Equivalent & Substitute Parts for RS1AB-13

Part Overview

The RS1AB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMB (DO-214AA) package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the RS1AB-13 are identified based on strict electrical and mechanical parameter matching within the allowed tolerance ranges for this product category. The substitution logic is structured as follows:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 50 V
Current - Average Rectified (Io): Equal to or greater than 1 A
Package / Case: DO-214AA, SMB (identical mechanical footprint)
Mounting Type: Surface Mount (identical assembly compatibility)
Speed Classification: Fast Recovery technology (≤ 500ns, > 200mA)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Reverse Recovery Time (trr): Acceptable for circuit switching performance
Current - Reverse Leakage @ Vr: Within acceptable limits for application
Operating Temperature - Junction: Minimum -55°C to maximum 175°C acceptable

Parts meeting all primary criteria and secondary parameters are classified as direct substitutes. Parts with minor deviations in secondary parameters remain functionally compatible for general-purpose rectification applications.

Parameter Comparison

Parameter	RS1AB-13	RS1AB-13-F	MUR105S
Manufacturer	Diodes Incorporated	Diodes Incorporated	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	875 mV @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	150 ns	150 ns	25 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	50 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 150°C	-65 to 150°C	-55 to 175°C
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RS1AB-13-F (Diodes Incorporated): This part is the direct equivalent to RS1AB-13, manufactured by the same supplier with identical electrical specifications. RS1AB-13-F is supplied in Tape & Reel (TR) packaging format with 15,300 units in stock. The part maintains active product status and achieves ROHS3 compliance, addressing regulatory requirements that the original RS1AB-13 does not meet. Reverse recovery time and forward voltage characteristics are identical to the main part. This substitute is suitable for direct replacement in new designs and production continuity applications.

MUR105S (Taiwan Semiconductor Corporation): This part meets all primary substitution criteria with identical voltage, current, and package specifications. MUR105S demonstrates superior reverse recovery time performance (25 ns versus 150 ns), resulting in lower switching losses and improved efficiency in high-frequency applications. Forward voltage is reduced to 875 mV at 1 A, providing lower conduction losses. Reverse leakage current is elevated to 50 µA at 50 V, which remains acceptable for general-purpose rectification. Operating temperature range extends to 175°C maximum junction temperature. MUR105S is supplied in Tape & Reel (TR) packaging with 6,681 units in stock and achieves ROHS3 compliance. This substitute is suitable for applications requiring enhanced switching performance and extended thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can RS1AB-13-F be used as a direct replacement for RS1AB-13?

A: Yes. RS1AB-13-F is manufactured by Diodes Incorporated with identical electrical specifications: 50 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 150 ns reverse recovery time, and identical operating temperature range. Both parts use the DO-214AA SMB package. The primary difference is packaging format (Tape & Reel for RS1AB-13-F) and compliance status (ROHS3 for RS1AB-13-F). Electrical performance is equivalent.

Q: What are the differences between RS1AB-13-F and MUR105S?

A: Both parts share identical voltage (50 V), current (1 A), and package (DO-214AA SMB) specifications. MUR105S offers faster reverse recovery time (25 ns versus 150 ns), lower forward voltage (875 mV versus 1.3 V at 1 A), and extended maximum junction temperature (175°C versus 150°C). MUR105S exhibits higher reverse leakage current (50 µA versus 5 µA at 50 V). These differences make MUR105S suitable for high-frequency switching applications where reduced switching losses are beneficial.

Q: Are all three parts mechanically compatible in the same PCB footprint?

A: Yes. RS1AB-13, RS1AB-13-F, and MUR105S all use the DO-214AA SMB package with identical mechanical dimensions and pin configuration. All three parts are Surface Mount components suitable for the same PCB layout and assembly process.

Q: Which substitute part should be selected for new designs?

A: RS1AB-13-F is recommended for designs requiring direct electrical equivalence to RS1AB-13 with modern compliance certification. MUR105S is recommended for designs where reduced switching losses and extended thermal performance provide system-level benefits. Both parts are active products with adequate inventory availability.

Q: What is the impact of different reverse recovery times on circuit performance?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectifier applications. MUR105S with 25 ns trr switches faster than RS1AB-13 or RS1AB-13-F with 150 ns trr. Faster switching reduces energy dissipation during the transition period, resulting in lower heat generation and improved efficiency in high-frequency circuits. For low-frequency applications, this difference has minimal impact.

Q: Are there compliance or regulatory differences between these parts?

A: RS1AB-13 is RoHS non-compliant. Both RS1AB-13-F and MUR105S are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, RS1AB-13-F or MUR105S must be selected. Both substitute parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the significance of the different forward voltage specifications?

A: Forward voltage (Vf) determines conduction losses in the diode. RS1AB-13 and RS1AB-13-F specify 1.3 V at 1 A, while MUR105S specifies 875 mV at 1 A. Lower forward voltage reduces power dissipation and heat generation during conduction. In high-current or continuous-duty applications, MUR105S provides improved thermal performance and efficiency.

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