SS34L RUG Equivalent & Substitute Parts

Part Overview

The SS34L RUG 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 across standard storage and assembly environments.

Identification of equivalent and substitute parts becomes necessary when managing supply chain continuity, addressing component obsolescence, or accommodating design flexibility across manufacturing locations. Substitute components must maintain electrical compatibility within the specified voltage and current parameters while conforming to the same or superior mechanical packaging standards.

Substiute Parts

SS34L RUG

Taiwan Semiconductor CorporationIn Stock: 970SS34L RUG Datasheet

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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 RUG is permissible only when the replacement component satisfies the following mandatory electrical and mechanical criteria:

Voltage Compatibility: The substitute must maintain a maximum reverse voltage (Vr) rating equal to or greater than 40 V to ensure safe operation within the circuit design envelope.

Current Rating: The substitute must support an average rectified current (Io) equal to or greater than 3 A to fulfill the load requirements of the application.

Forward Voltage Characteristics: The substitute must exhibit forward voltage (Vf) characteristics at or below 500 mV at the specified current level to maintain circuit efficiency and thermal performance.

Recovery Speed: The substitute must demonstrate fast recovery characteristics consistent with the original specification (≤ 500ns for currents > 200mA) to preserve switching performance in high-frequency applications.

Package Compatibility: The substitute must utilize the DO-219AB package format to ensure mechanical and thermal compatibility with existing printed circuit board layouts and assembly processes.

Compliance Standards: The substitute must maintain ROHS3 compliance and unlimited moisture sensitivity classification (MSL 1) to satisfy regulatory and manufacturing requirements.

The SS1FL4HM3/H manufactured by Vishay General Semiconductor - Diodes Division meets these substitution criteria with the exception of current rating, which is specified at 1 A rather than 3 A. This component is therefore suitable only for applications where the circuit current demand does not exceed 1 A.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (Full Current Capacity Required): The SS34L RUG remains the specified component when the application circuit requires the full 3 A average rectified current capacity. No equivalent substitute meeting all electrical parameters at this current level is provided in the available substitute list.

For Current-Limited Applications (≤ 1 A): The SS1FL4HM3/H manufactured by Vishay General Semiconductor - Diodes Division is suitable for applications where the circuit current demand does not exceed 1 A. This substitute provides equivalent reverse voltage rating, identical fast recovery speed characteristics, and identical package format. The Vishay component offers additional advantages including lower reverse leakage current (200 µA versus 500 µA), extended operating temperature range (-55 to 150°C versus -55 to 125°C), and AEC-Q101 automotive qualification.

Compliance Considerations: Both components maintain ROHS3 compliance, unlimited moisture sensitivity classification (MSL 1), and REACH unaffected status, satisfying regulatory requirements for commercial and industrial applications.

Thermal Performance: The Vishay SS1FL4HM3/H demonstrates superior reverse leakage characteristics, resulting in reduced thermal dissipation at maximum reverse voltage conditions. This characteristic is beneficial in applications operating at elevated ambient temperatures or with thermal constraints.

Frequently Asked Questions (FAQ)

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

A: The SS1FL4HM3/H is suitable only for applications where the circuit current demand does not exceed 1 A. The Vishay component is rated for 1 A average rectified current, while the Taiwan Semiconductor SS34L RUG is rated for 3 A. Direct substitution in circuits requiring 3 A operation will result in component overstress and potential failure.

Q: Are the package formats identical between these components?

A: Yes. Both the SS34L RUG and SS1FL4HM3/H utilize the DO-219AB package format, ensuring mechanical and thermal compatibility with existing printed circuit board layouts and surface mount assembly processes.

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

A: The SS34L RUG exhibits reverse leakage of 500 µA at 40 V, while the SS1FL4HM3/H exhibits 200 µA at 40 V. The lower leakage current in the Vishay component reduces thermal dissipation and improves circuit efficiency in applications operating at maximum reverse voltage.

Q: Does the Vishay SS1FL4HM3/H offer any performance advantages over the Taiwan Semiconductor SS34L RUG?

A: The Vishay component provides three specific advantages: lower reverse leakage current (200 µA versus 500 µA), extended operating temperature range (150°C maximum junction temperature versus 125°C), and AEC-Q101 automotive qualification. These characteristics make the Vishay component suitable for automotive and high-temperature applications where the 1 A current rating is sufficient.

Q: Are both components RoHS compliant?

A: Yes. Both the SS34L RUG and SS1FL4HM3/H are ROHS3 compliant and carry unlimited moisture sensitivity classification (MSL 1), satisfying regulatory requirements for commercial, industrial, and automotive applications.

Q: What is the primary limitation of using the SS1FL4HM3/H as a substitute?

A: The primary limitation is the reduced current rating. The SS1FL4HM3/H is rated for 1 A average rectified current, compared to 3 A for the SS34L RUG. Substitution is permissible only in applications where the circuit current demand does not exceed 1 A.

Q: Do both components exhibit identical fast recovery characteristics?

A: Yes. Both components meet the fast recovery specification of ≤ 500ns for currents exceeding 200mA, ensuring equivalent switching performance in high-frequency applications within the current rating limits of each component.