SS34L MQG Equivalent & Substitute Parts

Part Overview

The SS34L MQG is an active 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 3 A and exhibits fast recovery characteristics suitable for high-frequency switching applications. The part is RoHS3 compliant and carries unlimited moisture sensitivity classification. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining functional compatibility within specified electrical parameters.

Substiute Parts

SS34L MQG

Taiwan Semiconductor CorporationIn Stock: 894SS34L 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 SS34L MQG is evaluated based on the following critical electrical and mechanical parameters:

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

Current Rating Compatibility: The substitute part current rating must equal or exceed the 3 A average rectified current (Io) specification of the main part to support equivalent load conditions.

Package and Mounting Compatibility: Both the main part and substitute must utilize the DO-219AB package format with surface mount technology to ensure mechanical and thermal compatibility with existing printed circuit board layouts.

Technology Consistency: Schottky diode technology must be maintained across all substitute parts to preserve the fast recovery characteristics and forward voltage drop profile required by the application.

Compliance and Status: All substitute parts must carry active product status and maintain RoHS3 compliance to satisfy regulatory and supply chain requirements.

The SS1FL4HM3/H from Vishay General Semiconductor - Diodes Division is identified as a substitute part; however, this part exhibits a reduced average rectified current rating of 1 A, which falls below the 3 A requirement of the main part. This part does not qualify as a direct functional substitute for applications requiring the full 3 A current capacity.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating Limitation:

The SS1FL4HM3/H substitute part carries a maximum average rectified current rating of 1 A, which is insufficient for applications requiring the full 3 A capacity of the SS34L MQG. Selection of this substitute is limited to circuit designs where the actual operating current does not exceed 1 A.

Voltage and Package Compatibility:

Both parts maintain identical 40 V reverse voltage ratings and utilize the DO-219AB surface mount package, ensuring electrical and mechanical compatibility at the circuit board level for applications within the specified voltage envelope.

Compliance and Availability:

Both the main part and substitute maintain active product status, RoHS3 compliance, and unlimited moisture sensitivity classification (MSL 1), satisfying regulatory requirements and supply chain continuity standards.

Temperature Operating Range:

The SS1FL4HM3/H provides an extended junction temperature operating range of -55 to 150°C compared to the main part's -55 to 125°C range, offering thermal margin for applications operating at elevated temperatures within the 125°C limit of the main part specification.

Reverse Leakage Characteristics:

The SS1FL4HM3/H exhibits lower reverse leakage current (200 µA @ 40 V) compared to the main part (500 µA @ 40 V), which may provide improved performance in low-leakage applications.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H directly replace the SS34L MQG in all applications?

A: No. The SS1FL4HM3/H is rated for a maximum average rectified current of 1 A, while the SS34L MQG is rated for 3 A. Direct substitution is limited to applications where the actual operating current does not exceed 1 A. Applications requiring the full 3 A capacity must use the SS34L MQG or an equivalent part with matching 3 A current rating.

Q: Are the package formats identical between these parts?

A: Yes. Both the SS34L MQG and SS1FL4HM3/H utilize the DO-219AB surface mount package format, ensuring identical footprint and mounting compatibility on printed circuit boards.

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

A: The SS1FL4HM3/H exhibits lower reverse leakage current (200 µA @ 40 V) compared to the SS34L MQG (500 µA @ 40 V). In applications sensitive to leakage current, the lower leakage of the substitute part may provide improved performance, provided the current rating limitation is acceptable.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the SS34L MQG and SS1FL4HM3/H are RoHS3 compliant, carry active product status, and maintain unlimited moisture sensitivity classification (MSL 1), satisfying equivalent regulatory and supply chain requirements.

Q: What is the impact of the extended temperature range of the SS1FL4HM3/H?

A: The SS1FL4HM3/H supports a junction temperature range of -55 to 150°C, compared to the SS34L MQG range of -55 to 125°C. This extended upper temperature limit provides additional thermal margin for applications operating near the 125°C limit of the main part, though both parts remain suitable for the same standard operating temperature envelope.

Q: Are there any differences in forward voltage characteristics between these parts?

A: Both parts specify a maximum forward voltage of 500 mV; however, this specification is measured at different current levels. The SS34L MQG is specified at 3 A, while the SS1FL4HM3/H is specified at 1 A. Forward voltage characteristics at equivalent current levels may differ between parts.