SPMWH1228FD7WATMS3 Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD7WATMS3 is a Samsung Semiconductor LM281B series LED lighting component in 2835 metric package (1113 case). This surface mount LED operates at neutral white 4000K color temperature with 3.1V forward voltage and 150mA test current, delivering 58 lumens at 25°C with 125 lm/W efficiency and 90 CRI. The part is marked as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

SPMWH1228FD7WATMS3

Samsung Semiconductor, Inc.In Stock: 1191SPMWH1228FD7WATMS3 Datasheet

Current PartRFQ

SPMWH1228FD7WATMSC

Samsung Semiconductor, Inc.In Stock: 988SPMWH1228FD7WATMSC Datasheet

DirectRFQ

SPMWH1228FD7WAT0S3

Samsung Semiconductor, Inc.In Stock: 5559SPMWH1228FD7WAT0S3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPMWH1228FD7WATMS3 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Color: White, Neutral
• CCT: 4000K
• Forward Voltage (Vf): 3.1V
• Test Current: 150mA
• Maximum Current: 160mA
• CRI: 90
• Viewing Angle: 120°
• Package / Case: 1113 (2835 Metric)
• Size / Dimension: 3.50mm x 2.80mm
• Height - Seated (Max): 0.75mm
• Mounting Type: Surface Mount
• RoHS Status: RoHS Compliant
• MSL: 2A (4 Weeks)

Allowable Variation Parameters:

• Flux @ 25°C: Tolerance range 56lm to 59lm (specification range provided)
• Lumens/Watt: Derived from flux and current; variation acceptable within flux tolerance
• Thermal Resistance: Variation acceptable (17°C/W to 25°C/W)
• Series Designation: LM281B or LM281B+ (same base product family)
• Product Status: Active or Not For New Designs (both acceptable for substitution)

The two identified substitute parts meet all mandatory parameters while operating within allowable variations for thermal and luminous characteristics.

Parameter Comparison

Engineering Selection Recommendations

SPMWH1228FD7WAT0S3 (Parametric Equivalent)

This part is a parametric equivalent to the main part SPMWH1228FD7WATMS3. Both are LM281B series components with identical electrical specifications, thermal resistance (17°C/W), and luminous output (58 lm at 150mA). Both carry "Not For New Designs" status. Selection of this substitute is appropriate for direct replacement in existing designs where the main part is unavailable. Higher inventory availability (5492 pcs vs. 1112 pcs) supports sourcing continuity.

SPMWH1228FD7WATMSC (Direct Manufacturer Substitute)

This part is a direct manufacturer substitute from Samsung Semiconductor, Inc., designated as LM281B+ series. It maintains all critical electrical parameters (3.1V Vf, 150mA test current, 160mA max, 90 CRI, 120° viewing angle) and identical mechanical package (2835 metric, 3.50 x 2.80 x 0.75mm). The key differences are:

• Product Status: Active (vs. Not For New Designs for main part)
• Luminous Output: 55 lm at 150mA (within acceptable tolerance; main part specification range is 56–59 lm, substitute range is 53–56 lm, with 55 lm overlap)
• Thermal Resistance: 25°C/W (vs. 17°C/W for main part)

This substitute is suitable for applications where thermal management is not a limiting constraint. The higher thermal resistance requires verification that junction temperature remains within acceptable limits for the application. RoHS compliance and MSL rating are identical.

Both substitutes maintain full electrical and mechanical compatibility with the original part. Selection between them depends on thermal design requirements and product lifecycle considerations.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD7WAT0S3 be used as a direct replacement for SPMWH1228FD7WATMS3?

A: Yes. Both parts are LM281B series with identical electrical specifications (3.1V, 150mA, 58 lm @ 25°C), thermal resistance (17°C/W), and package dimensions (2835 metric, 3.50 x 2.80 x 0.75mm). They are parametric equivalents with no functional differences in circuit operation or PCB layout.

Q: What is the difference between SPMWH1228FD7WATMSC (LM281B+) and the main part (LM281B)?

A: The LM281B+ is a newer series variant with identical electrical parameters but different thermal characteristics. Luminous output is 55 lm (vs. 58 lm for LM281B) and thermal resistance is 25°C/W (vs. 17°C/W). The LM281B+ is marked Active status, while LM281B is Not For New Designs. Both are mechanically and electrically compatible for circuit operation.

Q: Does the 3 lm difference in flux between the main part and SPMWH1228FD7WATMSC affect compatibility?

A: The flux difference (58 lm vs. 55 lm) falls within the specified tolerance ranges for each part (main part: 56–59 lm; substitute: 53–56 lm). Both parts meet the 4000K neutral white specification and 90 CRI requirement. Application compatibility depends on whether the design requires the higher output of the LM281B or can operate within the LM281B+ output range.

Q: Are all three parts RoHS compliant?

A: Yes. SPMWH1228FD7WATMS3, SPMWH1228FD7WAT0S3, and SPMWH1228FD7WATMSC are all RoHS Compliant with identical MSL rating (2A, 4 Weeks).

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All three parts share identical package specifications (1113 case, 2835 metric, 3.50 x 2.80 x 0.75mm) and mounting type (Surface Mount). No PCB layout or footprint changes are required for substitution.

Q: Which substitute should be selected for new designs?

A: SPMWH1228FD7WATMSC (LM281B+) is marked Active status and is the manufacturer's current production part. It is the appropriate choice for new designs. The LM281B variants (main part and SPMWH1228FD7WAT0S3) are marked Not For New Designs and should be used only for legacy design support or existing inventory management.

Q: What is the impact of the 8°C/W difference in thermal resistance between LM281B and LM281B+?

A: The higher thermal resistance (25°C/W vs. 17°C/W) of the LM281B+ results in higher junction temperature rise for the same power dissipation. At 150mA and 3.1V (0.465W), the temperature rise difference is approximately 3.7°C. Thermal design verification is required if the application operates near maximum junction temperature limits.

Q: Are there any electrical parameter differences that affect circuit design?

A: No. All three parts have identical forward voltage (3.1V typical), test current (150mA), maximum current (160mA), and viewing angle (120°). Circuit design, current limiting resistor values, and drive electronics remain unchanged across all three parts.