RS3B R7G Equivalent & Substitute Parts

Part Overview

The RS3B R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and design requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with acceptable parameter variations within the same application category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	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 @ 100 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 RS3B R7G is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower at 3 A
Speed Classification: Fast Recovery (≤ 500ns) or Standard Recovery (>500ns)
Reverse Recovery Time (trr): 150 ns or lower
Current - Reverse Leakage @ Vr: 10 µA or lower at 100 V

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: DO-214AB (SMC) or equivalent footprint
Operating Temperature Range: -55°C to 150°C minimum

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped into three categories: parametric equivalents (identical electrical and mechanical specifications with different packaging or product status), direct manufacturers (functionally equivalent from alternative manufacturers), and similar parts (acceptable parameter variations within application tolerance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
RS3B R7G	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	10 @ 100V	DO-214AB (SMC)	-55 to 150	Discontinued at DiGi Electronics
RS3B	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	10 @ 100V	DO-214AB (SMC)	-55 to 150	Active
RS3B V7G	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	10 @ 100V	DO-214AB (SMC)	-55 to 150	Discontinued at DiGi Electronics
RS3BH	Taiwan Semiconductor Corporation	100	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	10 @ 100V	DO-214AB (SMC)	-55 to 150	Active
S3B-TP	Micro Commercial Co	100	3	1.2 @ 3A	Standard Recovery >500ns	—	10 @ 100V	DO-214AB (SMC)	-55 to 150	Not For New Designs
CGRC502-G	Comchip Technology	100	5	1.15 @ 5A	Standard Recovery >500ns	—	10 @ 100V	DO-214AB (SMC)	-55 to 150	Active
ES3B-13-F	Diodes Incorporated	100	3	0.9 @ 3A	Fast Recovery ≤ 500ns	25	10 @ 100V	DO-214AB (SMC)	-55 to 150	Active
ES3BB-13-F	Diodes Incorporated	100	3	0.9 @ 3A	Fast Recovery ≤ 500ns	25	10 @ 100V	DO-214AA (SMB)	-55 to 150	Active
ESH3B-E3/57T	Vishay General Semiconductor - Diodes Division	100	3	0.9 @ 3A	Fast Recovery ≤ 500ns	40	5 @ 100V	DO-214AB (SMC)	-55 to 175	Active
ESH3B-E3/9AT	Vishay General Semiconductor - Diodes Division	100	3	0.9 @ 3A	Fast Recovery ≤ 500ns	40	5 @ 100V	DO-214AB (SMC)	-55 to 175	Active
ESH3B-M3/57T	Vishay General Semiconductor - Diodes Division	100	3	0.9 @ 3A	Fast Recovery ≤ 500ns	40	5 @ 100V	DO-214AB (SMC)	-55 to 175	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

The RS3B (Tape & Reel packaging) from Taiwan Semiconductor Corporation is the primary parametric equivalent with active product status. This part maintains identical electrical specifications and DO-214AB (SMC) package compatibility. The RS3BH variant is also available with active status and includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Fast Recovery Alternatives (Active Status):

The ES3B-13-F from Diodes Incorporated and ESH3B series (ESH3B-E3/57T, ESH3B-E3/9AT, ESH3B-M3/57T) from Vishay General Semiconductor - Diodes Division are active fast recovery alternatives. These parts meet or exceed the electrical requirements with lower forward voltage (0.9 V vs. 1.3 V) and improved reverse recovery characteristics. The Vishay ESH3B variants offer extended operating temperature range (-55°C to 175°C) and lower reverse leakage current (5 µA vs. 10 µA).

Standard Recovery Alternative (Legacy Status):

The S3B-TP from Micro Commercial Co is classified as "Not For New Designs" and features standard recovery characteristics (>500ns). This part is suitable only for legacy system maintenance where fast recovery performance is not required.

Higher Current Alternative:

The CGRC502-G from Comchip Technology provides 5 A rated current with 100 V reverse voltage rating. This part is suitable for applications requiring higher current capacity while maintaining voltage compatibility.

Package Variant:

The ES3BB-13-F from Diodes Incorporated uses DO-214AA (SMB) package instead of DO-214AB (SMC), resulting in different PCB footprint. This part is suitable only when SMB package compatibility is required.

Frequently Asked Questions (FAQ)

Q: Can RS3B R7G be directly replaced with RS3B?

A: Yes. The RS3B is a parametric equivalent with identical electrical specifications (100 V, 3 A, 1.3 V forward voltage, 150 ns reverse recovery time) and DO-214AB (SMC) package compatibility. The primary difference is packaging format (Tape & Reel vs. Cut Tape) and active product status.

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

A: Fast recovery diodes have reverse recovery time ≤ 500ns, while standard recovery diodes exceed 500ns. The RS3B R7G specifies fast recovery (150 ns). Fast recovery diodes are required for high-frequency switching applications. Standard recovery alternatives like S3B-TP are suitable only for lower-frequency applications.

Q: Can ES3B-13-F replace RS3B R7G in all applications?

A: ES3B-13-F is electrically compatible with lower forward voltage (0.9 V vs. 1.3 V) and faster reverse recovery (25 ns vs. 150 ns). These improvements are beneficial in most applications. However, the lower forward voltage may affect circuit behavior in applications with tight voltage regulation requirements. Verification of circuit performance is necessary for critical applications.

Q: Why is RS3BH listed as an alternative if it has the same specifications?

A: RS3BH includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring certified components. Standard RS3B variants lack this qualification. Selection depends on application requirements.

Q: Can CGRC502-G (5 A) be used instead of RS3B R7G (3 A)?

A: CGRC502-G has higher current rating (5 A vs. 3 A) and identical voltage rating (100 V). Higher current rating does not prevent use in 3 A applications. However, CGRC502-G features standard recovery (>500ns) instead of fast recovery (≤ 500ns), making it unsuitable for high-frequency switching applications.

Q: What is the significance of the DO-214AB (SMC) package?

A: DO-214AB (SMC) is a surface mount package with specific PCB footprint dimensions. Parts specified with this package are mechanically and electrically interchangeable on the same PCB layout. ES3BB-13-F uses DO-214AA (SMB) package, which has different footprint and requires PCB redesign.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All parts listed maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), meeting environmental and handling requirements equivalent to the RS3B R7G.

Q: What is the operating temperature difference between RS3B R7G and ESH3B variants?

A: RS3B R7G operates from -55°C to 150°C. ESH3B variants (ESH3B-E3/57T, ESH3B-E3/9AT, ESH3B-M3/57T) extend the upper limit to 175°C. Extended temperature range is beneficial for high-temperature applications but not required for standard -55°C to 150°C operation.

Q: Why is S3B-TP marked "Not For New Designs"?

A: S3B-TP is classified as legacy component. Manufacturers recommend using active alternatives for new designs. S3B-TP is suitable only for replacement in existing systems where design changes are not feasible.

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