Equivalent & Substitute Parts for RS3A-E3/9AT

Part Overview

The RS3A-E3/9AT 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 3 A average rectified current in a DO-214AB (SMC) package. The part is currently in active product status with fast recovery characteristics (≤500 ns) and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements such as voltage rating adjustments, recovery speed optimization, or manufacturer preference.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 2.5 A	V
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the RS3A-E3/9AT are grouped based on the following substitution criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 50 V
Current - Average Rectified (Io): Equal to or greater than 3 A
Package / Case: DO-214AB or SMC equivalent
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitution Categories:

Category 1: Direct Equivalents (50 V, 3 A, Standard Technology) Parts that match the voltage and current ratings with identical or superior recovery characteristics. These include ES3A, RS3A-13-F, and S3A-13-F.

Category 2: Enhanced Voltage Rating (60 V or Higher, 3 A) Parts that exceed the reverse voltage specification while maintaining 3 A current rating. The STPS3L60S (Schottky technology, 60 V) falls into this category and provides lower forward voltage drop at the cost of higher reverse leakage current.

Category 3: Higher Voltage, Higher Current (200 V, 3 A) The STTH302S provides significantly elevated voltage rating (200 V) with fast recovery characteristics, suitable for applications requiring overvoltage margin or different circuit topologies.

Category 4: Obsolete Status Parts The S3A and S10A-TP are marked as obsolete. S3A maintains 50 V / 3 A specifications but with standard recovery speed (>500 ns). S10A-TP provides 10 A current capacity at 50 V but is obsolete and exhibits standard recovery speed.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Status	Technology
RS3A-E3/9AT	Vishay	50	3	1.3 @ 2.5 A	Fast ≤500 ns	150	10 @ 50 V	DO-214AB (SMC)	Active	Standard
ES3A	Taiwan Semiconductor	50	3	0.95 @ 3 A	Fast ≤500 ns	35	10 @ 50 V	DO-214AB (SMC)	Active	Standard
RS3A-13-F	Diodes Incorporated	50	3	1.3 @ 3 A	Fast ≤500 ns	150	5 @ 50 V	DO-214AB (SMC)	Active	Standard
S3A-13-F	Diodes Incorporated	50	3	1.15 @ 3 A	Standard >500 ns	—	10 @ 50 V	DO-214AB (SMC)	Active	Standard
STPS3L60S	STMicroelectronics	60	3	0.7 @ 3 A	Fast ≤500 ns	—	55 @ 60 V	DO-214AB (SMC)	Active	Schottky
STTH302S	STMicroelectronics	200	3	0.95 @ 3 A	Fast ≤500 ns	35	3 @ 200 V	DO-214AB (SMC)	Active	Standard
S3A	Diodes Incorporated	50	3	1.15 @ 3 A	Standard >500 ns	2000	10 @ 50 V	DO-214AB (SMC)	Obsolete	Standard
S10A-TP	Micro Commercial Co	50	10	1.2 @ 10 A	Standard >500 ns	—	10 @ 50 V	DO-214AB (HSMC)	Obsolete	Standard

Engineering Selection Recommendations

For Direct Replacement (Active Status, Identical Specifications):

ES3A and RS3A-13-F are recommended as primary substitutes. Both maintain 50 V / 3 A ratings with fast recovery characteristics and active product status. ES3A exhibits superior reverse recovery time (35 ns vs. 150 ns) and lower forward voltage (0.95 V vs. 1.3 V), resulting in reduced power dissipation. RS3A-13-F provides identical recovery time and forward voltage characteristics to the main part with lower reverse leakage current (5 µA vs. 10 µA).

For Enhanced Voltage Margin Applications:

STPS3L60S provides 60 V reverse voltage rating with Schottky technology, delivering significantly lower forward voltage drop (0.7 V). This substitution is appropriate when reduced forward conduction losses are prioritized. Note that reverse leakage current increases to 55 µA at 60 V, which may impact standby power consumption in certain circuit topologies.

For High-Voltage Circuit Requirements:

STTH302S operates at 200 V reverse voltage with fast recovery (35 ns) and active product status. This part is suitable for applications requiring substantial overvoltage protection or operation in higher voltage circuit environments while maintaining 3 A current capacity.

