S2A-M3/52T Equivalent & Substitute Parts

Part Overview

The S2A-M3/52T is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 50 V DC reverse voltage with 1.5 A average rectified current in a DO-214AA (SMB) package. The part is currently active and widely used in power supply and rectification applications.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when design specifications allow for components with different electrical characteristics within acceptable operating parameters. This reference provides direct substitutes based on electrical ratings and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	V
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A-M3/52T is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage (Vr) of 50 V or greater to ensure safe operation in the same circuit.

Current Rating: Substitute parts must support the required average rectified current (Io). Parts with equal or higher current ratings are acceptable; lower ratings are not suitable.

Package Type: All substitutes must use the DO-214AA (SMB) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Operating Temperature Range: The junction temperature range must encompass the application requirements. The primary part operates from -55°C to 150°C.

Compliance Standards: All parts must maintain ROHS3 compliance and appropriate REACH status for regulatory requirements.

Substitute parts are grouped into two categories:

Direct Parametric Equivalents: Parts with identical or nearly identical electrical specifications and the same packaging format.

Functional Alternatives: Parts with higher current ratings or different recovery characteristics that operate within the same voltage class and package, suitable for applications where the higher current capacity does not create design conflicts.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs/ns]	Package	Product Status	RoHS
S2A-M3/52T	Vishay	50	1.5	1.15 @ 1.5A	1.8 µs	DO-214AA (SMB)	Active	ROHS3
S2A-E3/52T	Vishay	50	1.5	1.15 @ 1.5A	2 µs	DO-214AA (SMB)	Active	ROHS3
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2A	25 ns	DO-214AA (SMB)	Active	ROHS3
ES3AB-13-F	Diodes Incorporated	50	3	0.9 @ 3A	25 ns	DO-214AA (SMB)	Active	ROHS3
RS1AB-13-F	Diodes Incorporated	50	1	1.3 @ 1A	150 ns	DO-214AA (SMB)	Active	ROHS3
S2A	Diotec Semiconductor	50	2	1.15 @ 2A	1.5 µs	DO-214AA (SMB)	Active	ROHS3
S3AB	Diodes Incorporated	50	3	1.15 @ 3A	2 µs	DO-214AA (SMB)	Obsolete	ROHS3
S3AB-TP	Micro Commercial Co	50	3	1.15 @ 3A	Not Specified	DO-214AA (SMB)	Not For New Designs	ROHS3
ES2A	YAGEO	50	Not Specified	0.95	Not Specified	DO-214AA (SMB)	Active	ROHS3

Engineering Selection Recommendations

Primary Equivalent: S2A-E3/52T (Vishay) is the direct parametric equivalent to S2A-M3/52T. Both parts share identical voltage and current ratings, the same forward voltage characteristic, and equivalent recovery time specifications. The primary difference is packaging format: S2A-E3/52T is supplied in Cut Tape (CT) & Digi-Reel® format versus Tape & Reel (TR) for the S2A-M3/52T. Both are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Higher Current Alternatives: ES2A-13-F (2 A) and ES3AB-13-F (3 A) from Diodes Incorporated provide increased current capacity while maintaining the 50 V voltage rating and DO-214AA package. These parts feature fast recovery characteristics (25 ns) compared to the standard recovery of the primary part. These are suitable for applications where the circuit design permits higher current ratings without adverse effects.

Lower Current Alternative: RS1AB-13-F (1 A) from Diodes Incorporated operates at a lower current rating than the primary part. This part is not suitable as a direct substitute for the S2A-M3/52T in applications requiring 1.5 A operation.

Alternative Manufacturer - Same Base Rating: S2A from Diotec Semiconductor provides a 2 A rated part in the same package with comparable forward voltage and recovery characteristics. This part is active and ROHS3 compliant.

Obsolete and Restricted Parts: S3AB (Diodes Incorporated) is marked as obsolete and should not be selected for new designs. S3AB-TP (Micro Commercial Co) is marked as "Not For New Designs" and should be avoided for new applications.

Limited Data Part: ES2A (YAGEO) lacks complete electrical specifications in the provided data and should be used only when full parametric data is independently verified.

Frequently Asked Questions (FAQ)

Q: Can S2A-E3/52T replace S2A-M3/52T directly on the PCB?

A: Yes. Both parts use the DO-214AA (SMB) package with identical pinout and mechanical dimensions. The primary difference is the supply format (Cut Tape & Digi-Reel® versus Tape & Reel). Electrical performance is equivalent for the specified 1.5 A application.

Q: What is the difference between standard recovery and fast recovery diodes in these substitutes?

A: Recovery time affects switching speed. The primary part S2A-M3/52T has a reverse recovery time (trr) of 1.8 µs (standard recovery). Substitutes like ES2A-13-F and ES3AB-13-F have trr of 25 ns (fast recovery). Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification. Selection depends on the application frequency requirements.

Q: Can I use ES2A-13-F (2 A) or ES3AB-13-F (3 A) in place of S2A-M3/52T (1.5 A)?

A: Yes, from an electrical safety perspective. Higher current-rated diodes can operate at lower currents without damage. However, circuit design must be verified to ensure that the different forward voltage characteristics (0.92 V and 0.9 V respectively, versus 1.15 V for the primary part) do not affect voltage regulation or thermal management in the application.

Q: Why is S3AB marked as obsolete?

A: S3AB from Diodes Incorporated is listed with obsolete product status, indicating it is no longer manufactured or supported. New designs should not use this part. S3AB-TP from Micro Commercial Co carries a "Not For New Designs" status for similar reasons.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed in this reference maintain ROHS3 compliance, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the significance of the DO-214AA (SMB) package specification?

A: The DO-214AA package, commonly referred to as SMB (Surface Mount Body), is a standardized surface mount package for rectifier diodes. All parts in this reference use this package, ensuring mechanical and electrical compatibility with PCB layouts designed for the S2A-M3/52T. Package compatibility is essential for direct substitution without PCB redesign.

Q: Can I substitute based on voltage rating alone?

A: No. Voltage rating is necessary but not sufficient for substitution. Current rating, forward voltage, recovery time, and package type must all be verified. A part with a higher voltage rating but lower current capacity is not suitable if the application requires 1.5 A operation.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level. Parts with MSL 1 have unlimited shelf life and do not require special moisture-controlled storage or handling procedures. This simplifies inventory management and reduces component failure risk from moisture absorption.

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