Equivalent & Substitute Parts for Vishay S2G General Purpose Rectifier Diode

Part Overview

The Vishay S2G is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 1.5 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status and is utilized in standard rectification applications requiring moderate current handling at 400 V operation.

Substitute parts are necessary when the original Vishay S2G becomes unavailable, when alternative manufacturers are preferred for supply chain optimization, or when design requirements permit operation with equivalent electrical characteristics within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	V
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	1	µA @ 400 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the Vishay S2G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max): Operating characteristic affecting circuit performance
Speed Classification: Recovery time characteristics
Operating Temperature Range: Junction temperature limits
Reverse Leakage Current: Leakage characteristics at rated voltage

Parts are grouped into three categories based on substitution scope:

Direct Equivalents (Same Electrical Rating): Parts with 400 V reverse voltage and 1.5 A current rating in SMB package.

Uprated Substitutes (Higher Current Rating): Parts with 400 V reverse voltage and current ratings exceeding 1.5 A, suitable for applications where higher current capacity is acceptable.

Downrated Substitutes (Lower Current Rating): Parts with 400 V reverse voltage and current ratings below 1.5 A, suitable only for applications where the actual circuit current requirement is lower than the original specification.

Parameter Comparison

Manufacturer	Part Number	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
Vishay General Semiconductor	S2G	400	1.5	1.15 @ 1.5 A	Standard >500ns	1 @ 400 V	DO-214AA (SMB)	-55 to 150	Active
onsemi	MRS1504T3G	400	1.5	1.04 @ 1.5 A	Standard >500ns	1 @ 400 V	DO-214AA (SMB)	-55 to 150	Not For New Designs
Diotec Semiconductor	S2G	400	2	1.15 @ 2 A	Standard >500ns	5 @ 1700 V	DO-214AA (SMB)	-50 to 150	Active
Diodes Incorporated	S2G-13-F	400	1.5	1.15 @ 1.5 A	Standard >500ns	5 @ 400 V	DO-214AA (SMB)	-65 to 150	Active
STMicroelectronics	STTH1R04U	400	1	1.5 @ 1 A	Fast ≤500ns	5 @ 400 V	DO-214AA (SMB)	-55 to 175	Active
STMicroelectronics	STTH1R04UY	400	1	1.6 @ 1 A	Fast ≤500ns	5 @ 400 V	DO-214AA (SMB)	-40 to 175	Active
STMicroelectronics	STTH3R04U	400	3	1.5 @ 3 A	Fast ≤500ns	5 @ 400 V	DO-214AA (SMB)	-55 to 175	Active

Engineering Selection Recommendations

Direct Equivalent Substitutes:

The onsemi MRS1504T3G provides electrical equivalence to the Vishay S2G with identical 400 V / 1.5 A ratings and SMB packaging. However, this part carries "Not For New Designs" product status, limiting its application to legacy system maintenance or replacement scenarios only. The onsemi part exhibits lower forward voltage (1.04 V vs. 1.15 V), which may reduce power dissipation in the application circuit.

The Diodes Incorporated S2G-13-F is an Active product offering direct electrical equivalence at 400 V / 1.5 A with SMB packaging. This part provides extended operating temperature range (-65°C to 150°C) compared to the Vishay original (-55°C to 150°C) and carries ROHS3 compliance certification. The S2G-13-F is suitable for new designs and ongoing production applications.

Uprated Substitutes:

The Diotec Semiconductor S2G (400 V / 2 A) provides higher current capacity while maintaining 400 V reverse voltage and SMB packaging. This part is suitable for applications where circuit current requirements are below 2 A and higher current margin is acceptable. The Diotec part is Active status but carries "Not applicable" RoHS status.

The STMicroelectronics STTH3R04U (400 V / 3 A) offers the highest current rating among available substitutes with Active product status and ROHS3 compliance. This part features fast recovery characteristics (≤500ns, 35 ns trr) and extended temperature range (-55°C to 175°C), suitable for applications requiring higher current capacity and improved switching performance.

