CS3K-E3/H Equivalent & Substitute Parts

Part Overview

The CS3K-E3/H is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while meeting current availability and compliance standards.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A
Reverse Recovery Time (trr)	2.8 µs
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C

Substitute Part Grouping Explanation

Substitution of the CS3K-E3/H is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

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

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within standard rectifier tolerance
Reverse Recovery Time (trr): Faster recovery acceptable
Current - Reverse Leakage @ Vr: Lower leakage acceptable
Capacitance @ Vr, F: Variation acceptable

All identified substitute parts meet the mandatory equivalence parameters. Variations in forward voltage, reverse recovery time, and reverse leakage current represent improved or equivalent performance characteristics and do not preclude substitution.

Parameter Comparison

Parameter	CS3K-E3/H (Vishay)	S3K-E3/57T (Vishay)	S3K (Diotec)	S3K-TP (Micro Commercial Co)	S3K_R1_00001 (Panjit)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Diotec Semiconductor	Micro Commercial Co	Panjit International Inc.
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	1.15 V @ 2.5 A	1.15 V @ 3 A	1.2 V @ 3 A	1.2 V @ 3 A
Reverse Recovery Time (trr)	2.8 µs	2.5 µs	1.5 µs	Not specified	Not specified
Current - Reverse Leakage @ Vr	10 µA @ 800 V	10 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V	1 µA @ 800 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: S3K-E3/57T (Vishay General Semiconductor - Diodes Division)

The S3K-E3/57T is the direct manufacturer equivalent from Vishay, classified as active product status. This part maintains identical electrical ratings and package specifications while offering improved reverse recovery time (2.5 µs versus 2.8 µs) and ROHS3 compliance. Inventory availability is substantial at 10,293 pieces. This substitute is recommended as the first choice for direct replacement in new designs and production continuations.

Secondary Substitute: S3K (Diotec Semiconductor)

The S3K from Diotec Semiconductor meets all mandatory electrical and mechanical parameters with active product status and ROHS3 compliance. This part demonstrates superior reverse recovery time (1.5 µs) and lower reverse leakage current (5 µA). The operating temperature range extends to -50°C minimum, which is acceptable for applications requiring -55°C operation only if thermal margin analysis confirms adequacy. Inventory availability is 3,394 pieces.

Tertiary Substitutes: S3K-TP (Micro Commercial Co) and S3K_R1_00001 (Panjit International Inc.)

Both S3K-TP and S3K_R1_00001 maintain full electrical and mechanical equivalence with active product status and ROHS3 compliance. The S3K_R1_00001 offers superior reverse leakage current performance (1 µA). Both parts are available in tape and reel packaging. Inventory levels are 1,561 and 3,000 pieces respectively.

Selection among substitute parts should prioritize product availability, supply chain reliability, and compliance certifications. All identified substitutes are electrically and mechanically compatible with the CS3K-E3/H.

Frequently Asked Questions (FAQ)

Q: Can the S3K-E3/57T directly replace the CS3K-E3/H without circuit modification?

A: Yes. The S3K-E3/57T maintains identical voltage rating (800 V), current rating (3 A), forward voltage characteristics (1.15 V @ 2.5 A), package type (DO-214AB, SMC), and operating temperature range (-55°C ~ 150°C). No circuit modifications are required.

Q: What is the significance of the different forward voltage specifications between substitutes?

A: Forward voltage variations (1.15 V to 1.2 V) are within standard rectifier diode tolerance and do not require circuit redesign. These differences reflect normal manufacturing variation and improved device characteristics across different manufacturers. Circuit designs rated for 1.2 V operation accommodate lower forward voltage values without functional impact.

Q: Does the Diotec S3K have a lower operating temperature minimum of -50°C versus -55°C?

A: The S3K (Diotec) specifies -50°C minimum junction temperature versus -55°C for other substitutes. Applications requiring operation at -55°C must confirm that the -50°C minimum does not violate system thermal requirements. For most industrial applications operating above -50°C, this difference is not limiting.

Q: Are all substitute parts available in the same packaging options?

A: The S3K-E3/57T is available in Cut Tape (CT) and Digi-Reel packaging. The S3K (Diotec) packaging is not specified. The S3K-TP and S3K_R1_00001 are available in Tape & Reel (TR) format. Packaging selection should align with assembly process requirements and procurement specifications.

Q: What compliance certifications apply to these substitute parts?

A: All active substitute parts (S3K-E3/57T, S3K, S3K-TP, S3K_R1_00001) are ROHS3 compliant. REACH status is unaffected for Vishay and Micro Commercial Co parts. Diotec REACH information is available upon request. All parts carry ECCN EAR99 classification where specified.

Q: Is reverse recovery time improvement from 2.8 µs to 1.5 µs or 2.5 µs significant for circuit performance?

A: Faster reverse recovery time (lower trr values) represents improved switching characteristics and reduced reverse recovery current. This improvement is beneficial in switching applications and does not create compatibility issues. Circuits designed for 2.8 µs recovery time operate correctly with faster-recovery substitutes.

Q: Can reverse leakage current differences affect circuit operation?

A: Reverse leakage current variations (1 µA to 10 µA @ 800 V) are within acceptable rectifier diode specifications. Lower leakage current (as in S3K_R1_00001 at 1 µA) represents improved performance and does not create compatibility concerns. Circuit designs accommodate these variations without modification.

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