SS34LHMHG Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34LHMHG is an automotive-grade Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the Sub SMA package format. This component operates at 40V reverse voltage with a 3A average rectified current rating and features fast recovery characteristics suitable for high-frequency switching applications. The part maintains Active product status with full AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified to address inventory availability, extended temperature range requirements, or alternative packaging preferences while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

SS34LHMHG

Taiwan Semiconductor CorporationIn Stock: 1111SS34LHMHG Datasheet

Current PartRFQ

SS1FL4HM3/H

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SS34LHMHG are identified based on strict electrical and mechanical parameter alignment within the Schottky diode rectifier category. The substitution logic is governed by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must maintain the 40V DC reverse voltage (Vr) maximum specification to ensure safe operation within the same circuit voltage domain.

Package and Mounting Compatibility: Substitute parts must utilize the DO-219AB package format with surface mount technology to ensure mechanical fit and assembly compatibility with existing PCB designs.

Technology Classification: All substitutes employ Schottky diode technology with fast recovery characteristics (≤ 500ns, > 200mA) to maintain switching performance requirements.

Automotive Grade and Certification: Substitute parts must carry automotive-grade classification with AEC-Q101 qualification to meet reliability and quality standards for automotive applications.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory requirements.

Current Rating Consideration: While the primary part specifies 3A average rectified current, substitute parts with lower current ratings (1A) are listed as electrical substitutes when all other parameters align, as they operate within the same voltage and package specifications. Circuit design must verify that the lower current rating does not exceed application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (SS34LHMHG): The SS34LHMHG remains the preferred selection for applications requiring the full 3A average rectified current specification. This part carries Active product status with established automotive qualification and maintains standard operating temperature range (-55°C to 125°C) suitable for most automotive thermal environments. Taiwan Semiconductor Corporation manufacturing provides established supply chain presence with 1089 units in current inventory.

Substitute Part Selection (SS1FL4HM3/H): The SS1FL4HM3/H from Vishay General Semiconductor qualifies as an electrical substitute when circuit design permits operation at 1A average rectified current. This substitute offers two distinct advantages: extended operating temperature range to 150°C for high-temperature applications, and lower reverse leakage current (200 µA versus 500 µA), which may benefit low-power standby scenarios. Both parts maintain identical 40V voltage rating, DO-219AB package format, and AEC-Q101 automotive qualification. The substitute carries significantly higher inventory availability (33182 units) and is supplied in Tape & Reel packaging format.

Compliance Verification: Both parts satisfy ROHS3 compliance, REACH unaffected status, and automotive-grade requirements. Selection between these parts depends solely on current rating requirements and operating temperature specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H substitute directly replace the SS34LHMHG in all applications?

A: Direct substitution is limited by current rating. The SS1FL4HM3/H is rated for 1A average rectified current, while the SS34LHMHG is rated for 3A. Substitution is valid only when circuit design confirms that the diode current does not exceed 1A during normal operation. The 40V voltage rating, DO-219AB package, and fast recovery characteristics are identical between both parts.

Q: What is the difference between Sub SMA and DO-219AB package designations?

A: Sub SMA and DO-219AB refer to equivalent package formats for surface mount Schottky diodes. Both designations describe the same physical package with identical footprint and mounting characteristics. The SS34LHMHG uses the Sub SMA designation while the SS1FL4HM3/H uses the DO-219AB (SMF) designation; both are mechanically compatible.

Q: Does the extended temperature range of the SS1FL4HM3/H affect substitution suitability?

A: The extended temperature range (-55°C to 150°C for the substitute versus -55°C to 125°C for the main part) represents an advantage for high-temperature applications. This extended range does not prevent substitution; it only expands the operating envelope. Applications operating within the standard -55°C to 125°C range experience no thermal performance difference.

Q: How do the reverse leakage current specifications compare?

A: The SS34LHMHG specifies 500 µA reverse leakage at 40V, while the SS1FL4HM3/H specifies 200 µA at the same voltage. The lower leakage of the substitute part represents improved performance characteristics and does not prevent substitution. Applications sensitive to leakage current may benefit from the substitute's lower specification.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SS34LHMHG and SS1FL4HM3/H carry automotive-grade classification with AEC-Q101 qualification. Both maintain ROHS3 compliance and REACH unaffected status, satisfying automotive regulatory requirements.

Q: What packaging format differences exist between these parts?

A: The SS34LHMHG is supplied in standard packaging format, while the SS1FL4HM3/H is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume automated assembly operations and does not affect electrical performance or mechanical compatibility.