S4A R7G Equivalent & Substitute Parts

Part Overview

The S4A R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 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.

The S4A R7G features fast recovery characteristics with a recovery time of 500 ns or less at currents exceeding 200 mA, making it suitable for applications requiring rapid switching performance. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and operates across a junction temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A	V
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Capacitance @ Vr, F	60	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S4A R7G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 4 A minimum
Package / Case: DO-214AB (SMC) surface mount
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1

Secondary Compatibility Factors:

Speed classification (Fast Recovery ≤ 500 ns or Standard Recovery > 500 ns)
Forward voltage drop (Vf) at rated current
Reverse recovery time (trr) where specified
Reverse leakage current @ Vr

Substitute parts are grouped into two categories:

Direct Equivalent (Same Current Rating - 4 A): The S4A V7G from Taiwan Semiconductor Corporation maintains identical voltage and current ratings with the same package. The primary difference is recovery speed classification (Standard Recovery vs. Fast Recovery), which does not prevent functional substitution in applications tolerant of slower switching characteristics.

Functional Alternatives (Lower Current Rating - 3 A): Parts rated for 3 A average rectified current (ES3A, ES3A-13-F, ES3A-E3/57T, ES3A-E3/9AT, ES3A-M3/57T, ES3A-M3/9AT, CSFC301-G, CURC301-G) are suitable for applications where the actual circuit current demand does not exceed 3 A. These parts maintain the 50 V voltage rating, DO-214AB package, and surface mount configuration. Most feature fast recovery characteristics with improved reverse recovery times (25–50 ns) compared to the S4A R7G.

Higher Current Alternative (5 A): The CGRC301-G from Comchip Technology provides increased current capacity (5 A) at the same 50 V rating and DO-214AB package, suitable for applications requiring higher current handling with margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Package	Temp Range [°C]	Product Status
S4A R7G	Taiwan Semiconductor Corporation	50	4	1.15 @ 4 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Discontinued
S4A V7G	Taiwan Semiconductor Corporation	50	4	1.15 @ 4 A	Standard Recovery > 500 ns	DO-214AB (SMC)	-55 to 150	Discontinued
ES3A	Taiwan Semiconductor Corporation	50	3	0.95 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
ES3A-13-F	Diodes Incorporated	50	3	0.90 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
ES3A-E3/57T	Vishay General Semiconductor - Diodes Division	50	3	0.90 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
ES3A-E3/9AT	Vishay General Semiconductor - Diodes Division	50	3	0.90 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
ES3A-M3/57T	Vishay General Semiconductor - Diodes Division	50	3	0.90 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
ES3A-M3/9AT	Vishay General Semiconductor - Diodes Division	50	3	0.90 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
CSFC301-G	Comchip Technology	50	3	0.95 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
CURC301-G	Comchip Technology	50	3	1.00 @ 3 A	Fast Recovery ≤ 500 ns	DO-214AB (SMC)	-55 to 150	Active
CGRC501-G	Comchip Technology	50	5	1.15 @ 5 A	Standard Recovery > 500 ns	DO-214AB (SMC)	-55 to 150	Active

Engineering Selection Recommendations

For Direct Current Rating Replacement (4 A):

The S4A V7G is the direct equivalent to the S4A R7G with identical voltage and current specifications. Both parts are discontinued at DiGi Electronics. The S4A V7G differs only in recovery speed classification (Standard Recovery vs. Fast Recovery). Selection of S4A V7G is appropriate for applications where switching speed is not a critical performance parameter. Both parts maintain RoHS3 compliance and identical operating temperature ranges.

