S3K M6G Equivalent & Substitute Parts

Part Overview

The S3K M6G 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 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 compatibility within defined parameter tolerances for 800 V, 3 A rectifier applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3K M6G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 800 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB (SMC) or compatible surface mount package
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Allowable Variation Parameters:

Voltage - Forward (Vf): Up to 1.3 V @ rated current (S3K M6G specifies 1.15 V @ 3 A)
Reverse Recovery Time (trr): Standard recovery (>500 ns) or Fast recovery (≤500 ns)
Current - Reverse Leakage: Up to 10 µA @ 800 V (S3K M6G specifies 5 µA)
Capacitance @ Vr: Variation acceptable (30 pF to 60 pF @ 4 V, 1 MHz)

Packaging Considerations:

DO-214AB (SMC) packages are directly interchangeable
DO-214AA (SMB) packages require PCB layout modification but maintain electrical compatibility
Tape & Reel (TR) and Cut Tape (CT) packaging variations do not affect electrical performance

Parts are grouped as Parametric Equivalents when all mandatory parameters match exactly, and as Similar when mandatory parameters match but allowable variations exist in secondary electrical characteristics or package format.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max)	trr	Ir @ Vr	Package	Status
S3K M6G	Taiwan Semiconductor	800 V	3 A	1.15 V @ 3 A	1.5 µs	5 µA @ 800 V	DO-214AB (SMC)	Discontinued
S3K V7G	Taiwan Semiconductor	800 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Discontinued
S3KH	Taiwan Semiconductor	800 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Active
RS3K-13-F	Diodes Incorporated	800 V	3 A	1.3 V @ 3 A	500 ns	5 µA @ 800 V	DO-214AB (SMC)	Active
RS3KB-13-F	Diodes Incorporated	800 V	3 A	1.3 V @ 3 A	500 ns	5 µA @ 800 V	DO-214AA (SMB)	Active
RS3KHE3_A/H	Vishay General Semiconductor	800 V	3 A	1.3 V @ 2.5 A	500 ns	10 µA @ 800 V	DO-214AB (SMC)	Active
RS3KHE3_A/I	Vishay General Semiconductor	800 V	3 A	1.3 V @ 2.5 A	500 ns	10 µA @ 800 V	DO-214AB (SMC)	Active
S3K-13-F	Diodes Incorporated	800 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Active
S3K-TP	Micro Commercial Co	800 V	3 A	1.2 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AB (SMC)	Active
S3KB-13-F	Diodes Incorporated	800 V	3 A	1.15 V @ 3 A	1.5 µs	10 µA @ 800 V	DO-214AA (SMB)	Active
CGRC506-G	Comchip Technology	800 V	5 A	1.15 V @ 5 A	Not specified	10 µA @ 800 V	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

The S3K V7G and S3KH from Taiwan Semiconductor Corporation are parametric equivalents of the S3K M6G. Both maintain 800 V reverse voltage, 3 A average rectified current, 1.15 V forward voltage at 3 A, and 1.5 µs reverse recovery time. The S3KH is the preferred selection as it carries Active product status and includes AEC-Q101 automotive qualification, providing long-term availability and supply chain stability. The S3K V7G, while discontinued at DiGi Electronics, remains available through alternative distribution channels.

Active Substitute Parts (DO-214AB / SMC Package):

For applications requiring active product status with DO-214AB (SMC) packaging, the following parts are suitable:

S3K-13-F (Diodes Incorporated): Maintains standard recovery characteristics and 1.15 V forward voltage matching the original specification. High inventory availability (87,200 pcs) ensures supply continuity.
S3K-TP (Micro Commercial Co): Offers 1.2 V forward voltage with standard recovery performance and active status. Suitable for applications with moderate forward voltage tolerance.
RS3K-13-F (Diodes Incorporated): Features fast recovery (500 ns) and 1.3 V forward voltage. Appropriate for circuits where faster switching is beneficial and forward voltage variation is acceptable.
RS3KHE3_A/H and RS3KHE3_A/I (Vishay General Semiconductor): Both include AEC-Q101 automotive qualification and fast recovery characteristics. Forward voltage specified at 2.5 A rather than 3 A. Suitable for automotive and high-reliability applications.

