S3G R7G Equivalent & Substitute Parts

Part Overview

The S3G R7G is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

The part operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics with reverse recovery time ≤ 500 ns at currents exceeding 200 mA. RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1) support deployment in industrial and commercial applications.

Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating variations in packaging formats and recovery characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Capacitance @ Vr, F	60	pF @ 4 V, 1 MHz
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AB, SMC (mandatory for mechanical compatibility)
Mounting Type: Surface Mount (mandatory)
Operating Temperature - Junction: Range must encompass -55°C to 150°C or equivalent operational envelope

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Tolerance within application-specific limits
Speed Classification: Fast Recovery or Standard Recovery acceptable based on circuit requirements
Current - Reverse Leakage @ Vr: Acceptable within specified operating conditions
Capacitance @ Vr, F: Variation acceptable within circuit design margins
RoHS and REACH Compliance: Regulatory alignment required

Substitute parts are grouped into two categories based on recovery speed characteristics: Fast Recovery variants (ES3G series from Vishay) and Standard Recovery variants (S3G series from Diotec and Diodes Incorporated, RS3G series from Vishay).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Reverse Leakage @ Vr [µA]	Capacitance @ Vr [pF]	Package	Status
S3G R7G	Taiwan Semiconductor Corporation	400	3	1.15 @ 3 A	Fast Recovery ≤ 500 ns	10 @ 400 V	60 @ 4 V, 1 MHz	DO-214AB, SMC	Discontinued
ES3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	Fast Recovery ≤ 500 ns	10 @ 400 V	30 @ 4 V, 1 MHz	DO-214AB, SMC	Active
ES3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	Fast Recovery ≤ 500 ns	10 @ 400 V	30 @ 4 V, 1 MHz	DO-214AB, SMC	Active
RS3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	Fast Recovery ≤ 500 ns	10 @ 400 V	44 @ 4 V, 1 MHz	DO-214AB, SMC	Active
RS3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	Fast Recovery ≤ 500 ns	10 @ 400 V	44 @ 4 V, 1 MHz	DO-214AB, SMC	Active
RS3G-M3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	Fast Recovery ≤ 500 ns	10 @ 400 V	44 @ 4 V, 1 MHz	DO-214AB, SMC	Active
RS3G-M3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	Fast Recovery ≤ 500 ns	10 @ 400 V	44 @ 4 V, 1 MHz	DO-214AB, SMC	Active
S3G	Diotec Semiconductor	400	3	1.15 @ 3 A	Standard Recovery > 500 ns	5 @ 1700 V	—	DO-214AB, SMC	Active
S3G-13-F	Diodes Incorporated	400	3	1.15 @ 3 A	Standard Recovery > 500 ns	10 @ 400 V	40 @ 4 V, 1 MHz	DO-214AB, SMC	Active
S3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.15 @ 2.5 A	Standard Recovery > 500 ns	10 @ 400 V	60 @ 4 V, 1 MHz	DO-214AB, SMC	Active
S3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.15 @ 2.5 A	Standard Recovery > 500 ns	10 @ 400 V	60 @ 4 V, 1 MHz	DO-214AB, SMC	Active

Engineering Selection Recommendations

Fast Recovery Substitutes (Electrical Equivalence with Improved Performance):

ES3G-E3/57T and ES3G-E3/9AT from Vishay General Semiconductor - Diodes Division provide direct electrical substitution with enhanced performance characteristics. Both variants maintain 400 V reverse voltage and 3 A average rectified current ratings. Forward voltage is reduced to 1.1 V at 3 A, and junction capacitance is reduced to 30 pF, offering improved switching performance. Reverse recovery time is specified at 50 ns. Both parts are Active status with ROHS3 compliance and unlimited MSL rating. ES3G-E3/57T is supplied in Cut Tape (CT) packaging with 80,850 units in stock. ES3G-E3/9AT is supplied in Tape & Reel (TR) packaging with 287,100 units in stock.

RS3G variants (RS3G-E3/57T, RS3G-E3/9AT, RS3G-M3/57T, RS3G-M3/9AT) from Vishay maintain voltage and current ratings but exhibit higher forward voltage (1.3 V @ 2.5 A) and longer reverse recovery time (150 ns). These parts are suitable for applications where recovery speed is less critical. All RS3G variants are Active status with ROHS3 compliance. Inventory availability ranges from 846 to 7,818 units across variants.

Standard Recovery Substitutes (Functional Equivalence with Packaging Flexibility):

S3G-E3/57T and S3G-E3/9AT from Vishay General Semiconductor - Diodes Division provide functional substitution with Standard Recovery characteristics (> 500 ns, 2.5 µs specified). Forward voltage matches the original part at 1.15 V @ 2.5 A. Junction capacitance is 60 pF, identical to the original specification. Both parts are Active status with ROHS3 compliance. S3G-E3/57T is supplied in Cut Tape (CT) with 30,400 units in stock. S3G-E3/9AT is supplied in Tape & Reel (TR) with 12,300 units in stock.

