Equivalent & Substitute Parts for SPMWH1228FD5WATUS2

Part Overview

The SPMWH1228FD5WATUS2 is a Samsung Semiconductor LM281B neutral white LED in 2835 metric package (1113 case) designed for surface mount lighting applications. This component operates at 4000K color temperature with 150mA test current and 3.1V typical forward voltage. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of parametric equivalents is necessary to maintain design continuity and ensure supply chain availability for existing applications and production requirements.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color	White, Neutral	—
CCT (Correlated Color Temperature)	4000K	K
Flux @ 25°C, 150mA	59lm (57–61lm range)	lm
Current - Test	150mA	mA
Voltage - Forward (Typ)	3.1V	V
Current - Max	160mA	mA
Lumens/Watt @ 150mA	127 lm/W	lm/W
CRI (Color Rendering Index)	80	—
Viewing Angle	120°	°
Package / Case	1113 (2835 Metric)	—
Size / Dimension	3.50mm × 2.80mm	mm
Height - Seated (Max)	0.75mm	mm
Thermal Resistance	25°C/W	°C/W
Mounting Type	Surface Mount	—
RoHS Status	RoHS Compliant	—
MSL (Moisture Sensitivity Level)	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of SPMWH1228FD5WATUS2 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Color: White, Neutral
CCT: 4000K
Flux @ 25°C, 150mA: 59lm (57–61lm range)
Current - Test: 150mA
Current - Max: 160mA
CRI: 80
Viewing Angle: 120°
Package / Case: 1113 (2835 Metric)
Size / Dimension: 3.50mm × 2.80mm
Height - Seated (Max): 0.75mm
Thermal Resistance: 25°C/W
Mounting Type: Surface Mount
RoHS Status: RoHS Compliant
MSL: 2A (4 Weeks)

Allowable Variation:

Voltage - Forward (Typ): 3.0V to 3.1V (minor tolerance acceptable within circuit design margins)
Lumens/Watt: 127–131 lm/W (efficiency improvement acceptable)
Series designation: LM281B to LM281BZ+ (product line evolution)
Product Status: Active substitutes acceptable for end-of-life parts

The three identified substitute parts (SPMWH3228FD5WAT0SC, SPMWH3228FD5WATKSC, SPMWH3228FD5WATMSC) meet all mandatory parameters and represent the LM281BZ+ series evolution with improved efficiency and active product status.

Parameter Comparison

Parameter	SPMWH1228FD5WATUS2 (Main)	SPMWH3228FD5WAT0SC	SPMWH3228FD5WATKSC	SPMWH3228FD5WATMSC
Series	LM281B	LM281BZ+	LM281BZ+	LM281BZ+
Product Status	Not For New Designs	Active	Active	Active
Color	White, Neutral	White, Neutral	White, Neutral	White, Neutral
CCT (K)	4000K	4000K	4000K	4000K
Flux @ 25°C, 150mA (lm)	59 (57–61)	59 (57–61)	59 (57–61)	59 (57–61)
Current - Test (mA)	150	150	150	150
Voltage - Forward Typ (V)	3.1	3.0	3.0	3.0
Lumens/Watt @ 150mA	127	131	131	131
CRI	80	80	80	80
Current - Max (mA)	160	160	160	160
Viewing Angle (°)	120	120	120	120
Package / Case	1113 (2835 Metric)	1113 (2835 Metric)	1113 (2835 Metric)	1113 (2835 Metric)
Size / Dimension (mm)	3.50 × 2.80	3.50 × 2.80	3.50 × 2.80	3.50 × 2.80
Height - Seated Max (mm)	0.75	0.75	0.75	0.75
Thermal Resistance (°C/W)	25	25	25	25
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
MSL	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)
Inventory Status	725 Pcs New Original	991 Pcs New Original	1165 Pcs New Original	970 Pcs New Original

Engineering Selection Recommendations

Primary Substitution Path:

The three LM281BZ+ variants (SPMWH3228FD5WAT0SC, SPMWH3228FD5WATKSC, SPMWH3228FD5WATMSC) are direct parametric equivalents for SPMWH1228FD5WATUS2. All three substitute parts carry Active product status, ensuring long-term supply availability and manufacturing support, whereas the original part is designated "Not For New Designs."

