S320 Schottky Diode 200V 3A DO-214AA Equivalent & Substitute Parts

Part Overview

The onsemi S320 is a Schottky rectifier diode rated for 200V DC reverse voltage and 3A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, legacy system support, and procurement of functionally compatible alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

S320

onsemiIn Stock: 1806S320 Datasheet

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MBRS3200T3G

onsemiIn Stock: 55147MBRS3200T3G Datasheet

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SK3200B-LTP

Micro Commercial CoIn Stock: 4123SK3200B-LTP Datasheet

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STPS2200U

STMicroelectronicsIn Stock: 5190STPS2200U Datasheet

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VSSB420S-M3/52T

Vishay General Semiconductor - Diodes DivisionIn Stock: 1301VSSB420S-M3/52T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S320 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 200V
• Mounting Type: Surface Mount
• Package / Case: DO-214AA, SMB
• Technology: Schottky
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitute must equal or exceed 3A
• Voltage - Forward (Vf) (Max) @ If: Substitute must not exceed the original specification
• Current - Reverse Leakage @ Vr: Substitute must not exceed the original specification
• Operating Temperature - Junction: Substitute must support the required operating range or exceed it
• Reverse Recovery Time (trr): Substitute must meet fast recovery classification

Substitute parts are grouped based on their ability to meet or exceed the electrical performance of the S320 while maintaining package and mounting compatibility. Parts with lower current ratings or higher forward voltage drops are identified as partial substitutes suitable only for applications with reduced current requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MBRS3200T3G (onsemi)

The MBRS3200T3G is the direct electrical and mechanical equivalent of the S320. Both parts share identical voltage and current ratings (200V, 3A), matching package specifications (DO-214AA, SMB), and fast recovery Schottky technology. The MBRS3200T3G offers superior forward voltage performance (840 mV vs. 900 mV @ 3A) and an extended operating temperature range (-65°C to 175°C vs. -65°C to 150°C). The MBRS3200T3G maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. This part is the recommended direct replacement for the end-of-life S320.

Secondary Substitute: SK3200B-LTP (Micro Commercial Co)

The SK3200B-LTP meets all mandatory electrical specifications with 200V reverse voltage and 3A current rating in DO-214AA package. Forward voltage performance is comparable (860 mV @ 3A). This part is Active and ROHS3 compliant. The operating temperature range (-55°C to 150°C) is narrower than the S320 at the lower end. Selection of this part is appropriate when onsemi MBRS3200T3G availability is constrained.

Partial Substitute: STPS2200U (STMicroelectronics)

The STPS2200U is a 200V Schottky diode in DO-214AA package with reduced current rating (2A vs. 3A). This part is suitable only for applications where the circuit current requirement does not exceed 2A. The STPS2200U offers superior forward voltage (800 mV @ 2A) and lower reverse leakage (5 µA @ 200V). Extended operating temperature range (-40°C to 175°C) and Active product status support long-term availability. Use this part only when circuit design permits current derating.

Partial Substitute: VSSB420S-M3/52T (Vishay General Semiconductor - Diodes Division)

The VSSB420S-M3/52T is a 200V Schottky diode in DO-214AA package with reduced current rating (1.8A vs. 3A). This part is suitable only for applications where the circuit current requirement does not exceed 1.8A. The VSSB420S-M3/52T is part of the TMBS® series and is Active with ROHS3 compliance. Use this part only when circuit design permits significant current derating.

Frequently Asked Questions (FAQ)

Q: Can the MBRS3200T3G directly replace the S320 without circuit modification?

A: Yes. The MBRS3200T3G is a direct replacement. Both parts have identical voltage (200V) and current (3A) ratings, matching DO-214AA package specifications, and Schottky technology. The MBRS3200T3G offers improved forward voltage performance and extended temperature range, making it functionally superior with no circuit changes required.

Q: What is the difference between the S320 and MBRS3200T3G in terms of forward voltage?

A: The S320 has a maximum forward voltage of 900 mV at 3A, while the MBRS3200T3G is rated at 840 mV at 3A. The MBRS3200T3G exhibits lower forward voltage drop, resulting in reduced power dissipation and improved efficiency in the application circuit.

Q: Can I use the STPS2200U as a substitute for the S320?

A: The STPS2200U can be used only if the application circuit operates at 2A or below. The STPS2200U is rated for 2A average rectified current, compared to the S320's 3A rating. Using this part in a circuit designed for 3A operation will exceed the component's current rating and may cause failure.

Q: Are all substitute parts available in the same DO-214AA package?

A: Yes. All substitute parts listed (MBRS3200T3G, SK3200B-LTP, STPS2200U, and VSSB420S-M3/52T) are available in DO-214AA (SMB) surface mount package, ensuring mechanical and PCB layout compatibility with the S320.

Q: What is the significance of the "Not For New Designs" status of the S320?

A: The "Not For New Designs" status indicates that the S320 has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available, but long-term supply is not guaranteed. For new designs and legacy system support, selection of an Active substitute part such as MBRS3200T3G is required.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All substitute parts listed (MBRS3200T3G, SK3200B-LTP, STPS2200U, and VSSB420S-M3/52T) are ROHS3 compliant and have unlimited moisture sensitivity rating (MSL 1), matching the environmental compliance profile of the S320.

Q: What is the reverse recovery time specification, and how does it affect substitution?

A: Reverse recovery time (trr) is the time required for a diode to switch from forward conduction to reverse blocking. The S320 specifies 30 ns trr. All substitute parts maintain fast recovery classification (≤ 500ns for currents > 200mA), ensuring compatibility with high-frequency switching applications. The S320's 30 ns specification is a subset of the fast recovery category.

Q: Can I use the SK3200B-LTP if the MBRS3200T3G is unavailable?

A: Yes. The SK3200B-LTP is a suitable alternative when MBRS3200T3G availability is limited. Both parts have identical 200V/3A ratings and DO-214AA packaging. The SK3200B-LTP operating temperature range is narrower at the lower end (-55°C vs. -65°C), which may be acceptable depending on application requirements.