Equivalent & Substitute Parts for S2G

Part Overview

The S2G is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement continuity. The S2G operates across a junction temperature range of -55°C to 150°C with standard recovery characteristics and is RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Speed Classification	Standard Recovery >500ns	-
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the S2G is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must accommodate the application's thermal requirements

Secondary Considerations:

Forward voltage (Vf) characteristics
Reverse recovery time (trr) and speed classification
Reverse leakage current
RoHS and regulatory compliance status

Substitute parts are grouped into two categories:

Direct Current Rating Match (2 A): Parts with identical 2 A current ratings that maintain full electrical equivalence
Lower Current Rating Alternatives (1 A, 1.5 A, 3 A): Parts with different current ratings that may be used in applications with reduced current requirements or where higher current capability is acceptable

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs]	Package	Product Status	RoHS Status
S2G	Micro Commercial Co	400	2	1.15 @ 2 A	2	DO-214AA, SMB	Obsolete	Non-compliant
S2G/1	Vishay General Semiconductor - Diodes Division	400	1.5	1.15 @ 1.5 A	2	DO-214AA, SMB	Active	Non-compliant
CGRB204-G	Comchip Technology	400	2	1.1 @ 2 A	-	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1-04 BK PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	-	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1-04 TR13 PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	-	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1U-04 BK PBFREE	Central Semiconductor Corp	400	1	1.25 @ 1 A	0.05	DO-214AA, SMB	Active	ROHS3 Compliant
CMR1U-04 TR13 PBFREE	Central Semiconductor Corp	400	1	1.25 @ 1 A	0.05	DO-214AA, SMB	Active	ROHS3 Compliant
CMR2U-04 BK PBFREE	Central Semiconductor Corp	400	2	1 @ 2 A	0.05	DO-214AA, SMB	Active	ROHS3 Compliant
CMR2U-04 TR13 PBFREE	Central Semiconductor Corp	400	2	1.4 @ 2 A	0.05	DO-214AA, SMB	Active	ROHS3 Compliant
CMR3U-04M BK PBFREE	Central Semiconductor Corp	400	3	1.25 @ 3 A	0.05	DO-214AA, SMB	Active	ROHS3 Compliant
CMR3U-04M TR13 PBFREE	Central Semiconductor Corp	400	3	1.25 @ 3 A	0.05	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - Exact Current Rating Match:

The CGRB204-G (Comchip Technology) is the preferred direct substitute for the S2G. It maintains identical voltage (400 V) and current (2 A) ratings with the same DO-214AA SMB package. The CGRB204-G is active in production status and ROHS3 compliant, providing regulatory advantage over the obsolete S2G. Forward voltage is slightly lower (1.1 V vs. 1.15 V), resulting in improved thermal performance. This part is available in Tape & Reel packaging with 749 units in stock.

Secondary Substitutes - Reduced Current Rating:

For applications where 2 A current capacity is not required, the following parts provide active production status and ROHS3 compliance:

CMR2U-04 BK PBFREE and CMR2U-04 TR13 PBFREE (Central Semiconductor Corp): Maintain 2 A rating with fast recovery characteristics (50 ns trr). Available in bulk and Tape & Reel packaging. The TR13 variant offers 3,186 units in stock.
CMR1U-04 BK PBFREE and CMR1U-04 TR13 PBFREE (Central Semiconductor Corp): Rated for 1 A with fast recovery (50 ns trr). Suitable for lower-current applications. The TR13 variant has 15,078 units in stock.
CMR3U-04M BK PBFREE and CMR3U-04M TR13 PBFREE (Central Semiconductor Corp): Rated for 3 A with fast recovery (50 ns trr). The TR13 variant uses DO-214AB SMC package instead of SMB, requiring PCB layout modification.

Compliance Considerations:

All recommended substitutes except S2G/1 are ROHS3 compliant. If RoHS compliance is a design requirement, CGRB204-G or any CMR series part from Central Semiconductor Corp is suitable. The S2G/1 (Vishay) maintains the same RoHS non-compliant status as the original part.

Packaging Variants:

Central Semiconductor Corp parts are available in both Bulk (BK) and Tape & Reel (TR13) packaging. Tape & Reel variants generally offer higher inventory availability and are preferred for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 A rated diode (CMR1U-04) as a substitute for the 2 A rated S2G?

A: No. The CMR1U-04 is rated for maximum 1 A average rectified current, while the S2G is rated for 2 A. Using a lower-rated component in a 2 A application will cause the diode to exceed its maximum current specification, resulting in thermal stress, reduced reliability, and potential failure. Current rating substitution is only acceptable when the substitute part's current rating equals or exceeds the original part's rating.

Q: What is the difference between CMR2U-04 BK PBFREE and CMR2U-04 TR13 PBFREE?

A: Both parts are electrically identical 400 V, 2 A rectifier diodes with identical electrical characteristics. The difference is packaging format: BK denotes Bulk packaging, while TR13 denotes Tape & Reel packaging. Tape & Reel is standard for automated pick-and-place assembly, while Bulk packaging is used for manual assembly or lower-volume applications. TR13 variants typically have higher inventory availability.

Q: Is the CGRB204-G a direct replacement for the S2G?

A: Yes. The CGRB204-G is a direct replacement. Both parts are rated for 400 V reverse voltage and 2 A average rectified current in DO-214AA SMB surface mount packages. The CGRB204-G has lower forward voltage (1.1 V vs. 1.15 V) and is ROHS3 compliant, making it superior to the obsolete S2G in both performance and regulatory status.

Q: Why does the CMR3U-04M TR13 PBFREE use a different package (DO-214AB SMC) instead of DO-214AA SMB?

A: The CMR3U-04M TR13 PBFREE is rated for 3 A, which requires a larger package to handle the increased current and thermal dissipation. The DO-214AB SMC package is physically larger than DO-214AA SMB. If this part is selected, PCB layout modifications are required to accommodate the different footprint. The CMR3U-04M BK PBFREE variant maintains the DO-214AA SMB package.

Q: What does "Fast Recovery =< 500ns" mean compared to "Standard Recovery >500ns"?

A: Recovery time refers to how quickly the diode transitions from conducting to blocking state when reverse voltage is applied. Fast recovery (≤ 500 ns) diodes switch faster than standard recovery (> 500 ns) diodes. Fast recovery diodes reduce switching losses and are preferred in high-frequency applications. The S2G uses standard recovery, while most CMR series substitutes use fast recovery, providing improved efficiency in switching applications.

Q: Can I substitute the S2G with a higher-rated part like CMR3U-04M?

A: Yes. A 3 A rated diode can be used in an application designed for 2 A. The higher current rating provides additional safety margin and thermal headroom. However, the larger package (DO-214AB SMC) requires PCB layout changes. For direct footprint compatibility without layout modification, use CGRB204-G or CMR2U-04 series parts.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliant parts are required for many applications, particularly in consumer electronics and regulated industries. The S2G is RoHS non-compliant, while CGRB204-G and all CMR series parts are ROHS3 compliant, making them suitable for RoHS-regulated applications.

Q: Are there any thermal performance differences between the S2G and CGRB204-G?

A: Yes. The CGRB204-G has lower forward voltage (1.1 V vs. 1.15 V at 2 A), resulting in lower power dissipation and reduced junction temperature during operation. This provides improved thermal performance and extended component life in the same thermal environment.

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