SS34LHRTG Equivalent & Substitute Parts

Part Overview

The SS34LHRTG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 3 A average rectified current. This component is designed for surface mount applications in the Sub SMA package format and carries automotive-grade qualification under AEC-Q101. The part is currently active in production with 786 pieces in stock inventory.

Equivalent and substitute parts are identified when alternative components meet the same electrical specifications and mechanical compatibility requirements, enabling procurement flexibility and supply chain continuity for applications requiring 40 V, 3 A Schottky rectification.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
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°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SS34LHRTG is determined by the following critical parameters:

Voltage Rating: The substitute part must support a minimum DC reverse voltage (Vr) of 40 V to maintain circuit protection and reliability margins.

Current Rating: The substitute part must support the required average rectified current (Io). The SS34LHRTG is rated for 3 A operation.

Package Compatibility: The substitute part must use the DO-219AB package format to ensure mechanical fit and thermal performance in the target application.

Technology: Schottky diode technology is required to maintain fast recovery characteristics and forward voltage performance.

Automotive Qualification: AEC-Q101 qualification is required for automotive-grade applications.

Compliance Standards: RoHS3 compliance and REACH unaffected status must be maintained.

The identified substitute part SS1FL4HM3/H meets the voltage rating (40 V) and package requirements (DO-219AB) but operates at a reduced current rating of 1 A, which is below the 3 A requirement of the main part. This part is therefore suitable only for applications where the actual circuit current demand does not exceed 1 A.

Parameter Comparison

Parameter	SS34LHRTG (Main Part)	SS1FL4HM3/H (Substitute)
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	40 V	40 V
Current - Average Rectified (Io)	3 A	1 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	500 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	200 µA @ 40 V
Technology	Schottky	Schottky
Package / Case	DO-219AB	DO-219AB
Mounting Type	Surface Mount	Surface Mount
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection: The SS34LHRTG remains the appropriate choice for applications requiring 3 A average rectified current at 40 V reverse voltage with automotive-grade AEC-Q101 qualification.

Substitute Consideration: The SS1FL4HM3/H is suitable as a substitute only in applications where the actual circuit current requirement does not exceed 1 A. Both parts share identical voltage ratings (40 V), package format (DO-219AB), technology (Schottky), and automotive qualification (AEC-Q101). The SS1FL4HM3/H offers an extended operating temperature range (-55°C ~ 150°C versus -55°C ~ 125°C) and lower reverse leakage current (200 µA versus 500 µA at 40 V).

Compliance Alignment: Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating, ensuring regulatory and environmental compatibility in automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H directly replace the SS34LHRTG in all applications?

A: No. The SS1FL4HM3/H is rated for 1 A average rectified current, while the SS34LHRTG is rated for 3 A. Direct substitution is only valid when the actual circuit current demand does not exceed 1 A. Exceeding the current rating of the substitute part will result in component failure.

Q: Are the package formats identical between these parts?

A: Yes. Both the SS34LHRTG and SS1FL4HM3/H use the DO-219AB package format, ensuring mechanical compatibility and identical PCB footprints for surface mount assembly.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both parts carry AEC-Q101 automotive-grade qualification and are suitable for automotive applications requiring Schottky rectification.

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

A: The SS34LHRTG has a reverse leakage current of 500 µA at 40 V, while the SS1FL4HM3/H has 200 µA at 40 V. The lower leakage of the substitute part may provide improved performance in low-current standby conditions.

Q: Are there temperature range differences between these parts?

A: Yes. The SS34LHRTG operates from -55°C to 125°C junction temperature, while the SS1FL4HM3/H operates from -55°C to 150°C. The substitute part supports a higher maximum junction temperature.

Q: Do both parts comply with RoHS and REACH regulations?

A: Yes. Both the SS34LHRTG and SS1FL4HM3/H are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the forward voltage characteristic at rated current for each part?

A: Both parts specify a maximum forward voltage of 500 mV. However, this is measured at different current levels: 500 mV @ 3 A for the SS34LHRTG and 500 mV @ 1 A for the SS1FL4HM3/H.

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