RB161SS-20LDT2R Equivalent & Substitute Parts

Part Overview

The RB161SS-20LDT2R is a Schottky diode manufactured by Rohm Semiconductor, rated for 20V DC reverse voltage and 1A average rectified current in a 0603 (1608 Metric) surface mount package. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and availability constraints.

Substiute Parts

RB161SS-20LDT2R

Rohm SemiconductorIn Stock: 973RB161SS-20LDT2R Datasheet

Current PartRFQ

RB061QS-20T18R

Rohm SemiconductorIn Stock: 94415RB061QS-20T18R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB161SS-20LDT2R is determined by the following critical electrical and mechanical parameters:

Voltage Compatibility: The substitute part must support a minimum DC reverse voltage (Vr) of 20V to maintain circuit protection and reliability.

Current Rating: The substitute part must support the application's current requirements. The RB161SS-20LDT2R is rated for 1A average rectified current; substitute parts with equal or higher current ratings are acceptable.

Technology Classification: The main part is a Schottky diode with fast recovery characteristics. Substitute parts may include standard recovery diodes if voltage and current specifications are met, as the recovery speed parameter is application-dependent.

Package and Mounting: Surface mount packages are required. Physical package dimensions and supplier device packages may differ provided the component is compatible with the PCB layout and assembly process.

Compliance and Environmental: All substitute parts must maintain ROHS3 compliance, MSL rating of 1 or better, and REACH unaffected status to ensure regulatory and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

RB061QS-20T18R is the identified substitute for the obsolete RB161SS-20LDT2R based on the following criteria:

Voltage Equivalence: Both parts are rated for 20V DC reverse voltage, ensuring equivalent circuit protection and voltage handling capability.

Current Capability: The RB061QS-20T18R is rated for 2A average rectified current, exceeding the 1A requirement of the main part. This provides design margin and supports applications with increased current demands.

Regulatory Compliance: The substitute part maintains ROHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring continuity with environmental and supply chain requirements.

Product Availability: The RB061QS-20T18R is classified as active with 94,400 pieces in stock, providing immediate availability and long-term supply security compared to the obsolete main part.

Thermal Performance: The substitute part supports a maximum junction temperature of 150°C, exceeding the main part's 125°C rating and providing enhanced thermal margin.

Package Consideration: The substitute part uses the SMD1006 package (2-SMD, No Lead) rather than the KMD2 package (0603 1608 Metric). PCB layout and assembly process compatibility must be verified before implementation.

Frequently Asked Questions (FAQ)

Q: Can the RB061QS-20T18R directly replace the RB161SS-20LDT2R without circuit modification?

A: The RB061QS-20T18R meets the voltage and current requirements of the RB161SS-20LDT2R. However, the package differs (SMD1006 versus KMD2/0603), requiring PCB layout verification. Forward voltage characteristics differ slightly (470 mV @ 2A versus 420 mV @ 1A), which may affect circuit performance in applications sensitive to voltage drop. Recovery speed differs (standard versus fast recovery), which is relevant for high-frequency switching applications.

Q: What is the significance of the current rating difference between the main part (1A) and the substitute (2A)?

A: The substitute part's higher current rating (2A) provides design margin and supports applications with increased current demands. The part will operate safely at 1A, the original specification. The higher rating does not introduce compatibility issues in circuits designed for 1A operation.

Q: How does the package difference affect implementation?

A: The RB161SS-20LDT2R uses the 0603 (1608 Metric) KMD2 package, while the RB061QS-20T18R uses the SMD1006 2-SMD, No Lead package. These packages have different physical dimensions and footprints. PCB layout, component placement, and assembly process compatibility must be verified before design implementation.

Q: Are there compliance or regulatory concerns with substitution?

A: Both parts are ROHS3 compliant, MSL 1 rated, and REACH unaffected. No regulatory or compliance barriers exist for substitution from an environmental or supply chain perspective.

Q: What is the impact of the recovery speed difference?

A: The main part is classified as fast recovery (≤ 500ns), while the substitute is standard recovery (> 500ns). In low-frequency rectification applications, this difference is negligible. In high-frequency switching circuits, the slower recovery speed of the substitute may introduce additional switching losses or timing considerations. Application-specific circuit analysis is required to determine impact.

Q: Why is the reverse leakage current specification different between the parts?

A: The main part specifies 1 mA @ 20V, while the substitute specifies 200 µA @ 10V. These measurements are taken at different voltage and current conditions, making direct comparison difficult. Both values indicate acceptable leakage performance for general-purpose rectification applications.