S3AB R5G Equivalent & Substitute Parts

Part Overview

The S3AB R5G 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 R5G operates with standard recovery characteristics and is suitable for general rectification applications requiring moderate current handling in compact surface mount form factors. Equivalent parts maintain identical or superior electrical performance within the same package family, while substitute parts offer functional alternatives with minor parameter variations.

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 R5G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Operating Temperature Range: Must support -55°C to 150°C junction temperature
RoHS Compliance: Must maintain ROHS3 Compliant status

Secondary Compatibility Factors:

Voltage - Forward (Vf): Lower values indicate improved efficiency; values up to 1.15 V @ 3 A are acceptable
Reverse Recovery Time (trr): Standard recovery (>500 ns) is functionally equivalent; faster recovery (<500 ns) provides superior performance
Current - Reverse Leakage: Lower values indicate superior blocking characteristics
Capacitance: Lower values reduce switching losses

Parts are grouped into three categories:

Parametric Equivalents: Identical electrical specifications and package; direct substitution without circuit modification.

Direct Manufacturer Equivalents: Same base product number with different packaging or tape configuration; functionally identical with packaging differences.

Similar Parts: Same voltage and current ratings with minor parameter variations (forward voltage, recovery time, leakage current); suitable for applications where performance margins exist.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Status
S3AB R5G	Taiwan Semiconductor Corporation	50 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 50 V	DO-214AA (SMB)	Discontinued at DiGi Electronics
S3AB	Diodes Incorporated	50 V	3 A	1.15 V @ 3 A	2 µs	10 µA @ 50 V	DO-214AA (SMB)	Obsolete
S3ABH	Taiwan Semiconductor Corporation	50 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 50 V	DO-214AA (SMB)	Active
S3ABHR5G	Taiwan Semiconductor Corporation	50 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 50 V	DO-214AA (SMB)	Discontinued at DiGi Electronics
S3AB-TP	Micro Commercial Co	50 V	3 A	1.15 V @ 3 A	—	10 µA @ 50 V	DO-214AA (SMB)	Not For New Designs
CGRB301-G	Comchip Technology	50 V	3 A	1.1 V @ 3 A	—	5 µA @ 50 V	DO-214AA (SMB)	Active
CGRB201-G	Comchip Technology	50 V	2 A	1.1 V @ 2 A	—	5 µA @ 50 V	DO-214AA (SMB)	Active
ES2A-13-F	Diodes Incorporated	50 V	2 A	920 mV @ 2 A	25 ns	5 µA @ 50 V	DO-214AA (SMB)	Active
ES2AHE3_A/H	Vishay General Semiconductor - Diodes Division	50 V	2 A	900 mV @ 2 A	20 ns	10 µA @ 50 V	DO-214AA (SMB)	Active
ES2AHE3_A/I	Vishay General Semiconductor - Diodes Division	50 V	2 A	900 mV @ 2 A	20 ns	10 µA @ 50 V	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Parametric Equivalents):

S3ABH (Taiwan Semiconductor Corporation) is the preferred substitute. This part maintains identical electrical specifications to the S3AB R5G, including 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 is currently Active in product status and available in Tape & Reel packaging. It carries AEC-Q101 automotive qualification, providing enhanced reliability documentation. Inventory availability is 698 pieces.

S3ABHR5G (Taiwan Semiconductor Corporation) provides identical electrical and mechanical specifications to the S3AB R5G, including Cut Tape packaging matching the original part configuration. This part is discontinued at DiGi Electronics but maintains 1,797 pieces in inventory. Use this part only when Cut Tape packaging is specifically required and S3ABH Tape & Reel packaging is unsuitable.

Secondary Substitutes (Direct Manufacturer Equivalents):

S3AB (Diodes Incorporated) meets all electrical requirements with 50 V reverse voltage and 3 A current rating. The reverse recovery time is 2 µs, which is within acceptable tolerance for standard recovery applications. Product status is Obsolete; use only when primary substitutes are unavailable. Inventory is 2,400 pieces.

S3AB-TP (Micro Commercial Co) provides identical voltage and current ratings in Tape & Reel packaging. Product status is Not For New Designs; this part is suitable only for legacy system maintenance or when new design qualification is not required.

