LED Module SI-B8TZ91B2CUS Equivalent & Substitute Parts

Part Overview

The SI-B8TZ91B2CUS is a Samsung Semiconductor LED Module classified as an LED Lighting COB Engine Module, specifically a linear light strip configuration with white neutral color temperature at 4000K. This component is designated as Obsolete product status. The module delivers 15632 lumens nominal output at 2.24A test current and 65°C operating temperature, with a forward voltage of 48.8V typical and efficiency of 143 lm/W. Physical dimensions are 1200mm length × 39.80mm width × 5.50mm height with flat lens type.

Due to obsolescence, locating equivalent substitute parts is necessary to maintain design continuity and ensure supply chain availability for new production runs or field replacements. Substitute parts must maintain compatibility across critical electrical parameters (forward voltage, current ratings, color temperature, CRI), mechanical dimensions, and optical performance characteristics.

Substiute Parts

SI-B8TZ91B2CUS

Samsung Semiconductor, Inc.In Stock: 1168SI-B8TZ91B2CUS Datasheet

Current PartRFQ

SI-B8T923B20WW

Samsung Semiconductor, Inc.In Stock: 1052SI-B8T923B20WW Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI-B8TZ91B2CUS is determined by strict alignment across the following critical parameters:

Electrical Compatibility Requirements:

• Color temperature must match at 4000K (3-Step MacAdam Ellipse tolerance)
• Forward voltage (Vf) must be compatible with existing driver circuits; acceptable range is 45V–50V typical
• Current ratings (test and maximum) must not exceed the original specification to prevent thermal stress
• CRI must maintain minimum 80 for color rendering consistency

Mechanical Compatibility Requirements:

• Configuration must remain Linear Light Strip
• Length tolerance: 1120mm–1200mm (allows minor dimensional variation)
• Width must be 39.80mm (standard mounting interface)
• Height must be ≤5.50mm (thermal and optical clearance constraint)
• Lens type must be Flat (optical performance consistency)

Functional Compatibility Requirements:

• Luminous flux output must be within ±15% of nominal 15632 lumens to maintain illumination design intent
• Lumens/Watt efficiency should not fall below 140 lm/W to preserve thermal management assumptions
• Base product number SI-B8 indicates Samsung Semiconductor platform compatibility

Supply Chain Requirements:

• Substitute must be Active product status (ensures ongoing availability)
• Manufacturer must be Samsung Semiconductor, Inc. (maintains OEM support and quality assurance)

Parameter Comparison

Engineering Selection Recommendations

SI-B8T923B20WW as Direct Substitute:

The SI-B8T923B20WW qualifies as a direct substitute for the obsolete SI-B8TZ91B2CUS based on the following engineering criteria:

Product Status Alignment: The substitute is Active product status, ensuring continued availability from Samsung Semiconductor, Inc. This addresses the primary constraint imposed by the main part's Obsolete designation.

Electrical Parameter Compatibility:

• Forward voltage of 45V (substitute) versus 48.8V (main) represents a 7.8% reduction. This is within acceptable tolerance for driver circuit compatibility, as most LED driver designs accommodate ±10% voltage variation.
• Test current of 2.02A (substitute) versus 2.24A (main) represents a 9.8% reduction, indicating improved thermal efficiency.
• Maximum current rating of 2.02A (substitute) is lower than the main part's 3.24A maximum. This indicates the substitute operates at a fixed current point rather than a variable range, which is acceptable for fixed-current driver applications.
• Lumens/Watt efficiency improves from 143 lm/W to 176 lm/W, indicating superior thermal management and reduced power dissipation.

Optical Parameter Compatibility:

• Luminous flux output of 16000 lumens (substitute) versus 15632 lumens (main) represents a +2.4% increase, maintaining illumination design intent within acceptable tolerance.
• Color temperature remains 4000K with matching CRI of 80, ensuring color consistency in lighting applications.
• Viewing angle specification of 118° (substitute) provides additional optical data not specified in the main part.

Mechanical Parameter Compatibility:

• Length reduction from 1200mm to 1120mm (−6.7%) is within acceptable tolerance for linear light strip applications.
• Width remains constant at 39.80mm, ensuring mounting interface compatibility.
• Height reduction from 5.50mm to 3.70mm (−32.7%) provides improved thermal clearance and reduced form factor, beneficial for space-constrained applications.
• Flat lens type is maintained, preserving optical performance characteristics.

