RS3A R7G Equivalent & Substitute Parts

Part Overview

The RS3A R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within the same application category with minor parameter variations.

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

Substitute Part Grouping Explanation

Substitution of the RS3A R7G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage of 50 V to ensure safe operation within the original circuit design.

Current Rating: The average rectified current of 3 A is the primary functional requirement. Substitute parts with equal or higher current ratings (3 A or greater) are electrically compatible.

Package Type: The DO-214AB (SMC) surface mount package is the mechanical requirement. Substitutes in alternative packages (SMB, SMC variants) require board layout verification but maintain electrical compatibility.

Recovery Characteristics: Fast recovery diodes (≤ 500 ns) are preferred for switching applications. Standard recovery diodes (> 500 ns) represent a functional trade-off with different thermal and EMI characteristics.

Forward Voltage: Forward voltage drop at rated current affects power dissipation. Variations between 0.9 V and 1.3 V at 3 A are within acceptable engineering tolerance for general-purpose rectification.

Temperature Range: Operating junction temperature range of -55°C to 150°C is standard for this component class. Extended ranges (-65°C minimum) provide additional margin.

Compliance: RoHS3 compliance and MSL 1 rating are mandatory for modern manufacturing and storage requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	trr [ns]	Package	Temp Range [°C]	Product Status
RS3A R7G	Taiwan Semiconductor Corporation	50	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	DO-214AB (SMC)	-55 to 150	Discontinued
RS3A	Taiwan Semiconductor Corporation	50	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	DO-214AB (SMC)	-55 to 150	Active
RS3AH	Taiwan Semiconductor Corporation	50	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	DO-214AB (SMC)	-55 to 150	Active
ES3A-13-F	Diodes Incorporated	50	3	0.9 @ 3A	Fast Recovery ≤ 500ns	25	DO-214AB (SMC)	-55 to 150	Active
RS3A-13-F	Diodes Incorporated	50	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	DO-214AB (SMC)	-65 to 150	Active
S3A-13-F	Diodes Incorporated	50	3	1.15 @ 3A	Standard Recovery > 500ns	—	DO-214AB (SMC)	-65 to 150	Active
S3A-E3/57T	Vishay General Semiconductor - Diodes Division	50	3	1.15 @ 2.5A	Standard Recovery > 500ns	2500	DO-214AB (SMC)	-55 to 150	Active
ES3AB-13-F	Diodes Incorporated	50	3	0.9 @ 3A	Fast Recovery ≤ 500ns	25	DO-214AA (SMB)	-55 to 150	Active
RS3AB-13-F	Diodes Incorporated	50	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	DO-214AA (SMB)	-65 to 150	Active
CGRC501-G	Comchip Technology	50	5	1.15 @ 5A	Standard Recovery > 500ns	—	DO-214AB (SMC)	-55 to 150	Active
S10A-TP	Micro Commercial Co	50	10	1.2 @ 10A	Standard Recovery > 500ns	—	DO-214AB (HSMC)	-55 to 150	Obsolete

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement)

RS3A and RS3AH from Taiwan Semiconductor Corporation are parametric equivalents to the discontinued RS3A R7G. Both parts maintain identical electrical specifications including 50 V reverse voltage, 3 A current rating, 1.3 V forward voltage at 3 A, and 150 ns reverse recovery time. RS3A is in active production with 4300 pieces in stock. RS3AH carries AEC-Q101 automotive qualification and is suitable for automotive applications requiring additional reliability assurance. Both parts are RoHS3 compliant with MSL 1 rating.

Fast Recovery Substitutes (DO-214AB SMC Package)

ES3A-13-F from Diodes Incorporated provides superior fast recovery characteristics (25 ns trr) with lower forward voltage (0.9 V @ 3 A), resulting in reduced power dissipation. This part is suitable for high-frequency switching applications. RS3A-13-F from Diodes Incorporated maintains identical electrical performance to the original part with extended temperature range (-65°C to 150°C) and is available in high volume (5545 pieces).

