SM1204BWC Blue LED 1204 SMD Right Angle Equivalent & Substitute Parts

Part Overview

The SM1204BWC is a blue LED indication component manufactured by Bivar Inc. in the 1204 (3210 Metric) surface mount right angle package. This part operates at 3.9V forward voltage with a dominant wavelength of 466nm and provides 9mcd luminous intensity at 20mA test current. The SM1204BWC is classified as obsolete product status, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

SM1204BWC

Bivar Inc.In Stock: 1212SM1204BWC Datasheet

Current PartRFQ

SM1204SBWC

Bivar Inc.In Stock: 5217SM1204SBWC Datasheet

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155124BS73200

Würth ElektronikIn Stock: 5002155124BS73200 Datasheet

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SML-LXR85USBC-TR

Lumex Opto/Components Inc.In Stock: 1172SML-LXR85USBC-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM1204BWC is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Blue
• Lens Transparency: Clear
• Lens Style: Rectangle with Domed Top
• Mounting Type: Surface Mount, Right Angle
• Test Current: 20mA
• Wavelength Range: Blue spectrum (428nm–470nm acceptable)

Secondary Compatibility Criteria:

• Forward Voltage (Vf): 3.3V to 3.9V range
• Millicandela Rating: Minimum 9mcd
• Viewing Angle: 110° or greater
• Physical footprint compatibility with 1204 package designation

All three substitute parts meet the primary compatibility criteria. Variations in forward voltage, luminous intensity, and viewing angle are within acceptable substitution parameters for indication LED applications. Package case designations and physical dimensions require verification against specific PCB layout constraints.

Parameter Comparison

Engineering Selection Recommendations

SM1204SBWC (Bivar Inc.) - Primary Substitute

The SM1204SBWC is the closest functional equivalent to the SM1204BWC. Both components share identical package designation (1204), physical dimensions (3.20mm L x 1.00mm W x 1.00mm H), lens specifications, and viewing angle (110°). The SM1204SBWC operates at 3.3V forward voltage compared to 3.9V for the main part, representing a 0.6V reduction suitable for circuit redesign. Luminous intensity increases from 9mcd to 90mcd, providing enhanced brightness for indication applications. The SM1204SBWC maintains active product status with ROHS3 compliance and REACH unaffected certification. Identical MSL rating (4, 72 Hours) ensures equivalent moisture handling requirements.

155124BS73200 (Würth Elektronik) - Secondary Substitute

The 155124BS73200 provides functional substitution with notable dimensional variations. Package case designation changes from 1204 to 2-SMD Side View, with increased width (1.50mm vs 1.00mm) and height (1.20mm vs 1.00mm). Forward voltage is 3.4V, and luminous intensity reaches 150mcd. Viewing angle expands to 120°. The improved MSL rating (3, 168 Hours) offers superior moisture resistance. ROHS3 compliance and REACH unaffected status are confirmed. PCB layout compatibility must be verified due to dimensional changes.

SML-LXR85USBC-TR (Lumex Opto/Components Inc.) - Tertiary Substitute

The SML-LXR85USBC-TR functions as a substitute with package case designation 2-SMD No Lead and increased width (1.60mm). Forward voltage is 3.5V with 30mcd luminous intensity. Viewing angle is significantly wider at 160°. Superior MSL rating (2A, 4 Weeks) indicates enhanced moisture resistance. ROHS3 compliance and REACH unaffected status are confirmed. Physical footprint changes require PCB layout verification.

Compliance and Certification Status

All three substitute parts carry ROHS3 compliance and REACH unaffected certification. The main part SM1204BWC does not specify these certifications due to obsolete status. For new designs or procurement requiring regulatory compliance, all substitute options satisfy current environmental and chemical restriction requirements.

Frequently Asked Questions (FAQ)

Q1: Can SM1204SBWC directly replace SM1204BWC without circuit modification?

The SM1204SBWC shares identical package, physical dimensions, and mounting type with the SM1204BWC. Forward voltage differs by 0.6V (3.3V vs 3.9V). Direct replacement requires circuit verification to confirm the lower forward voltage is compatible with existing current-limiting resistor values and power supply specifications. Luminous intensity increases from 9mcd to 90mcd, which may affect visual indication brightness.

Q2: What are the physical footprint differences between substitute options?

SM1204SBWC maintains identical dimensions to the main part (3.20mm L x 1.00mm W x 1.00mm H). The 155124BS73200 increases to 3.20mm L x 1.50mm W x 1.20mm H. The SML-LXR85USBC-TR measures 3.20mm L x 1.60mm W x 1.00mm H. PCB layout compatibility must be verified for the Würth and Lumex options due to width and height variations.

Q3: How do forward voltage differences affect circuit design?

The main part operates at 3.9V, while substitutes range from 3.3V to 3.5V. Lower forward voltage reduces power dissipation in series resistors and may require resistor value adjustment to maintain 20mA test current. Circuit simulation or empirical testing is necessary to confirm proper LED brightness and current limiting behavior with each substitute option.

Q4: What is the significance of luminous intensity variations?

The main part provides 9mcd at 20mA test current. Substitutes range from 30mcd to 150mcd. Higher luminous intensity increases visual brightness for indication applications. Circuit design must account for potential brightness differences if visual consistency is critical across multiple LED installations.

Q5: Are all substitute parts suitable for high-moisture environments?

Moisture Sensitivity Level (MSL) ratings differ: SM1204BWC and SM1204SBWC both rate MSL 4 (72 Hours). The 155124BS73200 rates MSL 3 (168 Hours), and SML-LXR85USBC-TR rates MSL 2A (4 Weeks). Higher MSL ratings indicate superior moisture resistance. For applications requiring extended moisture exposure or storage, the Lumex option provides the best protection.

Q6: Do all substitutes meet current environmental regulations?

All three substitute parts carry ROHS3 compliance and REACH unaffected certification. The main part SM1204BWC does not specify these certifications due to obsolete status. For procurement requiring regulatory compliance documentation, all substitute options satisfy current environmental and chemical restriction requirements.

Q7: What viewing angle considerations apply to substitution?

The main part provides 110° viewing angle. SM1204SBWC maintains 110°. The 155124BS73200 expands to 120°, and SML-LXR85USBC-TR reaches 160°. Wider viewing angles increase visibility from off-axis positions. Circuit design must confirm whether the original 110° specification is a functional requirement or if wider angles are acceptable.

Q8: How do package case designations affect PCB compatibility?

The main part and SM1204SBWC both use 1204 (3210 Metric) package designation with identical footprints. The 155124BS73200 uses 2-SMD Side View package, and SML-LXR85USBC-TR uses 2-SMD No Lead package. These designations indicate different PCB pad layouts and solder patterns. Direct footprint compatibility cannot be assumed without detailed package drawings and PCB design verification.