RB521S-30LP-TP Equivalent & Substitute Parts

Part Overview

The RB521S-30LP-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 30V DC reverse voltage and 100mA average rectified current in a SOD-882 surface mount package. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	100mA
Voltage - Forward (Vf) (Max) @ If	350 mV @ 10 mA
Current - Reverse Leakage @ Vr	10 µA @ 10 V
Technology	Schottky
Mounting Type	Surface Mount
Package / Case	SOD-882
Operating Temperature - Junction (Max)	125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RB521S-30LP-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 30V
Current - Average Rectified (Io): Must equal or exceed 100mA
Technology: Schottky diode type
Mounting Type: Surface Mount
Package / Case: SOD-882 or equivalent footprint

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Forward voltage characteristics must be compatible with circuit design
Current - Reverse Leakage @ Vr: Leakage current specifications must not exceed circuit requirements
Operating Temperature - Junction: Maximum junction temperature must support application thermal environment
RoHS and MSL Compliance: Environmental and regulatory compliance must be maintained

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with identical electrical performance) and Compatible Alternatives (meeting or exceeding primary criteria with enhanced or modified electrical characteristics suitable for the same application class).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Temp (Max)	Status
RB521S-30LP-TP	Micro Commercial Co	30 V	100mA	350 mV @ 10 mA	10 µA @ 10 V	SOD-882	125°C	Obsolete
RB521S-30L2-TP	Micro Commercial Co	30 V	100mA	350 mV @ 10 mA	10 µA @ 10 V	SOD-882	125°C	Active
RB521CS30L,315	Nexperia USA Inc.	30 V	100mA	350 mV @ 10 mA	10 µA @ 10 V	SOD-882	150°C	Active
BAT54L,315	NXP Semiconductors	30 V	200mA	800 mV @ 100 mA	2 µA @ 25 V	SOD-882	150°C	Active
PMEG3002AEL,315	Nexperia USA Inc.	30 V	200mA	480 mV @ 200 mA	50 µA @ 30 V	SOD-882	150°C	Active
PMEG3005EL,315	Nexperia USA Inc.	30 V	500mA	500 mV @ 500 mA	500 µA @ 30 V	SOD-882	150°C	Active
BAS3010S02LRHE6327XTSA1	Infineon Technologies	30 V	1A	650 mV @ 1 A	300 µA @ 30 V	SOD-882	150°C	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

RB521S-30L2-TP is the direct equivalent to RB521S-30LP-TP. Both parts are manufactured by Micro Commercial Co, share identical electrical specifications (30V, 100mA, 350mV forward voltage), and maintain the same SOD-882 package footprint. RB521S-30L2-TP holds active product status with substantial inventory availability (544,510 units), ensuring supply chain continuity. This part is the preferred substitution path for direct replacement applications.

Automotive-Qualified Alternative:

RB521CS30L,315 manufactured by Nexperia USA Inc. provides an automotive-grade equivalent with AEC-Q100 qualification. Electrical parameters match the original part exactly (30V, 100mA, 350mV forward voltage). Operating temperature maximum is elevated to 150°C compared to the original 125°C specification. This part is suitable for applications requiring automotive-grade reliability and traceability.

Higher Current Capacity Alternatives:

PMEG3002AEL,315 and PMEG3005EL,315 (Nexperia USA Inc.) provide enhanced current ratings (200mA and 500mA respectively) while maintaining 30V reverse voltage rating. Both parts carry automotive-grade qualification (AEC-Q100) and 150°C maximum junction temperature. These alternatives are suitable for applications requiring current margin or thermal headroom beyond the original 100mA specification.

High Current Alternative:

BAS3010S02LRHE6327XTSA1 (Infineon Technologies) offers 1A current capacity at 30V reverse voltage. This part is classified as fast recovery (≤500ns) and is suitable for applications requiring significantly higher current handling than the original 100mA specification.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and active product status, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can RB521S-30L2-TP be used as a direct replacement for RB521S-30LP-TP?

A: Yes. RB521S-30L2-TP is a direct equivalent with identical electrical specifications (30V, 100mA, 350mV forward voltage) and SOD-882 package footprint. The primary difference is packaging format (Tape & Reel versus the original format) and active product status, making it the recommended substitute.

Q: What is the difference between the original RB521S-30LP-TP and RB521CS30L,315?

A: Both parts share identical electrical specifications and SOD-882 packaging. RB521CS30L,315 is manufactured by Nexperia USA Inc. (versus Micro Commercial Co for the original), carries automotive-grade AEC-Q100 qualification, and features a higher maximum junction temperature (150°C versus 125°C). These differences make RB521CS30L,315 suitable for automotive applications and higher thermal environments.

Q: Can I use PMEG3005EL,315 as a substitute if my circuit only requires 100mA?

A: Yes. PMEG3005EL,315 is rated for 500mA at 30V, which exceeds the 100mA requirement of the original part. The higher current rating provides design margin and does not create compatibility issues in circuits designed for 100mA operation. However, verify that forward voltage characteristics (500mV @ 500mA) are acceptable for your specific circuit application.

Q: What is the significance of the SOD-882 package specification?

A: SOD-882 is the physical package footprint for all listed substitute parts. This ensures mechanical compatibility with printed circuit board layouts designed for the original RB521S-30LP-TP. All substitute parts maintain this package specification, eliminating the need for PCB redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, ensuring regulatory compliance with environmental and hazardous substance restrictions. The original RB521S-30LP-TP is also ROHS3 compliant.

Q: What does MSL Level 1 (Unlimited) mean for moisture sensitivity?

A: MSL Level 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts, including the original, carry MSL Level 1 classification, eliminating moisture-related handling constraints.

Q: Why would I choose a higher current-rated part like PMEG3005EL,315 over the direct equivalent RB521S-30L2-TP?

A: Higher current-rated parts provide design margin for thermal performance and current headroom in applications where circuit conditions may occasionally exceed nominal 100mA operation. Automotive-qualified versions (PMEG3005EL,315) also provide AEC-Q100 traceability for regulated applications. Selection depends on specific application requirements for current capacity and thermal environment.

Q: Is the forward voltage difference between substitute parts significant?

A: Forward voltage differences must be evaluated within your specific circuit context. The original part specifies 350mV @ 10mA. Substitute parts range from 350mV to 800mV depending on current level and manufacturer. In low-power signal applications, these differences may be negligible. In power conversion circuits, forward voltage directly affects efficiency and heat dissipation, requiring detailed circuit analysis.

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