Equivalent & Substitute Parts Reference: RB481YT2R

Part Overview

The Rohm Semiconductor RB481YT2R is a diode array featuring two independent Schottky diodes with a DC reverse voltage rating of 30 V and average rectified current of 100 mA per diode. The device is housed in a surface-mount SC-75-4, SOT-543 package and provides low forward voltage drop and fast switching characteristics for rectification applications. The product status is listed as Obsolete, creating the need to identify suitable alternative models that can provide equivalent electrical and mechanical performance within the same category.

Key Parameters

Parameter	RB481YT2R Value
Diode Configuration	2 Independent
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io) (per Diode)	100 mA
Voltage - Forward (Vf) (Max) @ If	430 mV @ 100 mA
Current - Reverse Leakage @ Vr	30 µA @ 10 V
Speed	Small Signal =< 200mA (Io), Any Speed
Operating Temperature - Junction (Max)	125°C
Mounting Type	Surface Mount
Package / Case	SC-75-4, SOT-543
Supplier Device Package	EMD4
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution is determined strictly based on the following key parameters: diode configuration, technology, reverse voltage rating, average rectified current, forward voltage drop characteristics, reverse leakage current, speed rating, maximum junction temperature, mounting type, package compatibility, RoHS compliance, and REACH status. Only substitute parts matching or exceeding these criteria within the same product category (Diodes, Rectifiers) are included.

Parameter Comparison

Parameter	RB481YT2R	RB521SM-30FHT2R	RB521SM-30T2R
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V
Current - Average Rectified (Io)	100 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	430 mV @ 100 mA	470 mV @ 200 mA	470 mV @ 200 mA
Current - Reverse Leakage @ Vr	30 µA @ 10 V	30 µA @ 10 V	30 µA @ 10 V
Speed	Small Signal =< 200mA (Io), Any Speed	Small Signal =< 200mA (Io), Any Speed	Small Signal =< 200mA (Io), Any Speed
Operating Temperature - Junction (Max)	125°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The RB481YT2R is obsolete and is no longer available in active inventory. Both RB521SM-30FHT2R and RB521SM-30T2R are active, ROHS3 compliant, and REACH unaffected, making them suitable substitute candidates on the basis of electrical ratings, surface-mount compatibility, and environmental compliance.

Frequently Asked Questions (FAQ)

Q: What are the main electrical criteria for substituting RB481YT2R with RB521SM-30FHT2R or RB521SM-30T2R?
A: Substitute parts must match the Schottky technology, maximum reverse voltage rating, reverse leakage, and provide equal or greater average rectified current capability.

Q: How does the package compatibility affect substitution?
A: The RB481YT2R uses SC-75-4, SOT-543, while substitutes use SC-79, SOD-523. Ensure mechanical compatibility with the intended PCB footprint.

Q: Are there differences in operating temperature range?
A: Substitute diodes support a larger maximum junction temperature (150°C) compared to the RB481YT2R (125°C).

Q: Do these substitutes meet environmental and compliance requirements?
A: Both RB521SM-30FHT2R and RB521SM-30T2R are ROHS3 compliant and REACH unaffected, matching the main part’s compliance status.

Q: Is automotive grade qualification relevant in substitution?
A: RB521SM-30FHT2R is qualified to AEC-Q101 automotive grade. Evaluate the requirement strictly based on application specifications given.

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