S2K Equivalent & Substitute Parts Reference

Part Overview

The S2K is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status with standard recovery characteristics and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility across multiple suppliers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 2 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 800 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the S2K are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (Full Substitution): Parts that match all critical electrical parameters including reverse voltage (800 V), average rectified current (2 A), forward voltage drop, recovery characteristics, and package form factor (DO-214AA SMB). These parts are direct replacements with no circuit redesign required.

Similar Parts (Conditional Substitution): Parts that maintain the 800 V reverse voltage rating and SMB package family but differ in one or more of the following parameters: average rectified current (1.5 A or 3 A), forward voltage characteristics, reverse recovery time, or reverse leakage current. These parts require design verification to confirm circuit compatibility.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal 800 V
Package / Case: Must be DO-214AA (SMB) or compatible SMB variant
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant
Current - Average Rectified (Io): Preferred match at 2 A; 1.5 A acceptable if circuit permits; 3 A acceptable with thermal verification
Voltage - Forward (Vf): Acceptable range 1.15 V to 1.65 V @ rated current
Operating Temperature Range: Must support -55°C minimum junction temperature

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [µs]	Ir @ Vr [µA]	Package	Grade	Temp Range [°C]
S2K	Taiwan Semiconductor Corporation	800	2	1.15 @ 2 A	1.5	1 @ 800 V	DO-214AA (SMB)	Standard	-55 to 150
S2KH	Taiwan Semiconductor Corporation	800	2	1.15 @ 2 A	1.5	1 @ 800 V	DO-214AA (SMB)	Automotive (AEC-Q101)	-55 to 150
S2KHE3_A/H	Vishay General Semiconductor - Diodes Division	800	1.5	1.15 @ 1.5 A	2	1 @ 800 V	DO-214AA (SMB)	Automotive (AEC-Q101)	-55 to 150
S2K-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5 A	—	5 @ 800 V	DO-214AA (SMB)	Standard	-65 to 150
S2KA-13-F	Diodes Incorporated	800	1.5	1.15 @ 1.5 A	—	5 @ 800 V	DO-214AC (SMA)	Standard	-65 to 150
RS2K-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5 A	0.5	5 @ 800 V	DO-214AA (SMB)	Standard	-65 to 150
RS2KA-13-F	Diodes Incorporated	800	1.5	1.3 @ 1.5 A	0.5	5 @ 800 V	DO-214AC (SMA)	Standard	-65 to 150
S3KB	Taiwan Semiconductor Corporation	800	3	1.15 @ 3 A	1.5	10 @ 800 V	DO-214AA (SMB)	Standard	-55 to 150
S3KB-TP	Micro Commercial Co	800	3	1.15 @ 3 A	—	10 @ 800 V	DO-214AA (SMB)	Standard	—
STTH208U	STMicroelectronics	800	2	1.65 @ 2 A	0.075	5 @ 800 V	DO-214AA (SMB)	Standard	—

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

The S2KH from Taiwan Semiconductor Corporation is a parametric equivalent to the S2K with identical electrical specifications. The S2KH carries Automotive grade qualification (AEC-Q101) and is suitable for applications requiring automotive-level reliability. Both parts maintain 800 V reverse voltage, 2 A average rectified current, and identical forward voltage characteristics. The S2KH is the preferred substitute when automotive qualification is required or when standard-grade inventory is unavailable.

Conditional Substitution (1.5 A Rated Current):

Parts rated for 1.5 A average rectified current (S2KHE3_A/H, S2K-13-F, S2KA-13-F, RS2K-13-F, RS2KA-13-F) are suitable substitutes only when circuit analysis confirms that the application does not require the full 2 A capability. These parts maintain the 800 V reverse voltage rating and are available from multiple manufacturers. The S2KHE3_A/H from Vishay carries AEC-Q101 automotive qualification. Parts from Diodes Incorporated (S2K-13-F, S2KA-13-F, RS2K-13-F, RS2KA-13-F) offer extended temperature range to -65°C. Package variants include DO-214AA (SMB) and DO-214AC (SMA) options.

Conditional Substitution (3 A Rated Current):

The S3KB and S3KB-TP are rated for 3 A average rectified current and are suitable when the application requires higher current capacity than the 2 A S2K rating. Both parts maintain 800 V reverse voltage and DO-214AA (SMB) package compatibility. Thermal design verification is required to confirm that the increased current rating does not exceed junction temperature limits in the target application.

Fast Recovery Alternative:

The STTH208U from STMicroelectronics is rated for 2 A at 800 V with fast recovery characteristics (75 ns reverse recovery time). This part is suitable when fast switching performance is required. The forward voltage drop is higher at 1.65 V compared to the S2K at 1.15 V, which affects power dissipation and thermal design.

Compliance and Certification:

All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the S2K environmental compliance profile. Automotive-qualified variants (S2KH, S2KHE3_A/H) carry AEC-Q101 certification for applications requiring automotive-grade component qualification.

Frequently Asked Questions (FAQ)

Q: Can the S2KH be used as a direct replacement for the S2K?

A: Yes. The S2KH is a parametric equivalent with identical electrical specifications: 800 V reverse voltage, 2 A average rectified current, 1.15 V forward voltage drop, and 1.5 µs reverse recovery time. The primary difference is automotive-grade qualification (AEC-Q101). Both parts use the DO-214AA (SMB) package and operate across -55°C to 150°C junction temperature range.

Q: Can I substitute a 1.5 A rated diode for the 2 A S2K?

A: Substitution is possible only if circuit analysis confirms that the application does not require the full 2 A capability. Parts such as S2KHE3_A/H, S2K-13-F, and RS2K-13-F are rated for 1.5 A and maintain the 800 V reverse voltage. Verify that peak and average current demands in the target circuit do not exceed 1.5 A before implementing this substitution.

Q: What is the difference between S2K-13-F and RS2K-13-F?

A: Both parts are rated for 800 V and 1.5 A from Diodes Incorporated. The RS2K-13-F features fast recovery characteristics with 500 ns reverse recovery time and 1.3 V forward voltage drop, compared to the S2K-13-F with standard recovery (>500 ns) and 1.15 V forward voltage drop. Fast recovery reduces switching losses but increases forward voltage dissipation.

Q: Can I use the S3KB (3 A rated) instead of the S2K (2 A rated)?

A: Yes, the S3KB is electrically compatible with 800 V reverse voltage and DO-214AA (SMB) package. However, thermal design verification is required. The higher current rating increases junction temperature rise under load. Confirm that thermal management in the target application can accommodate the increased power dissipation before implementation.

Q: What is the difference between SMB and SMA packages?

A: SMB refers to DO-214AA package and SMA refers to DO-214AC package. Both are surface mount packages with different physical dimensions. Parts designated with "A" suffix (S2KA-13-F, RS2KA-13-F, S2KHE3_A/H) use the SMA (DO-214AC) package. Verify PCB footprint compatibility before substituting between SMB and SMA variants.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the S2K.

Q: Which substitute part offers the fastest recovery time?

A: The STTH208U from STMicroelectronics offers the fastest recovery time at 75 ns. This part is suitable for applications requiring fast switching performance. Note that forward voltage drop is higher at 1.65 V compared to the S2K at 1.15 V, affecting thermal design.

Q: Can I use an automotive-qualified part (S2KH or S2KHE3_A/H) in a non-automotive application?

A: Yes. Automotive-qualified parts exceed standard reliability requirements and are suitable for any application. The S2KH provides identical electrical performance to the S2K with additional AEC-Q101 qualification. The S2KHE3_A/H is rated for 1.5 A and requires current capacity verification.

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