HEW1142LS-TR Equivalent & Substitute Parts

Part Overview

The HEW1142LS-TR is a white diffused LED indication component manufactured by Stanley Electric Co., designed for surface mount, right-angle applications. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The component features a 3.2V forward voltage, 1200mcd brightness rating, and 2-SMD no-lead package configuration suitable for compact electronic assemblies requiring white LED indication.

Substiute Parts

HEW1142LS-TR

Stanley Electric CoIn Stock: 3991HEW1142LS-TR Datasheet

Current PartRFQ

SMS1105UWDC

Bivar Inc.In Stock: 3898SMS1105UWDC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HEW1142LS-TR is determined by alignment of the following critical parameters:

Optical Characteristics: Color (white), lens transparency (diffused), and millicandela rating (1200mcd) establish the primary functional equivalence criteria.

Electrical Specifications: Forward voltage (Vf) tolerance, test current (20mA), and viewing angle compatibility define electrical interchangeability within circuit design constraints.

Physical Form Factor: Mounting type (surface mount, right angle), package configuration (2-SMD), and dimensional envelope (length, width, height) determine mechanical fit on printed circuit boards.

Regulatory Compliance: REACH status and ECCN classification ensure substitutes meet the same environmental and export control requirements.

The SMS1105UWDC from Bivar Inc. qualifies as a substitute based on matching optical output, electrical test parameters, mounting orientation, and regulatory compliance, with documented variations in forward voltage, viewing angle, and package lead configuration noted in the parameter comparison.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The HEW1142LS-TR is classified as obsolete. The SMS1105UWDC is an active product from Bivar Inc., ensuring ongoing availability and manufacturing support for new designs and production continuity.

Regulatory Compliance: Both components maintain REACH Unaffected status and EAR99 ECCN classification, confirming equivalent environmental and export control compliance.

Electrical Compatibility: The SMS1105UWDC operates at 3.4V forward voltage compared to the HEW1142LS-TR at 3.2V. This 0.2V differential must be evaluated within the circuit's voltage regulation and current-limiting design to confirm functional compatibility.

Optical Performance: Both components deliver 1200mcd brightness at 20mA test current with diffused white lens characteristics. The SMS1105UWDC provides a wider 120° viewing angle compared to the HEW1142LS-TR's 110°/105° specification, offering improved visibility in certain application geometries.

Physical Dimensions: The SMS1105UWDC is 0.30mm longer (2.80mm vs. 2.50mm) and 0.10mm shorter in height (0.80mm vs. 0.90mm). PCB layout verification is required to confirm fit within existing mechanical constraints.

Package Configuration: The SMS1105UWDC uses J-Lead termination versus the HEW1142LS-TR's no-lead configuration. Soldering process parameters and PCB pad design must be validated for the J-Lead variant.

Frequently Asked Questions (FAQ)

Q: Can the SMS1105UWDC directly replace the HEW1142LS-TR without circuit modification?

A: Direct replacement requires verification of three factors: (1) circuit voltage regulation accommodates the 3.4V forward voltage of the SMS1105UWDC versus the 3.2V specification of the HEW1142LS-TR; (2) PCB layout accommodates the 0.30mm length increase and 0.10mm height reduction; (3) soldering process is validated for J-Lead termination instead of no-lead configuration.

Q: What is the significance of the "Cool" color temperature designation on the SMS1105UWDC?

A: The SMS1105UWDC is specified as "White, Cool" with a dominant wavelength of 8000K. This indicates a cooler white color temperature compared to standard white LEDs. Visual appearance may differ from the original HEW1142LS-TR in end-user perception, though both are classified as white indication LEDs.

Q: Are there differences in moisture sensitivity between these components?

A: The HEW1142LS-TR has MSL 3 (168 hours), while the SMS1105UWDC has MSL 4 (72 hours). MSL 4 requires more stringent moisture control during storage and handling. Verify that manufacturing and assembly processes meet the more restrictive MSL 4 requirements.

Q: How do the viewing angles compare functionally?

A: The HEW1142LS-TR specifies 110° and 105° viewing angles, while the SMS1105UWDC specifies 120°. The SMS1105UWDC provides a 10° wider viewing angle, resulting in improved visibility from off-axis positions. This is generally advantageous for indication applications but must be confirmed against specific design requirements.

Q: What packaging format differences exist?

A: The HEW1142LS-TR uses 2-SMD no-lead configuration; the SMS1105UWDC uses 2-SMD J-Lead configuration. The SMS1105UWDC is supplied in Tape & Reel (TR) packaging. Verify that assembly equipment and soldering processes are compatible with J-Lead termination and that tape reel specifications match production line requirements.