Compliance & Certification:

All substitute parts maintain identical RoHS compliance and MSL ratings (2A, 4 Weeks) as the original component. No additional handling or storage procedures are required. Thermal resistance, package dimensions, and mounting characteristics are fully preserved across all variants.

Electrical Performance:

The substitute parts operate at 3.0V typical forward voltage compared to 3.1V for the original part. This 0.1V reduction is within acceptable circuit design tolerance for LED driver circuits and results in improved luminous efficiency (131 lm/W versus 127 lm/W). Flux output, CRI, viewing angle, and maximum current ratings remain identical.

Selection Among Substitutes:

All three LM281BZ+ variants are electrically and mechanically identical. Selection should be based on packaging availability and supply chain logistics. SPMWH3228FD5WATKSC offers the highest inventory level (1165 Pcs), followed by SPMWH3228FD5WATMSC (970 Pcs) and SPMWH3228FD5WAT0SC (991 Pcs).

Frequently Asked Questions (FAQ)

Q: Can SPMWH3228FD5WAT0SC, SPMWH3228FD5WATKSC, or SPMWH3228FD5WATMSC be used as direct replacements for SPMWH1228FD5WATUS2?

A: Yes. All three substitute parts are parametric equivalents meeting identical electrical and mechanical specifications. The 0.1V forward voltage reduction (3.0V vs. 3.1V) and improved efficiency (131 vs. 127 lm/W) are within acceptable design margins for LED lighting circuits. No circuit redesign is required.

Q: What is the difference between the three substitute part numbers?

A: SPMWH3228FD5WAT0SC, SPMWH3228FD5WATKSC, and SPMWH3228FD5WATMSC are electrically and mechanically identical. The suffix variations (0SC, KSC, MSC) reflect different packaging or distribution channel designations. All three are LM281BZ+ series components with identical performance characteristics.

Q: Why is the original SPMWH1228FD5WATUS2 marked "Not For New Designs"?

A: This designation indicates the LM281B series has reached end-of-life status. Samsung has transitioned to the LM281BZ+ series (represented by the three substitute parts), which offers improved efficiency and active manufacturing support. Existing designs using SPMWH1228FD5WATUS2 should transition to one of the LM281BZ+ variants.

Q: Are there any thermal or mounting differences between the original and substitute parts?

A: No. Thermal resistance (25°C/W), package dimensions (3.50mm × 2.80mm), height (0.75mm maximum), and mounting type (surface mount) are identical across all parts. PCB layout and thermal design calculations require no modification.

Q: Do the substitute parts have the same moisture sensitivity requirements?

A: Yes. All substitute parts carry MSL rating 2A (4 Weeks), identical to the original component. Storage, handling, and reflow procedures remain unchanged.

Q: What is the impact of the 0.1V forward voltage difference on circuit design?

A: The reduction from 3.1V to 3.0V typical forward voltage results in lower power dissipation and improved efficiency. Standard LED driver circuits designed for 3.1V operation will function correctly with 3.0V components. No current limiting resistor or driver recalibration is required.

Q: Are all three substitute parts RoHS compliant?

A: Yes. SPMWH3228FD5WAT0SC, SPMWH3228FD5WATKSC, and SPMWH3228FD5WATMSC are all RoHS compliant, matching the compliance status of the original SPMWH1228FD5WATUS2.

Q: Which substitute part should be selected for new production orders?

A: Any of the three LM281BZ+ variants are acceptable. Selection should be based on inventory availability and supply chain preference. SPMWH3228FD5WATKSC currently offers the highest stock level (1165 Pcs).

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