Equivalent & Substitute Parts for HSMH-C660

Part Overview

The HSMH-C660 is a red LED indication component manufactured by Broadcom Limited, designed for surface mount right-angle applications. This discrete 1.8V LED features a 639nm dominant wavelength with 16mcd brightness rating and clear lens optics in a compact 2-SMD, No Lead package. The product is classified as obsolete, making substitute part identification essential for ongoing production and maintenance applications requiring compatible red LED indicators with equivalent electrical and mechanical characteristics.

Substiute Parts

HSMH-C660

Broadcom LimitedIn Stock: 3165HSMH-C660 Datasheet

Current PartRFQ

LTST-S321KRKT

Lite-On Inc.In Stock: 12709LTST-S321KRKT Datasheet

MFR RecommendedRFQ

QTLP610C2TR

onsemiIn Stock: 2871QTLP610C2TR Datasheet

MFR RecommendedRFQ

QTLP610C7TR

onsemiIn Stock: 1205QTLP610C7TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HSMH-C660 are qualified based on the following electrical and mechanical compatibility criteria:

Primary Compatibility Parameters:

• Color: Red
• Mounting Type: Surface Mount, Right Angle
• Package / Case: 2-SMD, No Lead
• Lens Style: Rectangle with Domed Top
• Lens Size: 2.00mm x 1.00mm
• Size / Dimension: 3.00mm L x 2.00mm W
• Current - Test: 20mA

Allowable Variation Parameters:

• Voltage - Forward (Vf): 1.8V to 2.0V range
• Wavelength - Dominant: 630nm to 645nm range
• Millicandela Rating: 7mcd to 54mcd range
• Viewing Angle: 120° to 155° range
• Height (Max): 1.00mm to 1.10mm range

All substitute parts maintain identical mechanical footprint and mounting orientation, ensuring direct PCB compatibility without layout modifications.

Parameter Comparison

Engineering Selection Recommendations

LTST-S321KRKT (Lite-On Inc.) is the primary substitute option. This part maintains active product status with RoHS3 compliance, ensuring long-term availability and regulatory alignment. Forward voltage increases to 2V with brightness elevated to 54mcd, suitable for applications tolerating higher luminous intensity. Viewing angle reduces to 130°, representing a minor optical characteristic change within acceptable substitution parameters.

QTLP610C7TR (onsemi) provides the closest electrical match with 1.9V forward voltage and 20mcd brightness rating, closely mirroring the original HSMH-C660 performance envelope. However, product status is obsolete, limiting long-term procurement viability. This option is suitable for legacy system maintenance where existing inventory exists.

QTLP610C2TR (onsemi) is a secondary option with the lowest brightness rating at 7mcd and reduced viewing angle of 120°. Forward voltage increases to 2V. This substitute is appropriate only for applications where reduced luminous intensity is acceptable and viewing angle constraints do not impact system function.

All substitute parts share identical mechanical footprint, package configuration, and mounting orientation, enabling direct PCB-level replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can LTST-S321KRKT directly replace HSMH-C660 on existing PCBs?

A: Yes. Both parts maintain identical mechanical dimensions (3.00mm L x 2.00mm W), height profile (1.00mm), lens size (2.00mm x 1.00mm), and surface mount right-angle mounting configuration. No PCB layout changes are required. Circuit design must accommodate the increased forward voltage (2V vs. 1.8V) and higher brightness (54mcd vs. 16mcd).

Q: What is the primary difference between the three substitute options?

A: LTST-S321KRKT offers active product status and highest brightness (54mcd). QTLP610C7TR provides the closest electrical performance (1.9V, 20mcd) but with obsolete status. QTLP610C2TR has the lowest brightness (7mcd) and is suitable only for applications tolerating reduced luminous intensity.

Q: Are there compliance or regulatory differences between the main part and substitutes?

A: All parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99). LTST-S321KRKT carries RoHS3 compliance certification, providing enhanced regulatory alignment for new designs. Moisture sensitivity levels vary: HSMH-C660 is MSL 2A, LTST-S321KRKT is MSL 3, and onsemi parts are MSL 1.

Q: Does the viewing angle reduction from 155° to 130° or 120° impact substitution suitability?

A: Viewing angle reduction narrows the optical dispersion cone. Applications requiring wide-angle visibility across multiple viewing positions may experience reduced brightness perception at extreme angles. Evaluate specific application geometry to confirm acceptability.

Q: What forward voltage considerations apply when substituting HSMH-C660?

A: HSMH-C660 operates at 1.8V typical. LTST-S321KRKT and QTLP610C2TR require 2V, while QTLP610C7TR operates at 1.9V. Series resistor values in LED drive circuits must be recalculated to maintain 20mA test current at the substitute part's forward voltage. Verify power supply capability to deliver the required voltage without exceeding component ratings.

Q: Is LTST-S321KRKT recommended for new designs?

A: LTST-S321KRKT is the preferred substitute for new production due to active product status, ensuring long-term availability and supply chain stability. RoHS3 compliance supports modern regulatory requirements. Design validation must confirm that increased brightness (54mcd) and reduced viewing angle (130°) align with application requirements.