S3AB M4G Equivalent & Substitute Parts

Part Overview

The S3AB M4G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The S3AB M4G operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 and REACH standards. Standard recovery characteristics with a reverse recovery time of 1.5 µs and forward voltage of 1.15 V at 3 A define its electrical performance envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S3AB M4G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C minimum

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 1.15 V @ 3 A or lower
Reverse Recovery Time (trr): 1.5 µs or faster
Current - Reverse Leakage @ Vr: 10 µA @ 50 V or lower
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts are classified into three substitution categories:

Parametric Equivalents: Identical electrical specifications and package format across all critical parameters. These parts are direct functional replacements.

Direct Manufacturer Equivalents: Parts from different manufacturers with identical part number designation and equivalent electrical performance, differing only in packaging format or product status.

Similar Parts: Components meeting the primary equivalence criteria but with variations in secondary parameters such as forward voltage, reverse recovery time, or reverse leakage current. These parts are suitable for applications where the parameter variation does not impact circuit performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs]	Ir @ Vr [µA]	Package	Product Status	Inventory [Pcs]
S3AB M4G	Taiwan Semiconductor Corporation	50	3	1.15 @ 3 A	1.5	10 @ 50 V	DO-214AA (SMB)	Discontinued at DiGi Electronics	939
S3AB	Diodes Incorporated	50	3	1.15 @ 3 A	2.0	10 @ 50 V	DO-214AA (SMB)	Obsolete	2400
S3AB R5G	Taiwan Semiconductor Corporation	50	3	1.15 @ 3 A	1.5	10 @ 50 V	DO-214AA (SMB)	Discontinued at DiGi Electronics	1154
S3ABH	Taiwan Semiconductor Corporation	50	3	1.15 @ 3 A	1.5	10 @ 50 V	DO-214AA (SMB)	Active	698
S3ABHR5G	Taiwan Semiconductor Corporation	50	3	1.15 @ 3 A	1.5	10 @ 50 V	DO-214AA (SMB)	Discontinued at DiGi Electronics	1797
S3AB-TP	Micro Commercial Co	50	3	1.15 @ 3 A	—	10 @ 50 V	DO-214AA (SMB)	Not For New Designs	1700
CGRB301-G	Comchip Technology	50	3	1.1 @ 3 A	—	5 @ 50 V	DO-214AA (SMB)	Active	743
CGRB201-G	Comchip Technology	50	2	1.1 @ 2 A	—	5 @ 50 V	DO-214AA (SMB)	Active	20272
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	0.025	5 @ 50 V	DO-214AA (SMB)	Active	10400
ES2AA-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	0.025	5 @ 50 V	DO-214AC (SMA)	Active	21393
ES2AHE3_A/H	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	0.020	10 @ 50 V	DO-214AA (SMB)	Active	1038

Engineering Selection Recommendations

Preferred Substitutes (Parametric Equivalents):

The S3ABH manufactured by Taiwan Semiconductor Corporation is the primary recommended substitute. This part maintains identical electrical specifications to the S3AB M4G across all critical parameters: 50 V reverse voltage, 3 A average rectified current, 1.15 V forward voltage at 3 A, and 1.5 µs reverse recovery time. The S3ABH carries Active product status and is available in Tape & Reel packaging with 698 units in stock. This part is qualified to AEC-Q101 automotive standards, providing additional reliability assurance for demanding applications.

The S3AB R5G and S3ABHR5G, both from Taiwan Semiconductor Corporation, are equivalent alternatives with identical electrical performance. Both are available in Cut Tape packaging with 1154 and 1797 units respectively, though both are discontinued at DiGi Electronics.

The S3AB from Diodes Incorporated provides parametric equivalence with a slightly longer reverse recovery time of 2.0 µs compared to 1.5 µs. This part is Obsolete but maintains 2400 units in inventory.

Secondary Substitutes (Direct Manufacturer Equivalents):

The S3AB-TP from Micro Commercial Co is designated as Not For New Designs but maintains electrical equivalence across specified parameters. This part is available in Tape & Reel packaging with 1700 units in stock.

