S3G Equivalent & Substitute Parts Reference

Part Overview

The S3G is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This part is classified as obsolete and is no longer recommended for new designs. The product status and RoHS non-compliance designation necessitate identification of functionally equivalent alternatives that meet current manufacturing and regulatory standards while maintaining electrical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the S3G rectifier diode is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Mounting Type: Surface Mount
Package / Case: DO-214AB, SMC (or compatible package variant)
Operating Temperature Range: Minimum -55°C to maximum 150°C

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute values must not exceed the application's forward voltage budget; values at or below 1.3 V @ 2.5 A or 1.15 V @ 2.5 A are acceptable
Current - Reverse Leakage @ Vr: Values at or below 10 µA @ 400 V are acceptable
Recovery Speed: Both standard recovery (>500 ns) and fast recovery (≤500 ns) types are functionally compatible

Compliance Requirements:

RoHS3 Compliant status is required for new designs
REACH Unaffected status must be maintained

Substitute parts are grouped into three categories: direct equivalents (identical base part number with different packaging), upgrade options (different package form factor with equivalent electrical performance), and similar alternatives (different manufacturers with matching electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Packaging Type	Product Status	RoHS Status
S3G	Micro Commercial Co	400 V	3 A	1.2 V @ 3 A	10 µA @ 400 V	DO-214AB, SMC	Bulk	Obsolete	RoHS non-compliant
S3G-TP	Micro Commercial Co	400 V	3 A	1.2 V @ 3 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Not For New Designs	ROHS3 Compliant
RS3G-E3/57T	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.3 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
RS3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.3 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
RS3G-M3/57T	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.3 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
RS3G-M3/9AT	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.3 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
S3G-E3/57T	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.15 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Cut Tape (CT)	Active	ROHS3 Compliant
S3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400 V	3 A	1.15 V @ 2.5 A	10 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
S3GB-13-F	Diodes Incorporated	400 V	3 A	1.15 V @ 3 A	10 µA @ 400 V	DO-214AA, SMB	Tape & Reel (TR)	Active	ROHS3 Compliant
CFRC304-G	Comchip Technology	400 V	3 A	1.3 V @ 3 A	5 µA @ 400 V	DO-214AB, SMC	Tape & Reel (TR)	Active	ROHS3 Compliant
CMR3-04 BK PBFREE	Central Semiconductor Corp	400 V	3 A	1.2 V @ 3 A	5 µA @ 400 V	DO-214AB, SMC	Bulk	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Compatibility (DO-214AB, SMC):

The S3G-E3/57T and S3G-E3/9AT from Vishay General Semiconductor - Diodes Division are the primary recommended substitutes. Both parts maintain identical electrical specifications to the original S3G (400 V, 3 A, DO-214AB package) and carry Active product status with ROHS3 compliance. The S3G-E3/57T is available in Cut Tape packaging with 30,400 units in stock, while S3G-E3/9AT is available in Tape & Reel with 12,300 units in stock. These parts are direct functional equivalents with no design modifications required.

The RS3G series from Vishay (RS3G-E3/57T, RS3G-E3/9AT, RS3G-M3/57T, RS3G-M3/9AT) provides alternative sourcing with Active product status and ROHS3 compliance. These parts feature fast recovery characteristics (≤500 ns, 150 ns trr) compared to the standard recovery of the original S3G, with forward voltage specifications of 1.3 V @ 2.5 A. Fast recovery operation is functionally compatible with standard recovery applications.

The CFRC304-G from Comchip Technology and CMR3-04 BK PBFREE from Central Semiconductor Corp are functionally equivalent alternatives with identical voltage and current ratings in the DO-214AB, SMC package. Both carry Active product status and ROHS3 compliance. The CFRC304-G exhibits lower reverse leakage (5 µA @ 400 V) compared to the original specification (10 µA @ 400 V).

For Package Form Factor Change (DO-214AA, SMB):

The S3GB-13-F from Diodes Incorporated represents an upgrade option with a larger SMB package (DO-214AA) instead of the original SMC package (DO-214AB). This part maintains 400 V, 3 A electrical specifications with Active product status and ROHS3 compliance. The SMB package provides improved thermal dissipation characteristics. PCB layout modifications are required to accommodate the larger package footprint.

Compliance and Regulatory Status:

All recommended substitute parts carry ROHS3 Compliant and REACH Unaffected designations, meeting current regulatory requirements for new designs. The original S3G is RoHS non-compliant and obsolete, making substitution necessary for compliance with manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the S3G be directly replaced with S3G-E3/57T or S3G-E3/9AT without circuit modifications?

A: Yes. Both S3G-E3/57T and S3G-E3/9AT maintain identical electrical specifications (400 V, 3 A, 1.15 V @ 2.5 A forward voltage) and the same DO-214AB, SMC package footprint as the original S3G. No circuit modifications are required. The primary difference is packaging format (Cut Tape versus Tape & Reel) and product status (Active versus Obsolete).

Q: What is the difference between standard recovery and fast recovery diodes in the RS3G series?

A: Standard recovery diodes exhibit recovery times greater than 500 ns, while fast recovery diodes exhibit recovery times of 150 ns or less. Fast recovery diodes reduce switching losses in high-frequency applications. Both types are functionally compatible in circuits designed for the S3G, as the application determines whether fast recovery characteristics provide benefit. The RS3G series (fast recovery) can replace the S3G (standard recovery) without circuit modifications.

Q: Why does the S3GB-13-F use a different package (SMB instead of SMC)?

A: The S3GB-13-F uses the larger DO-214AA, SMB package instead of the DO-214AB, SMC package. The SMB package provides increased surface area for thermal dissipation, which can improve performance in high-current or high-temperature applications. Selection of this part requires PCB layout modifications to accommodate the larger footprint.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 Compliant designation. The original S3G is RoHS non-compliant. Substitution with any of the recommended alternatives ensures compliance with current RoHS3 regulatory requirements.

Q: What is the significance of the forward voltage difference between S3G (1.2 V @ 3 A) and RS3G series (1.3 V @ 2.5 A)?

A: Forward voltage specifications are measured at different current levels. The S3G specification is measured at 3 A, while the RS3G specification is measured at 2.5 A. At equivalent current levels, the actual forward voltage difference is minimal. Both specifications fall within acceptable ranges for general-purpose rectifier applications. Circuit design should account for the specified forward voltage drop at the intended operating current.

Q: Can CFRC304-G or CMR3-04 BK PBFREE be used as substitutes despite different manufacturers?

A: Yes. Both CFRC304-G (Comchip Technology) and CMR3-04 BK PBFREE (Central Semiconductor Corp) meet the critical electrical specifications: 400 V reverse voltage, 3 A average rectified current, and DO-214AB, SMC package compatibility. Both carry Active product status and ROHS3 compliance. These parts are functionally equivalent alternatives from different manufacturers.

Q: What inventory considerations should guide part selection?

A: S3G-E3/57T has the highest inventory availability (30,400 units), followed by S3G-E3/9AT (12,300 units) and S3GB-13-F (34,600 units). RS3G variants have lower inventory levels (846–7,818 units). CFRC304-G and CMR3-04 BK PBFREE have limited inventory (726–852 units). For high-volume production, S3G-E3/57T or S3GB-13-F are preferred based on availability.

Q: Is the S3G-TP a suitable substitute despite "Not For New Designs" status?

A: S3G-TP is electrically identical to the original S3G and carries ROHS3 compliance, making it functionally suitable. However, the "Not For New Designs" designation indicates the manufacturer does not recommend this part for new product development. For new designs, S3G-E3/57T, S3G-E3/9AT, or other Active-status alternatives are preferred.

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