SPMWH1228FD5WARMS4 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WARMS4 is a Samsung Semiconductor LM281B series cool white LED in 2835 metric package (1113 case code) designed for surface mount applications. This component operates at 5000K color temperature with a forward voltage of 3.1V and test current of 150mA, delivering 69 lumens at 25°C with 148 lm/W efficiency and 80 CRI.

The SPMWH1228FD5WARMS4 carries a "Not For New Designs" product status. Identifying equivalent and substitute parts is necessary to support existing production lines, maintenance requirements, and design continuity where this legacy component remains specified.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color / CCT	White, Cool / 5000K	—
Flux @ 25°C, 150mA	69 (67–71)	lm
Forward Voltage (Typ)	3.1	V
Test Current	150	mA
Maximum Current	160	mA
Lumens/Watt @ 150mA	148	lm/W
CRI	80	—
Viewing Angle	120	°
Package / Case	1113 (2835 Metric)	—
Mounting Type	Surface Mount	—
Size	3.50 × 2.80 × 0.75	mm
Thermal Resistance	25	°C/W
RoHS Status	RoHS Compliant	—
MSL	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SPMWH1228FD5WARMS4 is determined by the following critical parameters:

Primary Substitution Criteria:

Color and CCT: White, Cool 5000K (exact match required)
Package / Case: 1113 (2835 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Flux @ 25°C, 150mA: 69 lm (67–71 lm range acceptable)
Forward Voltage (Typ): 3.1V or 3.0V (within typical LED tolerance)
Test Current: 150mA (exact match required)
Maximum Current: 160mA (exact match required)
Viewing Angle: 120° (exact match required)
CRI: 80 (exact match required)

Secondary Considerations:

Series designation (LM281B vs. LM281B+ vs. LM281BZ+): Indicates product generation and status
Product Status: Active vs. Not For New Designs
Lumens/Watt efficiency: 148–153 lm/W range acceptable
RoHS Compliance and MSL rating: Must match or exceed

Substitute parts are grouped into two categories:

Category A – Direct Parametric Equivalents (LM281B Series, Not For New Designs): Parts maintaining identical electrical and mechanical specifications with the same product status.

Category B – Parametric Equivalents with Enhanced Status (LM281B+ and LM281BZ+ Series, Active Status): Parts with identical or superior electrical performance, active product status, and forward compatibility. These represent current-generation alternatives suitable for design continuity.

Parameter Comparison

Part Number	Series	Status	Vf (Typ) [V]	Flux @ 25°C [lm]	lm/W	Inventory [Pcs]
SPMWH1228FD5WARMS4	LM281B	Not For New Designs	3.1	69	148	35193
SPMWH1228FD5WAR0S4	LM281B	Not For New Designs	3.1	69	148	36790
SPMWH1228FD5WAR0SE	LM281B+	Active	3.1	69	148	1029
SPMWH1228FD5WARKSE	LM281B+	Active	3.1	69	148	1000100
SPMWH1228FD5WARMSE	LM281B+	Active	3.1	69	148	827
SPMWH1228FD5WARUSE	LM281B+	Active	3.0	69	153	620
SPMWH3228FD5WAR0SG	LM281BZ+	Active	3.0	69	153	710
SPMWH3228FD5WARKSG	LM281BZ+	Active	3.0	69	153	996
SPMWH3228FD5WARMSG	LM281BZ+	Active	3.0	69	153	710

Engineering Selection Recommendations

For Existing Production Support (Legacy Designs):

SPMWH1228FD5WAR0S4 is the primary direct equivalent. Both parts carry "Not For New Designs" status and maintain identical electrical specifications (3.1V, 69 lm, 148 lm/W). Selection between these two legacy parts should be based on inventory availability and supply chain logistics.

For Design Continuity and Forward Compatibility:

The LM281B+ series (SPMWH1228FD5WAR0SE, SPMWH1228FD5WARKSE, SPMWH1228FD5WARMSE) represents the current-generation equivalent with Active product status. These parts maintain 3.1V forward voltage and identical photometric output (69 lm, 148 lm/W), ensuring direct functional compatibility while providing access to active product support and extended availability.

SPMWH1228FD5WARKSE offers the highest inventory level (1,000,100 pcs) among LM281B+ alternatives, supporting high-volume production requirements.

For Enhanced Efficiency Applications:

SPMWH1228FD5WARUSE (LM281B+, 3.0V, 153 lm/W) and the LM281BZ+ series (SPMWH3228FD5WAR0SG, SPMWH3228FD5WARKSG, SPMWH3228FD5WARMSG) deliver improved luminous efficacy at reduced forward voltage. These parts are suitable for applications where power efficiency optimization is a design objective, provided circuit design accommodates the 3.0V operating point.

Compliance Considerations:

All substitute parts maintain RoHS Compliance and MSL 2A (4 Weeks) ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q1: Can SPMWH1228FD5WAR0S4 be used as a direct replacement for SPMWH1228FD5WARMS4?

Yes. Both parts are LM281B series LEDs with identical electrical specifications: 3.1V forward voltage, 69 lm output at 25°C and 150mA, 148 lm/W efficiency, 80 CRI, 120° viewing angle, and 1113 (2835 metric) package. The parts differ only in manufacturing lot designation. Both carry "Not For New Designs" status.

Q2: What is the difference between LM281B, LM281B+, and LM281BZ+ series?

LM281B represents the legacy product line with "Not For New Designs" status. LM281B+ and LM281BZ+ are current-generation series with Active product status, indicating ongoing manufacturing support and availability. All three series maintain the same 5000K color temperature, 69 lm output, 120° viewing angle, and 1113 (2835 metric) package. LM281B+ variants are available at 3.1V or 3.0V forward voltage. LM281BZ+ variants operate at 3.0V with improved efficiency (153 lm/W).

Q3: Can I substitute a 3.0V part (SPMWH1228FD5WARUSE) for the 3.1V main part (SPMWH1228FD5WARMS4)?

Substitution is possible if circuit design accommodates the 0.1V forward voltage difference. The 3.0V part delivers identical luminous output (69 lm) with improved efficiency (153 lm/W vs. 148 lm/W). Circuit validation is required to confirm compatibility with the lower operating voltage.

Q4: Are all substitute parts available in Tape & Reel (TR) packaging?

SPMWH1228FD5WARMS4, SPMWH1228FD5WAR0S4, SPMWH1228FD5WAR0SE, SPMWH1228FD5WARKSE, SPMWH1228FD5WARMSE, and SPMWH1228FD5WARUSE are specified as Tape & Reel (TR). SPMWH3228FD5WAR0SG, SPMWH3228FD5WARKSG, and SPMWH3228FD5WARMSG do not specify packaging designation in the provided data.

Q5: Which substitute part offers the best inventory availability?

SPMWH1228FD5WARKSE (LM281B+) provides the highest inventory level at 1,000,100 pcs, supporting high-volume production and extended lead-time protection.

Q6: Do all parts meet RoHS compliance requirements?

All substitute parts listed carry RoHS Compliant status, meeting environmental and regulatory requirements for standard manufacturing environments.

Q7: What is the significance of the MSL 2A (4 Weeks) rating?

MSL 2A indicates Moisture Sensitivity Level 2A with a 4-week floor life after bag opening. Parts must be stored in dry conditions and used within the specified timeframe to prevent moisture-induced failures during reflow soldering.

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