Alternative Package Consideration (DO-214AA / SMB):

S3KB-13-F (Diodes Incorporated): Electrically equivalent to S3K-13-F but in DO-214AA (SMB) package. Requires PCB layout modification but maintains all electrical parameters.
RS3KB-13-F (Diodes Incorporated): Fast recovery variant in SMB package with 1.3 V forward voltage.

Higher Current Rating (Not Recommended for Direct Substitution):

CGRC506-G (Comchip Technology): Rated for 5 A average rectified current at 800 V. This part exceeds the original 3 A specification and is classified as similar rather than equivalent. Use only when higher current capacity is required by circuit redesign.

Compliance and Certifications:

All listed parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, matching the original S3K M6G specifications. Parts designated with AEC-Q101 qualification (S3KH, RS3KHE3_A/H, RS3KHE3_A/I) are suitable for automotive applications requiring enhanced reliability documentation.

Frequently Asked Questions (FAQ)

Q: Can the S3K M6G be replaced with the S3KH?

A: Yes. The S3KH is a parametric equivalent with identical voltage, current, and recovery time specifications. The S3KH is preferred for new designs due to Active product status and AEC-Q101 automotive qualification, ensuring long-term availability.

Q: What is the difference between standard recovery and fast recovery diodes in this product category?

A: Standard recovery diodes (S3K M6G, S3K-13-F, S3K-TP, S3KB-13-F) have reverse recovery times greater than 500 ns. Fast recovery diodes (RS3K-13-F, RS3KHE3_A/H, RS3KHE3_A/I) have reverse recovery times of 500 ns or less. Fast recovery reduces switching losses in high-frequency applications but may increase reverse leakage current. Selection depends on circuit switching frequency requirements.

Q: Are DO-214AB (SMC) and DO-214AA (SMB) packages interchangeable?

A: Electrically, yes. Both packages maintain identical electrical performance for 800 V, 3 A rectifier applications. However, they have different physical dimensions and PCB footprints. DO-214AA (SMB) is larger than DO-214AB (SMC). Direct substitution requires PCB layout modification. Parts S3KB-13-F and RS3KB-13-F are SMB variants of their SMC counterparts.

Q: What forward voltage variation is acceptable when substituting the S3K M6G?

A: The S3K M6G specifies 1.15 V forward voltage at 3 A. Substitute parts with forward voltages up to 1.3 V are acceptable for most applications. Forward voltage affects power dissipation and heat generation. For thermally sensitive designs, verify that the higher forward voltage does not exceed thermal design limits. Parts specifying forward voltage at 2.5 A (RS3KHE3_A/H, RS3KHE3_A/I) rather than 3 A should be evaluated for the specific load current in the application.

Q: Why is the CGRC506-G listed as similar rather than equivalent?

A: The CGRC506-G is rated for 5 A average rectified current, exceeding the S3K M6G specification of 3 A. While both maintain 800 V reverse voltage and DO-214AB packaging, the higher current rating makes it a similar part suitable only when circuit requirements demand increased current capacity. Direct substitution without circuit analysis is not recommended.

Q: Which substitute part offers the best long-term availability?

A: The S3K-13-F (Diodes Incorporated) offers the highest inventory availability at 87,200 pcs and maintains Active product status. The S3KH (Taiwan Semiconductor) with 3,761 pcs in stock and AEC-Q101 qualification is the preferred equivalent for automotive and high-reliability applications. Both ensure supply chain continuity for ongoing production.

Q: Are all listed parts RoHS3 compliant?

A: Yes. All substitute and equivalent parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original S3K M6G environmental specifications.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts with AEC-Q101 qualification (S3KH, RS3KHE3_A/H, RS3KHE3_A/I) have undergone enhanced reliability testing and are suitable for automotive applications requiring documented quality assurance. Non-qualified parts are suitable for general industrial and consumer applications.

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