SPMWH1228FD7WATMS4 Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD7WATMS4 is a Samsung Semiconductor LM281B series LED lighting component in 2835 metric package (1113). This surface-mount LED operates at neutral white 4000K color temperature with a forward voltage of 3.1V and test current of 150mA. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. This obsolescence necessitates identification of equivalent and substitute components to maintain design continuity and ensure supply chain availability for existing applications and production requirements.

Substiute Parts

SPMWH1228FD7WATMS4

Samsung Semiconductor, Inc.In Stock: 41022SPMWH1228FD7WATMS4 Datasheet

Current PartRFQ

SPMWH1228FD7WATMSE

Samsung Semiconductor, Inc.In Stock: 1067SPMWH1228FD7WATMSE Datasheet

DirectRFQ

SPMWH1228FD7WAT0S4

Samsung Semiconductor, Inc.In Stock: 40675SPMWH1228FD7WAT0S4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPMWH1228FD7WATMS4 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
• Viewing Angle: 120°
• Package / Case: 1113 (2835 Metric)
• Physical Dimensions: 3.50mm × 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: Acceptable range 59–63lm (specification tolerance)
• Lumens per Watt: Acceptable variation within performance envelope
• Thermal Resistance: Acceptable variation within thermal design limits
• Series designation: LM281B or LM281B+ (same base product family)
• Product Status: Active or Not For New Designs (both acceptable for substitution purposes)

The identified substitute parts meet all mandatory matching criteria while operating within allowable performance tolerances.

Parameter Comparison

Engineering Selection Recommendations

SPMWH1228FD7WATMSE (LM281B+ Series - Active Status)

This substitute is the preferred selection for new production and ongoing supply requirements. The LM281B+ series carries Active product status, ensuring long-term availability and manufacturer support. All electrical and mechanical parameters align with the main part specifications. The thermal resistance of 25°C/W is higher than the main part (17°C/W), requiring thermal design verification in applications with stringent thermal constraints. The flux output of 58lm (56–60lm range) is within acceptable tolerance for neutral white 4000K LED applications. RoHS compliance and MSL rating are identical to the main part.

SPMWH1228FD7WAT0S4 (LM281B Series - Parametric Equivalent)

This part provides parametric equivalence with identical electrical performance (131 lm/W, 61lm flux output) and thermal characteristics (17°C/W) to the main part. However, it retains "Not For New Designs" status, limiting its suitability for long-term supply chain planning. This part is suitable for legacy system maintenance and repair applications where existing design validation is already established. The packaging and mechanical specifications are identical to the main part.

Compliance Considerations

Both substitute parts maintain RoHS compliance and identical MSL ratings (2A, 4 Weeks), ensuring compatibility with standard surface-mount assembly processes and storage requirements. No additional handling or process modifications are required when transitioning from the main part to either substitute.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD7WATMSE be used as a direct replacement for SPMWH1228FD7WATMS4?

A: Yes. Both parts share identical electrical parameters (3.1V forward voltage, 150mA test current, 160mA maximum current), identical color and CCT specifications (White, Neutral, 4000K), identical mechanical package (1113/2835 metric, 3.50mm × 2.80mm, 0.75mm height), and identical CRI (90) and viewing angle (120°). The flux output of 58lm for SPMWH1228FD7WATMSE falls within the acceptable tolerance range for this application class. Thermal resistance is higher (25°C/W vs. 17°C/W); verify thermal design margins in applications with elevated ambient temperatures or high-density LED arrays.

Q: What is the difference between SPMWH1228FD7WATMSE and SPMWH1228FD7WAT0S4?

A: Both parts are electrically equivalent with identical flux output (61lm for WAT0S4 vs. 58lm for WATMSE) and identical thermal resistance (17°C/W for WAT0S4 vs. 25°C/W for WATMSE). The primary difference is product status: SPMWH1228FD7WATMSE is Active, while SPMWH1228FD7WAT0S4 is Not For New Designs. For new production, SPMWH1228FD7WATMSE is the recommended choice. SPMWH1228FD7WAT0S4 is suitable for legacy system support where design validation is already complete.

Q: Are there any package or mounting differences between these parts?

A: No. All three parts use identical 1113 (2835 metric) package specifications with surface-mount technology. Physical dimensions (3.50mm × 2.80mm), seated height (0.75mm maximum), and mounting type are identical. No PCB layout or assembly process modifications are required when substituting between these parts.

Q: What is the impact of the thermal resistance difference between SPMWH1228FD7WATMS4 and SPMWH1228FD7WATMSE?

A: SPMWH1228FD7WATMSE has thermal resistance of 25°C/W compared to 17°C/W for the main part. This 8°C/W difference means the LED junction will operate approximately 1.2°C warmer at 150mA test current in identical thermal environments. In applications with thermal design margins, this difference is negligible. In thermally constrained designs (high ambient temperature, dense LED arrays, or limited heat dissipation), thermal simulation or testing is required to confirm acceptable junction temperature operation.

Q: Do these parts require different handling or storage procedures?

A: No. All three parts share identical MSL rating (2A, 4 Weeks) and RoHS compliance status. Standard surface-mount component handling, moisture control, and storage procedures apply uniformly across all three parts. No special precautions or process modifications are necessary.

Q: Which substitute should be selected for a new product design?

A: SPMWH1228FD7WATMSE (LM281B+ series) is the appropriate selection for new product designs. This part carries Active product status, ensuring manufacturer support and long-term supply availability. All electrical and mechanical specifications are compatible with the original design parameters.