RB481Y-90FHT2R Equivalent & Substitute Parts

Part Overview

The RB481Y-90FHT2R is a Schottky diode array manufactured by Rohm Semiconductor, featuring two independent diodes rated for 90 V DC reverse voltage and 100 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 design requirements, maintenance operations, and production continuity where the original part is no longer available from primary sources.

Substiute Parts

RB481Y-90FHT2R

Rohm SemiconductorIn Stock: 1119RB481Y-90FHT2R Datasheet

Current PartRFQ

BAT41KFILM

STMicroelectronicsIn Stock: 125236BAT41KFILM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB481Y-90FHT2R is determined by the following critical parameters:

Technology Match: Both the main part and substitute must employ Schottky diode technology to maintain equivalent switching characteristics and forward voltage performance.

Voltage Rating Compatibility: The substitute must meet or exceed the 90 V DC reverse voltage specification. The BAT41KFILM provides 100 V, which satisfies this requirement with adequate margin.

Current Capacity: The substitute must support the required current levels. The RB481Y-90FHT2R operates at 100 mA per diode; the BAT41KFILM is rated for 200 mA, providing sufficient capacity.

Mounting and Packaging: Both parts are surface mount devices. While the RB481Y-90FHT2R uses SC-75-4 (SOT-543) packaging and the BAT41KFILM uses SC-79 (SOD-523) packaging, both are single-diode surface mount packages suitable for automated assembly. Circuit board layout modifications are required due to different package footprints.

Compliance and Qualification: The substitute must maintain equivalent environmental and regulatory compliance. Both parts are ROHS3 compliant, REACH unaffected, and possess MSL 1 rating.

Product Status: The substitute BAT41KFILM is active and in production, ensuring long-term availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

The BAT41KFILM from STMicroelectronics is a functional substitute for the obsolete RB481Y-90FHT2R based on the following engineering criteria:

Voltage and Current Specifications: The BAT41KFILM exceeds the voltage rating (100 V vs. 90 V) and current capacity (200 mA vs. 100 mA) of the original part, ensuring safe operation within the design envelope.

Technology Equivalence: Both devices employ Schottky diode technology, maintaining identical switching behavior and forward voltage characteristics within the specified operating ranges.

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH unaffected status. The BAT41KFILM does not carry automotive qualification (AEC-Q101); applications requiring automotive-grade certification must evaluate this difference against specific design requirements.

Product Availability: The BAT41KFILM is in active production with substantial inventory availability, providing supply chain continuity and long-term sourcing stability.

Packaging Consideration: The substitute requires circuit board redesign due to different package footprints (SOT-543 vs. SOD-523). Single-diode configuration of the BAT41KFILM necessitates dual-device implementation to replicate the two-diode array functionality of the original part.

Frequently Asked Questions (FAQ)

Q: Can the BAT41KFILM directly replace the RB481Y-90FHT2R without circuit modifications?

A: No. The BAT41KFILM is a single-diode device in SOD-523 packaging, while the RB481Y-90FHT2R is a dual-diode array in SOT-543 packaging. Circuit board layout modifications are required. Additionally, two BAT41KFILM devices are necessary to replicate the two-diode configuration of the original part.

Q: What are the key electrical differences between these parts?

A: The BAT41KFILM provides higher voltage rating (100 V vs. 90 V) and higher current capacity (200 mA vs. 100 mA). Forward voltage at rated current differs: 610 mV @ 100 mA for the RB481Y-90FHT2R versus 1 V @ 200 mA for the BAT41KFILM. Reverse leakage current is significantly lower in the BAT41KFILM (100 nA @ 50 V vs. 100 µA @ 90 V).

Q: Is the BAT41KFILM suitable for automotive applications?

A: The BAT41KFILM is not qualified to AEC-Q101 automotive standards. The original RB481Y-90FHT2R carries automotive qualification. Applications requiring automotive-grade components must evaluate whether this difference is acceptable for the specific design context.

Q: What is the impact of different package types on implementation?

A: The RB481Y-90FHT2R uses SC-75-4 (SOT-543) packaging with a four-pin configuration for two independent diodes. The BAT41KFILM uses SC-79 (SOD-523) packaging with a two-pin single-diode configuration. PCB footprint, trace routing, and component placement must be redesigned accordingly.

Q: Are both parts RoHS compliant?

A: Yes. Both the RB481Y-90FHT2R and BAT41KFILM are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the temperature operating range difference?

A: The RB481Y-90FHT2R is rated to 125°C maximum junction temperature, while the BAT41KFILM is rated to 150°C. The higher rating of the substitute provides additional thermal margin in high-temperature applications.