S3K Equivalent & Substitute Parts Reference

Part Overview

The S3K is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. The device operates across a junction temperature range of -55°C to 150°C and features standard recovery characteristics with reverse recovery time exceeding 500 ns.

The S3K is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this rectifier specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
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	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the S3K rectifier diode is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Surface Mount
Package / Case: DO-214AB (SMC) or compatible surface mount package
Operating Temperature - Junction: -55°C to 150°C minimum range
Current - Reverse Leakage @ Vr: 10 µA @ 800 V maximum

Secondary Considerations:

Forward voltage (Vf) characteristics within acceptable operating margins
Recovery speed classification (Standard or Fast Recovery acceptable)
RoHS compliance status for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into three categories based on functional equivalence and package configuration:

Direct Equivalents (SMC/DO-214AB Package): Parts maintaining identical package geometry and electrical specifications within tolerance.

Functional Equivalents (Alternative Surface Mount Packages): Parts meeting all electrical requirements but utilizing different surface mount package designations (SMB vs. SMC).

Cross-Manufacturer Alternatives: Parts from different manufacturers meeting the same electrical and thermal specifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If	Speed	Package	Temp Range °C	RoHS Status	Product Status
S3K	Micro Commercial Co	800	3	1.2 V @ 3 A	Standard >500ns	DO-214AB, SMC	-55 to 150	Non-compliant	Obsolete
S3K-TP	Micro Commercial Co	800	3	1.2 V @ 3 A	Standard >500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
RS3K-E3/57T	Vishay General Semiconductor	800	3	1.3 V @ 2.5 A	Fast ≤500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
RS3K-E3/9AT	Vishay General Semiconductor	800	3	1.3 V @ 2.5 A	Fast ≤500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
RS3K-M3/57T	Vishay General Semiconductor	800	3	1.3 V @ 2.5 A	Fast ≤500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
RS3K-M3/9AT	Vishay General Semiconductor	800	3	1.3 V @ 2.5 A	Fast ≤500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
S3K-E3/57T	Vishay General Semiconductor	800	3	1.15 V @ 2.5 A	Standard >500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
S3K-E3/9AT	Vishay General Semiconductor	800	3	1.15 V @ 2.5 A	Standard >500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
S3KB-13-F	Diodes Incorporated	800	3	1.15 V @ 3 A	Standard >500ns	DO-214AA, SMB	-65 to 150	ROHS3 Compliant	Active
CURC306-G	Comchip Technology	800	3	1.7 V @ 3 A	Fast ≤500ns	DO-214AB, SMC	-55 to 150	ROHS3 Compliant	Active
RS3K-13-F	Diodes Incorporated	800	3	1.3 V @ 3 A	Fast ≤500ns	DO-214AB, SMC	-65 to 150	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation: S3K-TP

The S3K-TP from Micro Commercial Co is the direct active equivalent to the obsolete S3K. This part maintains identical electrical specifications, package configuration, and thermal operating range. The S3K-TP is ROHS3 compliant and carries active product status with 1561 units in stock, providing immediate supply availability and design continuity with minimal circuit modification requirements.

Secondary Recommendations: Vishay RS3K and S3K Series

The Vishay General Semiconductor RS3K-E3/57T, RS3K-E3/9AT, RS3K-M3/57T, RS3K-M3/9AT, S3K-E3/57T, and S3K-E3/9AT parts are functionally equivalent alternatives. These devices maintain the 800 V / 3 A electrical specification and DO-214AB package geometry. Vishay parts are ROHS3 compliant with active product status. The RS3K variants feature fast recovery characteristics (≤500 ns), while the S3K variants maintain standard recovery (>500 ns) matching the original S3K specification. Packaging options include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel configurations.

Alternative Package Option: S3KB-13-F

The S3KB-13-F from Diodes Incorporated provides functional equivalence with a different surface mount package (DO-214AA, SMB). This part meets the 800 V / 3 A specification and is ROHS3 compliant. The SMB package is larger than the SMC package and requires PCB layout modification. This option is suitable for applications where package size constraints are not limiting factors.

