S3A-TP Equivalent & Substitute Parts

Part Overview

The S3A-TP 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 SMC (DO-214AB) package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary to support existing applications, facilitate design transitions, and ensure continued component availability for maintenance and production requirements.

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
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AB, SMC	-
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the S3A-TP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 3 A
Mounting Type: Surface Mount
Package / Case: DO-214AB or compatible SMC package
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and MSL 1 rating

Allowable Variation Parameters:

Voltage - Forward (Vf): Substitute parts may have lower forward voltage (improved efficiency) or slightly higher values within acceptable circuit margins
Speed (Recovery Time): Substitute parts may feature faster recovery characteristics (Fast Recovery ≤500ns) without circuit incompatibility
Current - Reverse Leakage: Substitute parts with equal or lower leakage current are acceptable
Capacitance @ Vr: Variation permitted based on application requirements

Substitute parts are grouped into three categories: Direct Equivalents (same manufacturer, same base series), Equivalent Alternatives (different manufacturers, identical electrical specifications), and Upgraded Alternatives (enhanced performance characteristics or different package form factors).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	Speed	Reverse Leakage @ Vr	Package	Product Status
S3A-TP	Micro Commercial Co	50 V	3 A	1.2 V @ 3 A	Standard Recovery >500ns	10 µA @ 50 V	DO-214AB, SMC	Not For New Designs
RS3A-E3/57T	Vishay General Semiconductor	50 V	3 A	1.3 V @ 2.5 A	Fast Recovery ≤500ns	10 µA @ 50 V	DO-214AB, SMC	Active
RS3A-E3/9AT	Vishay General Semiconductor	50 V	3 A	1.3 V @ 2.5 A	Fast Recovery ≤500ns	10 µA @ 50 V	DO-214AB, SMC	Active
S3A-E3/57T	Vishay General Semiconductor	50 V	3 A	1.15 V @ 2.5 A	Standard Recovery >500ns	10 µA @ 50 V	DO-214AB, SMC	Active
S3A-E3/9AT	Vishay General Semiconductor	50 V	3 A	1.15 V @ 2.5 A	Standard Recovery >500ns	10 µA @ 50 V	DO-214AB, SMC	Active
S3AB-13-F	Diodes Incorporated	50 V	3 A	1.15 V @ 3 A	Standard Recovery >500ns	10 µA @ 50 V	DO-214AA, SMB	Active
CSFC301-G	Comchip Technology	50 V	3 A	950 mV @ 3 A	Fast Recovery ≤500ns	5 µA @ 50 V	DO-214AB, SMC	Active
CURC301-G	Comchip Technology	50 V	3 A	1 V @ 3 A	Fast Recovery ≤500ns	5 µA @ 50 V	DO-214AB, SMC	Active
ES3A	Taiwan Semiconductor Corporation	50 V	3 A	950 mV @ 3 A	Fast Recovery ≤500ns	10 µA @ 50 V	DO-214AB, SMC	Active
ES3A-13-F	Diodes Incorporated	50 V	3 A	900 mV @ 3 A	Fast Recovery ≤500ns	10 µA @ 50 V	DO-214AB, SMC	Active
ES3A-E3/57T	Vishay General Semiconductor	50 V	3 A	900 mV @ 3 A	Fast Recovery ≤500ns	10 µA @ 50 V	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Direct Replacement):

The Vishay General Semiconductor parts S3A-E3/57T and S3A-E3/9AT are direct equivalents from the same base product series (S3A). Both are Active status products with identical voltage and current ratings, standard recovery characteristics matching the original S3A-TP, and full RoHS3 compliance. S3A-E3/57T offers 15,100 units in stock; S3A-E3/9AT offers 775 units. These parts are suitable for direct substitution in existing designs without circuit modification.

