S4B R7G Equivalent & Substitute Parts

Part Overview

The S4B R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 4 A average rectified current in a DO-214AB (SMC) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 100 V
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the S4B R7G is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Package / Case: DO-214AB (SMC)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Current Rating Considerations: The S4B R7G is rated for 4 A average rectified current. Substitute parts are grouped into two categories:

Direct Current Rating Match (4 A): CGRC502-G provides identical 4 A current rating with 100 V reverse voltage in DO-214AB package.
Lower Current Rating (3 A): CSFC302-G, CURC302-G, ES3B, ES3B-13-F, ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, and ES3B-M3/9AT all provide 3 A current rating. These are suitable for applications where the circuit design accommodates the reduced current capacity.

Forward Voltage Characteristics: Forward voltage specifications vary among substitutes. The S4B R7G specifies 1.15 V @ 4 A. Substitute parts with 3 A ratings specify forward voltages between 900 mV and 1.0 V @ 3 A, reflecting different semiconductor technologies.

Recovery Speed: The S4B R7G is classified as Fast Recovery (≤ 500ns, > 200mA). All identified substitutes maintain this fast recovery characteristic, with reverse recovery times (trr) ranging from 25 ns to 50 ns where specified.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Speed	Package	Product Status
S4B R7G	Taiwan Semiconductor Corporation	100 V	4	1.15 V @ 4 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Discontinued
CGRC502-G	Comchip Technology	100 V	5	1.15 V @ 5 A	Standard Recovery >500ns	DO-214AB (SMC)	Active
CSFC302-G	Comchip Technology	100 V	3	950 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
CURC302-G	Comchip Technology	100 V	3	1.0 V @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B	Taiwan Semiconductor Corporation	100 V	3	950 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B-13-F	Diodes Incorporated	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B-E3/57T	Vishay General Semiconductor - Diodes Division	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B-E3/9AT	Vishay General Semiconductor - Diodes Division	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B-M3/57T	Vishay General Semiconductor - Diodes Division	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3B-M3/9AT	Vishay General Semiconductor - Diodes Division	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AB (SMC)	Active
ES3BB-13-F	Diodes Incorporated	100 V	3	900 mV @ 3 A	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Primary Substitute - Current Rating Match: CGRC502-G is the only identified substitute with a current rating equal to or exceeding the S4B R7G (5 A vs. 4 A). This part maintains 100 V reverse voltage rating and DO-214AB package compatibility. However, CGRC502-G is classified as Standard Recovery (>500ns) rather than Fast Recovery, representing a trade-off in switching characteristics. This part is Active status with ROHS3 compliance.

Secondary Substitutes - Reduced Current Rating (3 A): For applications where 3 A current capacity is acceptable, multiple active alternatives exist:

Comchip Technology: CSFC302-G and CURC302-G both provide 100 V, 3 A, DO-214AB package with Fast Recovery characteristics and Active product status. CSFC302-G specifies 950 mV forward voltage; CURC302-G specifies 1.0 V forward voltage.
Taiwan Semiconductor Corporation: ES3B provides 100 V, 3 A, DO-214AB package with Fast Recovery and identical operating temperature range (-55°C ~ 150°C) to the original part. This maintains manufacturer continuity.
Diodes Incorporated: ES3B-13-F provides 100 V, 3 A, DO-214AB package with Fast Recovery and the lowest forward voltage specification (900 mV @ 3 A) among 3 A alternatives.
Vishay General Semiconductor - Diodes Division: ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, and ES3B-M3/9AT all provide 100 V, 3 A, DO-214AB package with Fast Recovery and 900 mV forward voltage. These differ in packaging format (Cut Tape vs. Tape & Reel).

Package Consideration: ES3BB-13-F is a 3 A substitute with identical electrical specifications to ES3B-13-F but uses DO-214AA (SMB) package instead of DO-214AB (SMC). This part is not recommended as a direct substitute due to package incompatibility with the original SMC footprint.

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings.

Frequently Asked Questions (FAQ)

Q: Can CGRC502-G directly replace S4B R7G in all applications?

A: CGRC502-G matches the 100 V reverse voltage and DO-214AB package requirements. However, it provides 5 A current capacity (exceeding the 4 A requirement) and is classified as Standard Recovery (>500ns) rather than Fast Recovery (≤500ns). Applications sensitive to switching speed characteristics should evaluate this trade-off.

Q: Why are 3 A rated parts listed as substitutes for a 4 A part?

A: The 3 A substitutes (CSFC302-G, CURC302-G, ES3B, ES3B-13-F, and Vishay variants) are listed because they share the same 100 V reverse voltage rating, DO-214AB package, and Fast Recovery speed classification. Circuit designs operating at or below 3 A can use these parts. Designs requiring the full 4 A capacity must use CGRC502-G or equivalent 4+ A rated alternatives.

Q: What is the difference between ES3B variants from Vishay (E3/57T, E3/9AT, M3/57T, M3/9AT)?

A: All four Vishay variants (ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, ES3B-M3/9AT) provide identical electrical specifications: 100 V, 3 A, 900 mV forward voltage, Fast Recovery, and DO-214AB package. The differences are in packaging format: E3/57T and M3/57T are supplied in Cut Tape (CT); E3/9AT and M3/9AT are supplied in Tape & Reel (TR). Selection depends on procurement and assembly requirements.

Q: Is ES3BB-13-F a suitable substitute?

A: ES3BB-13-F provides identical electrical specifications to ES3B-13-F (100 V, 3 A, 900 mV forward voltage, Fast Recovery) but uses DO-214AA (SMB) package instead of DO-214AB (SMC). This package difference makes it incompatible with the original S4B R7G footprint. Use only if PCB layout accommodates SMB package.

Q: Which substitute offers the lowest forward voltage drop?

A: ES3B-13-F, ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, and ES3B-M3/9AT all specify 900 mV forward voltage @ 3 A, the lowest among identified substitutes. ES3B specifies 950 mV @ 3 A. CURC302-G specifies 1.0 V @ 3 A. CSFC302-G specifies 950 mV @ 3 A.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original S4B R7G environmental certifications.

Q: What is the inventory status of these substitutes?

A: All identified substitutes are listed as Active product status with current inventory availability. CGRC502-G has 865 pieces in stock. The 3 A alternatives range from 687 to 126,199 pieces in stock depending on manufacturer and packaging format.

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