SS24L MQG Equivalent & Substitute Parts

Part Overview

The SS24L MQG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the Sub SMA package format. This component operates at a maximum reverse voltage of 40 V with an average rectified current rating of 2 A, featuring fast recovery characteristics suitable for high-frequency switching applications. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level rating. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

SS24L MQG

Taiwan Semiconductor CorporationIn Stock: 816SS24L MQG 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 MQG is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating Compatibility: The substitute part must maintain the same maximum reverse voltage specification of 40 V to ensure safe operation within the intended circuit application.

Package Compatibility: Both the main part and substitute must use the DO-219AB surface mount package format to ensure mechanical fit and PCB assembly compatibility without design modification.

Technology Alignment: Schottky diode technology must be maintained to preserve the fast recovery switching characteristics and forward voltage drop profile required by the application.

Operating Temperature Range: The substitute part must support the full operating temperature range of -55°C to 150°C junction temperature to ensure reliability across all environmental conditions.

Current Rating Consideration: While the SS24L MQG is rated for 2 A average rectified current, substitute parts with equal or higher current ratings are electrically compatible. Parts with lower current ratings do not meet the substitution criteria.

Compliance Requirements: RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) are mandatory for substitution to maintain regulatory and environmental standards.

The SS1FL4HM3/H from Vishay General Semiconductor meets all substitution criteria with the exception of current rating, which is specified at 1 A versus the 2 A rating of the main part.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitution Consideration: The SS1FL4HM3/H is electrically and mechanically compatible with the SS24L MQG across all critical parameters with one exception: the average rectified current rating is specified at 1 A compared to the 2 A rating of the main part. This lower current rating must be evaluated against the actual circuit current requirements. If the application circuit operates at or below 1 A, the substitute part is fully compatible. If the application requires sustained current operation above 1 A, the substitute part does not meet the electrical requirements.

Compliance and Qualification: Both parts maintain active production status and carry RoHS3 compliance certification. The SS1FL4HM3/H includes AEC-Q101 automotive qualification, which provides additional reliability assurance for applications requiring automotive-grade components. The substitute part demonstrates superior reverse leakage characteristics at 200 µA compared to 400 µA for the main part, indicating lower standby current consumption.

Packaging and Assembly: Both parts use identical DO-219AB surface mount packages with unlimited moisture sensitivity level rating, ensuring direct PCB assembly compatibility without design modification or requalification of manufacturing processes.

Inventory and Sourcing: The SS1FL4HM3/H is available in significantly higher inventory quantities (33,182 pieces) compared to the main part (800 pieces), supporting extended procurement lead times and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H be used as a direct replacement for the SS24L MQG in all applications?

A: The SS1FL4HM3/H is mechanically and electrically compatible with the SS24L MQG for applications operating at or below 1 A average rectified current. Applications requiring sustained operation above 1 A must use the SS24L MQG or an equivalent part with 2 A or higher current rating. All other electrical parameters, including voltage rating, forward voltage drop, and switching speed, are compatible.

Q: What is the significance of the different reverse leakage current specifications?

A: The SS1FL4HM3/H specifies 200 µA reverse leakage at 40 V, compared to 400 µA for the SS24L MQG. Lower reverse leakage current reduces standby power consumption and heat generation in the circuit. This represents an improvement in the substitute part and does not create compatibility issues.

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

A: Both the SS24L MQG and SS1FL4HM3/H meet fast recovery specifications of 500 nanoseconds or less for currents exceeding 200 mA, making them suitable for high-frequency switching applications. The switching speed characteristics are identical between the two parts.

Q: What is the difference between the Sub SMA and DO-219AB package designations?

A: Sub SMA and DO-219AB refer to the same physical package format used for surface mount Schottky diodes. The SS24L MQG uses the "Sub SMA" supplier device package designation, while the SS1FL4HM3/H uses the "DO-219AB (SMF)" designation. These are equivalent package specifications with identical mechanical and electrical footprints for PCB assembly.

Q: Does the AEC-Q101 qualification of the SS1FL4HM3/H provide additional benefits?

A: AEC-Q101 is an automotive industry qualification standard that certifies component reliability for automotive applications. If the application requires automotive-grade components, the SS1FL4HM3/H meets this requirement. For non-automotive applications, this qualification does not provide additional functional benefits but indicates higher manufacturing and quality standards.

Q: Can the SS24L MQG and SS1FL4HM3/H be used interchangeably in the same circuit design?

A: Interchangeability depends on the circuit's current requirements. If the circuit operates at 1 A or below, the parts are fully interchangeable. If the circuit requires sustained operation above 1 A, only the SS24L MQG or equivalent 2 A rated parts are suitable. PCB layout and assembly processes remain identical for both parts due to package compatibility.