Similar Parts (Current Availability):

The CGRB301-G from Comchip Technology meets the 50 V, 3 A primary equivalence criteria with Active product status. This part exhibits lower forward voltage (1.1 V at 3 A versus 1.15 V) and reduced reverse leakage current (5 µA versus 10 µA), both favorable characteristics. The CGRB301-G is available in Tape & Reel packaging with 743 units in stock.

Not Recommended for Direct Substitution:

The CGRB201-G, ES2A-13-F, ES2AA-13-F, and ES2AHE3_A/H are rated for 2 A average rectified current, below the 3 A requirement of the S3AB M4G. These parts are suitable only for applications where the circuit design permits operation at reduced current ratings. The ES2AA-13-F uses SMA packaging (DO-214AC) rather than SMB (DO-214AA), requiring PCB layout modification.

All recommended substitutes comply with ROHS3 and REACH standards and maintain Moisture Sensitivity Level 1 (Unlimited) classification.

Frequently Asked Questions (FAQ)

Q: Can the S3ABH directly replace the S3AB M4G without circuit modification?

A: Yes. The S3ABH is a parametric equivalent with identical voltage rating (50 V), current rating (3 A), forward voltage (1.15 V @ 3 A), and reverse recovery time (1.5 µs). Both use DO-214AA (SMB) surface mount packaging. No circuit modification is required. The S3ABH is currently Active and available in production quantities.

Q: What is the difference between S3AB R5G and S3ABHR5G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications. S3AB R5G is supplied in Cut Tape packaging, while S3ABHR5G is also supplied in Cut Tape. Both are discontinued at DiGi Electronics. The designation difference reflects internal Taiwan Semiconductor Corporation product line management. Electrical performance is equivalent.

Q: Why is the CGRB301-G listed as a similar part rather than a direct equivalent?

A: The CGRB301-G meets the primary equivalence criteria of 50 V reverse voltage, 3 A average rectified current, and DO-214AA packaging. However, it exhibits lower forward voltage (1.1 V versus 1.15 V) and reduced reverse leakage current (5 µA versus 10 µA). These differences are favorable for circuit performance but represent parameter variations. The CGRB301-G is classified as similar rather than parametric equivalent due to these secondary parameter differences.

Q: Can ES2A-13-F or ES2AHE3_A/H be used as substitutes?

A: These parts are rated for 2 A average rectified current, not 3 A. They are suitable only if the circuit design permits operation at reduced current ratings. The ES2A-13-F and ES2AHE3_A/H offer superior reverse recovery characteristics (25 ns and 20 ns respectively versus 1.5 µs) and lower forward voltage, but the current rating limitation must be evaluated against application requirements.

Q: What is the significance of the AEC-Q101 qualification on the S3ABH?

A: AEC-Q101 qualification indicates the S3ABH meets automotive-grade reliability standards established by the Automotive Electronics Council. This qualification provides assurance of enhanced testing, quality control, and performance consistency. The S3ABH is suitable for automotive and high-reliability applications where such qualification is required or preferred.

Q: Why is the S3AB-TP marked as Not For New Designs?

A: The Not For New Designs status indicates Micro Commercial Co has discontinued active development and promotion of this part. While the S3AB-TP maintains electrical equivalence and is available in inventory, it is not recommended for new circuit designs. Existing designs using this part may continue operation, but new designs should select from Active or Obsolete parts with ongoing manufacturer support.

Q: Does packaging format affect substitution compatibility?

A: Packaging format affects procurement and assembly processes but not electrical compatibility. The S3AB M4G, S3ABH, S3AB R5G, and CGRB301-G all use DO-214AA (SMB) surface mount packages and are mechanically compatible with the same PCB footprint. The ES2AA-13-F uses DO-214AC (SMA) packaging, which requires a different PCB footprint and cannot be used as a direct mechanical substitute without layout redesign.

Q: What inventory considerations apply to substitute selection?

A: The CGRB201-G offers the highest inventory availability at 20272 units, followed by ES2AA-13-F at 21393 units. However, both are rated for 2 A, not 3 A. For 3 A rated parts, the S3AB from Diodes Incorporated offers the highest inventory at 2400 units, followed by S3ABHR5G at 1797 units and S3AB-TP at 1700 units. The S3ABH, the preferred substitute, is available at 698 units.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in the parameter comparison table are ROHS3 compliant and REACH unaffected. Compliance status is consistent across all recommended substitutes and similar parts.

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