S2K-13 Equivalent & Substitute Parts

Part Overview

The S2K-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 800 V DC reverse voltage and 1.5 A average rectified current in a surface mount SMB (DO-214AA) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the S2K-13 are classified into two categories based on electrical parameter alignment:

Parametric Equivalents maintain identical or equivalent electrical specifications across all critical parameters: reverse voltage (800 V), average rectified current (1.5 A), forward voltage drop, reverse leakage current, and package type (DO-214AA SMB). These parts are direct functional replacements.

Manufacturer Recommended Substitutes share the same reverse voltage rating (800 V) and package configuration (DO-214AA SMB) but may differ in current rating, recovery speed, forward voltage characteristics, or temperature range. Selection of these parts requires verification that the application tolerates the parameter variations.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) (Max): 800 V (required)
Package / Case: DO-214AA, SMB (required)
Mounting Type: Surface Mount (required)
Current - Average Rectified (Io): 1.5 A minimum
Reverse Recovery Speed: Standard or Fast Recovery acceptable

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Speed	Reverse Leakage @ Vr	Package	Status
S2K-13	Diodes Incorporated	800 V	1.5 A	1.15 V @ 1.5 A	Standard Recovery >500ns	5 µA @ 800 V	DO-214AA, SMB	Discontinued
S2K-13-F	Diodes Incorporated	800 V	1.5 A	1.15 V @ 1.5 A	Standard Recovery >500ns	5 µA @ 800 V	DO-214AA, SMB	Active
RS2K R5G	Taiwan Semiconductor Corporation	800 V	2 A	1.3 V @ 2 A	Fast Recovery ≤500ns	5 µA @ 800 V	DO-214AA, SMB	Discontinued
RS2K-E3/52T	Vishay General Semiconductor - Diodes Division	800 V	1.5 A	1.3 V @ 1.5 A	Fast Recovery ≤500ns	5 µA @ 800 V	DO-214AA, SMB	Active
RS2K-E3/5BT	Vishay General Semiconductor - Diodes Division	800 V	1.5 A	1.3 V @ 1.5 A	Fast Recovery ≤500ns	5 µA @ 800 V	DO-214AA, SMB	Active
S2K	Diotec Semiconductor	800 V	2 A	1.15 V @ 2 A	Standard Recovery >500ns	5 µA @ 800 V	DO-214AA, SMB	Active
STTH208U	STMicroelectronics	800 V	2 A	1.65 V @ 2 A	Fast Recovery ≤500ns	5 µA @ 800 V	DO-214AA, SMB	Active

Engineering Selection Recommendations

Primary Recommendation: S2K-13-F

The S2K-13-F is the direct parametric equivalent to the S2K-13. It maintains identical electrical specifications across all critical parameters: 800 V reverse voltage, 1.5 A average rectified current, 1.15 V forward voltage drop at 1.5 A, and standard recovery speed. The S2K-13-F is manufactured by Diodes Incorporated (same manufacturer as the original part), is currently active in production, and carries ROHS3 compliance. This part is the preferred replacement for direct substitution without circuit redesign.

Secondary Recommendations: RS2K-E3/52T and RS2K-E3/5BT

Both Vishay parts (RS2K-E3/52T and RS2K-E3/5BT) maintain the 800 V reverse voltage and 1.5 A current rating, matching the original part's primary electrical specifications. These parts feature fast recovery characteristics (≤500ns) compared to the standard recovery (>500ns) of the S2K-13, resulting in slightly elevated forward voltage (1.3 V @ 1.5 A versus 1.15 V @ 1.5 A). Both parts are active in production and ROHS3 compliant. Selection of these parts is appropriate when fast recovery characteristics provide circuit performance benefits or when supply chain availability favors these alternatives.

Alternative Recommendations: S2K, RS2K R5G, and STTH208U

The S2K (Diotec), RS2K R5G (Taiwan Semiconductor), and STTH208U (STMicroelectronics) are rated for 2 A average rectified current, exceeding the original 1.5 A specification. These parts are suitable for applications where the higher current rating does not create thermal or cost constraints. The S2K and RS2K R5G maintain standard recovery speed characteristics; the STTH208U features fast recovery with the lowest reverse recovery time (75 ns). The S2K is active in production; RS2K R5G is discontinued; STTH208U is active. Forward voltage characteristics vary across these alternatives and must be evaluated against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can S2K-13-F be used as a direct replacement for S2K-13?

A: Yes. The S2K-13-F is a parametric equivalent with identical voltage rating (800 V), current rating (1.5 A), forward voltage (1.15 V @ 1.5 A), recovery speed (standard), and package configuration (DO-214AA SMB). No circuit modifications are required.

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

A: Recovery speed refers to the reverse recovery time (trr), the interval required for a diode to transition from forward conduction to reverse blocking. Standard recovery diodes exhibit trr >500ns; fast recovery diodes exhibit trr ≤500ns. Fast recovery reduces switching losses in high-frequency applications but may increase forward voltage drop.

Q: Can I use a 2 A rated diode (S2K, RS2K R5G, STTH208U) in place of the 1.5 A S2K-13?

A: Yes, from an electrical compatibility standpoint. The higher current rating provides design margin and does not create functional incompatibility. However, thermal dissipation, PCB layout, and cost considerations must be evaluated. The 2 A parts are physically identical in package size (DO-214AA SMB) and mounting configuration.

Q: What is the significance of forward voltage differences between substitute parts?

A: Forward voltage (Vf) affects power dissipation and circuit efficiency. The S2K-13 specifies 1.15 V @ 1.5 A; the Vishay RS2K-E3/52T and RS2K-E3/5BT specify 1.3 V @ 1.5 A; the STTH208U specifies 1.65 V @ 2 A. Higher forward voltage results in increased power loss. Applications sensitive to efficiency or thermal performance must account for these differences.

Q: Are all substitute parts RoHS compliant?

A: The S2K-13 is RoHS non-compliant. All recommended substitute parts (S2K-13-F, RS2K-E3/52T, RS2K-E3/5BT, S2K, RS2K R5G, STTH208U) are ROHS3 compliant, meeting current environmental regulations.

Q: What is the operating temperature range difference between S2K-13 and substitute parts?

A: The S2K-13 operates from -65°C to 150°C. The Vishay parts (RS2K-E3/52T, RS2K-E3/5BT) and Taiwan Semiconductor RS2K R5G operate from -55°C to 150°C, a 10°C reduction in minimum temperature. The Diotec S2K operates from -50°C to 150°C. The STMicroelectronics STTH208U specifies a maximum junction temperature of 175°C. Applications requiring operation below -55°C must retain the original S2K-13 or select S2K-13-F.

Q: Does package type affect PCB layout or assembly?

A: All substitute parts use the DO-214AA (SMB) package, identical to the S2K-13. PCB footprints, solder pad dimensions, and assembly processes remain unchanged. No layout modifications are required.

Q: Which substitute part offers the best availability?

A: Based on provided inventory data, STTH208U (STMicroelectronics) has the highest stock level at 20,300 pieces. S2K-13-F (Diodes Incorporated) has 30,200 pieces available. Both parts are active in production and suitable for long-term supply chain planning.

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