SS34L R3G Equivalent & Substitute Parts

Part Overview

The SS34L R3G 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 an unlimited moisture sensitivity level (MSL 1), indicating robust handling characteristics for standard manufacturing environments. Substitute parts are identified to address inventory availability, extended temperature range requirements, or specific qualification standards while maintaining electrical and mechanical compatibility within the defined parameter envelope.

Substiute Parts

SS34L R3G

Taiwan Semiconductor CorporationIn Stock: 904SS34L R3G Datasheet

Current PartRFQ

SS1FL4HM3/H

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS34L R3G with the SS1FL4HM3/H is determined by equivalence in the following critical parameters:

Electrical Compatibility Parameters:

• Voltage - DC Reverse (Vr) (Max): Both parts rated at 40 V
• Technology: Both are Schottky diodes with fast recovery characteristics (≤ 500ns, > 200mA)
• Voltage - Forward (Vf) (Max): Both specified at 500 mV maximum forward voltage
• Speed Classification: Both meet fast recovery requirements
• Current - Reverse Leakage: Both within acceptable leakage specifications at rated voltage

Mechanical Compatibility Parameters:

• Mounting Type: Both are surface mount devices
• Package / Case: Both use DO-219AB package format
• Supplier Device Package: Both compatible with Sub SMA / DO-219AB (SMF) footprints

Compliance Parameters:

• RoHS Status: Both ROHS3 compliant
• Moisture Sensitivity Level: Both rated MSL 1 (Unlimited)
• REACH Status: Both REACH Unaffected

Current Rating Consideration: The SS1FL4HM3/H is rated for 1 A average rectified current, which is lower than the SS34L R3G 3 A rating. This part functions as a substitute only in applications where the circuit current requirement does not exceed 1 A. For circuits requiring the full 3 A capability of the SS34L R3G, this substitute is not suitable.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The SS34L R3G remains the specified component for applications requiring 3 A average rectified current capacity at 40 V reverse voltage with the defined electrical and thermal characteristics.

Substitution Applicability:

The SS1FL4HM3/H (Vishay General Semiconductor) is a valid substitute for the SS34L R3G under the following conditions:

1. Current Requirement: The circuit application requires a maximum average rectified current not exceeding 1 A. The substitute part is rated for 1 A and cannot support higher current demands.

2. Voltage Compatibility: The application operates within the 40 V reverse voltage rating. Both parts are electrically equivalent at this voltage level.

3. Package Compatibility: The circuit board layout accommodates the DO-219AB package format. Both parts use identical package geometry and footprint.

4. Temperature Environment: The substitute part supports an extended junction temperature range of -55 to 150 °C, compared to the main part's -55 to 125 °C range. This provides additional thermal margin in high-temperature applications.

5. Compliance Requirements: Both parts meet RoHS3 compliance and carry unlimited moisture sensitivity level (MSL 1). The substitute part carries AEC-Q101 automotive qualification, which may be required for automotive or mission-critical applications.

6. Leakage Characteristics: The substitute part exhibits lower reverse leakage current (200 µA @ 40 V) compared to the main part (500 µA @ 40 V), which may be advantageous in low-leakage applications.

Non-Substitutable Scenarios:

The SS1FL4HM3/H cannot substitute for the SS34L R3G in applications requiring the full 3 A current capacity. Selection of an alternative 3 A rated Schottky diode in the DO-219AB package is necessary for such applications.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H replace the SS34L R3G in all applications?

A: No. The SS1FL4HM3/H is rated for 1 A average rectified current, while the SS34L R3G is rated for 3 A. Substitution is valid only for applications where the circuit current does not exceed 1 A. For circuits requiring 3 A capacity, the substitute part is not suitable.

Q: Are the packages physically identical?

A: Yes. Both the SS34L R3G and SS1FL4HM3/H use the DO-219AB package format. The physical footprint and mounting characteristics are equivalent, allowing direct board-level substitution from a mechanical standpoint.

Q: What is the difference in reverse leakage between these parts?

A: The SS34L R3G exhibits 500 µA reverse leakage at 40 V, while the SS1FL4HM3/H exhibits 200 µA reverse leakage at 40 V. The substitute part has lower leakage, which may be beneficial in precision analog circuits or low-power applications.

Q: Does the substitute part support higher temperatures?

A: Yes. The SS1FL4HM3/H supports a junction temperature range of -55 to 150 °C, compared to the SS34L R3G range of -55 to 125 °C. The substitute part provides an additional 25 °C of upper temperature margin.

Q: What is AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. The SS1FL4HM3/H carries this qualification, indicating it meets automotive reliability and quality requirements. The SS34L R3G does not specify this qualification.

Q: Can I use the SS1FL4HM3/H in a 3 A circuit if I derate it?

A: No. Component derating does not change the absolute maximum current rating. The SS1FL4HM3/H is rated for 1 A maximum average rectified current. Operating it at higher currents violates the component specification and may result in thermal failure or reduced reliability.

Q: Are both parts RoHS compliant?

A: Yes. Both the SS34L R3G and SS1FL4HM3/H are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), indicating compatibility with standard lead-free manufacturing processes.

Q: What is the forward voltage drop at the rated current of each part?

A: Both parts specify a maximum forward voltage of 500 mV. For the SS34L R3G, this is measured at 3 A. For the SS1FL4HM3/H, this is measured at 1 A. Forward voltage characteristics may differ at intermediate current levels due to different die designs.