S3AB-13 Equivalent & Substitute Parts

Part Overview

The S3AB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for existing designs and new production requirements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A
Current - Reverse Leakage @ Vr	10 µA @ 50 V
Speed	Standard Recovery >500ns, > 200mA (Io)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Standard

Substitute Part Grouping Explanation

Substitution of the S3AB-13 is determined by electrical parameter equivalence and mechanical compatibility. The critical parameters that define substitutability are:

Voltage Rating: 50 V DC reverse voltage (Vr) maximum
Current Rating: 3 A average rectified current (Io)
Forward Voltage: Maximum 1.15 V @ 3 A (or lower)
Reverse Leakage: Maximum 10 µA @ 50 V (or lower)
Recovery Speed: Standard recovery >500ns, > 200mA (Io)
Package: DO-214AA / SMB surface mount configuration
Temperature Range: -65°C to 150°C junction operating temperature

Substitute parts must meet or exceed all electrical specifications and maintain identical package and mounting characteristics. Parts are grouped by manufacturer and product status to facilitate selection based on availability and design phase requirements.

Parameter Comparison

Parameter	S3AB-13 (Main)	S3AB-13-F	CGRB301-G	S3AB-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	Comchip Technology	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	1.15 V @ 3 A	1.1 V @ 3 A	1.15 V @ 3 A
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	150°C (Max)	Not specified
Product Status	Discontinued at DiGi Electronics	Active	Active	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production and New Designs:

S3AB-13-F (Diodes Incorporated) is the primary substitute for the discontinued S3AB-13. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The S3AB-13-F is available in Cut Tape and Digi-Reel packaging with 38,200 units in stock, providing supply continuity for production requirements.

Alternative Selection:

CGRB301-G (Comchip Technology) provides equivalent electrical performance with improved reverse leakage characteristics (5 µA versus 10 µA @ 50 V) and lower forward voltage (1.1 V versus 1.15 V @ 3 A). This part is ROHS3 compliant and active, though inventory is limited to 743 units. The CGRB301-G is supplied in Tape & Reel packaging.

Legacy Design Support:

S3AB-TP (Micro Commercial Co) maintains electrical equivalence to the original S3AB-13 but carries a "Not For New Designs" status. This part is ROHS3 compliant with 1,700 units available in Tape & Reel packaging. Use of S3AB-TP is restricted to existing designs requiring component replacement where design revision is not feasible.

Frequently Asked Questions (FAQ)

Q: Can S3AB-13-F directly replace S3AB-13 in existing PCB designs?

A: Yes. The S3AB-13-F is electrically and mechanically identical to the S3AB-13, with identical voltage rating (50 V), current rating (3 A), forward voltage (1.15 V @ 3 A), and DO-214AA SMB package configuration. No PCB layout modifications are required.

Q: What is the difference between S3AB-13-F and CGRB301-G?

A: Both parts meet the 50 V / 3 A specification and use the DO-214AA SMB package. CGRB301-G offers superior reverse leakage performance (5 µA versus 10 µA @ 50 V) and lower forward voltage (1.1 V versus 1.15 V @ 3 A). Electrical performance differences are within typical application tolerances for general-purpose rectification.

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

A: S3AB-TP carries a legacy product status indicating that the manufacturer does not recommend this part for new design implementations. This part is available for replacement in existing designs only. New designs should use S3AB-13-F or CGRB301-G.

Q: Are all substitute parts RoHS compliant?

A: S3AB-13-F, CGRB301-G, and S3AB-TP are all ROHS3 compliant. The original S3AB-13 is RoHS non-compliant. Substitution to any of these alternatives satisfies RoHS compliance requirements for new production.

Q: What packaging options are available for each substitute?

A: S3AB-13-F is supplied in Cut Tape (CT) and Digi-Reel packaging. CGRB301-G and S3AB-TP are supplied in Tape & Reel (TR) packaging. Packaging selection depends on production equipment and assembly process requirements.

Q: Do all substitute parts operate across the same temperature range?

A: S3AB-13-F operates across -65°C to 150°C junction temperature, matching the original S3AB-13. CGRB301-G specifies 150°C maximum without a minimum temperature specification. S3AB-TP does not provide operating temperature range data. For applications requiring full -65°C to 150°C operation, S3AB-13-F is the recommended selection.

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