Equivalent & Substitute Parts for S3K-13

Part Overview

The S3K-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The S3K-13 operates across a junction temperature range of -65°C to 150°C and exhibits standard recovery characteristics with forward voltage of 1.15 V at 3 A. Its discontinuation status requires engineers to evaluate active alternatives that maintain electrical and mechanical compatibility within specified application parameters.

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 @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the S3K-13 is determined by the following critical parameters:

Primary Electrical Requirements:

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

Secondary Electrical Characteristics:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application circuit limits
Speed: Recovery characteristics (Standard or Fast)
Current - Reverse Leakage @ Vr: Leakage current at rated voltage
Operating Temperature - Junction: Must encompass application temperature range

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents Parts that maintain identical or superior electrical ratings (800 V, 3 A) with matching package specifications and active product status. These include S3K-13-F, S3K, and S3K-TP.

Category 2: Functional Alternatives Parts that exceed the primary electrical requirements (higher voltage or current ratings) while maintaining the same package form factor. These include RS3K-E3/57T, RS3K-E3/9AT, STTH310S, and SMLJ60S10-TP. These alternatives are suitable when application headroom or performance enhancement is acceptable.

Non-Equivalent Part: S10 is a barrel connector and is not electrically or functionally equivalent to the S3K-13 rectifier diode. This part appears in the provided substitute list but does not meet the category requirements for diode substitution.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Package	Product Status	RoHS Status
S3K-13	Diodes Incorporated	800	3	1.15 @ 3A	Standard >500ns	DO-214AB, SMC	Discontinued	Non-compliant
S3K-13-F	Diodes Incorporated	800	3	1.15 @ 3A	Standard >500ns	DO-214AB, SMC	Active	ROHS3 Compliant
S3K	Diotec Semiconductor	800	3	1.15 @ 3A	Standard >500ns	DO-214AB, SMC	Active	ROHS3 Compliant
S3K-TP	Micro Commercial Co	800	3	1.2 @ 3A	Standard >500ns	DO-214AB, SMC	Active	ROHS3 Compliant
RS3K-E3/57T	Vishay General Semiconductor	800	3	1.3 @ 2.5A	Fast ≤500ns	DO-214AB, SMC	Active	ROHS3 Compliant
RS3K-E3/9AT	Vishay General Semiconductor	800	3	1.3 @ 2.5A	Fast ≤500ns	DO-214AB, SMC	Active	ROHS3 Compliant
STTH310S	STMicroelectronics	1000	3	1.7 @ 3A	Fast ≤500ns	DO-214AB, SMC	Active	ROHS3 Compliant
SMLJ60S10-TP	Micro Commercial Co	1000	6	1.0 @ 6A	Standard >500ns	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: S3K-13-F

The S3K-13-F is the direct parametric equivalent manufactured by Diodes Incorporated. It maintains identical electrical specifications (800 V, 3 A, 1.15 V forward voltage) and package form factor (DO-214AB, SMC). The part is currently active with 87,200 units in stock. The S3K-13-F achieves ROHS3 compliance, addressing regulatory requirements that the original S3K-13 does not meet. This part is the preferred replacement for direct substitution without circuit redesign.

Secondary Recommendation: S3K (Diotec Semiconductor)

The S3K from Diotec Semiconductor provides identical electrical ratings (800 V, 3 A, 1.15 V forward voltage) and package specifications. This part is active with 3,394 units in stock and carries ROHS3 compliance. The S3K is suitable for applications where multi-source qualification is required or where Diotec supply chain availability is preferred.

Alternative Recommendation: S3K-TP (Micro Commercial Co)

The S3K-TP maintains the 800 V, 3 A electrical specification with a slightly elevated forward voltage of 1.2 V at 3 A. This part is active with 1,561 units in stock and carries ROHS3 compliance. The S3K-TP is suitable for applications where forward voltage tolerance permits the 0.05 V increase.

Higher-Voltage Alternatives: RS3K-E3/57T and RS3K-E3/9AT

Both Vishay parts maintain the 800 V, 3 A core specification but feature fast recovery characteristics (≤500 ns) compared to the standard recovery (>500 ns) of the S3K-13. The RS3K-E3/57T is supplied in Tape & Reel packaging with 10,200 units in stock. The RS3K-E3/9AT is supplied in Cut Tape & Digi-Reel packaging with 10,859 units in stock. Both parts are active and ROHS3 compliant. These alternatives are suitable for applications where faster switching performance is beneficial.

