Equivalent & Substitute Parts for S3K-E3/9AT

Part Overview

The S3K-E3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode is rated for 800 V DC reverse voltage with 3 A average rectified current in a DO-214AB (SMC) package. The part is currently active and in stock with 4430 units available. Alternative part numbers are necessary to address packaging format requirements, manufacturer availability, voltage rating upgrades, and supply chain flexibility while maintaining electrical and mechanical compatibility within the application circuit.

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 @ 2.5 A	V
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3K-E3/9AT is determined by the following critical parameters: DC reverse voltage rating (800 V minimum), average rectified current (3 A), package type (DO-214AB/SMC surface mount), forward voltage characteristics, reverse recovery time, and reverse leakage current. Parts are grouped into three categories based on substitution relationship:

Parametric Equivalents maintain identical electrical specifications and package format but differ in packaging configuration (tape & reel versus cut tape) or manufacturer variant designation. These parts are direct functional replacements with no circuit redesign required.

Direct Manufacturer Alternatives are sourced from different manufacturers but meet the same electrical and mechanical requirements. These parts satisfy the core application parameters and are pin-compatible within the same package footprint.

Upgrade Options provide enhanced specifications such as higher voltage ratings or improved recovery characteristics while maintaining backward compatibility with the original circuit application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs]	Ir @ Vr [µA]	Package	Packaging Format	Status
S3K-E3/9AT	Vishay	800	3	1.15 @ 2.5A	2.5	10 @ 800V	DO-214AB	Tape & Reel	Active
S3K-E3/57T	Vishay	800	3	1.15 @ 2.5A	2.5	10 @ 800V	DO-214AB	Cut Tape & Digi-Reel	Active
S3KHE3_A/I	Vishay	800	3	1.15 @ 2.5A	2.5	10 @ 800V	DO-214AB	Tape & Reel	Active (AEC-Q101)
S3K-TP	Micro Commercial Co	800	3	1.2 @ 3A	—	10 @ 800V	DO-214AB	Tape & Reel	Active
STTH310S	STMicroelectronics	1000	3	1.7 @ 3A	0.075	10 @ 1000V	DO-214AB	Cut Tape & Digi-Reel	Active
S3K-13-F	Diodes Incorporated	800	3	1.15 @ 3A	—	10 @ 800V	DO-214AB	Tape & Reel	Active
S3M-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	—	10 @ 1000V	DO-214AB	Cut Tape & Digi-Reel	Active
S3K V7G	Taiwan Semiconductor Corporation	800	3	1.15 @ 3A	1.5	10 @ 800V	DO-214AB	Cut Tape	Discontinued at DiGi Electronics

Engineering Selection Recommendations

For Direct Substitution (No Circuit Modification Required):

Use S3K-E3/57T when cut tape or Digi-Reel packaging is required instead of tape & reel format. This part maintains identical electrical specifications and is sourced from the same manufacturer (Vishay).

Use S3KHE3_A/I when automotive-grade qualification (AEC-Q101) is required. This variant meets the same electrical parameters as the main part and carries automotive certification for applications requiring controlled manufacturing and traceability.

Use S3K-TP (Micro Commercial Co) or S3K-13-F (Diodes Incorporated) as alternative sources for the 800 V, 3 A rectifier function. Both parts maintain the core electrical specifications and DO-214AB package compatibility.

For Voltage Upgrade Applications:

Use STTH310S when a higher reverse voltage rating (1000 V) is required. This part maintains 3 A current rating and DO-214AB package format. Note that forward voltage is higher (1.7 V @ 3 A) and recovery time is faster (75 ns). This part is suitable for circuits requiring enhanced overvoltage margin.

Use S3M-13-F when a 1000 V rated diode with standard recovery characteristics is required. This part provides voltage upgrade capability while maintaining the 3 A current rating and standard recovery speed classification.

Compliance and Certification:

All listed parts are ROHS3 compliant and carry REACH Unaffected status. The S3KHE3_A/I variant includes AEC-Q101 automotive qualification. All parts have MSL rating of 1 (Unlimited moisture sensitivity level).

Avoid:

S3K V7G is discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

S10K is a barrel connector and is not electrically or mechanically compatible with the S3K-E3/9AT rectifier diode application.

Frequently Asked Questions (FAQ)

Q: Can S3K-E3/57T replace S3K-E3/9AT directly in production?

A: Yes. S3K-E3/57T is a parametric equivalent with identical electrical specifications (800 V, 3 A, 1.15 V forward voltage, 2.5 µs recovery time). The only difference is packaging format: S3K-E3/57T is supplied in cut tape and Digi-Reel format instead of tape & reel. No circuit modification is required.

Q: What is the difference between S3KHE3_A/I and S3K-E3/9AT?

A: Electrically and mechanically, both parts are identical (800 V, 3 A, DO-214AB package). S3KHE3_A/I carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring controlled manufacturing processes and traceability. Both are sourced from Vishay.

Q: Can STTH310S be used as a drop-in replacement?

A: STTH310S is mechanically compatible (DO-214AB package, 3 A current rating) but has different electrical characteristics. It provides higher reverse voltage (1000 V versus 800 V), higher forward voltage (1.7 V versus 1.15 V), and faster recovery time (75 ns versus 2.5 µs). It is suitable for circuits requiring higher voltage margin but may affect circuit performance due to increased forward voltage drop.

Q: What is the advantage of S3M-13-F over S3K-13-F?

A: S3M-13-F provides a higher reverse voltage rating (1000 V versus 800 V) while maintaining the same 3 A current rating and DO-214AB package. Both parts are from Diodes Incorporated. S3M-13-F is selected when circuit design requires enhanced overvoltage protection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status and REACH Unaffected designation, meeting current environmental and regulatory requirements.

Q: Why is S10K listed as a substitute?

A: S10K is not a valid substitute. It is a barrel connector (power plug) and is not electrically or mechanically compatible with the S3K-E3/9AT rectifier diode. This part should be disregarded for diode applications.

Q: Can I use S3K V7G for new designs?

A: S3K V7G is discontinued at DiGi Electronics and should not be selected for new production designs. Use S3K-E3/9AT, S3K-E3/57T, S3KHE3_A/I, S3K-TP, or S3K-13-F instead for assured long-term supply.

Q: What packaging formats are available for the 800 V, 3 A rectifier?

A: The S3K-E3/9AT is supplied in tape & reel format. S3K-E3/57T is available in cut tape and Digi-Reel format. S3KHE3_A/I is available in tape & reel with automotive qualification. S3K-TP and S3K-13-F are available in tape & reel format from alternative manufacturers.

Q: Do all parts have the same operating temperature range?

A: Most parts operate from -55°C to 150°C junction temperature. S3K-13-F and S3M-13-F extend the lower temperature limit to -65°C. STTH310S extends the upper temperature limit to 175°C. Verify temperature requirements for your specific application.

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