Cross-Manufacturer Alternative: CURC306-G

The CURC306-G from Comchip Technology meets the 800 V / 3 A electrical specification in the DO-214AB (SMC) package. This part features fast recovery characteristics and is ROHS3 compliant with active product status. Forward voltage is elevated at 1.7 V @ 3 A compared to the original S3K specification of 1.2 V @ 3 A. This characteristic must be evaluated for thermal and efficiency impact in the target application.

Cross-Manufacturer Alternative: RS3K-13-F

The RS3K-13-F from Diodes Incorporated provides functional equivalence with 800 V / 3 A specification in the DO-214AB (SMC) package. This part features fast recovery characteristics and is ROHS3 compliant with active product status. Operating temperature range extends to -65°C, providing enhanced low-temperature performance.

Frequently Asked Questions (FAQ)

Q: Can the S3K-TP directly replace the obsolete S3K without circuit modification?

A: Yes. The S3K-TP maintains identical electrical specifications (800 V, 3 A, 1.2 V forward voltage @ 3 A), thermal operating range (-55°C to 150°C), and package configuration (DO-214AB, SMC). Direct substitution is supported without circuit redesign.

Q: What is the difference between Standard Recovery and Fast Recovery diodes in the substitute list?

A: Recovery speed refers to reverse recovery time (trr). Standard Recovery diodes have trr >500 ns, while Fast Recovery diodes have trr ≤500 ns. The original S3K specifies Standard Recovery >500 ns. Vishay RS3K variants offer Fast Recovery (500 ns), while Vishay S3K variants and S3K-TP maintain Standard Recovery characteristics. Fast Recovery diodes reduce switching losses in high-frequency applications but may introduce different EMI characteristics.

Q: Are all substitute parts RoHS compliant?

A: The original S3K is RoHS non-compliant. All active substitute parts listed (S3K-TP, Vishay RS3K series, Vishay S3K series, S3KB-13-F, CURC306-G, RS3K-13-F) are ROHS3 compliant. RoHS compliance is required for new designs and applications subject to regulatory requirements.

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

A: SMC (DO-214AB) and SMB (DO-214AA) are both surface mount packages but differ in physical dimensions. SMC is smaller than SMB. The S3KB-13-F uses the larger SMB package and requires PCB layout modification compared to the original SMC package. All other substitutes maintain the SMC (DO-214AB) package.

Q: Can I use the CURC306-G as a direct replacement?

A: The CURC306-G meets the 800 V / 3 A electrical specification and uses the same DO-214AB (SMC) package. However, forward voltage is specified at 1.7 V @ 3 A compared to the original S3K at 1.2 V @ 3 A. This 0.5 V difference increases power dissipation and heat generation. Thermal analysis of the target application is required to confirm suitability.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in the following packaging configurations: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and bulk packaging. Tape & Reel packaging is standard for automated assembly processes. Cut Tape & Digi-Reel options provide flexibility for lower-volume production runs.

Q: How do I select between Vishay RS3K and S3K variants?

A: Vishay RS3K variants feature Fast Recovery (≤500 ns), while Vishay S3K variants feature Standard Recovery (>500 ns). Selection depends on application switching frequency and EMI requirements. Standard Recovery variants (S3K-E3/57T, S3K-E3/9AT) provide closer electrical matching to the original S3K specification. Fast Recovery variants (RS3K-E3/57T, RS3K-E3/9AT, RS3K-M3/57T, RS3K-M3/9AT) reduce switching losses in high-frequency rectification circuits.

Q: What is the Moisture Sensitivity Level (MSL) and why is it important?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts carry MSL 1 rating, matching the original S3K specification.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Current inventory levels vary across substitute parts. S3K-E3/57T and S3K-E3/9AT from Vishay maintain the highest inventory (10,293 and 4,430 units respectively). S3K-TP from Micro Commercial Co provides 1,561 units. Inventory levels should be verified at time of procurement to ensure supply continuity for production schedules.

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