SS29 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS29 is a Schottky rectifier diode manufactured by onsemi, rated for 90 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design updates, or component optimization while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 90 V
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS29 is determined by the following critical parameters:

Voltage Rating: The reverse voltage rating must equal or exceed 90 V. Substitute parts rated at 100 V are acceptable as they provide margin above the minimum requirement.

Current Rating: The average rectified current must equal or exceed 2 A. Substitute parts rated at 1 A do not meet this requirement and are not suitable for direct replacement in applications requiring full 2 A capacity.

Package Compatibility: All substitute parts must use the DO-214AA (SMB) surface mount package to ensure mechanical and thermal compatibility with existing PCB layouts.

Technology: All candidates are Schottky diodes with fast recovery characteristics (≤ 500ns, > 200mA), maintaining the same switching performance class.

Forward Voltage: Forward voltage specifications vary slightly among substitutes (790 mV to 850 mV @ 2 A). These variations are within acceptable operating margins for most rectification applications.

Temperature Range: The SS29 operates from -65°C to 125°C. Substitute parts with extended temperature ranges (-65°C to 150°C or higher) provide additional operational margin.

Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Product Status	Package
SS29	onsemi	90 V	2 A	850 mV @ 2 A	400 µA @ 90 V	-65°C ~ 125°C	Not For New Designs	DO-214AA (SMB)
MBRS2H100T3G	onsemi	100 V	2 A	790 mV @ 2 A	8 µA @ 100 V	-65°C ~ 175°C	Active	DO-214AA (SMB)
B290-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	-65°C ~ 150°C	Active	DO-214AA (SMB)
B290Q-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	-65°C ~ 150°C	Active	DO-214AA (SMB)
SS2H9-E3/52T	Vishay General Semiconductor - Diodes Division	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	-65°C ~ 175°C	Active	DO-214AA (SMB)
SS2H9-E3/5BT	Vishay General Semiconductor - Diodes Division	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	-65°C ~ 175°C	Active	DO-214AA (SMB)

Engineering Selection Recommendations

Primary Substitute - MBRS2H100T3G (onsemi): This part provides the closest electrical match with 2 A current capacity and exceeds the voltage requirement at 100 V. It is manufactured by the same supplier as the original SS29, ensuring consistency in design philosophy and manufacturing standards. The part is in Active product status with extended temperature range (-65°C to 175°C) and demonstrates improved reverse leakage characteristics (8 µA vs. 400 µA). ROHS3 compliance and unlimited moisture sensitivity level match the original specification.

Secondary Substitute - B290-13-F (Diodes Incorporated): This part matches the exact voltage and current ratings (90 V, 2 A) and is in Active product status. It provides a direct electrical equivalent with lower reverse leakage (7 µA) and is available in high inventory quantities (31,525 pcs). Operating temperature range extends to 150°C, providing additional thermal margin.

Automotive-Grade Alternative - B290Q-13-F (Diodes Incorporated): This variant of B290-13-F includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components. Electrical specifications are identical to B290-13-F with the addition of automotive qualification documentation.

Vishay Alternatives - SS2H9-E3/52T and SS2H9-E3/5BT: Both Vishay parts provide exact voltage and current matching (90 V, 2 A) with extended temperature range to 175°C. These parts are in Active product status and represent cross-manufacturer equivalents with compatible electrical characteristics.

Not Recommended for Direct Substitution: Parts rated at 1 A current capacity (MBRS1100T3G, MBRS190T3G, B190B-13-F, B190BQ-13-F, STPS1H100U) do not meet the 2 A requirement and are unsuitable for applications requiring the full current rating of the SS29.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 A rated diode as a substitute for the SS29?

A: No. The SS29 is rated for 2 A average rectified current. Substitutes must maintain this current rating or higher. Using a 1 A diode in a 2 A application will result in thermal stress, reduced component life, and potential circuit failure.

Q: What is the difference between B290-13-F and B290Q-13-F?

A: Both parts have identical electrical specifications (90 V, 2 A). The B290Q-13-F includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring certified components. The B290-13-F is the standard industrial version.

Q: Why does MBRS2H100T3G have a higher voltage rating (100 V) than the SS29 (90 V)?

A: The 100 V rating provides additional voltage margin above the 90 V requirement. This is acceptable in substitution because the part can safely operate at the lower voltage with improved reliability. The higher rating does not negatively impact circuit performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original SS29.

Q: What is the significance of the forward voltage difference between SS29 (850 mV) and substitute parts (790 mV)?

A: The forward voltage variation of 60 mV is within normal manufacturing tolerance for Schottky diodes and does not significantly impact rectification performance in most applications. The lower forward voltage of substitute parts (790 mV) represents an improvement in efficiency with reduced power dissipation.

Q: Can I use SS2H9-E3/52T and SS2H9-E3/5BT interchangeably?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (90 V, 2 A, 790 mV forward voltage). The difference is in packaging format: SS2H9-E3/52T uses standard tape and reel, while SS2H9-E3/5BT uses Vishay's 5BT packaging variant. Both are compatible with standard SMB pick-and-place equipment.

Q: Is the SS29 still available for new designs?

A: No. The SS29 is classified as "Not For New Designs." For new circuit designs, select from the Active status alternatives listed in this document, such as MBRS2H100T3G, B290-13-F, or SS2H9-E3/5BT.

Q: What is the reverse leakage current and why does it vary among substitutes?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. The SS29 specifies 400 µA @ 90 V, while most substitutes specify 7-10 µA @ 90 V or 100 V. Lower leakage current indicates improved diode quality and reduced power dissipation in reverse bias conditions. Variations are due to different manufacturing processes and die designs among manufacturers.

Q: Do all substitute parts use the same DO-214AA package?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes. No PCB redesign is required when substituting these parts.

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