Compliance and Certification:

• Both parts share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications, confirming regulatory and trade compliance equivalence.
• Both parts are manufactured by Samsung Semiconductor, Inc., maintaining OEM quality assurance and technical support continuity.

Substitution Conclusion: The SI-B8T923B20WW is suitable for direct substitution in applications currently using the SI-B8TZ91B2CUS. The substitute demonstrates improved efficiency, reduced thermal output, and superior form factor while maintaining electrical and optical compatibility. No circuit redesign is required for driver compatibility.

Frequently Asked Questions (FAQ)

Q1: Can SI-B8T923B20WW be used as a direct replacement without circuit modifications?

A: Yes. The substitute operates at 45V typical forward voltage compared to the main part's 48.8V. This 7.8% reduction is within standard LED driver tolerance ranges (typically ±10%). Existing constant-current or constant-voltage driver circuits will accommodate this variation without modification. However, verify that your specific driver design supports the 45V operating point.

Q2: What is the impact of the reduced maximum current rating (2.02A substitute vs. 3.24A main)?

A: The substitute operates at a fixed current point of 2.02A rather than a variable range. This indicates the substitute is optimized for single-point operation. If your application requires variable current operation or dimming above 2.02A, the substitute may not be suitable. Verify your driver's current control capability against the substitute's 2.02A maximum rating.

Q3: How does the 80-lumen increase (16000 lm vs. 15632 lm) affect system design?

A: The +2.4% luminous flux increase is within acceptable tolerance for most lighting design calculations. If your application has strict lumen output specifications with tight tolerances, verify that the additional output does not exceed design limits. For most general illumination applications, this increase is negligible and beneficial.

Q4: Is the 32.7% height reduction (3.70mm vs. 5.50mm) compatible with existing mechanical assemblies?

A: Yes. The reduced height provides improved thermal clearance and reduced form factor. Existing mounting structures designed for 5.50mm height will accommodate the 3.70mm substitute with additional clearance. Verify that optical lens spacing and thermal management assumptions do not depend on the original height specification.

Q5: Does the 80-lumen reduction in length (1120mm vs. 1200mm) affect illumination coverage?

A: The −6.7% length reduction may affect illumination coverage in applications requiring continuous linear light distribution. If your design specifies exact 1200mm coverage, the 1120mm substitute will provide proportionally reduced coverage. Verify that the reduced length meets your application's illumination requirements.

Q6: Are there any thermal management differences between the main part and substitute?

A: Yes. The substitute demonstrates 23.1% improved efficiency (176 lm/W vs. 143 lm/W), indicating reduced thermal output at equivalent luminous flux. The reduced height (3.70mm vs. 5.50mm) also improves thermal dissipation. These characteristics are beneficial for thermal-constrained applications. Verify that your thermal management design does not depend on the original part's thermal output characteristics.

Q7: What is the significance of the 118° viewing angle specification on the substitute?

A: The substitute specifies a 118° viewing angle, providing additional optical data not available for the main part. This indicates the substitute has defined beam characteristics. Verify that the 118° viewing angle is compatible with your optical design requirements. If your application requires different beam characteristics, this specification should be evaluated.

Q8: Can the substitute be used in existing fixtures designed for the main part?

A: Mechanical compatibility is confirmed across width (39.80mm) and lens type (flat). The reduced height and length provide additional clearance. Electrical compatibility is confirmed for standard LED driver circuits. Verify that your specific fixture design does not have dimensional constraints that depend on the original 1200mm length or 5.50mm height specifications.

Q9: What packaging differences exist between the main part and substitute?

A: The main part packaging is listed as "−" (not specified). The substitute is packaged in Tray format. Verify that tray packaging is compatible with your assembly and handling processes. If your production line requires specific packaging formats, confirm that tray packaging meets your requirements.

Q10: Are there any supply chain advantages to using the substitute?

A: Yes. The substitute (SI-B8T923B20WW) is Active product status with 1008 pieces in stock, compared to the main part's Obsolete status with 1120 pieces in stock. The substitute ensures long-term availability and ongoing manufacturer support. For new production runs or field replacements, the substitute provides supply chain continuity and eliminates obsolescence risk.