SMLK18WBJBW1 Equivalent & Substitute Parts

Part Overview

The SMLK18WBJBW1 is a surface mount LED from Rohm Semiconductor's SML series, specified for warm white lighting at 3000K color temperature. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part delivers 16 lm at 90mA test current with a forward voltage of 3.9V in a compact 1808 (4.00mm x 2.00mm) package.

Substiute Parts

SMLK18WBJBW1

Rohm SemiconductorIn Stock: 989SMLK18WBJBW1 Datasheet

Current PartRFQ

LTW-K140SZR30

Lite-On Inc.In Stock: 60791LTW-K140SZR30 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMLK18WBJBW1 is based on the following critical parameters:

• Color temperature matching at 3000K warm white
• Surface mount technology with 2-SMD flat lead configuration
• Forward voltage compatibility within typical LED operating ranges
• Luminous flux output suitable for equivalent lighting applications
• RoHS3 compliance and REACH status alignment
• Moisture sensitivity level and storage requirements

The LTW-K140SZR30 from Lite-On Inc. qualifies as a substitute based on matching color temperature (3000K), surface mount configuration (2-SMD flat lead), RoHS3 compliance, and active product status. While dimensional and electrical parameters differ, these variations remain within acceptable substitution tolerances for warm white LED applications.

Parameter Comparison

Engineering Selection Recommendations

The LTW-K140SZR30 is suitable as a substitute for the obsolete SMLK18WBJBW1 based on the following factors:

• Both components maintain ROHS3 compliance, satisfying regulatory requirements for new designs and production.
• The LTW-K140SZR30 carries active product status, ensuring long-term availability and supply chain stability compared to the obsolete SMLK18WBJBW1.
• Color temperature matching at 3000K warm white ensures consistent lighting characteristics in applications requiring this specific chromaticity.
• Both components employ identical mounting technology (surface mount, 2-SMD flat lead configuration), allowing direct PCB layout compatibility.
• The substitute part demonstrates superior luminous efficacy (109 lm/W versus 46 lm/W), resulting in improved energy efficiency at equivalent light output.

Design considerations include dimensional differences: the LTW-K140SZR30 is physically smaller (2.70mm x 1.40mm versus 4.00mm x 2.00mm) and operates at lower forward voltage (3.2V versus 3.9V) and test current (60mA versus 90mA). Circuit designs must accommodate these electrical parameter variations through appropriate current-limiting resistor adjustments.

Frequently Asked Questions (FAQ)

Q: Can the LTW-K140SZR30 directly replace the SMLK18WBJBW1 without circuit modifications?

A: Direct PCB footprint replacement is not possible due to dimensional differences. The LTW-K140SZR30 (2.70mm x 1.40mm) is smaller than the SMLK18WBJBW1 (4.00mm x 2.00mm). Forward voltage differences (3.2V versus 3.9V) require recalculation of current-limiting resistor values to maintain proper LED operation.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference?

A: The SMLK18WBJBW1 carries MSL 4 (72-hour floor life), while the LTW-K140SZR30 carries MSL 3 (168-hour floor life). MSL 3 provides extended handling time before reflow soldering, reducing risk of moisture-induced failures during assembly. Both components require appropriate moisture control during storage and handling per IPC standards.

Q: Are there viewing angle considerations for this substitution?

A: The SMLK18WBJBW1 does not specify a viewing angle parameter. The LTW-K140SZR30 specifies 120° viewing angle. Applications requiring specific light distribution patterns should evaluate whether the 120° specification meets optical design requirements.

Q: How do the luminous flux specifications compare?

A: The SMLK18WBJBW1 produces 16 lm at 90mA test current. The LTW-K140SZR30 produces 21 lm at 60mA test current. The substitute delivers higher absolute flux at lower current, indicating superior efficiency. Circuit design must account for the lower test current specification when establishing operating parameters.

Q: What packaging format differences exist?

A: The SMLK18WBJBW1 is supplied in Cut Tape (CT) and Digi-Reel format. The LTW-K140SZR30 is supplied in Tape & Reel (TR) format. Both are standard surface mount packaging formats compatible with automated assembly equipment.