RS3K-M3/9AT Equivalent & Substitute Parts

Part Overview

The RS3K-M3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 800 V DC reverse voltage with a 3 A average rectified current rating and is packaged in the DO-214AB (SMC) form factor. The device is classified as Active product status and complies with ROHS3 standards. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or specific application requirements such as automotive qualification or alternative packaging formats.

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 @ 2.5 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	10 µA @ 800 V	µA
Capacitance @ Vr, F	34	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the RS3K-M3/9AT are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

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

Parametric Equivalent Parts (RS3K-E3/57T, RS3K-E3/9AT, RS3KHE3_A/H) maintain identical electrical specifications including 800 V reverse voltage, 3 A current rating, 1.3 V forward voltage at 2.5 A, 500 ns reverse recovery time, and 34 pF capacitance. These parts differ only in packaging format (Tape & Reel variants) or automotive qualification (AEC-Q101 for RS3KHE3_A/H).

Direct Manufacturer Equivalent (S3K-TP by Micro Commercial Co) provides 800 V / 3 A performance in DO-214AB SMC package with comparable reverse leakage (10 µA @ 800 V). Forward voltage specification differs at 1.2 V @ 3 A versus 1.3 V @ 2.5 A, and recovery speed is classified as Standard Recovery (>500 ns) rather than Fast Recovery (≤500 ns).

Manufacturer Recommended Alternatives (S3K-13-F by Diodes Incorporated and S3M-13-F by Diodes Incorporated) are rated for 800 V and 1000 V respectively, both with 3 A current capacity. S3K-13-F matches the 800 V specification with lower forward voltage (1.15 V @ 3 A) and extended temperature range (-65°C to 150°C). S3M-13-F operates at elevated voltage (1000 V) and is suitable for applications requiring higher voltage margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Temp Range [°C]
RS3K-M3/9AT	Vishay	800	3	1.3 @ 2.5A	500	10 @ 800V	34 @ 4V	DO-214AB	-55 to 150
RS3K-E3/57T	Vishay	800	3	1.3 @ 2.5A	500	10 @ 800V	34 @ 4V	DO-214AB	-55 to 150
RS3K-E3/9AT	Vishay	800	3	1.3 @ 2.5A	500	10 @ 800V	34 @ 4V	DO-214AB	-55 to 150
RS3KHE3_A/H	Vishay	800	3	1.3 @ 2.5A	500	10 @ 800V	34 @ 4V	DO-214AB	-55 to 150
S3K-TP	Micro Commercial Co	800	3	1.2 @ 3A	Standard (>500)	10 @ 800V	Not Specified	DO-214AB	-55 to 150
S3K-13-F	Diodes Incorporated	800	3	1.15 @ 3A	Standard (>500)	10 @ 800V	40 @ 4V	DO-214AB	-65 to 150
S3M-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	Standard (>500)	10 @ 1000V	40 @ 4V	DO-214AB	-65 to 150

Engineering Selection Recommendations

Parametric Equivalents (Vishay RS3K Series): RS3K-E3/57T, RS3K-E3/9AT, and RS3KHE3_A/H are direct parametric equivalents to RS3K-M3/9AT. These parts maintain identical electrical performance and are suitable for direct substitution. RS3KHE3_A/H includes AEC-Q101 automotive qualification and is specified for applications requiring automotive-grade reliability. Selection among these three depends on packaging format requirements and automotive compliance needs.

Micro Commercial Co S3K-TP: This part provides equivalent voltage and current ratings with comparable reverse leakage characteristics. The forward voltage specification (1.2 V @ 3 A) is lower than the main part, and recovery speed is classified as Standard Recovery rather than Fast Recovery. This part is suitable for applications where forward voltage reduction is beneficial and recovery speed requirements do not mandate fast recovery performance.

Diodes Incorporated S3K-13-F: This 800 V / 3 A device offers lower forward voltage (1.15 V @ 3 A) and extended operating temperature range (-65°C to 150°C). The part is ROHS3 compliant and suitable for applications requiring improved thermal performance or lower forward voltage dissipation.

Diodes Incorporated S3M-13-F: This part operates at 1000 V reverse voltage with 3 A current capacity. Selection of this part is appropriate for applications requiring higher voltage margin or where 1000 V rated components are specified. The part maintains 3 A current capacity and is ROHS3 compliant.

All substitute parts are Active product status, ROHS3 compliant, and packaged in DO-214AB (SMC) surface mount format compatible with the original part's mechanical footprint.

Frequently Asked Questions (FAQ)

Q: Can RS3K-E3/57T be used as a direct replacement for RS3K-M3/9AT?

A: Yes. RS3K-E3/57T is a parametric equivalent with identical electrical specifications (800 V, 3 A, 1.3 V forward voltage, 500 ns recovery time) and the same DO-214AB package. The difference is packaging format (Tape & Reel variant). Both parts are manufactured by Vishay and are ROHS3 compliant.

Q: What is the difference between RS3KHE3_A/H and RS3K-M3/9AT?

A: RS3KHE3_A/H maintains identical electrical specifications but includes AEC-Q101 automotive qualification. This part is specified for automotive applications requiring automotive-grade reliability certification. Electrical performance is equivalent.

Q: Can S3K-TP substitute for RS3K-M3/9AT in all applications?

A: S3K-TP provides equivalent 800 V / 3 A performance with comparable reverse leakage. However, forward voltage is specified at 1.2 V @ 3 A (versus 1.3 V @ 2.5 A for the main part), and recovery speed is Standard Recovery (>500 ns) rather than Fast Recovery (≤500 ns). Substitution is appropriate for applications where these differences do not impact circuit performance.

Q: What is the advantage of S3K-13-F over RS3K-M3/9AT?

A: S3K-13-F offers lower forward voltage (1.15 V @ 3 A) and extended operating temperature range (-65°C to 150°C). These characteristics reduce forward voltage dissipation and provide improved thermal margin. Both parts are rated 800 V / 3 A in DO-214AB package.

Q: When should S3M-13-F be selected instead of RS3K-M3/9AT?

A: S3M-13-F is rated for 1000 V reverse voltage versus 800 V for the main part. Selection of S3M-13-F is appropriate for applications requiring higher voltage rating or where 1000 V rated components are specified. Current capacity remains 3 A, and package is DO-214AB.

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

A: Yes. All substitute parts listed are packaged in DO-214AB (SMC) surface mount format, which maintains identical mechanical footprint and land pattern compatibility with RS3K-M3/9AT.

Q: What compliance certifications apply to all listed parts?

A: All parts are ROHS3 compliant and have Moisture Sensitivity Level (MSL) 1 (Unlimited). RS3KHE3_A/H includes AEC-Q101 automotive qualification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

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