SPMWH1228FD5WATUS4 LED Equivalent & Substitute Parts

Part Overview

The SPMWH1228FD5WATUS4 is a Samsung Semiconductor LM281B series surface-mount LED in 2835 metric package (1113 case). This component delivers neutral white light at 4000K color temperature with 67 lumens at 25°C and 150mA test current. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and component sourcing continuity.

Substiute Parts

SPMWH1228FD5WATUS4

Samsung Semiconductor, Inc.In Stock: 38998SPMWH1228FD5WATUS4 Datasheet

Current PartRFQ

SPMWH1228FD5WAT0S4

Samsung Semiconductor, Inc.In Stock: 39970SPMWH1228FD5WAT0S4 Datasheet

Parametric EquivalentRFQ

SPMWH1228FD5WATMS4

Samsung Semiconductor, Inc.In Stock: 8564SPMWH1228FD5WATMS4 Datasheet

Parametric EquivalentRFQ

SPMWH3228FD5WAT0SG

Samsung Semiconductor, Inc.In Stock: 848SPMWH3228FD5WAT0SG Datasheet

Parametric EquivalentRFQ

SPMWH3228FD5WATKSG

Samsung Semiconductor, Inc.In Stock: 1010SPMWH3228FD5WATKSG Datasheet

Parametric EquivalentRFQ

SPMWH3228FD5WATMSG

Samsung Semiconductor, Inc.In Stock: 746SPMWH3228FD5WATMSG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPMWH1228FD5WATUS4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Color: White, Neutral
• CCT: 4000K
• Flux @ 25°C, 150mA: 67 lm (65–69 lm range)
• Forward Voltage (Vf) Typical: 3.1V or 3.0V
• Test Current: 150mA
• Maximum Current: 160mA
• CRI: 80
• Viewing Angle: 120°
• Package / Case: 1113 (2835 Metric)
• Mounting Type: Surface Mount
• Size / Dimension: 0.138" L × 0.110" W (3.50mm × 2.80mm)
• Height - Seated (Max): 0.030" (0.75mm)
• Thermal Resistance: 25°C/W
• RoHS Status: RoHS Compliant
• MSL: 2A (4 Weeks)

Substitute Parts Identified:

Group 1: LM281B Series (Identical Electrical & Mechanical Parameters)

• SPMWH1228FD5WAT0S4
• SPMWH1228FD5WATMS4

These parts maintain all electrical and mechanical specifications identical to the main part, differing only in packaging or tape configuration codes.

Group 2: LM281BZ+ Series (Active Status Alternative)

• SPMWH3228FD5WAT0SG
• SPMWH3228FD5WATKSG
• SPMWH3228FD5WATMSG

These parts represent the active production successor to the LM281B series. They maintain identical optical output (67 lm at 150mA), CRI (80), viewing angle (120°), and package dimensions. Forward voltage is 3.0V (versus 3.1V for LM281B), resulting in slightly higher efficiency (149 lm/W versus 144 lm/W). All parts are RoHS compliant with identical MSL ratings.

Parameter Comparison

Engineering Selection Recommendations

For Existing Production Support (LM281B Series):

SPMWH1228FD5WAT0S4 and SPMWH1228FD5WATMS4 are direct parametric equivalents to SPMWH1228FD5WATUS4. All three parts are classified as "Not For New Designs" and share identical electrical and mechanical specifications. Selection between these three LM281B variants should be based on packaging availability and supply chain logistics. All three maintain RoHS compliance and identical MSL ratings.

For New Designs and Long-Term Availability (LM281BZ+ Series):

SPMWH3228FD5WAT0SG, SPMWH3228FD5WATKSG, and SPMWH3228FD5WATMSG represent the active production alternative. These LM281BZ+ parts deliver identical optical performance (67 lm at 150mA, 4000K, 80 CRI, 120° viewing angle) and maintain full mechanical compatibility with the 2835 package footprint. The forward voltage reduction from 3.1V to 3.0V results in improved efficiency (149 lm/W versus 144 lm/W) with no impact on circuit compatibility for constant-current driver applications. All LM281BZ+ variants are RoHS compliant with identical MSL ratings and are recommended for new product development to ensure long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can SPMWH1228FD5WAT0S4 and SPMWH1228FD5WATMS4 be used interchangeably with SPMWH1228FD5WATUS4?

A: Yes. All three LM281B parts share identical electrical specifications (3.1V forward voltage, 150mA test current, 67 lm output at 25°C), optical characteristics (4000K, 80 CRI, 120° viewing angle), and mechanical dimensions (2835 package, 0.138" × 0.110" × 0.030" max height). Differences exist only in packaging configuration codes. All three are RoHS compliant with 2A MSL ratings.

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

A: The LM281BZ+ series is the active production successor to the LM281B series. Both deliver identical optical output (67 lm at 150mA, 4000K, 80 CRI) and use the same 2835 package footprint. The primary difference is forward voltage: LM281B operates at 3.1V typical, while LM281BZ+ operates at 3.0V typical. This 0.1V reduction improves efficiency from 144 lm/W to 149 lm/W. For constant-current driver circuits, this voltage difference has no impact on circuit operation or component compatibility.

Q: Are the LM281BZ+ parts (SPMWH3228 series) mechanically compatible with the LM281B parts (SPMWH1228 series)?

A: Yes. Both series use the 1113 (2835 metric) package with identical dimensions: 0.138" L × 0.110" W (3.50mm × 2.80mm) and maximum seated height of 0.030" (0.75mm). PCB footprints and reflow profiles are identical. Thermal resistance is 25°C/W for both series.

Q: Why is SPMWH1228FD5WATUS4 marked "Not For New Designs"?

A: This designation indicates the LM281B series has reached end-of-life status. Samsung Semiconductor recommends using the active LM281BZ+ series (SPMWH3228 variants) for new product development. The LM281B parts remain available for existing production support and maintenance applications.

Q: What is the MSL rating and what does it mean for storage?

A: All listed parts carry MSL 2A (4 Weeks). This indicates the component can be stored in a dry environment (≤10% relative humidity) for up to 4 weeks before reflow soldering. After 4 weeks, the component must be baked at 125°C for 24 hours before use to remove absorbed moisture.

Q: Can I substitute an LM281BZ+ part into an existing circuit designed for LM281B?

A: Yes, for constant-current driver applications. The 0.1V forward voltage difference (3.1V to 3.0V) does not affect circuit operation when using constant-current LED drivers. The identical optical output, CRI, viewing angle, and package footprint ensure drop-in compatibility. For constant-voltage applications, verify that the lower forward voltage does not cause excessive current through series resistors.

Q: What inventory levels are available for each part?

A: SPMWH1228FD5WATUS4: 38,946 pcs; SPMWH1228FD5WAT0S4: 39,914 pcs; SPMWH1228FD5WATMS4: 8,482 pcs; SPMWH3228FD5WAT0SG: 774 pcs; SPMWH3228FD5WATKSG: 902 pcs; SPMWH3228FD5WATMSG: 677 pcs. Inventory levels are subject to change. Verify current availability with your supplier.