CS3K-E3/I Equivalent & Substitute Parts

Part Overview

The CS3K-E3/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V DC reverse voltage with 2 A average rectified current in a DO-214AB surface mount package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max)	1.15 V @ 3 A
Reverse Recovery Time (trr)	2.8 µs
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Package / Case	DO-214AB (SMC)
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CS3K-E3/I is determined by the following critical parameters:

Voltage Rating: The substitute must maintain the 800 V DC reverse voltage specification to ensure circuit protection and reliability in high-voltage applications.

Package Compatibility: The DO-214AB (SMC) surface mount package is mandatory for mechanical and thermal compatibility with existing PCB layouts.

Current Rating: The substitute must support the required current level. The CS3K-E3/I operates at 2 A average rectified current; substitutes with equal or higher current ratings are acceptable.

Temperature Range: Operating temperature range of -55°C to 150°C junction temperature must be maintained.

Compliance Standards: RoHS3 compliance and REACH unaffected status are required for regulatory conformance.

The S3K-E3/9AT meets all substitution criteria, offering identical voltage and package specifications with an upgraded current rating of 3 A, enhanced reverse recovery characteristics, and active product status.

Parameter Comparison

Parameter	CS3K-E3/I (Main Part)	S3K-E3/9AT (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Rectifiers	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	800 V	800 V
Current - Average Rectified (Io)	2 A	3 A
Voltage - Forward (Vf) (Max)	1.15 V @ 3 A	1.15 V @ 2.5 A
Reverse Recovery Time (trr)	2.8 µs	2.5 µs
Current - Reverse Leakage @ Vr	5 µA @ 800 V	10 µA @ 800 V
Package / Case	DO-214AB (SMC)	DO-214AB (SMC)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active

Engineering Selection Recommendations

The S3K-E3/9AT is the direct substitute for the obsolete CS3K-E3/I. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical voltage ratings, package specifications, and temperature operating ranges.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory requirements are met in replacement applications.

Product Status Advantage: The S3K-E3/9AT holds active product status, providing long-term availability and supply chain stability compared to the obsolete CS3K-E3/I.

Performance Enhancement: The substitute offers improved reverse recovery time (2.5 µs versus 2.8 µs) and higher current capacity (3 A versus 2 A), delivering superior performance characteristics within the same package footprint.

Packaging Consideration: The CS3K-E3/I is supplied in Cut Tape (CT) packaging, while the S3K-E3/9AT is supplied in Tape & Reel (TR) format. Both are compatible with standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the S3K-E3/9AT directly replace the CS3K-E3/I in existing designs?

A: Yes. Both components share identical 800 V voltage ratings, DO-214AB package specifications, and -55°C to 150°C operating temperature ranges. The substitute is mechanically and electrically compatible with existing PCB layouts designed for the CS3K-E3/I.

Q: What is the significance of the higher 3 A current rating in the S3K-E3/9AT?

A: The S3K-E3/9AT supports 3 A average rectified current compared to the CS3K-E3/I's 2 A rating. This higher current capacity provides design margin and allows the substitute to operate in applications requiring up to 3 A without derating, while remaining fully compatible with circuits designed for 2 A operation.

Q: Are there compliance differences between the two parts?

A: No. Both the CS3K-E3/I and S3K-E3/9AT maintain ROHS3 compliance and REACH unaffected status. Regulatory requirements are identical for both components.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging supplies individual components on tape segments, suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging supplies components on continuous reels, optimized for automated surface mount assembly processes. Both formats contain the same component in the same package; packaging format selection depends on assembly methodology and volume requirements.

Q: How does the reverse recovery time difference affect circuit performance?

A: The S3K-E3/9AT exhibits a reverse recovery time of 2.5 µs compared to the CS3K-E3/I's 2.8 µs. This faster recovery characteristic reduces switching losses and improves efficiency in high-frequency rectification applications. The improvement is within standard performance variation for this component class and does not introduce compatibility issues.

Q: Is the higher reverse leakage current in the S3K-E3/9AT a concern?

A: The S3K-E3/9AT specifies 10 µA reverse leakage at 800 V compared to the CS3K-E3/I's 5 µA. Both values remain within acceptable limits for general-purpose rectifier applications. The difference reflects normal manufacturing variation across the product line and does not impact circuit functionality in standard rectification circuits.

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