SS24L RQG Equivalent & Substitute Parts

Part Overview

The SS24L RQG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 2 A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status and is fully RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Schottky diodes of this specification are utilized in power conversion circuits, reverse polarity protection, and high-frequency switching applications where fast recovery characteristics are essential. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and component availability options while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

SS24L RQG

Taiwan Semiconductor CorporationIn Stock: 1206SS24L RQG Datasheet

Current PartRFQ

SS1FL4HM3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 33227SS1FL4HM3/H Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS24L RQG is determined by strict equivalence across the following critical parameters:

Voltage Rating: The substitute part must maintain a DC reverse voltage (Vr) rating of 40 V or greater to ensure safe operation in the same circuit topology.

Current Rating: The substitute part current rating must equal or exceed 2 A average rectified current (Io) to handle the same load conditions without thermal stress or performance degradation.

Forward Voltage Characteristics: Forward voltage drop (Vf) at rated current must not exceed 500 mV @ 2 A to maintain circuit efficiency and thermal performance.

Recovery Speed: Fast recovery characteristics (≤ 500 ns, > 200 mA) are required for high-frequency switching applications and must be maintained in substitute parts.

Package Compatibility: The substitute part must use the DO-219AB package (Sub SMA form factor) to ensure mechanical fit and PCB layout compatibility.

Operating Temperature Range: The substitute part must support the full -55°C to 150°C junction temperature range.

Compliance Standards: RoHS3 compliance and MSL 1 rating are mandatory for supply chain and manufacturing process compatibility.

The SS1FL4HM3/H from Vishay General Semiconductor meets these substitution criteria with the exception of current rating, which is specified at 1 A rather than 2 A. This represents a downgrade in current capacity and requires circuit-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The SS24L RQG remains the preferred component for applications requiring 2 A average rectified current at 40 V reverse voltage with Sub SMA surface mount packaging. This part is Active status with full RoHS3 compliance and unlimited moisture sensitivity level, suitable for standard commercial and industrial applications.

Substitute Consideration - SS1FL4HM3/H:

The SS1FL4HM3/H from Vishay General Semiconductor is electrically compatible at the voltage and recovery speed levels but is rated for 1 A average rectified current, representing a 50% reduction in current capacity compared to the main part. This substitute is suitable only for circuit designs where the actual load current does not exceed 1 A. The substitute part carries Automotive grade qualification and AEC-Q101 certification, providing enhanced reliability documentation for automotive applications. Reverse leakage current is improved at 200 µA versus 400 µA on the main part.

Compliance and Regulatory Status:

Both parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.10.0080. Both maintain MSL 1 (unlimited) moisture sensitivity level, indicating no special storage or handling requirements during manufacturing and assembly.

Supply Chain Availability:

The SS24L RQG has 1,139 pieces in current inventory. The SS1FL4HM3/H substitute has significantly higher availability at 33,182 pieces in Tape & Reel packaging, providing supply chain flexibility for high-volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H be used as a direct replacement for the SS24L RQG?

A: The SS1FL4HM3/H is mechanically and electrically compatible in terms of package (DO-219AB), voltage rating (40 V), and recovery speed characteristics. However, the current rating is reduced from 2 A to 1 A. Direct substitution is only valid if the circuit design operates at 1 A or below. For applications requiring 2 A operation, the SS24L RQG must be used.

Q: What are the key differences between these two Schottky diodes?

A: The primary difference is current rating: SS24L RQG is rated for 2 A while SS1FL4HM3/H is rated for 1 A. Secondary differences include reverse leakage current (400 µA versus 200 µA) and automotive qualification status (SS1FL4HM3/H carries AEC-Q101 certification). Both share identical voltage ratings, recovery speed, forward voltage characteristics, and package specifications.

Q: Are both parts suitable for high-frequency switching applications?

A: Yes. Both the SS24L RQG and SS1FL4HM3/H meet the fast recovery specification of ≤ 500 ns at currents greater than 200 mA, making them suitable for high-frequency switching applications within their respective current ratings.

Q: What is the significance of the DO-219AB package designation?

A: DO-219AB is the standardized package designation for Sub SMA surface mount diodes. Both parts use this identical package, ensuring mechanical compatibility with PCB layouts, solder reflow processes, and automated assembly equipment designed for this form factor.

Q: Does the automotive qualification of the SS1FL4HM3/H affect its use in non-automotive applications?

A: No. Automotive qualification (AEC-Q101) represents additional testing and reliability documentation but does not restrict use in non-automotive applications. The part is fully suitable for commercial and industrial use.

Q: What is the operating temperature range for both parts?

A: Both the SS24L RQG and SS1FL4HM3/H operate across a junction temperature range of -55°C to 150°C, providing identical thermal operating specifications for circuit design purposes.

Q: Are there any moisture sensitivity or storage concerns with these parts?

A: No. Both parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture control or dry storage requirements during manufacturing, assembly, or storage operations.

Q: How do the reverse leakage current specifications compare?

A: The SS24L RQG specifies 400 µA reverse leakage at 40 V, while the SS1FL4HM3/H specifies 200 µA at the same voltage. The lower leakage current of the substitute part represents improved performance in this parameter, though both values are typical for Schottky diodes in this voltage class.