SPMWH1228FD7WAQMS4 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD7WAQMS4 is a Samsung Semiconductor LM281B series cool white LED in 2835 metric package (1113 case). This surface mount LED operates at 3.1V forward voltage with 150mA test current, delivering 62 lumens at 25°C with a color temperature of 5700K and 90 CRI. The part is marked as Not For New Designs, indicating it has been superseded in Samsung's product portfolio. Identification of equivalent substitute parts is necessary for ongoing production support, inventory management, and design continuity in applications currently utilizing this component.

Substiute Parts

SPMWH1228FD7WAQMS4

Samsung Semiconductor, Inc.In Stock: 1204SPMWH1228FD7WAQMS4 Datasheet

Current PartRFQ

SPMWH1228FD7WAQMSE

Samsung Semiconductor, Inc.In Stock: 845SPMWH1228FD7WAQMSE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPMWH1228FD7WAQMS4 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Color specification: White, Cool
• Correlated Color Temperature (CCT): 5700K
• Package / Case: 1113 (2835 Metric)
• Mounting Type: Surface Mount
• Forward Voltage (Vf) Typical: 3.1V
• Test Current: 150mA
• Viewing Angle: 120°
• CRI: 90
• RoHS Compliance: Required
• MSL Rating: 2A (4 Weeks)

Allowable Parameter Variations:

• Flux output at 25°C: Within the specified tolerance range (60–64 lm for main part; 57–61 lm for substitute)
• Lumens/Watt efficiency: May vary due to manufacturing improvements in newer series
• Thermal Resistance: May differ between product generations
• Product Status: Substitute may be Active while main part is Not For New Designs
• Series designation: LM281B+ represents an improved generation of the LM281B platform

The substitute part SPMWH1228FD7WAQMSE meets all mandatory parameters and represents a direct functional equivalent with enhanced product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SPMWH1228FD7WAQMSE

The SPMWH1228FD7WAQMSE is the direct equivalent substitute for SPMWH1228FD7WAQMS4. Selection is based on the following engineering criteria:

1. Product Status Alignment: The substitute part carries Active product status, ensuring continued availability and manufacturing support from Samsung Semiconductor, Inc., whereas the main part is designated Not For New Designs.

2. Electrical Compatibility: Both parts share identical forward voltage (3.1V), test current (150mA), maximum current (160mA), and viewing angle (120°). The flux output difference (62 lm vs. 59 lm) falls within acceptable tolerance ranges for cool white 5700K LEDs in this package class.

3. Mechanical Compatibility: Package dimensions, mounting type, and physical footprint are identical (2835 metric, 3.50mm × 2.80mm, 0.75mm height). Direct PCB layout compatibility is confirmed.

4. Compliance Certification: Both parts maintain RoHS Compliance and identical MSL rating (2A, 4 Weeks), ensuring equivalent handling and storage requirements.

5. Thermal Consideration: The substitute exhibits higher thermal resistance (25°C/W vs. 17°C/W). In thermal-sensitive applications, verify that junction temperature remains within specified operating limits under maximum current conditions.

6. Color and Rendering: Identical CCT (5700K) and CRI (90) ensure color consistency in lighting applications.

The SPMWH1228FD7WAQMSE is suitable for direct replacement in existing designs and new production runs requiring cool white 5700K LEDs in 2835 package format.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD7WAQMSE be used as a direct drop-in replacement for SPMWH1228FD7WAQMS4?

A: Yes. Both parts share identical electrical specifications (3.1V, 150mA), mechanical dimensions (2835 package, 3.50mm × 2.80mm), and mounting characteristics. PCB layout and circuit design require no modification. The flux output difference (62 lm vs. 59 lm) is within normal tolerance for this LED category.

Q: What is the significance of the LM281B+ designation in the substitute part?

A: LM281B+ represents an improved generation within Samsung's LM281B platform. The "+" designation indicates product evolution with enhanced manufacturing processes while maintaining backward compatibility with LM281B electrical and mechanical specifications.

Q: Why does the substitute part have higher thermal resistance (25°C/W vs. 17°C/W)?

A: Thermal resistance variation between product generations reflects differences in die design and packaging materials. For applications operating at maximum current (160mA), calculate junction temperature using the formula: Tj = Ta + (P × Rθ), where Ta is ambient temperature and P is power dissipation. Verify that Tj remains within the device's maximum rated junction temperature.

Q: Are the packaging and moisture sensitivity requirements identical?

A: Yes. Both parts are supplied in Tape & Reel (TR) format with MSL rating 2A (4 Weeks). Storage and handling procedures are identical. Bake-out requirements before reflow soldering are the same.

Q: What is the lumens/watt difference between the two parts, and does it affect circuit design?

A: The main part delivers 133 lm/W while the substitute delivers 127 lm/W at 150mA test current. This 6 lm/W difference reflects manufacturing improvements in the newer LM281B+ series. Circuit design (current limiting resistors, driver circuits) remains unchanged. Light output will be approximately 5% lower with the substitute part under identical operating conditions.

Q: Are both parts RoHS compliant?

A: Yes. Both SPMWH1228FD7WAQMS4 and SPMWH1228FD7WAQMSE carry RoHS Compliance certification and are suitable for applications requiring restricted substance compliance.

Q: Can I mix inventory of both parts in the same production batch?

A: Yes. Both parts are electrically and mechanically compatible. However, due to the 3 lm flux difference, visual uniformity in applications requiring consistent brightness may be affected. For color-critical or brightness-critical applications, maintain separate inventory and assembly tracking.

Q: What is the viewing angle specification, and does it differ between parts?

A: Both parts specify 120° viewing angle. This is the half-angle at which luminous intensity drops to 50% of the peak value. Optical performance and beam pattern are identical between the two parts.