S4A M6G Equivalent & Substitute Parts

Part Overview

The S4A M6G 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 equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 4 A
Reverse Recovery Time (trr)	1.5 µs
Current - Reverse Leakage @ Vr	100 µA @ 50 V
Capacitance @ Vr, F	60 pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the S4A M6G is determined by the following critical parameters:

Parametric Equivalents maintain identical electrical specifications across all key parameters: 50 V reverse voltage, 4 A average rectified current, 1.15 V forward voltage at 4 A, 1.5 µs reverse recovery time, DO-214AB package, and operating temperature range of -55°C to 150°C. These parts are direct functional replacements with no derating required.

Similar Parts share the same 50 V reverse voltage rating and DO-214AB package but differ in current rating (3 A or 5 A), forward voltage characteristics, or recovery time specifications. These parts are suitable for applications where the current requirement is lower than 4 A or where higher current capability is acceptable. Similar parts with lower current ratings (3 A) require circuit-level evaluation to confirm adequate margin. Similar parts with higher current ratings (5 A) are suitable for direct substitution in applications requiring 4 A or less.

The key parameters determining substitution eligibility are:

Voltage - DC Reverse (Vr) (Max): Must be ≥ 50 V
Package / Case: Must be DO-214AB or compatible SMC variant
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C minimum
Current - Average Rectified (Io): Must be ≥ 4 A for direct substitution

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	trr (µs)	Ir @ Vr	Package	Status
S4A M6G	Taiwan Semiconductor	50 V	4	1.15 V @ 4 A	1.5	100 µA @ 50 V	DO-214AB	Discontinued
S4A	Taiwan Semiconductor	50 V	4	1.15 V @ 4 A	1.5	10 µA @ 50 V	DO-214AB	Active
S4A V7G	Taiwan Semiconductor	50 V	4	1.15 V @ 4 A	1.5	10 µA @ 50 V	DO-214AB	Discontinued
CGRC501-G	Comchip Technology	50 V	5	1.15 V @ 5 A	—	10 µA @ 50 V	DO-214AB	Active
ES3A-13-F	Diodes Incorporated	50 V	3	900 mV @ 3 A	0.025	10 µA @ 50 V	DO-214AB	Active
ES3AB-13-F	Diodes Incorporated	50 V	3	900 mV @ 3 A	0.025	10 µA @ 50 V	DO-214AA	Active
RS3A-13-F	Diodes Incorporated	50 V	3	1.3 V @ 3 A	0.150	5 µA @ 50 V	DO-214AB	Active
RS3A-E3/57T	Vishay General Semiconductor	50 V	3	1.3 V @ 2.5 A	0.150	10 µA @ 50 V	DO-214AB	Active
RS3A-E3/9AT	Vishay General Semiconductor	50 V	3	1.3 V @ 2.5 A	0.150	10 µA @ 50 V	DO-214AB	Active
RS3A-M3/57T	Vishay General Semiconductor	50 V	3	1.3 V @ 2.5 A	0.150	10 µA @ 50 V	DO-214AB	Active
RS3A-M3/9AT	Vishay General Semiconductor	50 V	3	1.3 V @ 2.5 A	0.150	10 µA @ 50 V	DO-214AB	Active

Engineering Selection Recommendations

Parametric Equivalent - Recommended First Choice:

The S4A (active product, Tape & Reel packaging) is the direct parametric equivalent to S4A M6G. This part maintains all electrical specifications including 50 V reverse voltage, 4 A average rectified current, 1.15 V forward voltage at 4 A, and 1.5 µs reverse recovery time. The S4A is ROHS3 compliant and carries MSL 1 rating identical to the original part. This part is currently in active production status and represents the optimal replacement for discontinued S4A M6G applications.

Higher Current Capability - Alternative Option:

The CGRC501-G (Comchip Technology) provides 5 A average rectified current at 50 V reverse voltage in DO-214AB package. This part is suitable for direct substitution in applications requiring 4 A or less, as it provides additional current margin. The CGRC501-G is active and ROHS3 compliant. This option is appropriate when higher current capability is beneficial for circuit reliability.

Lower Current Rating - Derating Required:

Parts rated for 3 A average rectified current (ES3A-13-F, ES3AB-13-F, RS3A-13-F, RS3A-E3/57T, RS3A-E3/9AT, RS3A-M3/57T, RS3A-M3/9AT) are suitable only for applications where the actual circuit current requirement is confirmed to be 3 A or less. These parts are not direct substitutes for 4 A applications without circuit redesign or derating analysis. All 3 A alternatives are active products with ROHS3 compliance.

Package Consideration:

ES3AB-13-F uses DO-214AA (SMB) package, which differs from the DO-214AB (SMC) package of S4A M6G. This part requires PCB layout modification and is not a direct mechanical substitute.

Frequently Asked Questions (FAQ)

Q: Can I use the S4A (active product) as a direct replacement for S4A M6G?

A: Yes. The S4A is a parametric equivalent with identical electrical specifications: 50 V reverse voltage, 4 A average rectified current, 1.15 V forward voltage at 4 A, 1.5 µs reverse recovery time, and DO-214AB package. The only difference is improved reverse leakage current (10 µA versus 100 µA), which is a beneficial change. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between S4A M6G and S4A V7G?

A: Both parts are rated for 50 V, 4 A, with 1.15 V forward voltage and 1.5 µs reverse recovery time in DO-214AB package. The primary difference is reverse leakage current: S4A M6G specifies 100 µA at 50 V, while S4A V7G specifies 10 µA at 50 V. Both are discontinued at DiGi Electronics. The active S4A product is the preferred replacement for either part.

Q: Can I use a 3 A rated diode in place of the 4 A S4A M6G?

A: Only if circuit analysis confirms that the actual operating current is 3 A or less. The 3 A parts (ES3A-13-F, RS3A-13-F, and Vishay RS3A variants) are not rated for 4 A operation. Using a 3 A part in a 4 A application exceeds the component rating and is not acceptable without circuit modification.

Q: What is the difference between ES3A-13-F and ES3AB-13-F?

A: Both parts are rated for 50 V, 3 A with 900 mV forward voltage and 25 ns reverse recovery time. The key difference is package: ES3A-13-F uses DO-214AB (SMC), while ES3AB-13-F uses DO-214AA (SMB). The SMB package is physically larger and requires different PCB footprint. For S4A M6G replacement, ES3A-13-F maintains the original SMC package, but both are limited to 3 A operation.

Q: Is CGRC501-G a suitable replacement for S4A M6G?

A: Yes, for applications requiring 4 A or less. The CGRC501-G is rated for 50 V, 5 A in DO-214AB package, providing higher current capability than the original 4 A specification. This part is active and ROHS3 compliant. The additional current margin makes it suitable for direct substitution.

Q: What does the reverse recovery time difference mean for substitution?

A: The S4A M6G specifies 1.5 µs reverse recovery time (standard recovery). The ES3A-13-F and similar Diodes Incorporated parts specify 25 ns (fast recovery), while Vishay RS3A variants specify 150 ns. Faster recovery time reduces switching losses and is generally beneficial. Slower recovery time is not acceptable as a substitute without circuit analysis confirming compatibility with switching frequency and load conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original S4A M6G specifications.

Q: What packaging options are available for the S4A equivalent?

A: The active S4A product is available in Tape & Reel (TR) packaging. The original S4A M6G packaging specification is not provided in the input data. Tape & Reel is standard for surface mount production environments.

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