Equivalent & Substitute Parts for RS3K R7G

Part Overview

The RS3K R7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 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 design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with variations in specific parameters such as recovery speed, forward voltage, or package configuration.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	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)	500	ns
Current - Reverse Leakage @ Vr	10	µA @ 800 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 RS3K R7G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain 800 V DC reverse voltage (Vr) to ensure circuit protection and reliability.

Current Rating: The 3 A average rectified current (Io) is the primary functional requirement. Parts rated at 5 A (such as CGRC506-G) represent over-specification and are functionally acceptable but not direct equivalents.

Package Configuration: The DO-214AB (SMC) package is the mechanical standard for this application. Substitutes with DO-214AA (SMB) packages (such as RS3KB-13-F and S3KB-13-F) require PCB layout modification and are classified as similar rather than direct equivalents.

Recovery Speed: The RS3K R7G specifies fast recovery (≤ 500 ns). Substitutes with standard recovery (> 500 ns) represent functional alternatives suitable for non-critical switching applications but differ in transient response characteristics.

Forward Voltage: Forward voltage specifications range from 1.15 V to 1.3 V at rated current. Variations within this range do not prevent substitution but affect power dissipation and thermal performance.

Reverse Leakage Current: Specified at 10 µA @ 800 V for the main part. Some substitutes specify 5 µA, representing improved leakage performance.

Compliance and Certification: Automotive-grade parts (AEC-Q101 qualified) represent enhanced reliability variants suitable for demanding applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	Speed	trr	Ir @ Vr	Package	Status
RS3K R7G	Taiwan Semiconductor Corporation	800 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	500 ns	10 µA @ 800 V	DO-214AB (SMC)	Discontinued
RS3KH	Taiwan Semiconductor Corporation	800 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	500 ns	10 µA @ 800 V	DO-214AB (SMC)	Active
S3K-TP	Micro Commercial Co	800 V	3 A	1.2 V @ 3 A	Standard Recovery > 500ns	—	10 µA @ 800 V	DO-214AB (SMC)	Active
CGRC506-G	Comchip Technology	800 V	5 A	1.15 V @ 5 A	Standard Recovery > 500ns	—	10 µA @ 800 V	DO-214AB (SMC)	Active
RS3K-13-F	Diodes Incorporated	800 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	500 ns	5 µA @ 800 V	DO-214AB (SMC)	Active
RS3KB-13-F	Diodes Incorporated	800 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	500 ns	5 µA @ 800 V	DO-214AA (SMB)	Active
S3K-13-F	Diodes Incorporated	800 V	3 A	1.15 V @ 3 A	Standard Recovery > 500ns	—	10 µA @ 800 V	DO-214AB (SMC)	Active
S3KB-13-F	Diodes Incorporated	800 V	3 A	1.15 V @ 3 A	Standard Recovery > 500ns	—	10 µA @ 800 V	DO-214AA (SMB)	Active
S3KHE3_A/H	Vishay General Semiconductor - Diodes Division	800 V	3 A	1.15 V @ 2.5 A	Standard Recovery > 500ns	2.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Active
S3KHE3_A/I	Vishay General Semiconductor - Diodes Division	800 V	3 A	1.15 V @ 2.5 A	Standard Recovery > 500ns	2.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Active
S5KC-13	Diodes Incorporated	800 V	5 A	1.15 V @ 5 A	Standard Recovery > 500ns	—	10 µA @ 800 V	DO-214AB (SMC)	Discontinued

Engineering Selection Recommendations

Direct Equivalent (Parametric Match):

RS3KH from Taiwan Semiconductor Corporation is the parametric equivalent to RS3K R7G. This part maintains identical electrical specifications including 800 V reverse voltage, 3 A current rating, 1.3 V forward voltage at 3 A, fast recovery speed (≤ 500 ns), and 500 ns reverse recovery time. RS3KH is currently active in production with automotive-grade qualification (AEC-Q101) and is available in tape and reel packaging. This part is the primary replacement for discontinued RS3K R7G applications.

Active Substitutes with Identical Package (DO-214AB SMC):

RS3K-13-F (Diodes Incorporated) provides fast recovery characteristics matching the original part with improved reverse leakage current specification (5 µA versus 10 µA). This part is suitable for applications requiring fast switching response and is available in high inventory quantities.

