Equivalent & Substitute Parts for S2K General Purpose Rectifier Diode

Part Overview

The onsemi S2K is a general purpose rectifier diode rated for 800 V DC reverse voltage with 2 A average rectified current in a DO-214AA (SMB) surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary to support existing designs, maintain production continuity, and evaluate alternative components for new applications requiring similar electrical and mechanical characteristics.

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)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 800 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2K rectifier diode is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 800 V
Package / Case: Must be DO-214AA (SMB) surface mount
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant

Secondary Compatibility Factors:

Current - Average Rectified (Io): Rated current must meet or exceed application requirements
Voltage - Forward (Vf) (Max): Forward voltage drop characteristics
Reverse Recovery Time (trr): Recovery speed classification (Standard or Fast)
Operating Temperature Range: Junction temperature limits
Product Status: Active status preferred for new procurement

Substitute parts are grouped into two categories based on current rating alignment:

Category A - Direct Current Rating Match (2 A): Parts with 2 A average rectified current provide direct functional equivalence to the S2K.

Category B - Higher Current Rating (1.5 A to 3 A): Parts with current ratings below or above 2 A may be used where circuit design permits, with consideration for thermal and electrical performance differences.

Parameter Comparison

Parameter	S2K (onsemi)	S2K_R1_00001 (Panjit)	STTH208U (STMicroelectronics)	S2K-13-F (Diodes Inc.)	S2K-E3/52T (Vishay)	S3KB (Taiwan Semi.)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	2 A	2 A	2 A	1.5 A	1.5 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	1.1 V @ 2 A	1.65 V @ 2 A	1.15 V @ 1.5 A	1.15 V @ 1.5 A	1.15 V @ 3 A
Speed Classification	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	2 µs	Not specified	75 ns	Not specified	2 µs	1.5 µs
Current - Reverse Leakage @ Vr	1 µA @ 800 V	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	1 µA @ 800 V	10 µA @ 800 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 150 °C	-55 to 150 °C	Max 175 °C	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent - Preferred for Replacement:

The S2K_R1_00001 (Panjit International Inc.) is the primary substitute for the onsemi S2K. This part maintains identical voltage and current ratings (800 V, 2 A), equivalent forward voltage characteristics (1.1 V @ 2 A), and matching package specifications (DO-214AA SMB). The device carries Active product status and ROHS3 compliance, supporting both legacy production and new design qualification. The lower forward voltage (1.1 V versus 1.15 V) provides improved thermal efficiency.

Alternative Equivalent - Active Status:

The STTH208U (STMicroelectronics) provides 800 V, 2 A operation in DO-214AA SMB packaging with Active product status. This device features Fast Recovery characteristics (75 ns trr) compared to the Standard Recovery profile of the S2K. The elevated forward voltage (1.65 V @ 2 A) results in increased power dissipation and requires thermal evaluation in existing designs. This part is suitable for applications where faster switching recovery is beneficial.

Current-Reduced Substitutes - Lower Current Applications:

The S2K-13-F (Diodes Incorporated) and S2K-E3/52T (Vishay) both provide 800 V, 1.5 A operation. These parts are suitable for applications where the circuit current requirement does not exceed 1.5 A. Both maintain Standard Recovery characteristics and ROHS3 compliance. The S2K-13-F offers higher inventory availability (30,200 pcs). The S2K-E3/52T provides reverse recovery time specification (2 µs) matching the original S2K.

Current-Elevated Substitute - Higher Current Applications:

The S3KB (Taiwan Semiconductor Corporation) provides 800 V, 3 A operation in DO-214AA SMB packaging. This part accommodates applications requiring current capacity above 2 A. The device features improved reverse recovery time (1.5 µs) and Active product status. Elevated reverse leakage current (10 µA @ 800 V) and capacitance (40 pF @ 4V) require evaluation in sensitive circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the S2K_R1_00001 be used as a direct replacement for the onsemi S2K?

A: Yes. The S2K_R1_00001 maintains identical voltage (800 V) and current (2 A) ratings, equivalent forward voltage performance, and identical DO-214AA SMB package specifications. The part carries Active product status and ROHS3 compliance, making it suitable for both existing production support and new design qualification.

Q: What is the difference between Standard Recovery and Fast Recovery diodes in these substitutes?

A: The onsemi S2K and most substitutes employ Standard Recovery characteristics (>500 ns reverse recovery time). The STTH208U uses Fast Recovery technology (75 ns trr), enabling faster switching transitions. Fast Recovery diodes generate less switching noise and heat but exhibit higher forward voltage drop. Selection depends on circuit switching frequency and thermal requirements.

Q: Can I use the S2K-13-F or S2K-E3/52T (1.5 A rated) in place of the 2 A S2K?

A: These 1.5 A parts are suitable only if the circuit design operates at or below 1.5 A average rectified current. Using a lower-rated device in a 2 A application results in thermal stress, reduced reliability, and potential device failure. Verify actual circuit current requirements before substitution.

Q: Is the S3KB (3 A rated) a suitable upgrade for the S2K?

A: The S3KB provides higher current capacity and is suitable for applications where circuit current may exceed 2 A. The device maintains 800 V voltage rating and DO-214AA SMB package compatibility. Elevated reverse leakage current (10 µA versus 1 µA) and capacitance (40 pF versus 30 pF) may affect circuit performance in sensitive applications. Electrical simulation or prototype testing is recommended for critical designs.

Q: What is the impact of forward voltage differences between substitutes?

A: Forward voltage variations directly affect power dissipation and thermal performance. The S2K_R1_00001 (1.1 V) dissipates less heat than the original S2K (1.15 V). The STTH208U (1.65 V) generates significantly higher dissipation. In high-current or high-frequency applications, forward voltage differences may require thermal design adjustment. Calculate power dissipation (P = Vf × Io) for each candidate part under actual operating conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, meeting environmental and regulatory requirements equivalent to the original onsemi S2K.

Q: What is the operating temperature range difference between the S2K and substitutes?

A: The onsemi S2K operates from -65°C to 150°C junction temperature. Most substitutes operate from -55°C to 150°C, providing a 10°C reduction in low-temperature capability. The STTH208U specifies a maximum junction temperature of 175°C. For applications requiring operation below -55°C, the original S2K or S2K-13-F are required.

Q: Can I mix different substitute parts in the same circuit board?

A: All substitute parts share identical DO-214AA SMB package footprints and mounting requirements, enabling physical interchangeability on the PCB. However, electrical performance differences (forward voltage, reverse leakage, recovery time) may affect circuit behavior. Consistent part selection across a design is recommended to maintain predictable electrical performance.

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