S3AB Equivalent & Substitute Parts Reference

Part Overview

The S3AB is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMB (DO-214AA) package. Manufactured by SMC Diode Solutions, this component is classified as Active and employs standard recovery technology with a reverse recovery time of 2.5 µs. The S3AB serves applications requiring moderate current rectification in compact surface mount form factors.

Substitute parts become necessary when the original S3AB from SMC Diode Solutions is unavailable or when design requirements permit operation with alternative electrical characteristics within specified tolerance ranges. The substitute parts listed maintain compatibility through equivalent voltage ratings, comparable current handling, and identical or compatible package geometries.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the S3AB is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 50 V or greater to ensure equivalent reverse bias protection.

Current Rating: Substitute parts with current ratings of 3 A or greater are considered direct equivalents. Parts rated at 2 A are acceptable substitutes only when circuit design permits operation at reduced current capacity.

Package Compatibility: The S3AB uses the DO-214AA (SMB) surface mount package. Substitute parts must use either DO-214AA (SMB) or DO-214AC (SMA) packages to maintain PCB layout compatibility. SMA packages (DO-214AC) are mechanically compatible with SMB footprints due to similar lead geometry.

Recovery Characteristics: Standard recovery technology (trr > 500 ns) is the baseline specification. Fast recovery diodes (trr ≤ 500 ns) are acceptable substitutes and provide improved switching performance.

Temperature Range: Operating temperature ranges must encompass the application requirements. The S3AB operates from -65°C to 150°C; substitute parts with narrower ranges remain acceptable if the application operates within those bounds.

Compliance: All substitute parts must maintain ROHS3 compliance and EAR99 export classification to ensure regulatory equivalence.

Parameter Comparison

Parameter	S3AB (SMC)	ES2AA-13-F	S2A (Diotec)	S3AB (Diodes Inc)	S3AB-TP
Manufacturer	SMC Diode Solutions	Diodes Incorporated	Diotec Semiconductor	Diodes Incorporated	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	2 A	2 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	920 mV @ 2 A	1.15 V @ 2 A	1.15 V @ 3 A	1.15 V @ 3 A
Reverse Recovery Time (trr)	2.5 µs	25 ns	1.5 µs	2 µs	Not Specified
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AC, SMA	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	Not Specified
Product Status	Active	Active	Active	Obsolete	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (3 A Rating, Active Status):

The S3AB-TP manufactured by Micro Commercial Co is a direct functional equivalent with identical 50 V, 3 A specifications and DO-214AA (SMB) package compatibility. However, this part carries a "Not For New Designs" status, limiting its use to legacy system maintenance or existing inventory applications.

The S3AB from Diodes Incorporated maintains identical electrical specifications (50 V, 3 A, DO-214AA package) but is classified as Obsolete. This part should be used only when existing designs require exact part number matching or when substitute inventory is exhausted.

Reduced Current Substitutes (2 A Rating, Active Status):

The S2A from Diotec Semiconductor and ES2AA-13-F from Diodes Incorporated both operate at 2 A, which is 33% below the S3AB rating. These parts are acceptable substitutes only when circuit design analysis confirms that maximum operating current does not exceed 2 A. Both parts maintain 50 V reverse voltage rating and ROHS3 compliance.

The S2A uses the DO-214AA (SMB) package, providing identical PCB footprint compatibility. The ES2AA-13-F uses the DO-214AC (SMA) package, which is mechanically compatible with SMB layouts but requires verification of PCB land pattern dimensions.

Recovery Technology Consideration:

The ES2AA-13-F exhibits fast recovery characteristics (trr = 25 ns) compared to the S3AB standard recovery (trr = 2.5 µs). Fast recovery diodes reduce switching losses and are suitable for high-frequency applications. This substitution is valid when improved switching performance is beneficial or neutral to circuit operation.

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory equivalence to the original S3AB. The ES2AA-13-F carries "REACH Unaffected" status, while the S3AB is "REACH Affected"; this distinction does not affect component functionality but may influence supply chain documentation requirements.

Frequently Asked Questions (FAQ)

Q: Can the ES2AA-13-F substitute for the S3AB in all applications?

A: The ES2AA-13-F is electrically compatible at 50 V reverse voltage but is rated for 2 A instead of 3 A. Substitution is valid only when maximum circuit current does not exceed 2 A. The ES2AA-13-F uses a DO-214AC (SMA) package instead of DO-214AA (SMB); verify PCB land pattern compatibility before substitution.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: Both packages are surface mount diode packages with similar lead geometry and pitch. DO-214AA (SMB) is larger than DO-214AC (SMA). The ES2AA-13-F in SMA package can be mounted on SMB footprints due to compatible lead spacing, but PCB land pattern dimensions must be verified to ensure proper solder joint formation.

Q: Why is the S3AB from Diodes Incorporated listed as Obsolete?

A: Product status reflects manufacturer lifecycle decisions. Obsolete parts may still be available from inventory but are no longer manufactured. For new designs, use the S3AB-TP or select an active substitute part such as S2A or ES2AA-13-F based on current requirements.

Q: Can I use the S3AB-TP in new designs?

A: The S3AB-TP carries a "Not For New Designs" status, indicating the manufacturer recommends against use in new applications. This part is suitable for legacy system maintenance or replacement in existing designs but should not be selected for new product development.

Q: How does reverse recovery time affect diode selection?

A: Reverse recovery time (trr) determines switching speed. The S3AB has trr = 2.5 µs (standard recovery), while ES2AA-13-F has trr = 25 ns (fast recovery). Fast recovery diodes reduce switching losses in high-frequency circuits. Standard recovery diodes are adequate for low-frequency rectification applications. Selection depends on circuit operating frequency and efficiency requirements.

Q: Are all substitute parts available in the same packaging format?

A: No. The S3AB is available in bulk packaging, while ES2AA-13-F is supplied in Tape & Reel (TR) format. S3AB-TP is also supplied in Tape & Reel. Verify packaging format compatibility with assembly equipment and procurement requirements before substitution.

Q: What is the minimum operating temperature range for substitute parts?

A: The S3AB operates from -65°C to 150°C. Substitute parts have narrower ranges: ES2AA-13-F and S3AB (Diodes Inc) operate from -55°C to 150°C, while S2A operates from -50°C to 150°C. Substitution is valid if the application operates within the substitute part's temperature range.

Q: Do all substitute parts meet ROHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant, ensuring equivalent environmental and regulatory compliance to the original S3AB.

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