Equivalent & Substitute Parts for RB521AS-40T2R

Part Overview

The RB521AS-40T2R is a Schottky diode manufactured by Rohm Semiconductor, classified under diodes, rectifiers. This surface mount device, supplied in a 2-SMD, No Lead package (VML2), offers a maximum reverse voltage of 40 V and an average rectified current of 200 mA. With a forward voltage drop of 450 mV at 100 mA and a maximum junction temperature of 150°C, it is suitable for low voltage, small current rectification. The part is now listed as obsolete, necessitating the identification of alternative models for ongoing designs or maintenance.

Key Parameters

Parameter	RB521AS-40T2R
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	450 mV @ 100 mA
Current - Reverse Leakage @ Vr	90 µA @ 40 V
Mounting Type	Surface Mount
Package / Case	2-SMD, No Lead
Operating Temperature - Junction	150°C (Max)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

The substitution of RB521AS-40T2R is determined strictly by matching critical parameters relevant for Schottky diodes in rectifier applications. These parameters include:

Schottky technology
Maximum reverse voltage (Vr) of 40 V
Average rectified current (Io) rating
Forward voltage drop (Vf) at specified test current
Reverse leakage current at specified reverse voltage
Surface mount configuration and compatible package type
Maximum operating junction temperature
Compliance with ROHS3 and REACH, and equivalent or better MSL

Parameter Comparison

Parameter	RB521AS-40T2R	RB161QS-40T18R
Manufacturer	Rohm Semiconductor	Rohm Semiconductor
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V
Current - Average Rectified (Io)	200 mA	1A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 100 mA	600 mV @ 1 A
Current - Reverse Leakage @ Vr	90 µA @ 40 V	100 µA @ 10 V
Mounting Type	Surface Mount	Surface Mount
Package / Case	2-SMD, No Lead	2-SMD, No Lead
Operating Temperature - Junction	150°C (Max)	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The RB521AS-40T2R is classified as obsolete, while RB161QS-40T18R is listed as active. Both devices are ROHS3 compliant and REACH unaffected, with a moisture sensitivity level of 1 (unlimited). When selecting an engineering substitute, verify the product status and confirm compliance with environmental directives and certifications specified in the provided parameters.

Frequently Asked Questions (FAQ)

Q1: What elements make RB161QS-40T18R a substitute for RB521AS-40T2R?
A1: RB161QS-40T18R matches the Schottky technology, reverse voltage rating, mount type, package, maximum junction temperature, ROHS compliance, and MSL of the RB521AS-40T2R.

Q2: Are there considerations regarding package compatibility?
A2: Both components use a surface mount, 2-SMD, No Lead package, satisfying the requirement for mechanical compatibility within this part category.

Q3: Is there any difference in compliance and certifications?
A3: Both parts are ROHS3 compliant and REACH unaffected, with the same moisture sensitivity level.

Q4: Are the electrical parameters functionally equivalent?
A4: Substitution is based on matching technology, reverse voltage rating, package type, temperature rating, and compliance, as provided. Other electrical specifications are listed for direct comparison.

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