SPMWH1228FD5WAUMS4 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WAUMS4 is a Samsung Semiconductor LM281B warm white LED in 2835 metric package (1113 case) designed for surface mount applications. This component operates at 3500K color temperature with 65 lumens at 25°C and 150mA test current. The part is classified as "Not For New Designs," indicating it has been superseded in Samsung's product portfolio. Identifying equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing flexibility when the primary part becomes unavailable or when transitioning to active product lines.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color	White, Warm	—
CCT (Correlated Color Temperature)	3500K	K
Flux @ 25°C, 150mA	65 lm (63–67 lm range)	lm
Forward Voltage (Vf) Typical	3.1V	V
Test Current	150mA	mA
Maximum Current	160mA	mA
Lumens per Watt @ 150mA	140 lm/W	lm/W
CRI (Color Rendering Index)	80	—
Viewing Angle	120°	°
Package / Case	1113 (2835 Metric)	—
Mounting Type	Surface Mount	—
Size / Dimension	0.138" L × 0.110" W (3.50mm × 2.80mm)	—
Height – Seated (Max)	0.030" (0.75mm)	—
Thermal Resistance	25°C/W	°C/W
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD5WAUMS4 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Package / Case: 1113 (2835 Metric) — mechanical and thermal compatibility
Mounting Type: Surface Mount — PCB assembly compatibility
Color: White, Warm — optical output specification
Forward Voltage (Vf): 3.1V nominal — circuit design compatibility
Test Current: 150mA — electrical operating point
Maximum Current: 160mA — thermal and reliability envelope
Viewing Angle: 120° — optical distribution requirement
CRI: 80 — color rendering specification
RoHS Compliance: Required — regulatory requirement
MSL: 2A (4 Weeks) — moisture handling and storage

Secondary Consideration:

CCT (Color Temperature): 3500K is the primary specification; 3000K variants are listed as parametric equivalents but represent a different color temperature output and should be selected only when 3000K operation is acceptable for the application.

Substitutes are grouped into two categories:

Direct Manufacturer Substitutes (LM281B+ Series): Parts with identical electrical and mechanical parameters but upgraded series designation (LM281B+) and Active product status.
Parametric Equivalents (LM281B Series): Parts with identical parameters to the main part, maintaining the same series designation and "Not For New Designs" status.
Parametric Equivalents with CCT Variation (3000K): Parts with all parameters identical except CCT specification (3000K instead of 3500K), available in LM281B+ Active series.

Parameter Comparison

Part Number	Series	Product Status	CCT (K)	Flux @ 25°C (lm)	Vf (V)	Test Current (mA)	Max Current (mA)	lm/W @ 150mA	CRI	Viewing Angle (°)	Package	Inventory (Pcs)
SPMWH1228FD5WAUMS4	LM281B	Not For New Designs	3500	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	15,824
SPMWH1228FD5WAUMSE	LM281B+	Active	3500	66 (64–68)	3.1	150	160	142	80	120	1113 (2835)	707
SPMWH1228FD5WAU0S4	LM281B	Not For New Designs	3500	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	40,790
SPMWH1228FD5WAUUS4	LM281B	Not For New Designs	3500	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	28,752
SPMWH1228FD5WAV0SE	LM281B+	Active	3000	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	1,114
SPMWH1228FD5WAVKSE	LM281B+	Active	3000	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	1,141
SPMWH1228FD5WAVMSE	LM281B+	Active	3000	65 (63–67)	3.1	150	160	140	80	120	1113 (2835)	855
SPMWH1228FD5WAVUSE	LM281B+	Active	3000	65 (63–67)	3.0	150	160	144	80	120	1113 (2835)	1,042

Engineering Selection Recommendations

For Direct Substitution (Identical 3500K CCT):

SPMWH1228FD5WAUMSE is the primary recommended substitute. This part maintains identical electrical and mechanical specifications to SPMWH1228FD5WAUMS4 while offering Active product status from Samsung Semiconductor. The LM281B+ series designation indicates an improved or updated version of the LM281B platform. Flux output is marginally higher (66 lm vs. 65 lm nominal), and luminous efficacy is improved (142 lm/W vs. 140 lm/W), representing a performance enhancement. This part is suitable for new designs and provides long-term supply continuity.