For Active Product Substitution with Current Derating (3 A):

The ES3A series from Taiwan Semiconductor Corporation and Vishay General Semiconductor, along with CSFC301-G and CURC301-G from Comchip Technology, are active products suitable for applications where circuit current does not exceed 3 A. These parts offer the following advantages:

Active product status ensures ongoing availability and supply chain continuity
RoHS3 compliance maintained across all alternatives
Fast recovery characteristics (≤ 500 ns) with improved reverse recovery times (25–50 ns) compared to the S4A R7G
Lower forward voltage drops (0.90–1.00 V @ 3 A) reduce power dissipation
Identical DO-214AB package and surface mount configuration
Operating temperature range -55°C to 150°C maintained

Selection among ES3A variants (ES3A, ES3A-13-F, ES3A-E3/57T, ES3A-E3/9AT, ES3A-M3/57T, ES3A-M3/9AT) depends on packaging format requirements (bulk, cut tape, or tape & reel) and supplier availability. All maintain equivalent electrical performance.

For Higher Current Margin (5 A):

The CGRC501-G from Comchip Technology provides 5 A current capacity at 50 V with the same DO-214AB package. This part is suitable for applications requiring additional current headroom. The trade-off is Standard Recovery speed classification (> 500 ns), which may not be suitable for high-frequency switching applications.

Compliance and Regulatory Considerations:

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity level, ensuring compatibility with existing manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the S4A R7G be replaced with the S4A V7G?

A: Yes. The S4A V7G is a direct equivalent with identical voltage (50 V) and current (4 A) ratings in the same DO-214AB package. The primary difference is recovery speed classification: S4A R7G features Fast Recovery (≤ 500 ns), while S4A V7G features Standard Recovery (> 500 ns). Substitution is valid for applications where switching speed is not a limiting design parameter.

Q: Why would I use a 3 A rated diode instead of the 4 A S4A R7G?

A: The 3 A alternatives (ES3A series, CSFC301-G, CURC301-G) are active products with guaranteed long-term availability, whereas the S4A R7G is discontinued. If circuit current demand does not exceed 3 A, these parts provide equivalent functionality with improved performance characteristics (lower forward voltage, faster recovery times) and supply chain continuity.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts listed use the DO-214AB (SMC) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

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

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast Recovery diodes (≤ 500 ns) switch more rapidly, reducing switching losses in high-frequency applications. Standard Recovery diodes (> 500 ns) are suitable for lower-frequency applications and may exhibit lower forward voltage drops. The S4A R7G is Fast Recovery; the S4A V7G is Standard Recovery.

Q: Can I use the CGRC501-G (5 A) in place of the S4A R7G (4 A)?

A: Yes, from a current capacity perspective. The CGRC501-G is rated for 5 A at 50 V in the same DO-214AB package, providing additional current margin. However, the CGRC501-G features Standard Recovery speed (> 500 ns) compared to the S4A R7G's Fast Recovery (≤ 500 ns). Substitution is valid only if the application does not require fast switching characteristics.

Q: What is the difference between ES3A variants (ES3A, ES3A-13-F, ES3A-E3/57T, ES3A-E3/9AT, ES3A-M3/57T, ES3A-M3/9AT)?

A: All ES3A variants maintain identical electrical specifications (50 V, 3 A, Fast Recovery ≤ 500 ns, -55°C to 150°C). Differences are limited to packaging format and supplier: ES3A is bulk packaging from Taiwan Semiconductor Corporation; ES3A-13-F is cut tape from Diodes Incorporated; ES3A-E3/57T and ES3A-E3/9AT are tape & reel from Vishay; ES3A-M3/57T and ES3A-M3/9AT are tape & reel from Vishay. Selection depends on procurement and assembly requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with REACH unaffected status, maintaining compatibility with environmental and regulatory requirements.

Q: What is MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component has unlimited shelf life and does not require special moisture control during storage or handling. All parts listed maintain MSL 1 classification.

Q: Can I use a 3 A diode in a circuit designed for 4 A?

A: Only if the actual circuit current does not exceed 3 A. The 4 A rating of the S4A R7G represents the maximum average rectified current the diode can safely conduct. Using a 3 A rated diode in a circuit that draws 4 A would exceed the diode's current rating and result in excessive heat generation and potential failure. Verify actual circuit current requirements before substitution.

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