SS34LHM2G Equivalent & Substitute Parts

Part Overview

The SS34LHM2G is an automotive-grade Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates at 40V DC reverse voltage with a 3A average rectified current rating. The device is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the defined parameter envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Technology	Schottky	—
Package / Case	DO-219AB	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS34LHM2G is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40V minimum
Package / Case: DO-219AB (mechanical compatibility)
Mounting Type: Surface Mount
Technology: Schottky
Grade: Automotive
Qualification: AEC-Q101

Allowable Variation Parameters:

Current - Average Rectified (Io): Equal or greater than 3A
Voltage - Forward (Vf) (Max): Equal or less than 500 mV @ rated current
Current - Reverse Leakage @ Vr: Equal or less than 500 µA @ 40V
Operating Temperature - Junction: Equal or greater than -55°C to 125°C range

The SS1FL4HM3/H is identified as a substitute part; however, its Current - Average Rectified (Io) rating of 1A is below the 3A requirement of the main part. This part does not meet the substitution criteria for applications requiring the full 3A current capacity.

Parameter Comparison

Parameter	SS34LHM2G (Main Part)	SS1FL4HM3/H (Listed Substitute)	Match Status
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	Match
Current - Average Rectified (Io)	3 A	1 A	Below Requirement
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	500 mV @ 1 A	Match at Rated Current
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Match
Current - Reverse Leakage @ Vr	500 µA @ 40 V	200 µA @ 40 V	Better Performance
Technology	Schottky	Schottky	Match
Package / Case	DO-219AB	DO-219AB	Match
Mounting Type	Surface Mount	Surface Mount	Match
Grade	Automotive	Automotive	Match
Qualification	AEC-Q101	AEC-Q101	Match
Operating Temperature - Junction	-55 to 125 °C	-55 to 150 °C	Better Performance
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Match

Engineering Selection Recommendations

SS34LHM2G (Primary Part): The SS34LHM2G remains the specified component for applications requiring 3A average rectified current at 40V reverse voltage. This part is Active product status with full AEC-Q101 automotive qualification and ROHS3 compliance. The device is suitable for automotive rectification circuits where the 3A current capacity is a functional requirement.

SS1FL4HM3/H (Listed Substitute - Limited Applicability): The SS1FL4HM3/H shares identical voltage ratings, package configuration, and automotive qualification with the main part. However, the 1A current rating is insufficient for direct substitution in circuits designed for 3A operation. This part is applicable only in applications where the circuit current requirement does not exceed 1A. Both parts maintain AEC-Q101 qualification and ROHS3 compliance, ensuring regulatory alignment in automotive applications.

Selection Criteria:

Use SS34LHM2G when circuit design requires 3A average rectified current capacity
Use SS1FL4HM3/H only when circuit current requirements are 1A or below
Both parts are suitable for automotive-grade applications with identical operating temperature minimums of -55°C
Verify circuit current requirements before selecting either part

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H replace the SS34LHM2G in all applications?

A: No. The SS1FL4HM3/H has a maximum average rectified current of 1A, while the SS34LHM2G is rated for 3A. Substitution is valid only for circuits where the actual current requirement does not exceed 1A.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-219AB package configuration for surface mount applications. Mechanical compatibility is confirmed for PCB layout and assembly processes.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the SS34LHM2G and SS1FL4HM3/H carry AEC-Q101 automotive qualification and are ROHS3 compliant, meeting automotive industry standards.

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

A: The SS34LHM2G specifies 500 µA reverse leakage at 40V, while the SS1FL4HM3/H specifies 200 µA at 40V. The SS1FL4HM3/H exhibits lower reverse leakage, which may be advantageous in low-leakage applications.

Q: Can the SS34LHM2G operate at higher temperatures than the SS1FL4HM3/H?

A: No. The SS34LHM2G operates to a maximum junction temperature of 125°C, while the SS1FL4HM3/H operates to 150°C. The SS1FL4HM3/H has a higher temperature rating.

Q: Are there any differences in forward voltage drop between these parts?

A: Both parts specify 500 mV maximum forward voltage drop at their respective rated currents (3A for SS34LHM2G, 1A for SS1FL4HM3/H). Forward voltage characteristics are comparable at equivalent current densities.

Q: What is the moisture sensitivity level for both parts?

A: Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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