Alternative Substitutes (Similar Parts with Current Derating):

CGRB301-G (Comchip Technology) is an Active product offering 50 V reverse voltage and 3 A current rating. Forward voltage is 1.1 V @ 3 A, providing superior efficiency compared to the S3AB R5G. Reverse leakage current is 5 µA @ 50 V, indicating superior blocking characteristics. This part is suitable for applications where the 3 A rating is required and performance margins exist. Inventory is 743 pieces.

CGRB201-G (Comchip Technology) is rated for 2 A average rectified current, requiring circuit evaluation to confirm adequate current margin. This part is suitable only for applications where the load current does not exceed 2 A. Forward voltage is 1.1 V @ 2 A. Inventory is 20,272 pieces.

ES2A-13-F (Diodes Incorporated) and ES2AHE3_A/H and ES2AHE3_A/I (Vishay) are rated for 2 A average rectified current and feature fast recovery characteristics (20–25 ns). These parts are suitable only for applications where the load current does not exceed 2 A and where fast recovery performance provides circuit benefit.

Frequently Asked Questions (FAQ)

Q: Can S3ABH be used as a direct replacement for S3AB R5G without circuit modification?

A: Yes. The S3ABH maintains identical electrical specifications: 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 only difference is packaging configuration (Tape & Reel versus Cut Tape). No circuit modification is required.

Q: What is the difference between S3ABH and S3ABHR5G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation and maintain identical electrical specifications. The primary difference is packaging: S3ABH is supplied in Tape & Reel (TR) configuration, while S3ABHR5G is supplied in Cut Tape (CT) configuration. Select based on your assembly process requirements.

Q: Can CGRB301-G replace S3AB R5G in all applications?

A: CGRB301-G meets the voltage (50 V) and current (3 A) requirements and is currently Active in product status. However, verify that your circuit design accommodates the lower forward voltage (1.1 V versus 1.15 V) and lower reverse leakage current (5 µA versus 10 µA). These differences typically provide improved performance but should be confirmed in your specific application.

Q: Why are ES2A and ES2AHE3 parts listed as alternatives if they are rated for only 2 A?

A: These parts are listed as similar alternatives for applications where the actual load current does not exceed 2 A. The S3AB R5G is rated for 3 A, so these 2 A parts are suitable only if your circuit analysis confirms that peak rectified current remains below 2 A with adequate safety margin. These parts offer superior fast recovery characteristics (20–25 ns versus 1.5 µs) that may benefit high-frequency switching applications.

Q: What does "Discontinued at DiGi Electronics" mean for the S3AB R5G?

A: This status indicates that the part is no longer actively distributed through DiGi Electronics but may remain available through other channels or in existing inventory. The S3ABH (Active status) is the recommended replacement for new designs and ongoing procurement.

Q: Are all substitute parts RoHS3 Compliant?

A: Yes. All parts listed in this reference maintain ROHS3 Compliant status and are suitable for applications requiring RoHS compliance.

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

A: AEC-Q101 is an automotive industry qualification standard. The S3ABH carries this qualification, indicating enhanced reliability testing and documentation suitable for automotive and high-reliability applications. The original S3AB R5G does not carry this qualification.

Q: Can I use S3AB-TP for new product designs?

A: No. S3AB-TP carries a "Not For New Designs" status, indicating that the manufacturer does not recommend this part for new applications. Use S3ABH or CGRB301-G for new designs.

Q: What is the difference between DO-214AA and SMB package designations?

A: DO-214AA and SMB refer to the same physical package. DO-214AA is the JEDEC standard designation, while SMB is the industry common name. These terms are interchangeable for this product category.

Q: How do I determine if CGRB201-G (2 A rated) can be used instead of S3AB R5G (3 A rated)?

A: Perform a detailed circuit analysis to determine the maximum average rectified current under worst-case conditions (maximum input voltage, minimum load resistance, maximum ambient temperature). If this analysis confirms that the average rectified current remains below 2 A with a minimum safety margin of 20%, CGRB201-G is suitable. If the analysis shows current approaching or exceeding 2 A, use a 3 A rated part such as S3ABH or CGRB301-G.

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