S2A Equivalent & Substitute Parts Reference

Part Overview

The S2A is a standard recovery rectifier diode manufactured by onsemi in the DO-214AA (SMB) surface mount package. This device is rated for 50 V DC reverse voltage and 2 A average rectified current, with a maximum forward voltage of 1.15 V at 2 A. The S2A is designated as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or performance optimization within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A rectifier diode is determined by the following critical parameters:

Voltage Rating Compatibility: The reverse voltage rating must equal or exceed 50 V. Substitute parts with lower voltage ratings cannot be used in applications requiring the full 50 V rating.

Current Rating Compatibility: The average rectified current must equal or exceed 2 A. Substitute parts with lower current ratings cannot handle the full 2 A load.

Package Compatibility: The DO-214AA (SMB) surface mount package is the mechanical standard. Substitutes must use the same package to ensure PCB footprint compatibility without redesign.

Technology Type: Standard recovery diodes are interchangeable with other standard recovery diodes. Schottky diodes operate on different principles and are listed for reference but represent a technology change.

Temperature Range: The operating junction temperature range must accommodate the application's thermal requirements. The S2A operates from -65°C to 150°C.

Compliance Requirements: RoHS3 compliance and REACH unaffected status are mandatory for regulated applications.

Substitute parts are grouped into two categories:

Direct Equivalents (50 V, 2 A, SMB Package): Parts meeting all primary electrical and mechanical specifications.
Functional Alternatives (50 V, Lower Current or Different Package): Parts suitable for applications with reduced current requirements or alternative mounting strategies.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Package	Technology	Temp Range	Product Status
S2A	onsemi	50 V	2 A	1.15 V @ 2 A	2 µs	DO-214AA (SMB)	Standard	-65 to 150°C	Not For New Designs
ES2A-13-F	Diodes Incorporated	50 V	2 A	920 mV @ 2 A	25 ns	DO-214AA (SMB)	Standard	-55 to 150°C	Active
S2A-13-F	Diodes Incorporated	50 V	1.5 A	1.15 V @ 1.5 A	—	DO-214AA (SMB)	Standard	-65 to 150°C	Active
S2A-E3/52T	Vishay General Semiconductor	50 V	1.5 A	1.15 V @ 1.5 A	2 µs	DO-214AA (SMB)	Standard	-55 to 150°C	Active
SURS8105T3G-VF01	onsemi	50 V	1 A	875 mV @ 1 A	35 ns	DO-214AA (SMB)	Standard	-65 to 175°C	Active
RS2A-13-F	Diodes Incorporated	50 V	1.5 A	1.3 V @ 1.5 A	150 ns	DO-214AC (SMA)	Standard	-65 to 150°C	Active
ES2A_R1_00001	Panjit International Inc.	50 V	2 A	950 mV @ 2 A	35 ns	DO-214AC (SMA)	Standard	-55 to 150°C	Active
CMSH1-60 TR13 PBFREE	Central Semiconductor Corp	60 V	1 A	700 mV @ 1 A	—	DO-214AA (SMB)	Schottky	-65 to 150°C	Active
MURS120T3G	onsemi	200 V	1 A	875 mV @ 1 A	35 ns	DO-214AA (SMB)	Standard	-65 to 175°C	Active
MRS1504T3G	onsemi	400 V	1.5 A	1.04 V @ 1.5 A	—	DO-214AA (SMB)	Standard	-55 to 150°C	Not For New Designs

Engineering Selection Recommendations

Direct Equivalent Selection:

The ES2A-13-F (Diodes Incorporated) is the primary direct equivalent to the S2A. It matches the 50 V reverse voltage rating and 2 A current rating in the DO-214AA (SMB) package. The ES2A-13-F features improved performance characteristics with a lower forward voltage (920 mV vs. 1.15 V at 2 A) and faster recovery time (25 ns vs. 2 µs). The ES2A-13-F is in Active product status, ensuring long-term availability. Operating temperature range is -55°C to 150°C, which covers most industrial applications within the S2A's -65°C to 150°C range.

Alternative Selection for Reduced Current Applications:

The S2A-E3/52T (Vishay General Semiconductor) and S2A-13-F (Diodes Incorporated) are suitable for applications requiring 1.5 A or less. Both maintain the 50 V rating and DO-214AA (SMB) package. The S2A-E3/52T provides identical forward voltage characteristics (1.15 V @ 1.5 A) and recovery time (2 µs) to the original S2A, ensuring behavioral compatibility. Both parts are in Active product status.

