S3KB-13 Equivalent & Substitute Parts

Part Overview

The S3KB-13 is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. Manufactured by Diodes Incorporated, this component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the S3KB-13 rectifier diode is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain the 800 V DC reverse voltage specification to ensure safe operation within the intended circuit application.

Current Rating: The average rectified current capacity must meet or exceed 3 A. Parts with lower current ratings represent functional downgrades and are not direct equivalents.

Package Type: All candidates utilize the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB layouts.

Recovery Characteristics: Standard recovery speed (>500ns, >200mA) is the baseline specification. Faster recovery alternatives are acceptable as they represent performance improvements.

Temperature Range: Operating junction temperature range must support the application's thermal environment. Minimum temperature of -55°C or lower and maximum of 150°C or higher are acceptable.

Compliance Status: RoHS3 compliance is preferred for new designs and production continuity, though RoHS non-compliant parts may be used in legacy applications.

Parameter Comparison

Parameter	S3KB-13 (Diodes Inc.)	S3KB-13-F (Diodes Inc.)	S3KB (Taiwan Semi.)	S3KB-TP (Micro Commercial)	STTH208U (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	1.15 V @ 3 A	1.15 V @ 3 A	1.15 V @ 3 A	1.65 V @ 2 A
Speed	Standard >500ns	Standard >500ns	Standard >500ns	Standard >500ns	Fast ≤500ns
Current - Reverse Leakage @ Vr	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	5 µA @ 800 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz	40 pF @ 4V, 1MHz	Not specified	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	Not specified	Max 175°C
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Equivalent: S3KB-13-F (Diodes Incorporated)

The S3KB-13-F is the direct parametric equivalent to the S3KB-13, maintaining identical electrical specifications including 800 V reverse voltage, 3 A average rectified current, 1.15 V forward voltage at 3 A, and 40 pF capacitance. The primary distinction is packaging format (Tape & Reel versus bulk) and compliance status. The S3KB-13-F is ROHS3 compliant and carries active product status, making it the preferred choice for new production and design continuity.

Secondary Equivalent: S3KB (Taiwan Semiconductor Corporation)

The S3KB from Taiwan Semiconductor Corporation provides full parametric equivalence with identical voltage, current, forward voltage, and capacitance specifications. This part is ROHS3 compliant and actively manufactured. The operating temperature range extends to -55°C minimum (versus -65°C for the original), which is acceptable for most industrial applications. Availability is substantial at 75,300 pieces in stock.

Tertiary Equivalent: S3KB-TP (Micro Commercial Co)

The S3KB-TP maintains the critical electrical parameters of 800 V reverse voltage and 3 A average rectified current with identical forward voltage characteristics. ROHS3 compliance is confirmed. This part is suitable for applications where the specific manufacturer is not a design constraint. Capacitance and operating temperature range specifications are not provided in the available data.

Conditional Substitute: STTH208U (STMicroelectronics)

The STTH208U is a functional substitute with the same 800 V reverse voltage rating and DO-214AA package. However, the average rectified current is rated at 2 A, representing a 33% reduction from the 3 A specification of the S3KB-13. This part is suitable only for applications where the circuit design can operate within a 2 A current limit. The STTH208U offers improved performance characteristics including fast recovery (≤500ns) and lower reverse leakage (5 µA), but these advantages do not offset the reduced current capacity for designs requiring the full 3 A rating. ROHS3 compliance and active product status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can the S3KB-13-F be used as a direct replacement for the S3KB-13?

A: Yes. The S3KB-13-F is a parametric equivalent with identical electrical specifications. The primary difference is packaging format (Tape & Reel) and improved RoHS3 compliance status. Both parts are rated for 800 V, 3 A, and operate across -65°C to 150°C.

Q: What is the difference between the S3KB and S3KB-13?

A: The S3KB and S3KB-13 share identical electrical specifications for voltage, current, and forward voltage characteristics. The S3KB is manufactured by Taiwan Semiconductor Corporation while the S3KB-13 is from Diodes Incorporated. Both are suitable for the same applications and are available in active production status.

Q: Why is the STTH208U listed as a substitute if it has a lower current rating?

A: The STTH208U is included as a conditional substitute for applications where circuit design permits operation at 2 A or lower. It is not a direct replacement for designs requiring the full 3 A capacity. The part offers improved recovery characteristics and lower reverse leakage, which may benefit specific circuit topologies despite the reduced current rating.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All substitute parts listed utilize the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: What is the significance of RoHS3 compliance for these parts?

A: RoHS3 compliance indicates conformance to current environmental and hazardous substance restrictions. The S3KB-13-F, S3KB, S3KB-TP, and STTH208U are all ROHS3 compliant, making them suitable for new production and designs subject to regulatory requirements. The original S3KB-13 is non-compliant and should be replaced in new designs.

Q: Can I use the S3KB-TP if capacitance specifications are not provided?

A: The S3KB-TP maintains the critical electrical parameters of voltage, current, and forward voltage. The absence of capacitance data in the available specifications does not indicate non-compliance with the 40 pF specification; it reflects incomplete documentation. For applications where capacitance is a critical design parameter, confirmation with the manufacturer is advised.

Q: What is the minimum operating temperature difference between the S3KB-13 and S3KB?

A: The S3KB-13 operates from -65°C to 150°C, while the S3KB operates from -55°C to 150°C. The 10°C difference in minimum temperature is acceptable for most industrial and commercial applications. Applications requiring operation below -55°C must use the S3KB-13-F or original S3KB-13.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. The S3KB (Taiwan Semiconductor) has the highest inventory at 75,300 pieces, followed by STTH208U at 20,300 pieces, S3KB-13-F at 26,200 pieces, and S3KB-TP at 3,825 pieces. Inventory levels should be considered for long-term production planning and supply chain continuity.

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