RB520S30 Equivalent & Substitute Parts

Part Overview

The RB520S30 is a Schottky rectifier diode manufactured by onsemi, rated for 30 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-523F package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Active alternatives are available from onsemi and Nexperia USA Inc. with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA
Current - Reverse Leakage @ Vr	1 µA @ 10 V
Technology	Schottky
Mounting Type	Surface Mount
Package / Case	SC-79, SOD-523F
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RB520S30 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: SC-79, SOD-523 or SOD-523F

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 600 mV @ 200 mA (primary specification)
Current - Reverse Leakage @ Vr: 1 µA @ 10 V (primary specification)
Operating Temperature - Junction: -55°C minimum, 125°C or higher maximum
RoHS3 Compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (Vf, reverse leakage, temperature range) and SOD-523 packaging. These include RB520S30T1G, RB520S30T5G, NSRLL30XV2T1G, and RB520S30,115 (Nexperia).

Functional Equivalents: Parts meeting voltage, current, and package requirements but with different forward voltage or reverse leakage characteristics. These include RB521S30T1G, RB521S30T5G, NSVRB521S30T1G, BAT54XV2T1G, and BAT54XV2T5G. These parts are suitable for applications where the specified electrical differences do not impact circuit performance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Tj (Max)	Package	Packaging Type
RB520S30	onsemi	Obsolete	30 V	200 mA	600 mV @ 200 mA	1 µA @ 10 V	125°C	SOD-523F	-
RB520S30T1G	onsemi	Active	30 V	200 mA	600 mV @ 200 mA	1 µA @ 10 V	150°C	SOD-523	Cut Tape (CT) & Digi-Reel®
RB520S30T5G	onsemi	Active	30 V	200 mA	600 mV @ 200 mA	1 µA @ 10 V	150°C	SOD-523	Cut Tape (CT) & Digi-Reel®
NSRLL30XV2T1G	onsemi	Active	30 V	200 mA	600 mV @ 200 mA	1 µA @ 10 V	150°C	SOD-523	Tape & Reel (TR)
RB521S30T1G	onsemi	Active	30 V	200 mA	500 mV @ 200 mA	30 µA @ 10 V	125°C	SOD-523	Cut Tape (CT) & Digi-Reel®
RB521S30T5G	onsemi	Active	30 V	200 mA	500 mV @ 200 mA	30 µA @ 10 V	125°C	SOD-523	Cut Tape (CT) & Digi-Reel®
NSVRB521S30T1G	onsemi	Active	30 V	200 mA	500 mV @ 200 mA	30 µA @ 10 V	125°C	SOD-523	Cut Tape (CT) & Digi-Reel®
BAT54XV2T1G	onsemi	Active	30 V	200 mA	800 mV @ 100 mA	2 µA @ 25 V	125°C	SOD-523	Cut Tape (CT) & Digi-Reel®
BAT54XV2T5G	onsemi	Active	30 V	200 mA	800 mV @ 100 mA	2 µA @ 25 V	125°C	SOD-523	Cut Tape (CT) & Digi-Reel®
RB520S30,115	Nexperia USA Inc.	Active	30 V	200 mA	600 mV @ 200 mA	1 µA @ 10 V	150°C	SOD-523	Cut Tape (CT) & Digi-Reel®
1PS79SB10,115	Nexperia USA Inc.	Active	30 V	200 mA	800 mV @ 100 mA	2 µA @ 25 V	125°C	SOD-523	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

RB520S30T1G and RB520S30T5G are the primary active equivalents from onsemi. Both parts maintain identical electrical specifications to the obsolete RB520S30 (600 mV forward voltage at 200 mA, 1 µA reverse leakage at 10 V) while offering extended maximum junction temperature to 150°C. The difference between T1G and T5G variants relates to packaging configuration (Digi-Reel tape width). Both are ROHS3 compliant with MSL 1 rating.

NSRLL30XV2T1G provides equivalent electrical performance with Tape & Reel packaging and 150°C maximum junction temperature. This option is suitable for high-volume automated assembly processes.

