SPMWH1228FD5WARUS2 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WARUS2 is a Samsung Semiconductor LM281B cool white LED in 2835 metric package (1113 case code) designed for surface mount lighting applications. This part operates at 5000K color temperature with 61 lumens at 25°C and 150mA test current. The product is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent substitute parts are available from Samsung's active product lines, including the LM281B+ and LM281BZ+ series, which maintain electrical and mechanical compatibility while offering active product support and continued availability.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color	White, Cool	—
CCT (Correlated Color Temperature)	5000K	K
Flux @ 25°C, 150mA	61 lm (59–63 lm range)	lm
Forward Voltage (Vf) Typical	3.1V	V
Test Current	150mA	mA
Maximum Current	160mA	mA
Lumens per Watt @ 150mA	131 lm/W	lm/W
CRI (Color Rendering Index)	80	—
Viewing Angle	120°	degrees
Package / Case	1113 (2835 Metric)	—
Mounting Type	Surface Mount	—
Size / Dimension	3.50mm L × 2.80mm W	mm
Height - Seated (Max)	0.75mm	mm
Thermal Resistance	25°C/W	°C/W
RoHS Status	RoHS Compliant	—
MSL (Moisture Sensitivity Level)	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD5WARUS2 is determined by strict equivalence across the following critical parameters:

Group 1: LM281B+ Series (Direct Electrical & Mechanical Equivalents)

Color: White, Cool 5000K
Flux @ 25°C, 150mA: 61 lm (59–63 lm range)
Forward Voltage (Vf): 3.1V
Test Current: 150mA
Maximum Current: 160mA
Lumens/Watt: 131 lm/W
CRI: 80
Viewing Angle: 120°
Package: 1113 (2835 Metric)
Dimensions: 3.50mm × 2.80mm × 0.75mm (max height)
Thermal Resistance: 25°C/W
RoHS Compliant, MSL 2A

Parts in this group: SPMWH1228FD5WAR0SA, SPMWH1228FD5WARKSA, SPMWH1228FD5WARMSA

Group 2: LM281BZ+ Series (Electrical Variant with Lower Forward Voltage)

Color: White, Cool 5000K
Flux @ 25°C, 150mA: 61 lm (59–63 lm range)
Forward Voltage (Vf): 3.0V (0.1V lower than main part)
Test Current: 150mA
Maximum Current: 160mA
Lumens/Watt: 136 lm/W (5 lm/W higher efficiency)
CRI: 80
Viewing Angle: 120°
Package: 1113 (2835 Metric)
Dimensions: 3.50mm × 2.80mm × 0.75mm (max height)
Thermal Resistance: 25°C/W
RoHS Compliant, MSL 2A

Parts in this group: SPMWH3228FD5WAR0SC, SPMWH3228FD5WARKSC, SPMWH3228FD5WARMSC

All substitute parts maintain identical mechanical compatibility, package footprint, and thermal characteristics. Group 2 parts offer reduced forward voltage and improved luminous efficacy while preserving all other electrical parameters.

Parameter Comparison

Parameter	SPMWH1228FD5WARUS2 (Main)	SPMWH1228FD5WAR0SA	SPMWH1228FD5WARKSA	SPMWH1228FD5WARMSA	SPMWH3228FD5WAR0SC	SPMWH3228FD5WARKSC	SPMWH3228FD5WARMSC
Series	LM281B	LM281B+	LM281B+	LM281B+	LM281BZ+	LM281BZ+	LM281BZ+
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active
Color / CCT	White, Cool 5000K	White, Cool 5000K	White, Cool 5000K	White, Cool 5000K	White, Cool 5000K	White, Cool 5000K	White, Cool 5000K
Flux @ 25°C, 150mA	61 lm (59–63)	61 lm (59–63)	61 lm (59–63)	61 lm (59–63)	61 lm (59–63)	61 lm (59–63)	61 lm (59–63)
Forward Voltage (Vf)	3.1V	3.1V	3.1V	3.1V	3.0V	3.0V	3.0V
Test Current	150mA	150mA	150mA	150mA	150mA	150mA	150mA
Maximum Current	160mA	160mA	160mA	160mA	160mA	160mA	160mA
Lumens/Watt @ 150mA	131 lm/W	131 lm/W	131 lm/W	131 lm/W	136 lm/W	136 lm/W	136 lm/W
CRI	80	80	80	80	80	80	80
Viewing Angle	120°	120°	120°	120°	120°	120°	120°
Package / Case	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)
Dimensions	3.50 × 2.80mm	3.50 × 2.80mm	3.50 × 2.80mm	3.50 × 2.80mm	3.50 × 2.80mm	3.50 × 2.80mm	3.50 × 2.80mm
Height (Max)	0.75mm	0.75mm	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	25°C/W	25°C/W
RoHS Status	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
MSL	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)