S3K-TP (Micro Commercial Co) and S3K-13-F (Diodes Incorporated) offer standard recovery speed alternatives in the DO-214AB package. These parts are appropriate for non-critical switching applications where recovery speed is not a limiting factor. S3K-13-F maintains higher inventory availability.

S3KHE3_A/H and S3KHE3_A/I (Vishay General Semiconductor - Diodes Division) are automotive-grade alternatives with AEC-Q101 qualification. These parts feature standard recovery speed and are suitable for automotive and industrial applications requiring enhanced reliability certification.

Package Variant Substitutes (DO-214AA SMB):

RS3KB-13-F and S3KB-13-F (Diodes Incorporated) provide equivalent electrical performance in the smaller DO-214AA (SMB) package. These parts require PCB layout modification and are suitable only when space constraints necessitate package downsizing.

Over-Specification Alternatives (5 A Rating):

CGRC506-G (Comchip Technology) and S5KC-13 (Diodes Incorporated) are rated for 5 A current, exceeding the 3 A requirement of the original part. These parts are functionally acceptable for applications where higher current capacity provides design margin but represent over-specification and increased cost.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. Automotive applications should prioritize RS3KH, S3KHE3_A/H, or S3KHE3_A/I due to AEC-Q101 qualification.

Frequently Asked Questions (FAQ)

Q: Can RS3K-13-F directly replace RS3K R7G without PCB modification?

A: Yes. RS3K-13-F maintains identical electrical specifications (800 V, 3 A, 1.3 V forward voltage, fast recovery ≤ 500 ns) and uses the same DO-214AB (SMC) package. No PCB layout changes are required.

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

A: Fast recovery (≤ 500 ns) reduces switching transients and is required for high-frequency switching applications. Standard recovery (> 500 ns) is acceptable for lower-frequency rectification circuits. The RS3K R7G specifies fast recovery; substitutes with standard recovery may introduce additional switching losses in high-frequency applications.

Q: Can I use a 5 A rated diode (CGRC506-G or S5KC-13) in place of the 3 A RS3K R7G?

A: Yes, from an electrical standpoint. The 5 A rating provides design margin and is functionally compatible. However, this represents over-specification and may increase component cost and thermal performance unnecessarily. Use only if design requirements specifically call for higher current capacity.

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

A: These are different physical packages with different PCB footprints. DO-214AB (SMC) is larger than DO-214AA (SMB). Parts such as RS3KB-13-F and S3KB-13-F in the SMB package require PCB redesign and are not direct mechanical substitutes. Use only when space constraints necessitate package downsizing.

Q: Are automotive-grade parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive and safety-critical applications. RS3KH, S3KHE3_A/H, and S3KHE3_A/I carry this certification. For general industrial or consumer applications, non-automotive parts such as S3K-13-F or RS3K-13-F are acceptable.

Q: What is the difference between reverse leakage current specifications of 5 µA and 10 µA?

A: Lower reverse leakage current (5 µA) indicates improved diode quality and reduced standby power dissipation. Parts such as RS3K-13-F with 5 µA leakage are preferred for low-power or battery-powered applications. For standard applications, the 10 µA specification is acceptable.

Q: Why is RS3K R7G discontinued if equivalent parts are available?

A: Component discontinuation follows manufacturer production decisions and market consolidation. Equivalent parts from other manufacturers (such as RS3KH from Taiwan Semiconductor Corporation or RS3K-13-F from Diodes Incorporated) provide identical functionality and are actively produced, ensuring design continuity.

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

A: Yes. All recommended substitutes maintain identical electrical specifications and package standards. Mixing manufacturers is acceptable from an electrical standpoint. Ensure procurement and quality control processes accommodate multiple suppliers if required.

Q: What inventory status should I prioritize when selecting a substitute?

A: Active production status ensures long-term availability and supply chain stability. S3K-13-F (87,200 pcs), S3KB-13-F (26,200 pcs), and RS3KB-13-F (15,200 pcs) offer the highest inventory availability. Discontinued parts such as S5KC-13 should be avoided for new designs unless existing stock is confirmed.

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