SS34L RHG Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34L RHG is an active 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 designed for fast recovery applications requiring low forward voltage drop characteristics. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part number becomes unavailable or when specific inventory requirements necessitate alternative manufacturers or package configurations.

Substiute Parts

SS34L RHG

Taiwan Semiconductor CorporationIn Stock: 967SS34L RHG 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 RHG is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating Compatibility: The substitute part must maintain the 40V DC reverse voltage specification to ensure safe operation within the same circuit design envelope.

Package Compatibility: Both the main part and substitute must use the DO-219AB package format to ensure mechanical fit and thermal characteristics remain consistent with the original design.

Technology Class: Schottky diode technology must be maintained to preserve the fast recovery characteristics and low forward voltage drop performance.

Mounting Configuration: Surface mount technology is required for both parts to maintain assembly process compatibility.

Temperature Range: Operating junction temperature specifications must support the application's thermal requirements.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status must be maintained for supply chain and regulatory consistency.

The SS1FL4HM3/H from Vishay General Semiconductor meets these substitution criteria with the following consideration: the current rating is reduced from 3A to 1A, which restricts its application to circuits designed for 1A maximum operation.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (SS34L RHG): Recommended for applications requiring the full 3A current rating. This part maintains active product status with Taiwan Semiconductor Corporation and provides the specified performance envelope across the -55°C to 125°C junction temperature range. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

Substitute Part (SS1FL4HM3/H): The Vishay SS1FL4HM3/H is suitable for applications where the circuit design operates at or below 1A average rectified current. This part offers extended junction temperature capability to 150°C and reduced reverse leakage current (200 µA versus 500 µA). Automotive grade qualification and AEC-Q101 certification provide additional reliability documentation. Both parts share identical voltage ratings, package format, and fast recovery characteristics.

Compliance Considerations: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring supply chain continuity and regulatory requirement satisfaction. Moisture sensitivity level 1 (unlimited) on both parts eliminates moisture-related handling constraints.

Frequently Asked Questions (FAQ)

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

A: Direct replacement is limited to circuit designs operating at 1A or below. The SS1FL4HM3/H current rating of 1A is lower than the SS34L RHG rating of 3A. Applications requiring the full 3A capability must use the original SS34L RHG or identify alternative 3A-rated Schottky diodes in the DO-219AB package.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-219AB package format, which ensures mechanical compatibility for PCB assembly and thermal performance characteristics. The Sub SMA designation for the SS34L RHG and the DO-219AB (SMF) designation for the SS1FL4HM3/H refer to the same physical package standard.

Q: What is the significance of the lower reverse leakage current in the SS1FL4HM3/H?

A: The SS1FL4HM3/H exhibits 200 µA reverse leakage at 40V compared to 500 µA for the SS34L RHG. Lower reverse leakage reduces standby power consumption and heat generation in applications with sustained reverse bias conditions. This parameter difference does not affect forward conduction performance.

Q: Does the extended temperature range of the SS1FL4HM3/H provide additional design margin?

A: The SS1FL4HM3/H operates to 150°C junction temperature versus 125°C for the SS34L RHG. This extended range provides additional thermal margin in high-temperature environments but does not alter electrical performance within the overlapping temperature range of -55°C to 125°C.

Q: Are there any supply chain advantages to using the SS1FL4HM3/H?

A: The SS1FL4HM3/H maintains significantly higher inventory availability (33,182 pieces) compared to the SS34L RHG (921 pieces). However, substitution is only appropriate when current requirements do not exceed 1A.

Q: What certifications differentiate the SS1FL4HM3/H?

A: The SS1FL4HM3/H carries automotive grade qualification and AEC-Q101 certification, indicating compliance with automotive reliability standards. The SS34L RHG does not list these certifications. Automotive applications requiring these qualifications must specify the Vishay part.

Q: Do both parts meet the same regulatory requirements?

A: Both parts are ROHS3 compliant and REACH unaffected, satisfying equivalent regulatory requirements for environmental and hazardous substance restrictions. Both maintain MSL 1 (unlimited) moisture sensitivity classification.