SS34LHRFG Equivalent & Substitute Parts

Part Overview

The SS34LHRFG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 3A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Substiute Parts

SS34LHRFG

Taiwan Semiconductor CorporationIn Stock: 732SS34LHRFG 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 SS34LHRFG is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Technology classification: Schottky diode
• Voltage rating: 40V DC reverse voltage (Vr) maximum
• Package type: DO-219AB surface mount configuration
• Automotive grade qualification: AEC-Q101 certification
• RoHS compliance: ROHS3 status
• Operating temperature range: -55°C to 125°C minimum (substitute may exceed this range)
• Forward voltage characteristic: 500 mV maximum at rated current
• Fast recovery speed: ≤ 500ns for currents > 200mA

Current Rating Consideration: The SS34LHRFG is rated for 3A average rectified current. Substitute parts with lower current ratings (such as 1A) operate within the same voltage and package specifications but are limited to reduced current applications. Such substitutes are valid only when circuit design permits operation at the lower current specification.

Parameter Comparison

Engineering Selection Recommendations

SS1FL4HM3/H Substitution Criteria:

The SS1FL4HM3/H from Vishay General Semiconductor - Diodes Division is a valid substitute for the SS34LHRFG under the following conditions:

1. Voltage Compatibility: Both parts are rated for 40V DC reverse voltage. Circuits designed for 40V operation are electrically compatible.

2. Package Compatibility: Both components use the DO-219AB surface mount package. PCB footprints and assembly processes are identical.

3. Automotive Qualification: Both parts carry AEC-Q101 certification and Automotive grade classification, meeting automotive reliability and qualification standards.

4. Compliance Status: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory compliance.

5. Current Rating Limitation: The SS1FL4HM3/H is rated for 1A average rectified current, compared to 3A for the SS34LHRFG. Substitution is valid only when circuit current requirements do not exceed 1A.

6. Reverse Leakage: The SS1FL4HM3/H exhibits lower reverse leakage (200 µA @ 40V) compared to the main part (500 µA @ 40V), representing improved performance in this parameter.

7. Temperature Range: The SS1FL4HM3/H supports an extended operating temperature range (-55°C to 150°C) compared to the main part (-55°C to 125°C), providing additional thermal margin.

8. Product Status: Both parts are Active status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H replace the SS34LHRFG in all applications?

A: The SS1FL4HM3/H is a valid substitute only when circuit design permits operation at 1A or lower average rectified current. Applications requiring the full 3A rating of the SS34LHRFG cannot use the SS1FL4HM3/H as a direct replacement.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-219AB surface mount package. PCB footprints, land patterns, and assembly processes are mechanically compatible.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the SS34LHRFG and SS1FL4HM3/H carry AEC-Q101 qualification and Automotive grade classification, meeting automotive reliability standards.

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

A: The SS34LHRFG exhibits 500 µA reverse leakage at 40V, while the SS1FL4HM3/H exhibits 200 µA at 40V. The substitute part demonstrates lower leakage characteristics.

Q: Are there temperature range differences?

A: The SS34LHRFG operates from -55°C to 125°C junction temperature. The SS1FL4HM3/H extends this range to -55°C to 150°C, providing additional thermal operating margin.

Q: Do both parts have the same forward voltage drop?

A: Both parts are specified at 500 mV maximum forward voltage. However, this specification is measured at different current levels: 3A for the SS34LHRFG and 1A for the SS1FL4HM3/H. Forward voltage characteristics vary with current, so direct comparison at identical current levels is not provided in the specifications.

Q: What is the RoHS and REACH compliance status?

A: Both parts are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements.

Q: Can the SS1FL4HM3/H be used in high-current rectification circuits?

A: No. The SS1FL4HM3/H is limited to 1A average rectified current. High-current applications requiring 3A operation require the SS34LHRFG or equivalent 3A-rated Schottky diodes in DO-219AB packaging.