SPMWH1228FD5WAQMS3 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WAQMS3 is a Samsung Semiconductor LM281B series cool white LED in 2835 metric package (1113 case). This surface mount LED operates at 5700K color temperature with 3.1V forward voltage and 150mA test current, delivering 64 lumens at 25°C with 138 lm/W efficiency and 80 CRI. The part is marked as Not For New Designs, making identification of equivalent alternatives necessary for ongoing production support and design continuity.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color / CCT	White, Cool / 5700K	—
Flux @ 25°C, 150mA	64 (62–66)	lm
Forward Voltage (Typ)	3.1	V
Test Current	150	mA
Maximum Current	160	mA
Lumens/Watt @ 150mA	138	lm/W
CRI	80	—
Viewing Angle	120	°
Package / Case	1113 (2835 Metric)	—
Size	3.50 × 2.80	mm
Height (Max)	0.75	mm
Thermal Resistance	25	°C/W
RoHS Status	Compliant	—
MSL	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD5WAQMS3 is determined by the following critical parameters:

Primary Substitution Criteria:

Color and CCT: White, Cool 5700K (exact match required)
Package / Case: 1113 (2835 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
CRI: 80 (exact match required)
Viewing Angle: 120° (exact match required)
Test Current: 150mA (exact match required)
Maximum Current: 160mA (exact match required)
Thermal Resistance: 25°C/W (exact match required)
RoHS Status: Compliant (exact match required)
MSL: 2A (4 Weeks) (exact match required)

Allowable Variation Parameters:

Forward Voltage (Typ): 3.0V to 3.1V (within 0.1V tolerance)
Flux @ 25°C: 62–67 lm range (within specification band)
Lumens/Watt: 138–142 lm/W (efficiency variation acceptable within series evolution)
Product Status: Active status preferred over Not For New Designs

Substitutes are classified into two categories:

Direct Manufacturer Substitutes: Parts with identical electrical performance and forward voltage (3.1V), representing direct pin-compatible replacements.

Parametric Equivalents: Parts with minor forward voltage variation (3.0V vs 3.1V) and improved efficiency (142 lm/W vs 138 lm/W), representing functional equivalents within the same package and optical specifications.

Parameter Comparison

Parameter	SPMWH1228FD5WAQMS3 (Main)	SPMWH1228FD5WAQMSC (Direct)	SPMWH3228FD5WAQ0SE (Parametric)	SPMWH3228FD5WAQKSE (Parametric)	SPMWH3228FD5WAQMSE (Parametric)
Series	LM281B	LM281B+	LM281BZ+	LM281BZ+	LM281BZ+
Product Status	Not For New Designs	Active	Active	Active	Active
Color / CCT	White, Cool / 5700K	White, Cool / 5700K	White, Cool / 5700K	White, Cool / 5700K	White, Cool / 5700K
Flux @ 25°C, 150mA	64 (62–66)	65 (63–67)	64 (62–66)	64 (62–66)	64 (62–66)
Forward Voltage (Typ)	3.1V	3.1V	3.0V	3.0V	3.0V
Test Current	150mA	150mA	150mA	150mA	150mA
Maximum Current	160mA	160mA	160mA	160mA	160mA
Lumens/Watt @ 150mA	138	140	142	142	142
CRI	80	80	80	80	80
Viewing Angle	120°	120°	120°	120°	120°
Package / Case	1113 (2835 Metric)	1113 (2835 Metric)	1113 (2835 Metric)	1113 (2835 Metric)	1113 (2835 Metric)
Size	3.50 × 2.80 mm	3.50 × 2.80 mm	3.50 × 2.80 mm	3.50 × 2.80 mm	3.50 × 2.80 mm
Height (Max)	0.75mm	0.75mm	0.75mm	0.75mm	0.75mm
Thermal Resistance	25°C/W	25°C/W	25°C/W	25°C/W	25°C/W
RoHS Status	Compliant	Compliant	Compliant	Compliant	Compliant
MSL	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Electrical Performance):

SPMWH1228FD5WAQMSC is the primary direct substitute. This LM281B+ variant maintains 3.1V forward voltage identical to the main part, with marginally improved flux output (65 lm vs 64 lm) and efficiency (140 lm/W vs 138 lm/W). Product status is Active, eliminating obsolescence risk. All mechanical, thermal, and compliance parameters are identical. This part is suitable for direct PCB substitution without circuit modification.

For Functional Equivalence (Minor Forward Voltage Variation):

SPMWH3228FD5WAQ0SE, SPMWH3228FD5WAQKSE, and SPMWH3228FD5WAQMSE are LM281BZ+ parametric equivalents with 3.0V forward voltage (0.1V lower than main part) and improved efficiency (142 lm/W). These parts are functionally equivalent within the 2835 package and 5700K specification. The 0.1V forward voltage reduction results in approximately 15mW lower power dissipation at 150mA test current. All three variants are Active status with identical optical and thermal characteristics. Circuit design must accommodate the lower forward voltage; applications with tight voltage regulation or series-connected LED strings require verification of total voltage budget.

Compliance and Certification:

All substitute parts maintain RoHS Compliance and MSL 2A (4 Weeks) moisture sensitivity level, matching the main part. ECCN and HTSUS classifications are identical across all variants.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD5WAQMSC be used as a direct replacement for SPMWH1228FD5WAQMS3 without PCB modification?

A: Yes. SPMWH1228FD5WAQMSC is a direct substitute with identical forward voltage (3.1V), package (2835), and all optical parameters. No circuit modification is required. The part is pin-compatible and electrically interchangeable.

Q: What is the difference between the direct substitute and parametric equivalents?

A: The direct substitute (SPMWH1228FD5WAQMSC) maintains 3.1V forward voltage. Parametric equivalents (SPMWH3228FD5WAQ0SE, SPMWH3228FD5WAQKSE, SPMWH3228FD5WAQMSE) operate at 3.0V with improved efficiency (142 lm/W vs 138 lm/W). The 0.1V difference requires circuit verification in applications with series-connected LEDs or regulated current sources with tight voltage margins.

Q: Are all substitute parts in the same 2835 package?

A: Yes. All substitute parts use the 1113 (2835 Metric) package with identical dimensions (3.50 × 2.80 mm) and maximum height (0.75 mm). PCB footprints are identical.

Q: What is the inventory status of substitute parts?

A: SPMWH1228FD5WAQMSC: 1047 pcs. SPMWH3228FD5WAQ0SE: 883 pcs. SPMWH3228FD5WAQKSE: 985 pcs. SPMWH3228FD5WAQMSE: 971 pcs. All are listed as New Original In Stock.

Q: Do the parametric equivalents have different thermal characteristics?

A: No. All substitute parts maintain 25°C/W thermal resistance identical to the main part. Thermal management design does not require modification.

Q: Why is the main part marked "Not For New Designs"?

A: SPMWH1228FD5WAQMS3 is in the LM281B series, which has been superseded by LM281B+ and LM281BZ+ variants. Active status substitutes are recommended for new designs to ensure long-term availability and support.

Q: Can parametric equivalents be mixed with the main part in the same assembly?

A: Mixing is not recommended in series-connected LED strings due to the 0.1V forward voltage difference. In parallel configurations with individual current-limiting resistors or constant-current drivers, mixing is acceptable. Verify circuit design for voltage budget compatibility.

Q: Are all parts RoHS compliant?

A: Yes. All parts including the main part and all substitutes are RoHS Compliant with identical MSL 2A (4 Weeks) moisture sensitivity level.

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