Package Variant Selection:

The ES2A_R1_00001 (Panjit International Inc.) provides 50 V, 2 A capability in the DO-214AC (SMA) package. This part is suitable only if PCB redesign to accommodate the SMA footprint is acceptable. The SMA package is physically smaller than SMB, requiring layout modification.

Higher Voltage Alternatives:

The MURS120T3G (onsemi) and MRS1504T3G (onsemi) provide higher voltage ratings (200 V and 400 V respectively) with reduced current ratings (1 A and 1.5 A). These parts are suitable only for applications where the 50 V rating is not a constraint and lower current is acceptable.

Schottky Technology Alternative:

The CMSH1-60 TR13 PBFREE (Central Semiconductor Corp) is a Schottky diode with 60 V rating and 1 A current. Schottky diodes exhibit lower forward voltage (700 mV @ 1 A) and faster switching characteristics but higher reverse leakage current (500 µA @ 60 V vs. 1 µA for the S2A). Schottky substitution requires application-level verification of leakage current tolerance.

Compliance Verification:

All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the S2A.

Frequently Asked Questions (FAQ)

Q: Can the ES2A-13-F directly replace the S2A without circuit modification?

A: The ES2A-13-F is electrically compatible as a direct replacement. Both parts share the 50 V reverse voltage rating, 2 A current rating, and DO-214AA (SMB) package. The lower forward voltage (920 mV vs. 1.15 V) and faster recovery time (25 ns vs. 2 µs) of the ES2A-13-F represent performance improvements that do not require circuit redesign. The operating temperature range difference (-55°C vs. -65°C minimum) is acceptable for most applications.

Q: What is the difference between the S2A-13-F and S2A-E3/52T?

A: Both parts are rated for 50 V and 1.5 A in the DO-214AA (SMB) package. The S2A-13-F is manufactured by Diodes Incorporated, while the S2A-E3/52T is manufactured by Vishay General Semiconductor. The S2A-E3/52T provides identical forward voltage (1.15 V @ 1.5 A) and recovery time (2 µs) characteristics to the original S2A. The S2A-13-F does not specify recovery time. Both are in Active product status. Selection depends on supplier availability and preferred manufacturer qualification.

Q: Can I use a 1 A rated diode in place of the 2 A S2A?

A: A 1 A rated diode cannot be used in applications requiring 2 A average rectified current. The SURS8105T3G-VF01 and MURS120T3G are both rated for 1 A maximum. Using an undersized current rating will cause excessive junction heating and potential device failure. Current rating must equal or exceed the application requirement.

Q: Why is the CMSH1-60 listed as a substitute if it is a Schottky diode?

A: The CMSH1-60 TR13 PBFREE is listed as a functional alternative for applications where Schottky technology is acceptable. Schottky diodes offer lower forward voltage drop and faster switching, but exhibit significantly higher reverse leakage current (500 µA @ 60 V vs. 1 µA for the S2A). Applications sensitive to leakage current or requiring low reverse bias conditions must verify compatibility before substitution.

Q: Can I use the ES2A_R1_00001 (SMA package) instead of the SMB package S2A?

A: The ES2A_R1_00001 provides equivalent electrical performance (50 V, 2 A) but uses the DO-214AC (SMA) package instead of DO-214AA (SMB). SMA and SMB packages have different footprints and cannot be used interchangeably without PCB redesign. Substitution is possible only if the circuit board layout can be modified to accommodate the SMA footprint.

Q: What is the significance of the "Not For New Designs" status?

A: The S2A designation as "Not For New Designs" indicates that onsemi has discontinued active development and recommends alternative parts for new circuit designs. However, the S2A remains available in inventory (41,896 pcs) for legacy system support and repair applications. For new designs, the ES2A-13-F or S2A-E3/52T are recommended as active alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH unaffected status, matching the regulatory compliance of the original S2A. This ensures compatibility with applications subject to environmental and hazardous substance restrictions.

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

A: Standard recovery diodes exhibit reverse recovery times greater than 500 ns (the S2A has 2 µs). Fast recovery diodes have reverse recovery times of 500 ns or less. Fast recovery diodes (such as the ES2A-13-F with 25 ns) switch more rapidly and generate less switching noise, making them suitable for high-frequency applications. Standard recovery diodes are adequate for lower-frequency rectification. The choice depends on application switching frequency requirements.

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