S2A Equivalent & Substitute Parts Reference

Part Overview

The S2A is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The S2A operates across a junction temperature range of -55°C to 150°C and exhibits standard recovery characteristics with a reverse recovery time of 2 µs.

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 @ 2	V @ A
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application requirements
Reverse Recovery Time (trr): Standard or faster recovery acceptable
Current - Reverse Leakage @ Vr: Lower leakage acceptable
Operating Temperature - Junction: Must cover or exceed -55°C to 150°C range

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all critical parameters with standard recovery characteristics) and Enhanced Performance Alternatives (matching all critical parameters with improved recovery characteristics and lower forward voltage drop).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	trr [ns/µs]	Ir @ Vr [µA @ V]	Package	Product Status	RoHS Status
S2A	Micro Commercial Co	50	2	1.15 @ 2	2000 ns	10 @ 50	DO-214AA, SMB	Obsolete	RoHS non-compliant
CGRB201-G	Comchip Technology	50	2	1.1 @ 2	>500 ns	5 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A	YAGEO	50	2	0.95	—	—	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2	25 ns	5 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A-E3/52T	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	30 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A-E3/5BT	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	30 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A-M3/52T	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	30 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2A-M3/5BT	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	30 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2AA-13-F	Diodes Incorporated	50	2	0.92 @ 2	25 ns	5 @ 50	DO-214AC, SMA	Active	ROHS3 Compliant
ES2AHE3_A/H	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	20 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant
ES2AHE3_A/I	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2	20 ns	10 @ 50	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (Standard Recovery):

CGRB201-G from Comchip Technology is the primary direct equivalent. It matches all critical electrical parameters (50 V, 2 A, DO-214AA SMB package) with marginally lower forward voltage (1.1 V vs. 1.15 V) and reduced reverse leakage (5 µA vs. 10 µA). This part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability.

Enhanced Performance Alternatives (Fast Recovery):

ES2A-13-F and ES2AA-13-F from Diodes Incorporated provide fast recovery characteristics (25 ns trr) with lower forward voltage (0.92 V @ 2 A) and reduced reverse leakage (5 µA @ 50 V). Both are ROHS3 compliant with active status. ES2A-13-F maintains the DO-214AA SMB package, while ES2AA-13-F uses the DO-214AC SMA package and is suitable only if the application circuit board layout accommodates the SMA footprint.

Automotive-Grade Alternatives:

ES2AHE3_A/H and ES2AHE3_A/I from Vishay General Semiconductor are automotive-qualified variants (AEC-Q101) with fast recovery (20 ns trr), low forward voltage (0.9 V @ 2 A), and DO-214AA SMB packaging. These parts are ROHS3 compliant and active. Selection of these variants is appropriate for automotive applications or designs requiring automotive-grade component qualification.

Vishay General Semiconductor Series:

ES2A-E3/52T, ES2A-E3/5BT, ES2A-M3/52T, and ES2A-M3/5BT from Vishay General Semiconductor all provide fast recovery (30 ns trr), low forward voltage (0.9 V @ 2 A), and DO-214AA SMB packaging. These parts are ROHS3 compliant with active status. Differences between variants relate to packaging format (Tape & Reel designations) and are suitable for high-volume manufacturing environments.

Compliance Consideration:

The original S2A is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, making them suitable for applications subject to RoHS directives. Selection of any substitute part automatically addresses RoHS compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace S2A with CGRB201-G without circuit modifications?

A: Yes. CGRB201-G matches all critical electrical parameters (50 V reverse voltage, 2 A average rectified current) and uses the identical DO-214AA SMB package. The lower forward voltage (1.1 V vs. 1.15 V) and reduced reverse leakage (5 µA vs. 10 µA) represent improvements that do not require circuit redesign.

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

A: Standard recovery diodes (S2A, CGRB201-G) exhibit reverse recovery times of 500 ns or greater, suitable for general-purpose rectification at lower switching frequencies. Fast recovery diodes (ES2A-13-F, ES2A-E3/52T, ES2AHE3_A/H) exhibit reverse recovery times of 20–30 ns, reducing switching losses and enabling operation at higher frequencies. Fast recovery variants also feature lower forward voltage drops (0.9–0.92 V vs. 1.1–1.15 V).

Q: Can I use ES2AA-13-F as a substitute for S2A?

A: ES2AA-13-F is electrically equivalent but uses the DO-214AC SMA package instead of the DO-214AA SMB package. Substitution is possible only if the application circuit board layout accommodates the SMA footprint. The SMA package is physically smaller than SMB, and PCB redesign may be required.

Q: Are automotive-grade variants (ES2AHE3_A/H, ES2AHE3_A/I) suitable for non-automotive applications?

A: Yes. Automotive-grade parts exceed standard industrial specifications and are fully compatible with non-automotive applications. AEC-Q101 qualification ensures enhanced reliability and stricter manufacturing controls. Selection of automotive-grade variants is appropriate when design margins or reliability requirements justify the additional cost.

Q: What is the significance of RoHS3 compliance on substitute parts?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of lead, cadmium, mercury, and other hazardous materials. The original S2A is RoHS non-compliant. All substitute parts are ROHS3 compliant, making them mandatory for applications subject to RoHS regulations or customer requirements.

Q: How do packaging format designations (Tape & Reel, bulk) affect part selection?

A: Packaging format designations (such as E3/52T, M3/52T, M3/5BT) indicate the supplier's packaging and delivery format for high-volume manufacturing. These designations do not affect electrical performance or PCB compatibility. Selection among variants with identical electrical specifications and package types is driven by procurement volume requirements and supplier availability.

Q: Can I mix standard recovery and fast recovery diodes in the same circuit?

A: Mixing recovery types is not recommended. Standard recovery and fast recovery diodes exhibit different switching characteristics and reverse recovery behavior. Circuits designed for standard recovery diodes may experience increased switching noise or EMI when fast recovery diodes are substituted. Conversely, circuits optimized for fast recovery performance may not benefit from standard recovery diodes. Consistent recovery type selection across all rectifier positions is required.

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

A: All substitute parts operate across a junction temperature range of -55°C to 150°C, matching or exceeding the original S2A specification. This range is suitable for industrial and automotive applications across standard environmental conditions.

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