S3A Equivalent & Substitute Parts Reference

Part Overview

The S3A is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. The device operates across a junction temperature range of -55°C to 150°C and features standard recovery characteristics with reverse recovery time exceeding 500 ns.

The S3A is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Specification
Voltage - DC Reverse (Vr) (Max)	50 V	Maximum reverse voltage rating
Current - Average Rectified (Io)	3 A	Maximum average forward current
Voltage - Forward (Vf) (Max)	1.2 V @ 3 A	Forward voltage drop at rated current
Speed	Standard Recovery >500ns, > 200mA (Io)	Reverse recovery classification
Current - Reverse Leakage @ Vr	10 µA @ 50 V	Reverse saturation current
Mounting Type	Surface Mount	SMD assembly method
Package / Case	DO-214AB, SMC	Physical form factor
Operating Temperature - Junction	-55°C ~ 150°C	Thermal operating range
RoHS Status	RoHS non-compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Moisture handling classification

Substitute Part Grouping Explanation

Substitution of the S3A is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 3 A
Mounting Type: Surface Mount
Package / Case: DO-214AB (SMC) or compatible surface mount package
Operating Temperature - Junction: Minimum -55°C to 150°C range

Substitution Categories:

Direct Equivalents maintain identical electrical ratings and package specifications. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgrade Substitutes provide enhanced performance characteristics while maintaining the same voltage and current ratings. These include improved forward voltage characteristics, faster recovery times, or superior compliance status. Package form factor may differ (SMB vs. SMC) but remains surface mount compatible.

Similar Alternatives meet the core electrical requirements (50 V, 3 A) with variations in secondary parameters such as reverse recovery time, forward voltage drop, or reverse leakage current. These parts are functionally suitable for the same application class.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	Speed	Package	Temp Range	RoHS Status	Product Status
S3A	Micro Commercial Co	50 V	3 A	1.2 V @ 3 A	Standard Recovery >500ns	DO-214AB (SMC)	-55°C ~ 150°C	RoHS non-compliant	Obsolete
RS3A-E3/57T	Vishay General Semiconductor	50 V	3 A	1.3 V @ 2.5 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
RS3A-E3/9AT	Vishay General Semiconductor	50 V	3 A	1.3 V @ 2.5 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
S3A-E3/57T	Vishay General Semiconductor	50 V	3 A	1.15 V @ 2.5 A	Standard Recovery >500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
S3A-E3/9AT	Vishay General Semiconductor	50 V	3 A	1.15 V @ 2.5 A	Standard Recovery >500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
S3AB-13-F	Diodes Incorporated	50 V	3 A	1.15 V @ 3 A	Standard Recovery >500ns	DO-214AA (SMB)	-65°C ~ 150°C	ROHS3 Compliant	Active
CSFC301-G	Comchip Technology	50 V	3 A	950 mV @ 3 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
CURC301-G	Comchip Technology	50 V	3 A	1.0 V @ 3 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
ES3A	Taiwan Semiconductor Corporation	50 V	3 A	950 mV @ 3 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
ES3A-13-F	Diodes Incorporated	50 V	3 A	900 mV @ 3 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active
ES3A-E3/57T	Vishay General Semiconductor	50 V	3 A	900 mV @ 3 A	Fast Recovery ≤500ns	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Characteristics and Package):

The Vishay S3A-E3/57T and S3A-E3/9AT maintain identical electrical specifications to the original S3A while offering ROHS3 compliance and active product status. These parts are recommended for applications requiring standard recovery characteristics and are available in high volume (15,100 and 775 units respectively).

For Compliance-Driven Applications:

All substitute parts listed are ROHS3 compliant, addressing the environmental compliance limitation of the obsolete S3A. Selection among compliant alternatives depends on secondary performance requirements and packaging constraints.

For Enhanced Performance (Faster Recovery):

The Vishay RS3A-E3/57T and RS3A-E3/9AT provide fast recovery characteristics (≤500 ns) compared to the standard recovery of the original S3A. These parts are suitable for applications where reduced reverse recovery time improves circuit efficiency or reduces switching losses.

For Optimized Forward Voltage Drop:

The ES3A-13-F (Diodes Incorporated) and ES3A-E3/57T (Vishay) offer the lowest forward voltage drop at 900 mV @ 3 A, compared to 1.2 V for the original S3A. These parts reduce power dissipation in high-current applications.

For Package Flexibility:

The S3AB-13-F (Diodes Incorporated) provides an upgrade option with SMB package (DO-214AA) instead of SMC (DO-214AB), offering a larger form factor with improved thermal characteristics and extended temperature range (-65°C to 150°C).

For Cost-Optimized Selection:

The CSFC301-G and CURC301-G (Comchip Technology) and ES3A (Taiwan Semiconductor Corporation) provide active alternatives with high inventory availability and fast recovery characteristics at competitive specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the S3A with any of the listed substitute parts?

A: Direct replacement is possible only with parts maintaining identical package specifications (DO-214AB SMC) and electrical ratings (50 V, 3 A). The Vishay S3A-E3/57T and S3A-E3/9AT are direct equivalents. Other parts may require PCB layout verification if package dimensions differ.

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

A: Standard recovery diodes have reverse recovery time exceeding 500 ns, while fast recovery diodes have reverse recovery time of 500 ns or less. Fast recovery diodes reduce switching losses and are suitable for higher-frequency applications. The original S3A uses standard recovery; fast recovery alternatives (RS3A series, ES3A series, Comchip parts) are suitable for applications where reduced switching losses are beneficial.

Q: Does the forward voltage difference between parts affect circuit performance?

A: Forward voltage drop varies from 900 mV to 1.3 V across the substitute parts. In high-current applications, lower forward voltage reduces power dissipation and heat generation. The ES3A-13-F at 900 mV @ 3 A dissipates less power than the original S3A at 1.2 V @ 3 A. Circuit design must account for this variation if voltage regulation or thermal management is critical.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original S3A is RoHS non-compliant. For applications requiring environmental compliance certification, any of the substitute parts satisfy this requirement.

Q: What is the difference between SMC and SMB packages?

A: SMC (DO-214AB) and SMB (DO-214AA) are both surface mount packages with different physical dimensions. SMB is larger and provides improved thermal performance. The S3AB-13-F uses SMB packaging. PCB layout and thermal requirements determine which package is appropriate for a given application.

Q: Can I use the S3AB-13-F as a direct replacement for the S3A?

A: The S3AB-13-F is functionally equivalent but uses SMB package instead of SMC. Direct PCB replacement is not possible without layout modification. However, the electrical characteristics are compatible, and the SMB package offers superior thermal performance.

Q: Which substitute part offers the best overall performance?

A: Performance optimization depends on application requirements. The ES3A-13-F offers the lowest forward voltage drop (900 mV @ 3 A) and fast recovery characteristics. The S3A-E3/57T maintains standard recovery characteristics with improved forward voltage (1.15 V @ 2.5 A) and RoHS compliance. Selection should be based on specific circuit requirements for recovery speed, power dissipation, and thermal management.

Q: Are there inventory considerations for part selection?

A: Inventory availability varies significantly. The S3A-E3/57T has the highest inventory (15,100 units), followed by ES3A (17,100 units) and S3AB-13-F (38,200 units). Lower-inventory parts (RS3A-E3/9AT at 669 units, S3A-E3/9AT at 775 units) may have longer lead times for large-volume orders.

Q: What is the operating temperature range difference between parts?

A: Most substitute parts operate from -55°C to 150°C, matching the original S3A. The S3AB-13-F extends the lower temperature limit to -65°C, providing a wider operating range suitable for extreme environment applications.

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