HSMS-281F-TR2G Equivalent & Substitute Parts

Part Overview

The HSMS-281F-TR2G is an RF Schottky diode manufactured by Broadcom Limited, configured as a 1 Pair Common Cathode device in SOT-323 packaging. This component is designed for RF applications requiring low capacitance and fast switching characteristics. The part is currently classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The 20V peak reverse voltage rating and 1A maximum current capability define its operational envelope for RF signal detection and mixing applications.

Substiute Parts

HSMS-281F-TR2G

Broadcom LimitedIn Stock: 1029HSMS-281F-TR2G Datasheet

Current PartRFQ

1PS70SB85,115

Nexperia USA Inc.In Stock: 43331PS70SB85,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSMS-281F-TR2G is determined by the following critical parameters:

• Diode Configuration: Must be 1 Pair Common Cathode Schottky technology
• Package Compatibility: SC-70 / SOT-323 surface mount package required for mechanical and electrical interface compatibility
• Voltage Rating: Reverse voltage capability must meet or exceed application requirements
• Current Handling: Forward current rating must support circuit operating conditions
• Capacitance Characteristics: Low junction capacitance essential for RF performance
• Temperature Range: Operating temperature rating must accommodate thermal environment

The 1PS70SB85,115 from Nexperia USA Inc. qualifies as a substitute based on matching diode configuration, package type, and core electrical characteristics within acceptable operating parameters.

Parameter Comparison

Engineering Selection Recommendations

The 1PS70SB85,115 is available as an active product from Nexperia USA Inc., providing supply continuity for the obsolete HSMS-281F-TR2G. This substitute maintains identical diode configuration and package form factor, ensuring mechanical and electrical interface compatibility.

Key considerations for selection:

• Voltage Derating: The substitute is rated at 15V maximum reverse voltage compared to 20V for the original part. Applications operating near the 20V limit require circuit analysis to confirm adequate margin with the lower rating.
• Current Capacity: The substitute is rated at 30mA per diode versus 1A for the original. High-current RF applications must be evaluated against this reduced rating.
• Temperature Margin: The substitute maximum junction temperature is 125°C versus 150°C for the original. Thermal design must accommodate this reduced operating range.
• Compliance Status: The substitute carries AEC-Q100 automotive qualification and ROHS3 compliance, providing additional quality and environmental assurance.

Selection of the 1PS70SB85,115 is appropriate for applications where the reduced voltage, current, and temperature ratings do not conflict with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1PS70SB85,115 directly replace the HSMS-281F-TR2G in all applications?

A: Direct replacement is possible only when circuit operating conditions remain within the substitute's electrical ratings. The 15V reverse voltage maximum, 30mA per-diode current limit, and 125°C junction temperature maximum must be verified against your specific application requirements.

Q: What is the significance of the SOT-323 package compatibility?

A: Both parts use the SC-70 / SOT-323 surface mount package, ensuring identical PCB footprint, land pattern, and reflow soldering compatibility. No layout or assembly modifications are required.

Q: Why does the substitute have lower current and voltage ratings?

A: The 1PS70SB85,115 is optimized for small-signal RF applications with lower power dissipation requirements. The HSMS-281F-TR2G was designed for higher-power RF circuits. Application-specific circuit analysis determines whether the substitute's ratings are sufficient.

Q: Is the AEC-Q100 qualification on the substitute relevant to my application?

A: AEC-Q100 qualification indicates the part meets automotive-grade reliability and testing standards. This qualification is beneficial for applications requiring high reliability but is not mandatory for non-automotive use.

Q: What does ROHS3 compliance mean for the substitute?

A: ROHS3 compliance indicates the substitute meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This is relevant for applications subject to environmental regulations or customer requirements.

Q: Are there any thermal design considerations when substituting?

A: The substitute's 125°C maximum junction temperature is 25°C lower than the original part. Thermal design must ensure junction temperature remains below this limit under worst-case operating conditions, including ambient temperature and power dissipation.