HSMD-S660 Equivalent & Substitute Parts

Part Overview

The HSMD-S660 is an orange 605nm LED indication component manufactured by Broadcom Limited, designed for discrete surface mount right-angle applications. This part operates at a typical forward voltage of 1.9V with a 20mA test current and provides 65mcd luminous intensity through a diffused rectangular domed lens. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

HSMD-S660

Broadcom LimitedIn Stock: 951HSMD-S660 Datasheet

Current PartRFQ

SML-A12DTT86

Rohm SemiconductorIn Stock: 16430SML-A12DTT86 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSMD-S660 is determined by the following critical parameters:

• Color and Wavelength: Orange spectrum (605-606nm dominant wavelength) for visual indication compatibility
• Mounting Configuration: Surface mount, right-angle orientation for PCB layout compatibility
• Package Type: 2-SMD, No Lead configuration for footprint compatibility
• Electrical Characteristics: Forward voltage (1.9-2.0V range) and test current (20mA) for circuit operation
• Optical Performance: Millicandela rating and lens transparency for visibility requirements
• Product Status and Compliance: REACH and ECCN classifications for regulatory continuity

The identified substitute SML-A12DTT86 from Rohm Semiconductor meets these core substitution criteria within acceptable parameter tolerances for orange LED indication applications.

Parameter Comparison

Engineering Selection Recommendations

The SML-A12DTT86 serves as a functional equivalent for the HSMD-S660 based on the following engineering criteria:

Electrical Compatibility: Both components operate within the 20mA test current specification. The forward voltage differential of 0.1V (1.9V to 2.0V) is within typical circuit design tolerance for LED indication circuits and does not preclude direct substitution in standard applications.

Optical Characteristics: The SML-A12DTT86 provides 100mcd versus the HSMD-S660's 65mcd, representing increased luminous intensity. The dominant wavelength variance of 1nm (605nm to 606nm) remains within the orange spectrum and maintains visual indication consistency. The lens transparency difference (diffused to clear) affects light distribution characteristics but does not prevent functional substitution.

Regulatory and Compliance Status: Both components maintain REACH Unaffected and EAR99 ECCN classifications, ensuring regulatory continuity. The SML-A12DTT86 carries ROHS3 Compliant status, providing enhanced environmental compliance.

Product Lifecycle: While the HSMD-S660 is obsolete, the SML-A12DTT86 is classified as Not For New Designs, indicating limited future availability. This status should be considered for long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can the SML-A12DTT86 directly replace the HSMD-S660 in existing designs?

A: Yes, within standard LED indication circuit applications. The electrical parameters (20mA test current, 1.9-2.0V forward voltage range) and package configuration (2-SMD, No Lead, surface mount right-angle) are compatible. Circuit validation is necessary if the design depends on specific optical characteristics such as the diffused lens property or exact 155° viewing angle.

Q: What is the impact of the 0.1V forward voltage difference?

A: The forward voltage increase from 1.9V to 2.0V represents a 5.3% change. In typical LED indication circuits with current-limiting resistors, this variance is accommodated by standard design practices and does not require circuit modification.

Q: How does the lens transparency change affect performance?

A: The HSMD-S660 features a diffused lens, while the SML-A12DTT86 has a clear lens. Diffused lenses scatter light over a wider area with reduced peak intensity, while clear lenses concentrate light in a more directional pattern. The SML-A12DTT86's higher millicandela rating (100mcd vs. 65mcd) partially compensates for this optical difference. Application-specific visibility requirements should be evaluated.

Q: Are there package footprint differences?

A: Both components use 2-SMD, No Lead packages with surface mount right-angle mounting. The HSMD-S660 measures 3.20mm L x 1.00mm W x 1.00mm H, while the SML-A12DTT86 measures 1.60mm L x 1.15mm W x 0.65mm H. The SML-A12DTT86 is physically smaller and may require PCB layout verification for mechanical clearance and solder joint accessibility.

Q: What is the significance of the "Not For New Designs" status of the SML-A12DTT86?

A: This classification indicates the manufacturer does not recommend this component for new product development and may discontinue production. While suitable for legacy system maintenance and production continuity, long-term availability cannot be assured. For new designs, consultation with the component supplier for current-generation orange LED alternatives is recommended.