Engineering Selection Recommendations

For Direct Replacement (Recommended for Existing Designs)

The LM281B+ series parts (SPMWH1228FD5WAR0SA, SPMWH1228FD5WARKSA, SPMWH1228FD5WARMSA) provide direct electrical and mechanical substitution for SPMWH1228FD5WARUS2. These parts maintain identical forward voltage (3.1V), luminous flux (61 lm), and efficiency (131 lm/W). All three variants are Active products with RoHS compliance and identical MSL ratings. Selection among these three parts depends on packaging and distribution channel availability. Current inventory levels are: SPMWH1228FD5WARKSA (1118 pcs), SPMWH1228FD5WAR0SA (799 pcs), and SPMWH1228FD5WARMSA (716 pcs).

For Optimized Performance (New Designs)

The LM281BZ+ series parts (SPMWH3228FD5WAR0SC, SPMWH3228FD5WARKSC, SPMWH3228FD5WARMSC) offer improved luminous efficacy at 136 lm/W with reduced forward voltage of 3.0V. These parts maintain identical flux output (61 lm), CRI (80), viewing angle (120°), and package dimensions. The 0.1V lower forward voltage reduces power dissipation and heat generation while improving overall system efficiency. All three variants are Active products with full RoHS compliance. Current inventory levels are: SPMWH3228FD5WAR0SC (1082 pcs), SPMWH3228FD5WARKSC (859 pcs), and SPMWH3228FD5WARMSC (799 pcs).

Compliance & Certification

All substitute parts carry identical RoHS compliance status and MSL 2A (4 Weeks) moisture sensitivity ratings. Thermal resistance remains constant at 25°C/W across all variants, ensuring equivalent thermal management performance in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD5WAR0SA replace SPMWH1228FD5WARUS2 without circuit modification?

A: Yes. SPMWH1228FD5WAR0SA is a direct parametric equivalent with identical forward voltage (3.1V), test current (150mA), flux output (61 lm), and package dimensions (3.50 × 2.80 × 0.75mm). No circuit changes are required.

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

A: The primary difference is forward voltage and efficiency. LM281B+ operates at 3.1V with 131 lm/W efficiency. LM281BZ+ operates at 3.0V with 136 lm/W efficiency. Both deliver identical 61 lm flux at 150mA test current and use the same 2835 package. The lower forward voltage of LM281BZ+ reduces power consumption by approximately 3.2% at constant current.

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

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

Q: What does "Not For New Designs" mean for the main part?

A: This designation indicates the SPMWH1228FD5WARUS2 has reached end-of-life status and Samsung no longer recommends it for new product development. Active substitute parts from the LM281B+ and LM281BZ+ series should be used for new designs to ensure long-term availability and support.

Q: Can I use LM281BZ+ parts in a circuit designed for LM281B?

A: LM281BZ+ parts are compatible with circuits designed for LM281B when the circuit can tolerate 0.1V lower forward voltage. At 150mA test current, LM281BZ+ operates at 3.0V versus 3.1V for LM281B. This 3.2% voltage reduction is typically acceptable in LED driver circuits with adequate headroom. Verify your specific driver circuit specifications before substitution.

Q: What is the viewing angle specification?

A: All parts in this family maintain a 120° viewing angle, indicating the half-angle at which luminous intensity drops to 50% of peak. This specification is identical across main and substitute parts.

Q: Are moisture sensitivity precautions identical for all parts?

A: Yes. All parts carry MSL 2A (4 Weeks) rating, requiring storage at ≤30°C and ≤60% relative humidity. Unopened packages remain valid for 4 weeks under these conditions. Handling and reflow procedures are identical across all variants.

Q: Which substitute part offers the best value for cost-sensitive applications?

A: Among LM281B+ variants, selection depends on your distributor's pricing and availability. All three (SPMWH1228FD5WAR0SA, SPMWH1228FD5WARKSA, SPMWH1228FD5WARMSA) are electrically and mechantrically identical. For efficiency-optimized applications, LM281BZ+ series provides 5 lm/W higher efficiency at 3.0V forward voltage.

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