Equivalent Alternatives (Compatible Substitutes):

Vishay RS3A-E3/57T and RS3A-E3/9AT provide equivalent electrical performance with enhanced fast recovery characteristics (≤500ns). Both maintain 50 V / 3 A ratings, identical reverse leakage, and full compliance certifications. The faster recovery time may improve circuit efficiency in switching applications. RS3A-E3/57T has 1,950 units available; RS3A-E3/9AT has 669 units.

Comchip Technology CSFC301-G and CURC301-G offer superior forward voltage characteristics (950 mV and 1 V respectively at 3 A) with fast recovery performance and reduced reverse leakage (5 µA). Both are Active status with full compliance. CSFC301-G has 1,092 units; CURC301-G has 1,033 units.

Taiwan Semiconductor Corporation ES3A and Diodes Incorporated ES3A-13-F and ES3A-E3/57T provide fast recovery alternatives with improved forward voltage (900–950 mV range). All maintain 50 V / 3 A specifications and full compliance. ES3A offers 17,100 units; ES3A-13-F offers 10,300 units; ES3A-E3/57T offers 5,250 units.

Upgraded Alternative (Package Form Factor Change):

Diodes Incorporated S3AB-13-F is an upgraded alternative using the larger SMB (DO-214AA) package instead of SMC (DO-214AB). It maintains identical 50 V / 3 A electrical specifications with standard recovery characteristics and full compliance. This part is suitable only for applications where PCB layout permits the larger package footprint. 38,200 units are in stock.

All substitute parts listed are RoHS3 compliant, MSL 1 rated, and REACH unaffected, matching the original part's environmental and regulatory status.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different forward voltage (Vf)?

A: Yes. Substitute parts with lower forward voltage (900 mV to 1.15 V range) are acceptable and will improve circuit efficiency. Parts with forward voltage up to 1.3 V are compatible if circuit design margins accommodate the additional voltage drop. Verify that the total forward voltage drop does not exceed the power supply headroom in your specific application.

Q: What is the difference between Standard Recovery and Fast Recovery diodes?

A: Standard Recovery diodes (>500ns reverse recovery time) are suitable for general-purpose rectification and low-frequency switching applications. Fast Recovery diodes (≤500ns) are optimized for higher-frequency switching circuits and reduce switching losses. The S3A-TP uses Standard Recovery; Fast Recovery substitutes (RS3A series, CSFC301-G, CURC301-G, ES3A series) are compatible and may improve performance in switching applications.

Q: Can I substitute the SMC package (DO-214AB) with the SMB package (DO-214AA)?

A: The SMB package (S3AB-13-F) is physically larger than the SMC package. Substitution is possible only if your PCB layout has sufficient space for the larger footprint. The electrical specifications remain identical. Verify PCB pad spacing and component clearances before implementing this substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original S3A-TP specifications. All parts are REACH unaffected and carry EAR99 export classification.

Q: Which substitute part offers the best performance improvement?

A: Performance improvement depends on application requirements. For switching applications, Fast Recovery alternatives (RS3A-E3/57T, CSFC301-G, ES3A-13-F, ES3A-E3/57T) reduce switching losses. For efficiency-critical designs, parts with lower forward voltage (CSFC301-G at 950 mV, ES3A-13-F at 900 mV) minimize conduction losses. For general-purpose rectification, Standard Recovery equivalents (S3A-E3/57T, S3A-E3/9AT) provide direct compatibility.

Q: What is the minimum operating temperature range I should verify?

A: All substitute parts maintain the -55°C to 150°C junction temperature range of the original S3A-TP, except S3AB-13-F which specifies -65°C to 150°C (extended low-temperature range). Verify your application's actual operating temperature requirements against the selected substitute part's datasheet.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, provided all selected parts meet the circuit's voltage, current, and thermal requirements. Mixing parts with different forward voltage characteristics is acceptable if the circuit design accommodates the voltage variation range. Ensure consistent thermal management across all diodes in parallel or series configurations.

Q: Why is the S3A-TP marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory remains available for legacy system support. For new designs, select from the Active status alternatives listed in this reference, such as S3A-E3/57T, RS3A-E3/57T, or ES3A-13-F.

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