SPMWH1228FD7WATKS3 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD7WATKS3 is a Samsung Semiconductor LM281B series neutral white LED (4000K) in 2835 metric surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status in Samsung's product portfolio. The part delivers 58 lumens at 25°C under 150mA test current with a forward voltage of 3.1V and 90 CRI. Due to its discontinued design status, equivalent substitute parts are available to maintain compatibility in existing production lines and legacy system support.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color	White, Neutral	—
CCT (Correlated Color Temperature)	4000K	K
Flux @ 25°C, 150mA	58	lm
Forward Voltage (Vf) Typical	3.1	V
Test Current	150	mA
Maximum Current	160	mA
Lumens per Watt @ 150mA	125	lm/W
CRI (Color Rendering Index)	90	—
Viewing Angle	120	°
Package / Case	1113 (2835 Metric)	—
Size / Dimension	3.50 × 2.80	mm
Height - Seated (Max)	0.75	mm
Thermal Resistance	17	°C/W
Mounting Type	Surface Mount	—
RoHS Status	RoHS Compliant	—
MSL (Moisture Sensitivity Level)	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD7WATKS3 is determined by the following critical parameters:

Mandatory Matching Parameters:

Color: White, Neutral
CCT: 4000K
Package / Case: 1113 (2835 Metric)
Forward Voltage (Vf): 3.1V
Test Current: 150mA
Maximum Current: 160mA
Viewing Angle: 120°
CRI: 90
Mounting Type: Surface Mount
RoHS Compliance: Required
MSL: 2A (4 Weeks)

Allowable Variation Parameters:

Flux @ 25°C: Range 56–59 lm (specification tolerance)
Lumens per Watt: Variation acceptable within series performance envelope
Thermal Resistance: Variation acceptable (17°C/W to 25°C/W)
Product Status: Active or Not For New Designs (both acceptable for substitution)
Series: LM281B or LM281B+ (same base product family)

The substitute parts SPMWH1228FD7WAT0S3, SPMWH1228FD7WATMS3, and SPMWH1228FD7WATKSC maintain electrical and mechanical compatibility through identical color, CCT, package, voltage, current, and viewing angle specifications. Variations in thermal resistance and luminous flux fall within acceptable engineering tolerances for this product category.

Parameter Comparison

Parameter	SPMWH1228FD7WATKS3 (Main)	SPMWH1228FD7WAT0S3	SPMWH1228FD7WATMS3	SPMWH1228FD7WATKSC
Series	LM281B	LM281B	LM281B	LM281B+
Product Status	Not For New Designs	Not For New Designs	Not For New Designs	Active
Color	White, Neutral	White, Neutral	White, Neutral	White, Neutral
CCT (K)	4000	4000	4000	4000
Flux @ 25°C, 150mA (lm)	58 (56–59)	58 (56–59)	58 (56–59)	55 (53–56)
Forward Voltage (Vf) Typ (V)	3.1	3.1	3.1	3.1
Test Current (mA)	150	150	150	150
Maximum Current (mA)	160	160	160	160
Lumens per Watt @ 150mA	125	125	125	118
CRI	90	90	90	90
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)	17	17	17	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 (Pcs)	1098	5492	1112	818

Engineering Selection Recommendations

SPMWH1228FD7WAT0S3 and SPMWH1228FD7WATMS3 are direct parametric equivalents to the main part SPMWH1228FD7WATKS3. All three parts share identical electrical specifications (3.1V, 150mA, 58 lm @ 25°C, 125 lm/W), mechanical dimensions (2835 package, 3.50 × 2.80 mm), and thermal characteristics (17°C/W). Both substitute parts maintain the same LM281B series designation and "Not For New Designs" status. Selection between these three parts is based on inventory availability and supply chain logistics, as they are functionally interchangeable.

SPMWH1228FD7WATKSC is an LM281B+ series variant with Active product status. This part differs in two parameters: luminous flux (55 lm versus 58 lm at 25°C) and thermal resistance (25°C/W versus 17°C/W). The reduced luminous flux represents a 5% decrease in light output, and the higher thermal resistance indicates reduced heat dissipation efficiency. Selection of SPMWH1228FD7WATKSC is appropriate when Active product status is required for new production qualification or when the reduced thermal performance is acceptable for the application. The part maintains full electrical compatibility (3.1V, 150mA, 120° viewing angle, 90 CRI) and identical mechanical packaging.

All four parts are RoHS Compliant and carry MSL 2A (4 Weeks) moisture sensitivity classification, meeting standard industrial compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD7WAT0S3 or SPMWH1228FD7WATMS3 be used as direct replacements for SPMWH1228FD7WATKS3?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (3.1V forward voltage, 150mA test current, 58 lm flux at 25°C), mechanical dimensions (2835 package, 3.50 × 2.80 mm), and thermal characteristics (17°C/W). They are functionally interchangeable in all applications where the main part is specified.

Q: What is the difference between SPMWH1228FD7WATKSC and the other substitute parts?

A: SPMWH1228FD7WATKSC is an LM281B+ series part with Active product status, whereas the main part and other substitutes are LM281B series with "Not For New Designs" status. The LM281B+ variant produces 55 lm (versus 58 lm) and has higher thermal resistance (25°C/W versus 17°C/W). Electrical compatibility (3.1V, 150mA, 120° viewing angle, 90 CRI) and package dimensions remain identical.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All parts are supplied in Tape & Reel (TR) packaging and use the 1113 (2835 Metric) surface mount package with identical dimensions (3.50 × 2.80 mm, 0.75 mm seated height). They are compatible with standard SMT assembly equipment and processes.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the part has reached end-of-life in Samsung's product roadmap and is no longer recommended for new product development. However, the part remains available for existing production support and legacy system maintenance. SPMWH1228FD7WATKSC carries Active status, making it suitable for new designs requiring this LED specification.

Q: Do all parts meet RoHS compliance requirements?

A: Yes. All four parts (SPMWH1228FD7WATKS3, SPMWH1228FD7WAT0S3, SPMWH1228FD7WATMS3, and SPMWH1228FD7WATKSC) are RoHS Compliant and carry MSL 2A (4 Weeks) moisture sensitivity classification.

Q: How does thermal resistance affect part selection?

A: Thermal resistance (17°C/W for LM281B parts, 25°C/W for LM281B+) determines heat dissipation efficiency. Lower thermal resistance indicates better heat transfer from the LED junction to the PCB. Applications with stringent thermal management requirements should prioritize parts with 17°C/W thermal resistance. Applications with relaxed thermal constraints can accommodate the 25°C/W variant.

Q: What is the luminous flux tolerance range?

A: The specified flux range is 56–59 lm at 25°C under 150mA test current. SPMWH1228FD7WATKS3, SPMWH1228FD7WAT0S3, and SPMWH1228FD7WATMS3 all specify 58 lm (within tolerance). SPMWH1228FD7WATKSC specifies 55 lm (53–56 lm range), representing a lower performance bin within the LM281B+ series.

Q: Are there any restrictions on viewing angle or color rendering?

A: No. All substitute parts maintain 120° viewing angle and 90 CRI (Color Rendering Index), ensuring consistent optical performance and color accuracy across all variants.

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