Standard Recovery Substitutes (DO-214AB SMC Package)

S3A-13-F from Diodes Incorporated and S3A-E3/57T from Vishay are standard recovery alternatives with forward voltage of 1.15 V. These parts are appropriate for linear rectification applications where switching speed is not critical. S3A-13-F offers extended temperature range (-65°C to 150°C) with 15200 pieces in stock. S3A-E3/57T provides Vishay manufacturing with 15100 pieces available.

Alternative Package Options

ES3AB-13-F and RS3AB-13-F provide equivalent electrical performance in DO-214AA (SMB) surface mount package. These parts require board layout modification but maintain full electrical compatibility. SMB packages offer different thermal characteristics and board space considerations.

Higher Current Alternatives

CGRC501-G (5 A) and S10A-TP (10 A) provide increased current capacity at 50 V rating. These parts are suitable for applications requiring higher current handling with the same voltage specification. CGRC501-G is active with 5344 pieces in stock. S10A-TP is obsolete and not recommended for new designs.

Compliance and Availability

All recommended active parts maintain RoHS3 compliance and MSL 1 rating. Selection should prioritize active production status parts with adequate inventory levels. Taiwan Semiconductor Corporation RS3A offers the most direct replacement path with highest inventory availability.

Frequently Asked Questions (FAQ)

Q: Can RS3A R7G be directly replaced with RS3A?

A: Yes. RS3A is a parametric equivalent with identical electrical specifications (50 V, 3 A, 1.3 V forward voltage, 150 ns recovery time) and the same DO-214AB (SMC) package. RS3A is in active production with 4300 pieces in stock.

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

A: Fast recovery diodes (≤ 500 ns) switch off more quickly, reducing reverse recovery current and heat generation in high-frequency applications. Standard recovery diodes (> 500 ns) are suitable for linear rectification and lower-frequency switching. The RS3A R7G is a fast recovery type. Standard recovery alternatives like S3A-13-F are appropriate only for applications not requiring fast switching characteristics.

Q: Can I use ES3A-13-F as a direct replacement?

A: ES3A-13-F is electrically compatible with superior fast recovery performance (25 ns vs. 150 ns) and lower forward voltage (0.9 V vs. 1.3 V). The lower forward voltage reduces power dissipation. Both parts use the same DO-214AB (SMC) package. This substitution improves thermal performance in switching applications.

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

A: SMC (DO-214AB) and SMB (DO-214AA) are different surface mount package outlines with different thermal and mechanical characteristics. SMB packages are larger and provide better thermal dissipation. Board layout modification is required when switching between packages. Electrical performance remains identical.

Q: Why is RS3AH qualified for automotive applications?

A: RS3AH carries AEC-Q101 qualification, indicating compliance with automotive reliability standards including thermal cycling, vibration, and moisture resistance testing. This qualification is required for automotive applications but not necessary for general industrial or consumer applications.

Q: Can I use higher current rated diodes like CGRC501-G (5 A) or S10A-TP (10 A)?

A: Yes, higher current rated diodes are electrically compatible and will function correctly in circuits designed for 3 A operation. The higher current rating provides additional safety margin and thermal headroom. However, these parts may have different forward voltage characteristics and recovery times, affecting circuit performance. Verify that switching characteristics are acceptable for the application.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 indicates Moisture Sensitivity Level 1, meaning the component has unlimited shelf life and requires no special moisture control during storage or handling. This simplifies inventory management and reduces component damage risk from moisture absorption.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all recommended active substitute parts listed maintain RoHS3 compliance, ensuring compatibility with modern manufacturing requirements and environmental regulations.

Q: Which substitute offers the best thermal performance?

A: ES3A-13-F provides the lowest forward voltage (0.9 V @ 3 A) compared to the original 1.3 V, resulting in approximately 30% lower power dissipation at rated current. This translates to reduced junction temperature and improved thermal performance in the same package.

Q: What is the minimum operating temperature for these diodes?

A: The RS3A R7G operates from -55°C junction temperature. Some substitutes like RS3A-13-F and S3A-13-F extend this to -65°C, providing additional low-temperature margin for applications in extreme environments.

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