RB520S30,115 from Nexperia USA Inc. is an automotive-grade equivalent (AEC-Q100 qualified) with identical electrical specifications and 150°C maximum junction temperature. This part is appropriate for automotive and industrial applications requiring automotive qualification.

Functional Alternatives (Conditional Compatibility):

RB521S30T1G, RB521S30T5G, and NSVRB521S30T1G offer lower forward voltage (500 mV at 200 mA) compared to the RB520S30 specification. These parts are suitable for applications where reduced forward voltage drop improves efficiency or thermal performance. Higher reverse leakage (30 µA at 10 V) must be evaluated against circuit requirements.

BAT54XV2T1G and BAT54XV2T5G feature higher forward voltage (800 mV at 100 mA) and higher reverse leakage (2 µA at 25 V). These parts are suitable for applications where forward voltage characteristics do not constrain circuit operation.

1PS79SB10,115 from Nexperia USA Inc. is an automotive-grade alternative with BAT54 electrical characteristics and AEC-Q100 qualification.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity) rating. Nexperia variants include AEC-Q100 automotive qualification. Selection should account for application-specific compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can RB520S30T1G directly replace the obsolete RB520S30?

A: Yes. RB520S30T1G is a direct electrical equivalent with identical voltage rating (30 V), current rating (200 mA), forward voltage (600 mV @ 200 mA), and reverse leakage (1 µA @ 10 V). The primary difference is packaging format (SOD-523 versus SOD-523F) and extended maximum junction temperature (150°C versus 125°C). Both are surface mount components in the same SC-79 package footprint.

Q: What is the difference between RB520S30T1G and RB520S30T5G?

A: Both parts are electrically identical. The difference is in packaging configuration: T1G uses standard Digi-Reel tape width, while T5G uses an alternative tape width. Selection depends on assembly equipment compatibility and tape reel specifications required by manufacturing processes.

Q: Can I use RB521S30T1G as a substitute for RB520S30?

A: RB521S30T1G meets the voltage (30 V) and current (200 mA) requirements and uses the same SOD-523 package. However, it has lower forward voltage (500 mV @ 200 mA versus 600 mV @ 200 mA) and higher reverse leakage (30 µA @ 10 V versus 1 µA @ 10 V). This substitution is valid only if circuit design tolerates these electrical differences. Lower forward voltage may improve efficiency; higher reverse leakage may affect high-impedance circuit nodes.

Q: What is the difference between onsemi and Nexperia variants?

A: RB520S30,115 from Nexperia USA Inc. is an automotive-grade part with AEC-Q100 qualification. It maintains identical electrical specifications to onsemi RB520S30T1G. Selection between manufacturers depends on application requirements for automotive qualification and supplier availability.

Q: Are BAT54XV2T1G and BAT54XV2T5G suitable replacements?

A: BAT54 variants meet voltage (30 V) and current (200 mA) requirements in SOD-523 packaging. However, forward voltage is higher (800 mV @ 100 mA versus 600 mV @ 200 mA) and reverse leakage is higher (2 µA @ 25 V versus 1 µA @ 10 V). These parts are suitable only for applications where higher forward voltage drop does not degrade circuit performance or thermal characteristics.

Q: What packaging options are available?

A: Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel® for automated pick-and-place assembly, and Tape & Reel (TR) for high-volume production. NSRLL30XV2T1G and 1PS79SB10,115 are supplied in Tape & Reel format. All other active substitutes are available in Cut Tape & Digi-Reel format. Selection depends on assembly process requirements and equipment compatibility.

Q: Does operating temperature range affect substitution?

A: The obsolete RB520S30 specifies -55°C to 125°C junction temperature. Direct equivalents RB520S30T1G, RB520S30T5G, NSRLL30XV2T1G, and RB520S30,115 extend maximum temperature to 150°C, providing improved thermal margin. RB521 and BAT54 variants maintain 125°C maximum. For applications operating near thermal limits, the extended temperature range of direct equivalents provides design margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity level, matching the compliance profile of the obsolete RB520S30.

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