints.

Frequently Asked Questions (FAQ)

Q: Can the SM1204SBWC replace the SM1204UBWC in all applications?

A: The SM1204SBWC is electrically and optically equivalent to the SM1204UBWC for applications where the luminous intensity specification does not establish a minimum brightness requirement. The 90mcd output of the SM1204SBWC is lower than the 145mcd of the SM1204UBWC. Applications requiring the original 145mcd brightness level must evaluate whether the reduced intensity is acceptable for the intended function.

Q: What is the primary reason for substitution?

A: The SM1204UBWC is classified as obsolete. The SM1204SBWC is the active equivalent from Bivar Inc., ensuring continued component availability and manufacturing support.

Q: Are there differences in packaging between these parts?

A: The SM1204UBWC is supplied in 2-SMD, No Lead configuration, while the SM1204SBWC is supplied in 1204 (3210 Metric) packaging in Tape & Reel format. Both maintain identical physical dimensions for the LED element itself (3.20mm length, 1.00mm maximum height). The packaging difference affects procurement and handling but not PCB-level compatibility.

Q: Do these parts require different circuit design considerations?

A: No. Both parts operate at 3.3V forward voltage with 20mA test current. Existing current-limiting resistor calculations and power supply specifications remain valid. The identical wavelength specifications (470nm dominant) ensure color matching in multi-LED indicator applications.

Q: What is the moisture sensitivity level for both parts?

A: Both the SM1204UBWC and SM1204SBWC are rated MSL 4 (72 Hours), indicating identical moisture handling and storage requirements.

Q: Is the SM1204SBWC compliant with current environmental regulations?

A: Yes. The SM1204SBWC is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement in regulated markets.