SPMWH1228FD5WAPMS2 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WAPMS2 is a Samsung Semiconductor LM281B cool white LED in 2835 metric package (1113 case). This surface mount LED operates at 3.1V forward voltage with 150mA test current, delivering 59 lumens at 25°C and 127 lm/W efficiency. The product is marked as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and new design initiatives. The part is RoHS compliant with 2A moisture sensitivity level and is currently available with 793 pieces in stock.

Key Parameters

Parameter	Value	Unit
Series	LM281B	—
Color	White, Cool	—
CCT (Correlated Color Temperature)	6500K	K
Flux @ 25°C, 150mA	59 (57–61)	lm
Voltage - Forward (Vf) Typical	3.1	V
Current - Test	150	mA
Current - Maximum	160	mA
Lumens/Watt @ 150mA	127	lm/W
CRI (Color Rendering Index)	80	—
Viewing Angle	120	°
Package / Case	1113 (2835 Metric)	—
Size / Dimension	3.50 × 2.80	mm
Height - Seated (Max)	0.75	mm
Thermal Resistance	25	°C/W
Mounting Type	Surface Mount	—
RoHS Status	RoHS Compliant	—
MSL (Moisture Sensitivity Level)	2A (4 Weeks)	—

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD5WAPMS2 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Color: White, Cool (6500K CCT)
Package / Case: 1113 (2835 Metric)
Mounting Type: Surface Mount
Viewing Angle: 120°
CRI: 80
Current - Test: 150mA
Current - Maximum: 160mA
Thermal Resistance: 25°C/W
RoHS Compliance: Required
MSL: 2A (4 Weeks)

Acceptable Parameter Variance:

Voltage - Forward (Vf): 3.0V to 3.1V (typical)
Flux @ 25°C: 57–62 lumens (within specification range)
Lumens/Watt: 127–131 lm/W (efficiency improvement acceptable)
Product Status: Active preferred over Not For New Designs

Substitutes are grouped into two categories: Direct Manufacturer Substitutes (same base product number SPMWH1228 with improved series designation) and Parametric Equivalents (alternative base product number SPMWH3228 with LM281BZ+ series, meeting all electrical and mechanical requirements).

Parameter Comparison

Parameter	SPMWH1228FD5WAPMS2 (Main)	SPMWH1228FD5WAPMSA (Direct Sub)	SPMWH3228FD5WAP0SC (Parametric Equiv)	SPMWH3228FD5WAPKSC (Parametric Equiv)	SPMWH3228FD5WAPMSC (Parametric Equiv)
Series	LM281B	LM281B+	LM281BZ+	LM281BZ+	LM281BZ+
Product Status	Not For New Designs	Active	Active	Active	Active
Color	White, Cool	White, Cool	White, Cool	White, Cool	White, Cool
CCT (K)	6500	6500	6500	6500	6500
Flux @ 25°C (lm)	59 (57–61)	60 (58–62)	59 (57–61)	59 (57–61)	59 (57–61)
Vf Typical (V)	3.1	3.1	3.0	3.0	3.0
Current - Test (mA)	150	150	150	150	150
Current - Max (mA)	160	160	160	160	160
Lumens/Watt @ 150mA	127	129	131	131	131
CRI	80	80	80	80	80
Viewing Angle (°)	120	120	120	120	120
Package / Case	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)	1113 (2835)
Size (mm)	3.50 × 2.80	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	0.75
Thermal Resistance (°C/W)	25	25	25	25	25
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
MSL	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)
Inventory (Pcs)	793	885	1114	614	973

Engineering Selection Recommendations

For Existing Designs Using SPMWH1228FD5WAPMS2:

The SPMWH1228FD5WAPMSA is the primary direct substitute. Both parts share the same base product number (SPMWH1228) and identical mechanical and thermal specifications. The LM281B+ series in SPMWH1228FD5WAPMSA is an active product with improved luminous efficiency (129 lm/W versus 127 lm/W) and slightly higher flux output (60 lm versus 59 lm). Forward voltage remains at 3.1V, ensuring circuit compatibility without modification. This part is recommended for immediate substitution in production environments.

For New Designs or Long-Term Supply:

The parametric equivalent parts (SPMWH3228FD5WAP0SC, SPMWH3228FD5WAPKSC, SPMWH3228FD5WAPMSC) utilize the LM281BZ+ series with base product number SPMWH3228. All three maintain identical package dimensions, thermal characteristics, and optical specifications (120° viewing angle, 80 CRI, 6500K CCT). The primary difference is forward voltage: 3.0V typical versus 3.1V in the main part. This 0.1V reduction results in lower power dissipation and improved efficiency (131 lm/W). Circuit designs must accommodate the lower forward voltage through resistor or current source adjustment. All parametric equivalents are active products with robust inventory availability (614–1114 pieces).

Compliance and Certification:

All substitute parts maintain RoHS compliance and 2A moisture sensitivity level (4 weeks), matching the original part's environmental and regulatory requirements. No additional handling or storage procedures are required.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD5WAPMSA be used as a direct drop-in replacement for SPMWH1228FD5WAPMS2?

A: Yes. Both parts have identical forward voltage (3.1V), current ratings (150mA test, 160mA maximum), package dimensions (3.50 × 2.80 mm, 0.75 mm height), and thermal resistance (25°C/W). The LM281B+ series offers improved efficiency without requiring circuit modification.

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

A: Direct substitutes (SPMWH1228FD5WAPMSA) share the same base product number and forward voltage as the original part. Parametric equivalents (SPMWH3228 series) use a different base product number and operate at 3.0V forward voltage instead of 3.1V. Parametric equivalents require circuit adjustment to accommodate the lower voltage but offer higher efficiency.

Q: Can parametric equivalents be used without circuit modification?

A: Parametric equivalents operate at 3.0V typical forward voltage, 0.1V lower than the original 3.1V part. If the circuit is designed with tight voltage tolerance or uses a fixed current source, adjustment may be required. If the circuit uses a resistor-based current limiting design with adequate headroom, substitution may be possible without modification. Circuit analysis is required to confirm compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (SPMWH1228FD5WAPMSA, SPMWH3228FD5WAP0SC, SPMWH3228FD5WAPKSC, SPMWH3228FD5WAPMSC) are RoHS compliant with 2A moisture sensitivity level (4 weeks), matching the original part's compliance status.

Q: What is the inventory status of substitute parts?

A: SPMWH1228FD5WAPMSA (direct substitute) has 885 pieces in stock. Parametric equivalents have the following availability: SPMWH3228FD5WAP0SC (1114 pieces), SPMWH3228FD5WAPKSC (614 pieces), SPMWH3228FD5WAPMSC (973 pieces). All parts are listed as new original stock.

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

A: The SPMWH1228FD5WAPMS2 LM281B series is in mature phase. Samsung recommends using active product series (LM281B+ or LM281BZ+) for new designs to ensure long-term supply continuity and access to product improvements.

Q: Are the optical characteristics (color, CRI, viewing angle) identical across all substitutes?

A: Yes. All substitute parts maintain 6500K CCT (cool white), 80 CRI, and 120° viewing angle. Flux output at 25°C and 150mA is within specification range (57–62 lumens) for all parts, with no perceptible color or brightness difference in typical applications.

Q: What is the thermal resistance specification, and does it differ between parts?

A: All parts, including the original and all substitutes, have thermal resistance of 25°C/W. This specification is identical across the entire product group and does not require thermal design modification when substituting.

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