S3G from Diotec Semiconductor and S3G-13-F from Diodes Incorporated provide functional equivalence with Standard Recovery characteristics. S3G from Diotec maintains 1.15 V forward voltage @ 3 A with 1.5 µs reverse recovery time and 14,614 units in stock. S3G-13-F from Diodes Incorporated maintains 1.15 V forward voltage @ 3 A with 30,400 units in stock and extended junction temperature range (-65°C to 150°C). Both are Active status with ROHS3 compliance.

Selection Basis:

Choose ES3G variants for applications requiring fast recovery performance and reduced capacitance. Choose RS3G variants where recovery speed is not a limiting factor and cost optimization is prioritized. Choose S3G variants for direct functional replacement with Standard Recovery characteristics and maximum packaging flexibility. All recommended substitutes maintain DO-214AB (SMC) package compatibility, 400 V reverse voltage rating, 3 A current rating, and regulatory compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can ES3G-E3/57T and ES3G-E3/9AT be used interchangeably with S3G R7G?

A: Yes. Both ES3G variants meet or exceed the electrical specifications of S3G R7G. ES3G-E3/57T is supplied in Cut Tape (CT) packaging, while ES3G-E3/9AT is supplied in Tape & Reel (TR) packaging. The choice between them depends on procurement and assembly requirements. Both maintain 400 V reverse voltage, 3 A average rectified current, and DO-214AB (SMC) package compatibility. Forward voltage is improved to 1.1 V, and reverse recovery time is 50 ns.

Q: What is the difference between Fast Recovery and Standard Recovery variants?

A: Fast Recovery variants (ES3G series) exhibit reverse recovery time ≤ 500 ns with specified values of 50 ns. Standard Recovery variants (S3G and RS3G series) exhibit reverse recovery time > 500 ns with specified values ranging from 1.5 µs to 2.5 µs. Fast Recovery diodes are preferred in high-frequency switching applications where reduced switching losses are critical. Standard Recovery diodes are suitable for lower-frequency rectification applications. Both types maintain identical voltage and current ratings for the 400 V / 3 A specification.

Q: Are RS3G variants suitable replacements for S3G R7G?

A: RS3G variants (RS3G-E3/57T, RS3G-E3/9AT, RS3G-M3/57T, RS3G-M3/9AT) maintain 400 V reverse voltage and 3 A average rectified current ratings and are mechanically compatible in DO-214AB (SMC) packages. However, forward voltage is higher at 1.3 V @ 2.5 A compared to 1.15 V @ 3 A for the original part, and reverse recovery time is longer at 150 ns. RS3G variants are suitable for applications where these parameter variations are acceptable and cost optimization is prioritized.

Q: What packaging options are available for substitute parts?

A: Substitute parts are supplied in two packaging formats: Cut Tape (CT) and Tape & Reel (TR). Cut Tape packaging is suitable for manual assembly and small-volume procurement. Tape & Reel packaging is optimized for automated assembly processes and high-volume production. All substitute parts maintain identical DO-214AB (SMC) surface mount package dimensions and land patterns, ensuring mechanical compatibility with the original part.

Q: Do all substitute parts meet RoHS3 compliance?

A: All recommended substitute parts from Vishay General Semiconductor - Diodes Division, Diodes Incorporated, and Diotec Semiconductor are ROHS3 compliant. The original S3G R7G from Taiwan Semiconductor Corporation is also ROHS3 compliant. Compliance status is verified for each part number in the parameter comparison table.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: All substitute parts from Vishay, Diodes Incorporated, and the original part from Taiwan Semiconductor Corporation are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. The S3G variant from Diotec Semiconductor is rated as Not Applicable for MSL.

Q: Which substitute part offers the best inventory availability?

A: ES3G-E3/9AT from Vishay General Semiconductor - Diodes Division offers the highest inventory availability with 287,100 units in stock. This part is supplied in Tape & Reel (TR) packaging and is optimized for high-volume automated assembly. S3G-13-F from Diodes Incorporated offers 30,400 units in stock in Cut Tape (CT) & Digi-Reel® packaging.

Q: Can S3G from Diotec Semiconductor be used as a direct replacement?

A: S3G from Diotec Semiconductor maintains the same voltage (400 V), current (3 A), and forward voltage (1.15 V @ 3 A) specifications as S3G R7G. However, reverse leakage current is specified at 5 µA @ 1700 V rather than 10 µA @ 400 V, and reverse recovery time is 1.5 µs. The part is Active status with 14,614 units in stock. Mechanical compatibility is confirmed through DO-214AB (SMC) package equivalence.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts maintain junction temperature operating ranges of -55°C to 150°C, matching or exceeding the original S3G R7G specification. S3G-13-F from Diodes Incorporated extends the lower temperature limit to -65°C, providing enhanced low-temperature performance. All parts are suitable for industrial and commercial temperature environments.

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