RB561SS-40T2R Equivalent & Substitute Parts

Part Overview

The RB561SS-40T2R is a Schottky diode manufactured by Rohm Semiconductor, rated for 40 V DC reverse voltage with 500 mA average rectified current. This component is packaged in a 0603 (1608 Metric) surface mount configuration using the KMD2 supplier device package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing production and procurement requirements.

Substiute Parts

RB561SS-40T2R

Rohm SemiconductorIn Stock: 1038RB561SS-40T2R Datasheet

Current PartRFQ

RB561VM-40TE-17

Rohm SemiconductorIn Stock: 125471RB561VM-40TE-17 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB561SS-40T2R is determined by electrical and mechanical parameter equivalence within the Schottky diode category. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 500 mA
• Voltage - Forward (Vf) (Max) @ If: 560 mV @ 500 mA
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
• Operating Temperature - Junction (Max): 125°C

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Technology: Schottky

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The RB561VM-40TE-17 meets all electrical and compliance requirements. Variation in package configuration (KMD2 versus UMD2) and reverse leakage current (80 µA versus 300 µA) are within acceptable substitution parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

The RB561VM-40TE-17 is the qualified substitute for the obsolete RB561SS-40T2R. Both components share the same base product number (RB561) and are manufactured by Rohm Semiconductor, ensuring design compatibility at the functional level.

Selection Basis:

The RB561VM-40TE-17 maintains electrical equivalence across all critical parameters: 40 V reverse voltage rating, 500 mA average rectified current, 560 mV forward voltage drop, and fast recovery switching characteristics. Both parts operate at a maximum junction temperature of 125°C and comply with ROHS3 and REACH requirements.

The substitute part is currently in active production status with substantial inventory availability (125,400 pieces), providing supply chain continuity for the obsolete RB561SS-40T2R. Both components carry MSL Level 1 (Unlimited) moisture sensitivity classification, indicating identical handling and storage requirements.

Package configuration differs between the main part (KMD2 in 0603 metric) and the substitute (UMD2 in SC-90/SOD-323F), requiring PCB layout verification. Reverse leakage current specification increases from 80 µA to 300 µA at 40 V, remaining within acceptable operational parameters for Schottky diode applications.

Frequently Asked Questions (FAQ)

Q: Can the RB561VM-40TE-17 directly replace the RB561SS-40T2R without circuit modification?

A: Electrical substitution is valid. The reverse voltage, forward voltage, current rating, and switching speed are identical. PCB layout modification is required due to package configuration differences (KMD2 versus UMD2).

Q: What is the significance of the increased reverse leakage current (300 µA versus 80 µA)?

A: The reverse leakage current specification for the substitute part is higher but remains within acceptable limits for Schottky diode operation. Circuit designers must evaluate leakage impact on specific application requirements, particularly in low-power or precision applications.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the RB561SS-40T2R and RB561VM-40TE-17 are ROHS3 compliant and REACH unaffected, with identical MSL Level 1 (Unlimited) moisture sensitivity ratings.

Q: What are the package differences between these parts?

A: The main part uses KMD2 package in 0603 (1608 Metric) configuration. The substitute uses UMD2 package in SC-90 or SOD-323F configuration. These are different physical footprints requiring PCB redesign.

Q: Why is the RB561SS-40T2R classified as obsolete?

A: The RB561SS-40T2R is no longer in active production. The RB561VM-40TE-17 represents the current active equivalent from Rohm Semiconductor's product line.

Q: Is the RB561VM-40TE-17 available in the same packaging format as the original part?

A: No. The substitute is supplied in Tape & Reel (TR) format with Cut Tape (CT) and Digi-Reel® options. The original part packaging format is not specified in available data.