SS34L RFG Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34L RFG 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, making it suitable for standard industrial and commercial 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 RFG

Taiwan Semiconductor CorporationIn Stock: 931SS34L RFG 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 RFG is permissible with the SS1FL4HM3/H based on the following electrical and mechanical compatibility criteria:

Matching Parameters:

• Reverse voltage rating: Both parts rated at 40 V maximum
• Package format: Both use DO-219AB surface mount package
• Technology: Both employ Schottky rectifier technology
• Fast recovery speed: Both meet ≤ 500ns specification for > 200mA operation
• RoHS compliance: Both are ROHS3 compliant
• Moisture sensitivity: Both classified as MSL 1 (Unlimited)

Substitution Constraint: The SS1FL4HM3/H carries a maximum average rectified current rating of 1 A, compared to the 3 A rating of the SS34L RFG. This substitute part is suitable only in applications where the circuit current requirement does not exceed 1 A. The substitute part provides additional benefits including automotive-grade qualification (AEC-Q101) and an extended maximum junction temperature of 150°C versus 125°C for the main part.

Parameter Comparison

Engineering Selection Recommendations

SS34L RFG Selection Criteria: Select the SS34L RFG when circuit design requires a 3 A average rectified current capacity at 40 V reverse voltage. This part is appropriate for general industrial and commercial applications requiring standard temperature range operation (-55°C to 125°C junction temperature).

SS1FL4HM3/H Selection Criteria: Select the SS1FL4HM3/H substitute when the application circuit current requirement does not exceed 1 A at 40 V reverse voltage. This substitute part is specifically appropriate for automotive applications requiring AEC-Q101 qualification or for designs requiring extended maximum junction temperature operation up to 150°C. The lower reverse leakage current (200 µA versus 500 µA) may provide additional performance benefits in low-leakage applications.

Both parts maintain identical package geometry (DO-219AB), surface mount compatibility, and fast recovery speed characteristics, ensuring direct mechanical and electrical interchangeability within the specified current constraints.

Frequently Asked Questions (FAQ)

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

A: Direct replacement is permissible only in applications where the circuit current requirement does not exceed 1 A. The SS1FL4HM3/H is rated for 1 A average rectified current, while the SS34L RFG is rated for 3 A. Applications requiring current levels between 1 A and 3 A must use the SS34L RFG or identify alternative parts with higher current ratings.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-219AB surface mount package format. The mechanical footprint and land pattern are identical, permitting direct substitution from a PCB layout perspective.

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

A: The SS34L RFG exhibits 500 µA reverse leakage at 40 V, while the SS1FL4HM3/H exhibits 200 µA reverse leakage at 40 V. The lower leakage current of the substitute part may provide performance advantages in applications sensitive to leakage current effects.

Q: Does the SS1FL4HM3/H offer any additional certifications?

A: The SS1FL4HM3/H carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. The SS34L RFG does not carry this certification.

Q: What is the maximum junction temperature difference between these parts?

A: The SS34L RFG operates to a maximum junction temperature of 125°C, while the SS1FL4HM3/H operates to 150°C. Applications requiring extended temperature range operation benefit from the substitute part's higher temperature rating.

Q: Are both parts RoHS compliant?

A: Both the SS34L RFG and SS1FL4HM3/H are ROHS3 compliant and carry unlimited moisture sensitivity classification (MSL 1), meeting standard environmental and reliability requirements.