US1BFA Equivalent & Substitute Parts

Part Overview

The US1BFA is a general-purpose rectifier diode manufactured by onsemi, rated for 100V DC reverse voltage and 1A average rectified current in a surface mount SOD-123FA package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Organizations currently using US1BFA in production or maintenance applications require qualified substitute components that maintain electrical and mechanical compatibility while offering active product status and continued supplier support.

Substiute Parts

US1BFA

onsemiIn Stock: 20145US1BFA Datasheet

Current PartRFQ

ES07B-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 110339ES07B-GS08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the US1BFA is determined by strict equivalence across the following critical parameters:

Voltage Rating: The substitute must maintain a DC reverse voltage rating of 100V or greater to ensure safe operation in the original circuit application.

Current Rating: The substitute must support the average rectified current requirement. The ES07B-GS08 is rated for 500mA, which is lower than the US1BFA's 1A rating. This part is therefore suitable only for applications where the actual circuit current demand does not exceed 500mA.

Speed Classification: Both the main part and substitute must operate as fast recovery diodes with reverse recovery time ≤ 500ns at currents > 200mA.

Mounting Technology: Both components are surface mount devices, ensuring mechanical compatibility with existing PCB layouts.

Temperature Range: The operating junction temperature range of -55°C to 150°C must be maintained.

Compliance Standards: RoHS3 compliance is required for environmental and regulatory compatibility.

The ES07B-GS08 meets these substitution criteria with the exception of current rating, which represents a derating of the circuit. This substitution is valid only when circuit analysis confirms that the maximum operating current does not exceed 500mA.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status: The ES07B-GS08 carries an Active product status designation, ensuring continued availability and supplier support. The US1BFA's "Not For New Designs" status indicates onsemi has discontinued active development and may limit long-term supply availability.

For Compliance and Certification: The ES07B-GS08 includes AEC-Q101 automotive qualification, providing additional quality assurance beyond the RoHS3 compliance shared by both parts. Both components maintain ROHS3 compliance and REACH unaffected status.

For Current Derating Consideration: The ES07B-GS08 is rated for 500mA average rectified current, representing a 50% reduction from the US1BFA's 1A rating. This substitution is valid only when circuit analysis confirms that the maximum operating current does not exceed 500mA under all operating conditions, including transient events and temperature extremes.

For Package Compatibility: The US1BFA uses SOD-123W packaging while the ES07B-GS08 uses DO-219AB (SMF) packaging. These packages have different physical dimensions and PCB footprints. PCB layout modification is required for this substitution.

For Performance Characteristics: The ES07B-GS08 demonstrates improved reverse recovery time (25ns versus 50ns), which may provide benefits in high-frequency switching applications. Forward voltage characteristics are similar between the two parts.

Frequently Asked Questions (FAQ)

Q: Can the ES07B-GS08 directly replace the US1BFA without PCB modification?

A: No. The US1BFA uses SOD-123W packaging while the ES07B-GS08 uses DO-219AB (SMF) packaging. These packages have different physical dimensions and land patterns. PCB layout modification is required.

Q: What is the primary limitation of using ES07B-GS08 as a substitute?

A: The ES07B-GS08 is rated for 500mA average rectified current, compared to the US1BFA's 1A rating. This substitution is valid only when the actual circuit current demand does not exceed 500mA under all operating conditions.

Q: Are both parts compliant with environmental regulations?

A: Yes. Both the US1BFA and ES07B-GS08 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the ES07B-GS08's AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard. This certification indicates the ES07B-GS08 has undergone additional reliability and quality testing, providing enhanced assurance for applications requiring automotive-grade components.

Q: How do the reverse recovery times compare?

A: The ES07B-GS08 has a reverse recovery time of 25ns, compared to the US1BFA's 50ns. The faster recovery time of the ES07B-GS08 may provide performance benefits in high-frequency switching applications.

Q: Are the forward voltage characteristics compatible?

A: The forward voltage characteristics are similar. The US1BFA specifies 950mV maximum at 1A, while the ES07B-GS08 specifies 980mV maximum at 1A. This 30mV difference is within typical circuit tolerance margins.

Q: What is the operating temperature range for both parts?

A: Both the US1BFA and ES07B-GS08 operate across a junction temperature range of -55°C to 150°C, ensuring compatibility across industrial and extended temperature applications.

Q: Why is the US1BFA marked "Not For New Designs"?

A: This designation indicates that onsemi has superseded this component in their product portfolio. While existing inventory may be available, the manufacturer recommends using alternative parts for new circuit designs to ensure long-term supply continuity and access to design support.