SS34L RQG Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34L RQG 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, indicating robust handling characteristics for standard manufacturing environments. Substitute parts are identified to address inventory availability, extended temperature range requirements, or automotive-grade qualification needs while maintaining electrical and mechanical compatibility.

Substiute Parts

SS34L RQG

Taiwan Semiconductor CorporationIn Stock: 1131SS34L 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 SS34L RQG is permissible with the SS1FL4HM3/H based on the following electrical and mechanical compatibility criteria:

Matching Parameters:

• Voltage rating: Both parts rated at 40 V maximum reverse voltage
• Package format: Both utilize DO-219AB surface mount package
• Technology: Both employ Schottky rectifier technology
• Speed classification: Both meet fast recovery specifications (≤ 500ns, > 200mA)
• Compliance: Both are ROHS3 compliant with unlimited moisture sensitivity (MSL 1)

Substitution Constraint: The SS1FL4HM3/H carries a reduced average rectified current rating of 1 A compared to the SS34L RQG rating of 3 A. This substitute part is suitable only for applications where the circuit current requirement does not exceed 1 A. The substitute part provides extended operating temperature range (-55 to 150°C versus -55 to 125°C) and includes automotive-grade qualification (AEC-Q101), making it applicable for temperature-critical or automotive environments operating within the 1 A current specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Application (≤ 1 A Circuit Current): The SS1FL4HM3/H substitute part is suitable for direct replacement in applications where circuit current does not exceed 1 A. This substitute provides equivalent electrical performance with the added benefit of extended junction temperature range (-55 to 150°C) and automotive-grade qualification (AEC-Q101). Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification, ensuring compatibility with standard manufacturing processes.

Applications Requiring 1 A to 3 A Current: The SS34L RQG must be retained for circuits requiring average rectified current between 1 A and 3 A. The SS1FL4HM3/H substitute cannot be used in this current range due to its 1 A maximum rating.

Compliance and Certification: Both parts are ROHS3 compliant and REACH unaffected. The SS1FL4HM3/H carries additional automotive qualification (AEC-Q101), making it the preferred choice for automotive applications operating within the 1 A specification. The SS34L RQG remains the standard selection for non-automotive applications requiring the full 3 A current capacity.

Frequently Asked Questions (FAQ)

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

A: No. The SS1FL4HM3/H is rated for maximum 1 A average rectified current, while the SS34L RQG is rated for 3 A. Substitution is valid only for circuits where the actual operating current does not exceed 1 A. Exceeding this current rating on the substitute part will result in component failure.

Q: What is the primary difference between these two parts?

A: The primary difference is the current rating. The SS34L RQG supports 3 A, while the SS1FL4HM3/H supports 1 A. Both parts share identical 40 V reverse voltage rating, DO-219AB package format, and fast recovery Schottky technology. The substitute offers extended temperature range and automotive qualification.

Q: Are the packages physically identical?

A: Yes. Both parts use the DO-219AB surface mount package format, ensuring mechanical compatibility on printed circuit boards. The footprint and solder pad layout are identical.

Q: Does the SS1FL4HM3/H have better performance characteristics?

A: The SS1FL4HM3/H exhibits lower reverse leakage current (200 µA versus 500 µA at 40 V) and supports extended operating temperature range (-55 to 150°C versus -55 to 125°C). However, these advantages apply only within the 1 A current specification. For applications requiring 3 A operation, the SS34L RQG is the only suitable option.

Q: Are both parts RoHS compliant?

A: Yes. Both the SS34L RQG and SS1FL4HM3/H are ROHS3 compliant with unlimited moisture sensitivity (MSL 1), suitable for standard manufacturing and storage conditions.

Q: What does AEC-Q101 qualification mean for the SS1FL4HM3/H?

A: AEC-Q101 is an automotive industry qualification standard. The SS1FL4HM3/H meets this standard, making it suitable for automotive applications. The SS34L RQG does not carry this qualification and should not be used in automotive applications requiring AEC-Q101 compliance.

Q: Can I use the SS34L RQG in place of the SS1FL4HM3/H?

A: Yes. The SS34L RQG can be used in any application where the SS1FL4HM3/H is specified, provided the circuit design does not require the extended temperature range or automotive qualification of the substitute. The higher current rating of the SS34L RQG does not create compatibility issues in lower-current applications.