RS2KA-13 Equivalent & Substitute Parts

Part Overview

The RS2KA-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 SMA (DO-214AC) package. This component is classified as discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute parts for ongoing production and maintenance applications. The part operates across a junction temperature range of -65°C to 150°C and features fast recovery characteristics with a reverse recovery time of 500 ns.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the RS2KA-13 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 800 V
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Package / Case: Must be DO-214AC or SMA equivalent
Mounting Type: Must be Surface Mount
Speed Classification: Must support Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature Range: Must accommodate the application's thermal requirements
Reverse Recovery Time (trr): Lower values indicate improved switching performance
Forward Voltage (Vf): Affects power dissipation and circuit efficiency
RoHS Compliance: Determines suitability for regulated manufacturing environments

Parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with different packaging or compliance status) and Functional Substitutes (meeting or exceeding all critical parameters with acceptable trade-offs in secondary characteristics).

Parameter Comparison

Parameter	RS2KA-13	RS2KA-13-F	BYG21K-E3/TR	RGF1K	STTH108A	STTH110A
Manufacturer	Diodes Inc.	Diodes Inc.	Vishay	onsemi	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V	1000 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	1.6 V @ 1.5 A	1.3 V @ 1 A	1.65 V @ 1 A	1.7 V @ 1 A
Reverse Recovery Time (trr)	500 ns	500 ns	120 ns	500 ns	75 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 1000 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	—	8.5 pF @ 4V, 1MHz	—	—
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-65 to 150°C	-65 to 150°C	-55 to 150°C	-65 to 175°C	Max 175°C	Max 175°C
Technology	Standard	Standard	Avalanche	Standard	Standard	Standard
Product Status	Discontinued	Active	Active	Not For New Designs	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Recommended Primary Substitute: RS2KA-13-F

The RS2KA-13-F is the direct parametric equivalent of the RS2KA-13, manufactured by Diodes Incorporated. It maintains identical electrical specifications: 800 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage at 1.5 A, and 500 ns reverse recovery time. The primary distinction is product status and compliance: RS2KA-13-F is Active and ROHS3 Compliant, whereas the original RS2KA-13 is Discontinued and RoHS non-compliant. The RS2KA-13-F is supplied in Tape & Reel packaging with 15,420 pieces in stock, providing superior availability and supply chain continuity. This part is the optimal choice for direct replacement in new designs and production restocking.

Alternative Substitute: BYG21K-E3/TR (Vishay)

The BYG21K-E3/TR meets all critical electrical parameters: 800 V reverse voltage and 1.5 A average rectified current in DO-214AC (SMA) package. This part employs Avalanche technology and demonstrates superior reverse recovery performance (120 ns versus 500 ns), resulting in lower switching losses and reduced electromagnetic interference. Forward voltage is 1.6 V at 1.5 A, representing a 0.3 V increase compared to the RS2KA-13. The BYG21K-E3/TR is Active, ROHS3 Compliant, and available in Tape & Reel packaging with 17,150 pieces in stock. This substitute is suitable for applications where improved switching performance justifies the marginal increase in forward voltage dissipation.

Reduced-Current Substitutes: RGF1K, STTH108A, STTH110A

These parts are functional substitutes for applications where the 1.5 A current rating is not fully utilized. All three parts are rated for 1 A average rectified current, which represents a 33% reduction from the RS2KA-13 specification. The RGF1K (onsemi) is marked "Not For New Designs" and is not recommended for new product development. The STTH108A (STMicroelectronics) is Active and ROHS3 Compliant with 75 ns reverse recovery time and 80,200 pieces in stock. The STTH110A (STMicroelectronics) is rated for 1000 V reverse voltage, providing additional voltage margin, with 75 ns reverse recovery time and 60,100 pieces in stock. These parts are suitable only for circuits where the 1.5 A current requirement can be reduced or where the application operates at reduced load conditions.

Frequently Asked Questions (FAQ)

Q: Can RS2KA-13-F be used as a direct replacement for RS2KA-13?

A: Yes. The RS2KA-13-F is a parametric equivalent with identical electrical specifications: 800 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage at 1.5 A, and 500 ns reverse recovery time. The primary differences are product status (Active versus Discontinued) and RoHS compliance (ROHS3 Compliant versus non-compliant). Packaging differs (Tape & Reel versus bulk), but the component itself is electrically and mechanically identical.

Q: What is the difference between the RS2KA-13 and BYG21K-E3/TR?

A: Both parts are rated for 800 V reverse voltage and 1.5 A average rectified current in DO-214AC (SMA) packages. The BYG21K-E3/TR uses Avalanche technology and has a reverse recovery time of 120 ns compared to 500 ns for the RS2KA-13, resulting in faster switching and lower switching losses. The forward voltage is 1.6 V at 1.5 A for the BYG21K-E3/TR versus 1.3 V for the RS2KA-13, representing a 0.3 V increase in forward voltage drop. The BYG21K-E3/TR is suitable for applications where switching speed is critical and the additional forward voltage dissipation is acceptable.

Q: Why are RGF1K, STTH108A, and STTH110A listed as substitutes if they are rated for only 1 A?

A: These parts are functional substitutes for applications where the circuit operates at or below 1 A average rectified current. They maintain the 800 V (or higher for STTH110A) reverse voltage rating and DO-214AC (SMA) package compatibility. These substitutes are appropriate only when the application's actual current requirement does not exceed 1 A. For circuits requiring the full 1.5 A rating, RS2KA-13-F or BYG21K-E3/TR must be used.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates that the diode exhibits fast recovery characteristics with a reverse recovery time of 500 nanoseconds or less when the forward current exceeds 200 mA. This classification ensures the diode switches rapidly from forward conduction to reverse blocking, minimizing switching losses and electromagnetic interference in high-frequency applications.

Q: Are all substitute parts RoHS3 Compliant?

A: All substitute parts listed (RS2KA-13-F, BYG21K-E3/TR, RGF1K, STTH108A, STTH110A) are ROHS3 Compliant. The original RS2KA-13 is RoHS non-compliant. For manufacturing environments subject to RoHS regulations, RS2KA-13-F is the recommended direct replacement.

Q: What is the significance of the operating temperature range differences?

A: The RS2KA-13 operates from -65°C to 150°C junction temperature. The BYG21K-E3/TR operates from -55°C to 150°C, providing a narrower low-temperature range. The RGF1K, STTH108A, and STTH110A operate to 175°C maximum, providing extended high-temperature capability. Selection depends on the application's thermal environment. For applications requiring operation below -55°C, RS2KA-13-F or RGF1K must be used.

Q: Can STTH110A be used in place of RS2KA-13 due to its higher voltage rating?

A: STTH110A is rated for 1000 V reverse voltage, exceeding the 800 V requirement of RS2KA-13. However, STTH110A is rated for only 1 A average rectified current, which is 33% below the 1.5 A requirement. STTH110A is suitable only for applications where the actual current requirement does not exceed 1 A. For circuits requiring 1.5 A at 800 V, STTH110A is not an appropriate substitute.

Q: What packaging options are available for these substitute parts?

A: RS2KA-13-F, BYG21K-E3/TR, and RGF1K are supplied in Tape & Reel (TR) packaging for automated assembly. STTH108A and STTH110A are supplied in Cut Tape (CT) and Digi-Reel® packaging. All parts use the same DO-214AC (SMA) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly equipment.

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