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SPMWH1228FD5WARMS3 LED Equivalent & Substitute Parts
Part Overview
The SPMWH1228FD5WARMS3 is a Samsung Semiconductor LM281B series cool white LED in 2835 metric package (1113 case). This surface mount LED operates at 5000K color temperature with 150mA test current and 3.1V forward voltage. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that maintain electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Series | LM281B | — |
| Color / CCT | White, Cool / 5000K | — |
| Flux @ 25°C, 150mA | 65 (63–67) | lm |
| Forward Voltage (Typ) | 3.1 | V |
| Test Current | 150 | mA |
| Maximum Current | 160 | mA |
| Lumens/Watt @ 150mA | 140 | 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 |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS Compliant | — |
| MSL | 2A (4 Weeks) | — |
Substitute Part Grouping Explanation
Substitute parts are grouped into two categories based on electrical and mechanical compatibility:
Category 1: LM281B Series (Same Generation) Parts SPMWH1228FD5WAR0S3, SPMWH1228FD5WARMSC, and SPMWH1228FD5WAR0SC maintain identical electrical specifications: 5000K CCT, 65 lm @ 25°C/150mA, 3.1V forward voltage, 140 lm/W efficiency, 80 CRI, 120° viewing angle, and 2835 package dimensions. These parts differ only in packaging code suffix and RoHS certification variant (RoHS3 vs. RoHS Compliant). Product status varies: SPMWH1228FD5WAR0S3 is "Not For New Designs"; SPMWH1228FD5WARMSC and SPMWH1228FD5WAR0SC are "Active."
Category 2: LM281B+ Series (Enhanced Generation) Parts SPMWH1228FD5WARKSC and SPMWH1228FD5WARMSC represent the LM281B+ variant with identical electrical performance to Category 1 but "Active" product status. These are direct functional replacements.
Category 3: LM281BZ+ Series (Alternative Voltage) Parts SPMWH3228FD5WAR0SE, SPMWH3228FD5WARKSE, and SPMWH3228FD5WARMSE use the LM281BZ+ series with reduced forward voltage (3.0V vs. 3.1V) and increased efficiency (144 lm/W vs. 140 lm/W). All other parameters remain identical. These parts are "Active" status.
Substitution is determined by: color/CCT match (5000K), flux output (65 lm @ 150mA), viewing angle (120°), package type (2835), and mechanical dimensions. Forward voltage tolerance and efficiency differences define secondary selection criteria.
Parameter Comparison
| Part Number | Series | Status | Vf (V) | Flux @ 25°C (lm) | lm/W | Inventory (Pcs) | RoHS |
|---|---|---|---|---|---|---|---|
| SPMWH1228FD5WARMS3 | LM281B | Not For New Designs | 3.1 | 65 | 140 | 1063 | RoHS Compliant |
| SPMWH1228FD5WAR0S3 | LM281B | Not For New Designs | 3.1 | 65 | 140 | 1732 | ROHS3 Compliant |
| SPMWH1228FD5WAR0SC | LM281B+ | Active | 3.1 | 65 | 140 | 984 | RoHS Compliant |
| SPMWH1228FD5WARKSC | LM281B+ | Active | 3.1 | 65 | 140 | 701 | RoHS Compliant |
| SPMWH1228FD5WARMSC | LM281B+ | Active | 3.1 | 65 | 140 | 1039 | RoHS Compliant |
| SPMWH3228FD5WAR0SE | LM281BZ+ | Active | 3.0 | 65 | 144 | 924 | RoHS Compliant |
| SPMWH3228FD5WARKSE | LM281BZ+ | Active | 3.0 | 65 | 144 | 1100 | RoHS Compliant |
| SPMWH3228FD5WARMSE | LM281BZ+ | Active | 3.0 | 65 | 144 | 941 | RoHS Compliant |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications): SPMWH1228FD5WAR0S3, SPMWH1228FD5WARMSC, and SPMWH1228FD5WAR0SC are direct electrical and mechanical equivalents. SPMWH1228FD5WAR0SC and SPMWH1228FD5WARMSC carry "Active" product status, making them preferred for new designs and long-term availability. SPMWH1228FD5WAR0S3 maintains "Not For New Designs" status despite identical performance.
For Enhanced Performance (LM281B+ Series): SPMWH1228FD5WARKSC and SPMWH1228FD5WARMSC offer "Active" status with identical electrical output. These are suitable for applications requiring current production sourcing.
For Optimized Efficiency (LM281BZ+ Series): SPMWH3228FD5WAR0SE, SPMWH3228FD5WARKSE, and SPMWH3228FD5WARMSE provide 0.1V lower forward voltage (3.0V vs. 3.1V) and 4 lm/W higher efficiency (144 vs. 140 lm/W). These are applicable in power-sensitive applications where reduced voltage drop and improved efficiency are beneficial. All three variants are "Active" status.
All substitute parts maintain identical package dimensions (2835 metric), thermal resistance (25°C/W), CRI (80), viewing angle (120°), and RoHS compliance. Selection should prioritize product status and inventory availability for supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can SPMWH1228FD5WAR0SC replace SPMWH1228FD5WARMS3 in existing designs? A: Yes. Both parts share identical electrical specifications: 3.1V forward voltage, 65 lm @ 150mA, 140 lm/W efficiency, 80 CRI, and 120° viewing angle. Package dimensions and thermal characteristics are identical. The primary difference is product status; SPMWH1228FD5WAR0SC is "Active" while SPMWH1228FD5WARMS3 is "Not For New Designs."
Q: What is the difference between LM281B and LM281B+ series? A: Both series deliver identical electrical performance at the specified test conditions: 3.1V, 65 lm, 140 lm/W. The LM281B+ designation indicates an enhanced generation with "Active" product status, whereas LM281B variants are "Not For New Designs." Electrical compatibility is complete.
Q: Can LM281BZ+ parts (SPMWH3228 base number) substitute for LM281B parts (SPMWH1228 base number)? A: Yes, with the following electrical differences: LM281BZ+ operates at 3.0V forward voltage (0.1V lower) and delivers 144 lm/W efficiency (4 lm/W higher). Flux output (65 lm @ 150mA), color temperature (5000K), CRI (80), and viewing angle (120°) are identical. Package dimensions and thermal resistance are unchanged. These differences are compatible in applications where lower voltage drop and higher efficiency are acceptable or beneficial.
Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry RoHS compliance certification. SPMWH1228FD5WAR0S3 is ROHS3 Compliant; all others are RoHS Compliant. Both certifications meet RoHS requirements.
Q: What is the significance of the packaging code suffix (S3, SC, SE)? A: The suffix indicates packaging variant and RoHS certification version. S3 denotes ROHS3 compliance; SC and SE denote standard RoHS compliance. Electrical and mechanical specifications remain identical across suffixes. Selection should be based on supply availability and compliance requirements.
Q: Are the 2835 package dimensions identical across all substitute parts? A: Yes. All parts use the 1113 (2835 metric) package with dimensions 3.50mm × 2.80mm and maximum seated height of 0.75mm. Surface mount compatibility and PCB footprint are identical.
Q: Which substitute part offers the best inventory availability? A: SPMWH1228FD5WAR0S3 has 1732 pcs in stock, the highest among all listed parts. SPMWH1228FD5WARMSC has 1039 pcs, and SPMWH3228FD5WARKSE has 1100 pcs. Inventory levels should be verified at time of procurement.
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