For Standard Recovery Speed Applications:

S3A-13-F is an active product offering standard recovery speed (>500 ns) at 50 V / 3 A ratings. This substitution is appropriate for applications where fast recovery is not a circuit requirement and cost optimization is a consideration.

Parts to Avoid:

S3A and S10A-TP are marked as obsolete and should not be selected for new designs. S10A-TP, while offering 10 A capacity, exhibits standard recovery speed and obsolete status, making it unsuitable for modern applications.

All recommended substitutes maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity level, and surface mount DO-214AB (SMC) packaging compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ES3A directly replace the RS3A-E3/9AT in all applications?

A: ES3A is a direct functional equivalent with identical 50 V / 3 A ratings and fast recovery characteristics. The primary differences are superior reverse recovery time (35 ns vs. 150 ns) and lower forward voltage (0.95 V vs. 1.3 V). These differences result in reduced power dissipation and faster switching, making ES3A suitable for all applications where the RS3A-E3/9AT is specified. Both parts use standard rectifier technology and maintain identical operating temperature ranges (-55°C to 150°C).

Q: What is the difference between the RS3A-13-F and S3A-13-F substitutes?

A: Both parts are manufactured by Diodes Incorporated and operate at 50 V / 3 A in DO-214AB (SMC) packages. The key difference is recovery speed: RS3A-13-F exhibits fast recovery (≤500 ns) with 150 ns reverse recovery time, while S3A-13-F exhibits standard recovery (>500 ns). RS3A-13-F is the preferred substitute when fast recovery characteristics are required. S3A-13-F offers lower forward voltage (1.15 V vs. 1.3 V) and is suitable for applications where recovery speed is not a critical parameter.

Q: Why does STPS3L60S have higher reverse leakage current than the main part?

A: STPS3L60S uses Schottky technology rather than standard rectifier technology. Schottky diodes inherently exhibit higher reverse leakage current due to their metal-semiconductor junction structure. At 60 V, the STPS3L60S reverse leakage is 55 µA compared to 10 µA for the RS3A-E3/9AT at 50 V. This characteristic is offset by significantly lower forward voltage drop (0.7 V vs. 1.3 V), making Schottky substitution appropriate for applications prioritizing conduction efficiency over standby leakage performance.

Q: Is the STTH302S suitable as a substitute if my circuit operates at 50 V?

A: Yes. STTH302S is rated for 200 V reverse voltage, which exceeds the 50 V requirement of the RS3A-E3/9AT. The part maintains 3 A current capacity, fast recovery characteristics (35 ns), and active product status. STTH302S is suitable for 50 V operation and provides additional voltage margin for transient overvoltage protection. The higher voltage rating does not degrade performance at lower operating voltages.

Q: Can I use S10A-TP as a substitute if I need higher current capacity?

A: S10A-TP is not recommended for new designs. Although it provides 10 A current capacity at 50 V, it is marked as obsolete product status. Additionally, S10A-TP exhibits standard recovery speed (>500 ns) compared to the fast recovery (≤500 ns) of the RS3A-E3/9AT. For applications requiring higher current capacity with active product status, alternative 10 A rated diodes should be evaluated outside this substitute list.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts listed use DO-214AB (SMC) or equivalent surface mount packaging. The physical footprint is compatible across all recommended substitutes. However, S10A-TP uses DO-214AB (HSMC) variant, which may have slightly different thermal characteristics. Verify PCB layout and thermal management requirements when substituting parts with different current ratings or thermal specifications.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain RoHS3 compliance and REACH Unaffected status, matching the main part specifications. All parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture handling requirements during storage or assembly. ECCN classification is EAR99 for all parts, and HTSUS code 8541.10.0080 applies uniformly across the substitute group.

Q: How do I select between ES3A and RS3A-13-F for my application?

A: Both are active products with 50 V / 3 A ratings and fast recovery characteristics. ES3A offers superior reverse recovery time (35 ns vs. 150 ns) and lower forward voltage (0.95 V vs. 1.3 V), resulting in reduced power dissipation and faster switching response. RS3A-13-F provides lower reverse leakage current (5 µA vs. 10 µA). Select ES3A for applications where switching speed and conduction efficiency are priorities. Select RS3A-13-F for applications where minimizing standby leakage current is important.

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