RS3AB-13 Equivalent & Substitute Parts

Part Overview

The RS3AB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 3 A average rectified current in a Surface Mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within the allowed tolerance range for this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 3 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the RS3AB-13 is determined by strict equivalence in the following critical parameters:

Voltage Rating (Vr): 50 V maximum DC reverse voltage
Current Rating (Io): 3 A average rectified current
Package Type: DO-214AA (SMB) Surface Mount
Mounting Technology: Surface Mount

Parts are classified as equivalent when all electrical parameters (forward voltage, reverse recovery time, reverse leakage current) and mechanical specifications (package, mounting type) match the original part. Parts are classified as substitutes when they meet the voltage and current ratings and package requirements but exhibit acceptable variations in secondary electrical characteristics such as forward voltage drop, recovery speed classification, or reverse leakage current, provided these variations remain within the functional tolerance of the application circuit.

Parameter Comparison

Parameter	RS3AB-13	RS3AB-13-F	S3AB-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	1.15 V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Standard Recovery > 500ns, > 200mA
Reverse Recovery Time (trr)	150 ns	150 ns	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	Not specified
Product Status	Discontinued at DiGi Electronics	Active	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	2160 Pcs	21009 Pcs	1700 Pcs

Engineering Selection Recommendations

RS3AB-13-F (Diodes Incorporated) is the primary equivalent part for the RS3AB-13. This part maintains identical electrical specifications including forward voltage (1.3 V @ 3 A), reverse recovery time (150 ns), and reverse leakage current (5 µA @ 50 V). The RS3AB-13-F is supplied in Tape & Reel packaging format and carries Active product status with ROHS3 compliance, making it suitable for new production designs and ongoing applications. The primary distinction is packaging format (Tape & Reel versus bulk) and RoHS compliance status.

S3AB-TP (Micro Commercial Co) functions as a substitute part meeting the core voltage (50 V) and current (3 A) ratings in the identical DO-214AA SMB package. This part exhibits a lower forward voltage drop (1.15 V @ 3 A) and higher reverse leakage current (10 µA @ 50 V) compared to the original specification. The S3AB-TP is classified as Standard Recovery rather than Fast Recovery, indicating a different speed classification. This part carries ROHS3 compliance but is designated as Not For New Designs, limiting its application to legacy system support or repair scenarios where the parameter variations are acceptable to the circuit design.

Frequently Asked Questions (FAQ)

Q: Can RS3AB-13-F be used as a direct replacement for RS3AB-13?

A: Yes. RS3AB-13-F is an equivalent part with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus bulk) and improved RoHS compliance status. Both parts are rated for 50 V, 3 A, and exhibit identical forward voltage, reverse recovery time, and reverse leakage characteristics.

Q: What are the key differences between RS3AB-13-F and S3AB-TP?

A: Both parts share the same voltage rating (50 V), current rating (3 A), and package type (DO-214AA SMB). RS3AB-13-F is a Fast Recovery diode with 150 ns reverse recovery time and 5 µA reverse leakage current. S3AB-TP is a Standard Recovery diode with higher reverse leakage current (10 µA) and lower forward voltage drop (1.15 V versus 1.3 V). S3AB-TP is designated Not For New Designs.

Q: Is the lower forward voltage of S3AB-TP (1.15 V) an advantage?

A: Lower forward voltage reduces power dissipation in the diode, which can be beneficial in power-sensitive applications. However, S3AB-TP exhibits higher reverse leakage current (10 µA versus 5 µA) and slower recovery characteristics. The suitability of S3AB-TP depends on the specific circuit requirements and thermal constraints.

Q: Why is S3AB-TP marked as Not For New Designs?

A: This designation indicates that the manufacturer has discontinued active development and support for this part. While S3AB-TP remains functionally suitable for applications meeting its electrical specifications, it is not recommended for new product designs due to potential future availability constraints.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and bulk packaging formats contain identical components. The packaging format affects only handling, storage, and assembly processes. Both RS3AB-13 and RS3AB-13-F are electrically equivalent regardless of packaging format.

Q: Are all three parts RoHS compliant?

A: RS3AB-13 is RoHS non-compliant. RS3AB-13-F and S3AB-TP are both ROHS3 compliant. For applications requiring RoHS compliance, RS3AB-13-F or S3AB-TP must be selected.

Q: What is the significance of Fast Recovery versus Standard Recovery classification?

A: Fast Recovery diodes (≤ 500 ns reverse recovery time) are suitable for high-frequency switching applications and provide faster switching transitions. Standard Recovery diodes (> 500 ns) are suitable for lower-frequency rectification applications. The choice depends on the circuit operating frequency and switching requirements.

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