RB480Y-40FHT2R Equivalent & Substitute Parts

Part Overview

The RB480Y-40FHT2R is a Schottky diode array manufactured by Rohm Semiconductor, featuring two independent diodes rated for 40 V DC reverse voltage and 200 mA average rectified current per diode. The device is packaged in SC-75-4 (SOT-543) surface mount configuration and is qualified to AEC-Q101 automotive standards.

This part is classified as obsolete. Locating equivalent substitute components is necessary to support ongoing production requirements, maintenance operations, and design continuity where this diode array is specified in existing applications.

Key Parameters

Parameter	Value
Diode Configuration	2 Independent
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io) (per Diode)	200 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 100 mA
Current - Reverse Leakage @ Vr	10 µA @ 40 V
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RB480Y-40FHT2R is determined by electrical and mechanical parameter equivalence within the Schottky diode rectifier category. The following parameters establish substitution eligibility:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 200 mA per diode
Voltage - Forward (Vf) (Max) @ If: 550 mV @ 100 mA
Current - Reverse Leakage @ Vr: 10 µA @ 40 V
Technology: Schottky

Mechanical & Compliance Parameters (Must Match):

Mounting Type: Surface Mount
Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Configuration Consideration: The RB480Y-40FHT2R contains 2 independent diodes. Substitute parts must provide equivalent electrical performance per diode element. Package form factor may differ provided all electrical and compliance specifications are maintained.

Parameter Comparison

Parameter	RB480Y-40FHT2R (Main Part)	RB520SM-40FHT2R (Substitute)
Manufacturer	Rohm Semiconductor	Rohm Semiconductor
Category	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V
Current - Average Rectified (Io)	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 100 mA	550 mV @ 100 mA
Current - Reverse Leakage @ Vr	10 µA @ 40 V	10 µA @ 40 V
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed	Small Signal ≤ 200 mA (Io), Any Speed
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
Mounting Type	Surface Mount	Surface Mount
Package / Case	SC-75-4, SOT-543	SC-79, SOD-523
Supplier Device Package	EMD4	EMD2
Operating Temperature - Junction (Max)	125°C	150°C
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The RB520SM-40FHT2R is an active substitute for the obsolete RB480Y-40FHT2R. Both components are manufactured by Rohm Semiconductor and maintain identical electrical specifications across all critical parameters: reverse voltage rating, forward current capacity, forward voltage drop, and reverse leakage current.

Both parts carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance, ensuring suitability for regulated applications. The RB520SM-40FHT2R offers the additional advantage of an elevated maximum junction temperature rating (150°C versus 125°C), providing enhanced thermal margin in high-temperature operating environments.

The primary difference between these components is the package form factor: the main part uses SC-75-4 (SOT-543) configuration, while the substitute uses SC-79 (SOD-523) configuration. This packaging difference requires PCB layout modification but does not affect electrical performance or compliance status.

The RB520SM-40FHT2R is currently in active production with substantial inventory availability, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the RB520SM-40FHT2R directly replace the RB480Y-40FHT2R without circuit modification?

A: Electrical substitution is valid. Both components deliver identical electrical performance across all specified parameters. However, the different package form factors (SC-75-4 versus SC-79) require PCB layout changes. Footprint redesign is necessary for physical mounting compatibility.

Q: What is the significance of the different package designations (EMD4 versus EMD2)?

A: EMD4 and EMD2 are Rohm Semiconductor supplier device package codes. EMD4 corresponds to the SC-75-4 (SOT-543) package, while EMD2 corresponds to the SC-79 (SOD-523) package. These designations reflect different physical form factors and lead configurations.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the RB480Y-40FHT2R and RB520SM-40FHT2R carry automotive-grade classification and AEC-Q101 qualification, confirming suitability for automotive circuit applications.

Q: What does the higher junction temperature rating (150°C versus 125°C) on the substitute part mean?

A: The RB520SM-40FHT2R maintains specified electrical performance at higher junction temperatures than the main part. This provides additional thermal operating margin in applications where junction temperature approaches the maximum rating.

Q: Why is the main part classified as obsolete?

A: Product obsolescence indicates that the RB480Y-40FHT2R is no longer in active production. The RB520SM-40FHT2R is the active equivalent, ensuring continued availability for new designs and production support.

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

A: No. Both components maintain identical RoHS3 compliance status and REACH unaffected classification. Moisture sensitivity levels are equivalent at MSL 1 (Unlimited).

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