S3K Equivalent & Substitute Parts

Part Overview

The S3K is a general-purpose rectifier diode manufactured by onsemi, rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design flexibility, or performance optimization while maintaining electrical and mechanical compatibility.

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 @ 3	V @ A
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	5	µA @ 800 V
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 S3K are grouped based on 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
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable operating range
Reverse recovery time (trr) and recovery speed classification
Reverse leakage current characteristics
Operating temperature range

Parts are classified into three categories:

Direct Equivalents: Identical voltage and current ratings, same package, active product status
Higher Current Rated: Same voltage, higher current capacity, same package
Higher Voltage Rated: Higher reverse voltage rating, same current, same package

Parts that do not meet the primary substitution criteria (such as S10K, which is a barrel connector, and MURS480ET3G, which has higher current rating and different recovery characteristics) are excluded from direct substitution consideration.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs]	Package	Product Status	Inventory [Pcs]
S3K	onsemi	800	3	1.2 @ 3A	2.5	DO-214AB, SMC	Not For New Designs	3426
S3K-TP	Micro Commercial Co	800	3	1.2 @ 3A	—	DO-214AB, SMC	Active	1561
S3K-13-F	Diodes Incorporated	800	3	1.15 @ 3A	—	DO-214AB, SMC	Active	87200
RS3K-13-F	Diodes Incorporated	800	3	1.3 @ 3A	0.5	DO-214AB, SMC	Active	10179
S3K-E3/57T	Vishay General Semiconductor - Diodes Division	800	3	1.15 @ 2.5A	2.5	DO-214AB, SMC	Active	10293
S3M-13-F	Diodes Incorporated	1000	3	1.15 @ 3A	—	DO-214AB, SMC	Active	15100
RS3M-13-F	Diodes Incorporated	1000	3	1.3 @ 3A	0.5	DO-214AB, SMC	Active	80400
S8KC-13	Diodes Incorporated	800	8	0.985 @ 8A	—	DO-214AB, SMC	Active	122036

Engineering Selection Recommendations

Direct Substitutes (800 V, 3 A, DO-214AB SMC):

The following parts provide direct electrical and mechanical substitution for the S3K:

S3K-13-F (Diodes Incorporated): Active product status with highest inventory availability (87,200 pcs). Meets all primary substitution criteria with forward voltage of 1.15 V @ 3 A, which is lower than the S3K specification of 1.2 V @ 3 A. ROHS3 compliant.
S3K-TP (Micro Commercial Co): Active product status with identical electrical specifications to the S3K. Forward voltage 1.2 V @ 3 A matches the original part. ROHS3 compliant. Tape & Reel packaging.
RS3K-13-F (Diodes Incorporated): Active product status with fast recovery characteristics (trr = 0.5 µs). Forward voltage 1.3 V @ 3 A is slightly elevated compared to S3K. ROHS3 compliant. Highest inventory among fast recovery variants (10,179 pcs).
S3K-E3/57T (Vishay General Semiconductor - Diodes Division): Active product status with reverse recovery time matching the S3K (2.5 µs). Forward voltage 1.15 V @ 2.5 A. ROHS3 compliant.

Higher Voltage Alternatives (1000 V, 3 A, DO-214AB SMC):

These parts provide increased voltage margin while maintaining 3 A current rating:

S3M-13-F (Diodes Incorporated): Active product status rated for 1000 V reverse voltage. Forward voltage 1.15 V @ 3 A. ROHS3 compliant. Suitable for applications requiring higher voltage headroom.
RS3M-13-F (Diodes Incorporated): Active product status rated for 1000 V reverse voltage with fast recovery (trr = 0.5 µs). Forward voltage 1.3 V @ 3 A. ROHS3 compliant. Highest inventory availability among 1000 V variants (80,400 pcs).

Higher Current Alternative (800 V, 8 A, DO-214AB SMC):

S8KC-13 (Diodes Incorporated): Active product status with 8 A current rating at 800 V reverse voltage. Forward voltage 0.985 mV @ 8 A. ROHS3 compliant. Suitable for applications requiring increased current capacity within the same voltage class.

All recommended substitutes maintain ROHS3 compliance, surface mount SMC packaging, and active product status, ensuring long-term supply availability and design continuity.

Frequently Asked Questions (FAQ)

Q: Can S3K-13-F be used as a direct replacement for S3K?

A: Yes. S3K-13-F meets all primary substitution criteria: 800 V reverse voltage, 3 A average rectified current, DO-214AB SMC package, and surface mount configuration. The forward voltage of 1.15 V @ 3 A is lower than the S3K specification of 1.2 V @ 3 A, which is acceptable for most applications. S3K-13-F is an active product with significantly higher inventory availability.

Q: What is the difference between standard recovery and fast recovery variants?

A: Standard recovery diodes have reverse recovery time (trr) greater than 500 ns, while fast recovery diodes have trr of 500 ns or less. The S3K has a trr of 2.5 µs (standard recovery). RS3K-13-F and RS3M-13-F offer fast recovery characteristics (trr = 0.5 µs), which reduces switching losses in high-frequency applications but may not be necessary for all circuit topologies.

Q: Can I use S3M-13-F or RS3M-13-F (1000 V rated) instead of S3K (800 V rated)?

A: Yes. Higher voltage-rated diodes are electrically compatible with lower voltage applications. S3M-13-F and RS3M-13-F provide additional voltage margin and are suitable for circuits designed for 800 V operation. This substitution is conservative from a voltage standpoint and does not compromise circuit performance.

Q: What is the difference between S3K-TP and S3K-13-F packaging?

A: S3K-TP is supplied in Tape & Reel (TR) packaging by Micro Commercial Co, while S3K-13-F is supplied in Cut Tape (CT) & Digi-Reel® packaging by Diodes Incorporated. Both use the same DO-214AB SMC surface mount package. Packaging format affects handling and automated assembly processes but does not affect electrical performance.

Q: Is S8KC-13 suitable as a substitute for S3K?

A: S8KC-13 is electrically compatible with S3K as it maintains the same 800 V reverse voltage rating and DO-214AB SMC package. However, S8KC-13 is rated for 8 A average rectified current, which exceeds the S3K specification of 3 A. This part is suitable only if the application circuit can accommodate the higher current rating without adverse effects. Use S8KC-13 only when increased current capacity is required or beneficial.

Q: Why is MURS480ET3G not recommended as a direct substitute?

A: MURS480ET3G is rated for 4 A average rectified current (versus 3 A for S3K) and exhibits fast recovery characteristics (trr = 100 ns versus 2.5 µs for S3K). While the 800 V reverse voltage and DO-214AB SMC package are compatible, the higher current rating and significantly different recovery speed make it a non-equivalent substitute. MURS480ET3G is suitable only for applications specifically requiring these performance characteristics.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, matching the compliance status of the S3K. All parts are also REACH unaffected and classified under ECCN EAR99.

Q: What inventory considerations should I evaluate?

A: S3K-13-F offers the highest inventory availability (87,200 pcs), followed by RS3M-13-F (80,400 pcs) and S8KC-13 (122,036 pcs). The original S3K has 3,426 pcs in stock. For long-term supply assurance, parts with higher inventory levels and active product status are preferred.

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