Downrated Substitutes:

The STMicroelectronics STTH1R04U and STTH1R04UY (400 V / 1 A) are downrated options with lower current capacity than the original specification. These parts are suitable only for applications where actual circuit current does not exceed 1 A. Both parts feature fast recovery characteristics and Active product status with ROHS3 compliance. The STTH1R04UY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 175°C).

Compliance Considerations:

For new design applications, select from parts with Active product status: Diodes Incorporated S2G-13-F, Diotec Semiconductor S2G, STMicroelectronics STTH1R04U, STTH1R04UY, or STTH3R04U. For RoHS3 compliance requirements, the Diodes Incorporated S2G-13-F, STMicroelectronics STTH1R04U, STTH1R04UY, and STTH3R04U all meet this specification. The onsemi MRS1504T3G is restricted to replacement applications due to "Not For New Designs" status.

Frequently Asked Questions (FAQ)

Q: Can the onsemi MRS1504T3G be used as a direct replacement for the Vishay S2G?

A: The onsemi MRS1504T3G provides electrical equivalence with identical 400 V reverse voltage, 1.5 A current rating, and SMB packaging. However, this part carries "Not For New Designs" product status, restricting its use to legacy system maintenance and component replacement only. For new applications, select an Active-status alternative.

Q: What is the difference between the Diotec S2G and the Vishay S2G?

A: Both parts share the same base product designation but are manufactured by different companies. The Diotec S2G provides higher current capacity (2 A vs. 1.5 A) while maintaining 400 V reverse voltage and SMB packaging. The Diotec part is suitable for applications where the additional current margin is acceptable. Operating temperature range differs slightly (-50°C to 150°C for Diotec vs. -55°C to 150°C for Vishay).

Q: Are the STMicroelectronics STTH1R04U and STTH1R04UY interchangeable?

A: Both parts share identical electrical ratings (400 V / 1 A) and SMB packaging. The STTH1R04UY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 175°C) compared to the STTH1R04U. The STTH1R04UY is suitable for automotive applications; the STTH1R04U is suitable for general industrial applications. Forward voltage differs slightly (1.6 V vs. 1.5 V at rated current).

Q: Can I use the STMicroelectronics STTH3R04U in place of the Vishay S2G?

A: The STTH3R04U provides 400 V reverse voltage and SMB packaging but with higher current capacity (3 A vs. 1.5 A). This uprated substitute is suitable for applications where the circuit current requirement is below 3 A and higher current margin is acceptable. The STTH3R04U features fast recovery characteristics (35 ns trr) and extended temperature range (-55°C to 175°C), offering improved switching performance compared to the standard recovery Vishay part.

Q: Why would I select a downrated substitute like the STMicroelectronics STTH1R04U?

A: Downrated substitutes are selected when the actual circuit current requirement is lower than the original component specification. The STTH1R04U (1 A rating) is suitable for applications where maximum circuit current does not exceed 1 A. This part offers fast recovery characteristics and extended temperature range, which may provide performance benefits despite lower current rating. Downrated substitutes should only be used when circuit analysis confirms current requirements are within the substitute part's rating.

Q: What packaging options are available for these substitute parts?

A: All listed substitute parts utilize DO-214AA (SMB) surface mount packaging, identical to the Vishay S2G. Packaging variations exist in supplier delivery format (Cut Tape, Digi-Reel, or Tape & Reel), but the component package itself remains consistent across all substitutes, ensuring mechanical compatibility in PCB assembly.

Q: Which substitute part offers the best compliance for new designs?

A: The Diodes Incorporated S2G-13-F provides direct electrical equivalence (400 V / 1.5 A) with Active product status, ROHS3 compliance, and extended operating temperature range (-65°C to 150°C). This part is optimized for new design applications requiring compliance certification and long-term supply availability.

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