RB481YFHT2R Equivalent & Substitute Parts

Part Overview

The RB481YFHT2R is a Schottky diode array manufactured by Rohm Semiconductor, configured as 2 independent diodes rated for 30 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, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting automotive qualification standards.

Substiute Parts

RB481YFHT2R

Rohm SemiconductorIn Stock: 802RB481YFHT2R Datasheet

Current PartRFQ

RB521SM-30FHT2R

Rohm SemiconductorIn Stock: 11326RB521SM-30FHT2R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB481YFHT2R is determined by the following critical electrical and mechanical parameters:

Voltage Compatibility: The substitute part must maintain a DC reverse voltage rating of 30 V or greater to ensure safe operation within the original circuit specifications.

Current Rating: The substitute part must support the required current levels. The RB481YFHT2R is rated for 100 mA per diode; substitute parts with equal or higher current ratings are acceptable.

Technology: Schottky diode technology must be maintained to preserve forward voltage characteristics and switching speed performance.

Automotive Qualification: The substitute part must carry AEC-Q101 qualification to meet automotive-grade reliability and quality standards.

RoHS Compliance: The substitute part must maintain ROHS3 compliance status.

Moisture Sensitivity: The substitute part must maintain MSL 1 (Unlimited) classification.

The RB521SM-30FHT2R meets all substitution criteria through equivalent voltage rating, higher current capacity, matching technology, and identical automotive qualification status.

Parameter Comparison

Engineering Selection Recommendations

The RB521SM-30FHT2R is the qualified substitute for the obsolete RB481YFHT2R based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical DC reverse voltage ratings of 30 V and equivalent reverse leakage current specifications of 30 µA @ 10 V. The substitute part provides increased current capacity (200 mA versus 100 mA), which is compatible with circuits designed for the original 100 mA specification.

Compliance Status: Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance certification, ensuring continued suitability for automotive applications.

Product Availability: The RB481YFHT2R is classified as Obsolete with limited inventory (720 pcs). The RB521SM-30FHT2R is Active with substantial inventory availability (11,285 pcs), providing long-term supply continuity.

Packaging Consideration: The substitute part uses SC-79 (SOD-523) packaging versus the original SC-75-4 (SOT-543) configuration. PCB layout modifications are required to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can the RB521SM-30FHT2R directly replace the RB481YFHT2R without circuit modifications?

A: Electrical substitution is valid based on voltage, current, and leakage specifications. However, the different package footprints (SC-79 versus SC-75-4) require PCB layout redesign. The substitute part's higher current rating (200 mA) is compatible with 100 mA circuit requirements.

Q: What is the significance of the higher current rating in the substitute part?

A: The RB521SM-30FHT2R is rated for 200 mA average rectified current, compared to 100 mA in the original part. This higher rating provides additional design margin and does not create incompatibility with circuits designed for lower current operation.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the RB481YFHT2R and RB521SM-30FHT2R carry AEC-Q101 automotive qualification and are classified as Automotive grade components.

Q: What packaging differences exist between these parts?

A: The RB481YFHT2R uses SC-75-4 (SOT-543) surface mount packaging, while the RB521SM-30FHT2R uses SC-79 (SOD-523) packaging. These are different physical footprints requiring PCB redesign for component placement.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification.

Q: Why is the RB481YFHT2R classified as Obsolete?

A: The RB481YFHT2R is no longer in active production. The RB521SM-30FHT2R represents the current active equivalent from Rohm Semiconductor for new designs and production continuity.