For Parametric Equivalence (Same Series, 3500K CCT):

SPMWH1228FD5WAU0S4 and SPMWH1228FD5WAUUS4 are parametric equivalents to the main part, maintaining identical specifications within the LM281B series. Both parts retain "Not For New Designs" status. These parts are suitable for replacement in existing designs or inventory replenishment where the LM281B series is specified. SPMWH1228FD5WAU0S4 offers the highest inventory availability (40,790 pcs).

For Color Temperature Variation (3000K CCT):

SPMWH1228FD5WAV0SE, SPMWH1228FD5WAVKSE, SPMWH1228FD5WAVMSE, and SPMWH1228FD5WAVUSE are parametric equivalents with 3000K color temperature instead of 3500K. All four parts are LM281B+ Active series components. These parts are suitable only when 3000K warm white output is acceptable for the application. SPMWH1228FD5WAVUSE exhibits a lower forward voltage (3.0V vs. 3.1V) and higher luminous efficacy (144 lm/W vs. 140 lm/W), representing a distinct electrical variant.

Compliance and Regulatory Considerations:

All listed substitute parts maintain RoHS Compliance and MSL 2A (4 Weeks) specifications, ensuring regulatory alignment and moisture handling compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD5WAUMSE be used as a direct replacement for SPMWH1228FD5WAUMS4?

A: Yes. SPMWH1228FD5WAUMSE is a direct substitute with identical electrical and mechanical parameters. The part maintains the same 3500K color temperature, 3.1V forward voltage, 150mA test current, 120° viewing angle, and 1113 (2835) package. The LM281B+ series designation indicates an updated product line with Active status, providing improved long-term availability.

Q: What is the difference between LM281B and LM281B+ series?

A: The LM281B+ represents an updated or improved version of the LM281B platform. In this product line, LM281B+ parts are designated as Active products, while LM281B parts are marked "Not For New Designs." Electrically and mechanically, the parts are compatible; however, LM281B+ variants offer better supply continuity and are recommended for new designs.

Q: Can I substitute a 3000K part for the 3500K main part?

A: Substitution is possible only if the application accepts 3000K color temperature output. The 3000K variants (SPMWH1228FD5WAV0SE, SPMWH1228FD5WAVKSE, SPMWH1228FD5WAVMSE, SPMWH1228FD5WAVUSE) maintain all other electrical and mechanical specifications but produce a warmer (lower) color temperature. This substitution requires explicit design approval if color temperature is a critical specification.

Q: What is the significance of the forward voltage difference in SPMWH1228FD5WAVUSE?

A: SPMWH1228FD5WAVUSE operates at 3.0V typical forward voltage compared to 3.1V in other variants. This 0.1V difference affects circuit design, particularly in current-limiting resistor calculations and power supply requirements. This part also exhibits higher luminous efficacy (144 lm/W vs. 140 lm/W). Selection should be based on circuit compatibility and power budget requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain RoHS Compliance status, ensuring regulatory alignment with the original SPMWH1228FD5WAUMS4 component.

Q: What is the moisture sensitivity level, and how does it affect handling?

A: All parts are classified as MSL 2A (4 Weeks), indicating they can be exposed to ambient conditions (30°C / 60% RH) for up to 4 weeks after packaging before requiring baking. This specification applies uniformly across all substitute parts and does not differentiate substitution suitability.

Q: Which substitute part offers the best inventory availability?

A: SPMWH1228FD5WAU0S4 offers the highest inventory availability at 40,790 pcs. This part is a parametric equivalent with identical specifications to the main part and "Not For New Designs" status.

Q: Can I use SPMWH1228FD5WAVUSE in a design originally specified for SPMWH1228FD5WAUMS4?

A: Substitution is possible with design review. SPMWH1228FD5WAVUSE differs in three parameters: CCT (3000K vs. 3500K), forward voltage (3.0V vs. 3.1V), and luminous efficacy (144 lm/W vs. 140 lm/W). The lower forward voltage reduces power consumption and heat generation, while the 3000K color temperature produces warmer light output. Circuit validation is required to confirm compatibility with existing current-limiting and power supply designs.

Q: Are the package dimensions identical across all substitute parts?

A: Yes. All substitute parts use the 1113 (2835 Metric) package with identical dimensions: 0.138" L × 0.110" W (3.50mm × 2.80mm) and maximum seated height of 0.030" (0.75mm). Mechanical compatibility with PCB layouts and thermal management is maintained across all variants.

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