Enhanced-Rating Alternatives: STTH310S and SMLJ60S10-TP

The STTH310S (STMicroelectronics) and SMLJ60S10-TP (Micro Commercial Co) exceed the S3K-13 ratings. STTH310S provides 1000 V, 3 A with fast recovery (75 ns). SMLJ60S10-TP provides 1000 V, 6 A with standard recovery. Both are active and ROHS3 compliant. These parts are suitable for applications requiring higher voltage or current headroom, or where design consolidation across multiple voltage classes is advantageous.

Compliance Consideration:

All recommended substitute parts carry ROHS3 compliance, addressing the non-compliant status of the original S3K-13. This compliance upgrade is mandatory for new designs and recommended for legacy design updates where regulatory requirements apply.

Frequently Asked Questions (FAQ)

Q: Can S3K-13-F be used as a direct replacement for S3K-13 without circuit modification?

A: Yes. The S3K-13-F maintains identical electrical specifications (800 V, 3 A, 1.15 V forward voltage) and package form factor (DO-214AB, SMC). No circuit redesign is required. The primary difference is improved ROHS3 compliance and active product status.

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

A: Both parts maintain 800 V, 3 A ratings and DO-214AB packaging. The S3K-13-F (Diodes Incorporated) specifies 1.15 V forward voltage at 3 A, while S3K-TP (Micro Commercial Co) specifies 1.2 V at 3 A. The 0.05 V difference is acceptable in most applications but should be verified against circuit design margins.

Q: Why are RS3K-E3/57T and RS3K-E3/9AT listed as alternatives if they have different recovery speeds?

A: Both Vishay parts maintain the 800 V, 3 A electrical specification required for the S3K-13 application. The fast recovery characteristic (≤500 ns versus >500 ns) represents an enhancement rather than a limitation. These parts are suitable for applications where faster switching performance is acceptable or beneficial. The difference in packaging (Tape & Reel versus Cut Tape & Digi-Reel) addresses different procurement and assembly requirements.

Q: Can STTH310S or SMLJ60S10-TP be used in place of S3K-13?

A: These parts exceed the S3K-13 electrical specifications. STTH310S provides 1000 V at 3 A (versus 800 V). SMLJ60S10-TP provides 1000 V at 6 A (versus 800 V, 3 A). Both are electrically compatible in circuits designed for 800 V, 3 A operation. However, circuit redesign may be required if the application depends on specific forward voltage or recovery time characteristics. These parts are suitable for applications where higher voltage or current ratings provide design margin or performance enhancement.

Q: What is the significance of the DO-214AB package designation?

A: DO-214AB is the industry standard package designation for surface mount rectifier diodes in the SMC form factor. All recommended substitute parts use this package, ensuring mechanical and thermal compatibility with the original S3K-13 footprint. No PCB redesign is required for package-compatible substitutes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original S3K-13 is non-compliant. This compliance upgrade is mandatory for new designs and recommended for legacy design updates where regulatory requirements apply.

Q: What does "Standard Recovery >500ns" versus "Fast Recovery ≤500ns" mean for circuit operation?

A: Recovery time describes how quickly the diode transitions from conducting to blocking state when reverse voltage is applied. Standard recovery (>500 ns) is suitable for general-purpose rectification and power supply applications. Fast recovery (≤500 ns) reduces switching losses and is beneficial in high-frequency switching applications. For 50/60 Hz line frequency rectification, both recovery speeds are functionally equivalent.

Q: Why is S10 listed in the substitute list if it is not equivalent?

A: S10 is a barrel connector and is not electrically or functionally equivalent to the S3K-13 rectifier diode. This part does not meet substitution criteria and should not be considered for this application. It appears in the provided data but is excluded from engineering recommendations.

Q: What inventory levels should influence part selection?

A: S3K-13-F has the highest inventory (87,200 units), ensuring supply continuity. S3K (3,394 units) and S3K-TP (1,561 units) have lower inventory but remain adequate for most procurement cycles. STTH310S (17,310 units) and SMLJ60S10-TP (12,900 units) provide alternative supply sources. Inventory levels should be evaluated against project lead times and volume requirements.

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