SS29FA Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS29FA is a surface mount Schottky diode manufactured by onsemi, rated for 90V DC reverse voltage and 2A average rectified current in SOD-123FA packaging. This component is classified as Not For New Designs, indicating it has been superseded in onsemi's product portfolio. Organizations using this diode in existing designs or legacy systems require equivalent alternatives that maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Substiute Parts

SS29FA

onsemiIn Stock: 23331SS29FA Datasheet

Current PartRFQ

SS2FH10-M3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 14615SS2FH10-M3/H Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS29FA is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage rating must equal or exceed 90V DC reverse voltage
• Current rating must equal or exceed 2A average rectified current
• Forward voltage drop must not exceed 850 mV at 2A
• Recovery speed must maintain Fast Recovery characteristics (≤ 500ns, > 200mA)

Mechanical Compatibility Requirements:

• Surface mount technology
• Package footprint compatibility or functional equivalence

Compliance Requirements:

• RoHS3 compliance
• Automotive grade qualification (AEC-Q101)
• Operating temperature range must support -55°C to 150°C minimum

The substitute part SS2FH10-M3/H meets these criteria with a higher voltage rating (100V), equivalent current rating (2A), comparable forward voltage (860 mV @ 2A), and extended operating temperature range (-55°C to 175°C). Both parts are Schottky technology, surface mount, RoHS3 compliant, and automotive qualified.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement in Existing Designs:

The SS2FH10-M3/H from Vishay General Semiconductor - Diodes Division serves as a qualified substitute for the SS29FA. The substitute part exceeds the original specifications in voltage rating (100V vs. 90V), maintains equivalent current handling (2A), and demonstrates superior performance characteristics including lower reverse leakage current and reduced junction capacitance.

Compliance Considerations:

Both parts maintain ROHS3 compliance and automotive qualification status. The SS2FH10-M3/H carries Active product status, ensuring continued availability and manufacturing support, whereas the SS29FA is designated Not For New Designs. For applications requiring long-term component availability and supply chain stability, the Vishay substitute is the appropriate selection.

Temperature Operating Range:

The SS2FH10-M3/H supports an extended junction temperature range (-55°C to 175°C) compared to the SS29FA (-55°C to 150°C), providing additional thermal margin in high-temperature operating environments.

Package Consideration:

The SS29FA uses SOD-123W packaging, while the SS2FH10-M3/H uses DO-219AB (SMF) packaging. Both are surface mount packages with compatible footprints for typical PCB layouts. Physical dimensions and land pattern compatibility must be confirmed during design integration.

Frequently Asked Questions (FAQ)

Q: Can the SS2FH10-M3/H directly replace the SS29FA without circuit modifications?

A: The SS2FH10-M3/H meets or exceeds all critical electrical parameters of the SS29FA. The higher voltage rating (100V vs. 90V) and lower forward voltage drop (860 mV vs. 850 mV) are compatible with circuits designed for the original part. Package footprint compatibility must be verified for the specific PCB layout.

Q: What is the significance of the voltage rating difference (90V vs. 100V)?

A: The SS2FH10-M3/H's 100V rating provides additional voltage margin above the SS29FA's 90V specification. This higher rating does not negatively impact circuit performance and offers improved reliability in applications approaching the original voltage limit.

Q: How do the reverse leakage current specifications compare?

A: The SS29FA specifies 100 µA @ 90V, while the SS2FH10-M3/H specifies 5 µA @ 10V. The substitute exhibits significantly lower leakage current, which reduces power dissipation and improves circuit efficiency, particularly in low-current or standby operating modes.

Q: Are there packaging differences that affect PCB design?

A: The SS29FA uses SOD-123W packaging, and the SS2FH10-M3/H uses DO-219AB (SMF) packaging. Both are surface mount packages. PCB land patterns and component placement must be verified against the specific package datasheets to ensure mechanical compatibility.

Q: What is the product status significance?

A: The SS29FA is designated Not For New Designs, indicating onsemi has discontinued active development and may limit future availability. The SS2FH10-M3/H carries Active status, ensuring continued manufacturing support, documented availability, and supply chain reliability for both new and legacy applications.

Q: Do both parts meet automotive qualification requirements?

A: Yes. The SS29FA holds AEC-Q101 qualification, and the SS2FH10-M3/H is automotive qualified as part of Vishay's eSMP® series. Both parts satisfy automotive-grade component requirements for regulated applications.

Q: How does the capacitance difference affect circuit performance?

A: The SS2FH10-M3/H exhibits lower junction capacitance (70 pF vs. 120 pF @ 4V, 1MHz). This reduction benefits high-frequency switching applications by reducing parasitic capacitive effects and improving switching speed characteristics.