SS34LHMQG Equivalent & Substitute Parts

Part Overview

The SS34LHMQG is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 3 A average rectified current in a Sub SMA surface mount package. This component is qualified to AEC-Q101 automotive standards and maintains RoHS3 compliance. Substitute parts are identified based on matching electrical specifications and package compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Technology	Schottky
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 ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Package / Case	DO-219AB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SS34LHMQG is determined by the following critical parameters:

Electrical Compatibility:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Technology: Schottky diode
Fast Recovery characteristic: ≤ 500 ns, > 200 mA (Io)
Package / Case: DO-219AB

Mechanical Compatibility:

Mounting Type: Surface Mount
Supplier Device Package: Sub SMA or DO-219AB (SMF)

Compliance & Qualification:

Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant

The SS1FL4HM3/H qualifies as a substitute based on matching voltage rating, Schottky technology, fast recovery speed, DO-219AB package compatibility, automotive grade, AEC-Q101 qualification, and RoHS3 compliance. Current rating differences (1 A vs. 3 A) and reverse leakage variations are noted for application-specific evaluation.

Parameter Comparison

Parameter	SS34LHMQG (Main Part)	SS1FL4HM3/H (Substitute)
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
Technology	Schottky	Schottky
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 ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	200 µA @ 40 V
Package / Case	DO-219AB	DO-219AB
Supplier Device Package	Sub SMA	DO-219AB (SMF)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active

Engineering Selection Recommendations

SS34LHMQG (Primary Part): Select this part for applications requiring 3 A average rectified current at 40 V reverse voltage. The component is active, AEC-Q101 qualified, and ROHS3 compliant, suitable for automotive Schottky rectifier applications with full-rated current demand.

SS1FL4HM3/H (Substitute Part): This part is suitable for applications where current requirements do not exceed 1 A at 40 V reverse voltage. The substitute maintains identical voltage rating, Schottky technology, fast recovery speed, DO-219AB package compatibility, automotive grade, AEC-Q101 qualification, and RoHS3 compliance. The substitute offers lower reverse leakage current (200 µA vs. 500 µA) and extended operating temperature range (-55°C ~ 150°C vs. -55°C ~ 125°C). Both parts are active products with unlimited moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can SS1FL4HM3/H replace SS34LHMQG in all applications?

A: Substitution is valid only for applications where the average rectified current requirement does not exceed 1 A. The SS34LHMQG is rated for 3 A, while the SS1FL4HM3/H is rated for 1 A. Both parts share identical 40 V reverse voltage rating, Schottky technology, fast recovery speed, and DO-219AB package compatibility.

Q: Are the packages physically compatible?

A: Both parts use the DO-219AB package for surface mount applications. The SS34LHMQG is supplied as Sub SMA, while the SS1FL4HM3/H is supplied as DO-219AB (SMF). Both designations refer to the same physical package footprint and are mechanically compatible on PCB layouts.

Q: What are the compliance differences between these parts?

A: Both parts are AEC-Q101 qualified for automotive applications, ROHS3 compliant, and carry MSL 1 (Unlimited) moisture sensitivity level. No compliance differences exist between the two parts.

Q: How do the reverse leakage characteristics differ?

A: The SS34LHMQG exhibits 500 µA reverse leakage at 40 V, while the SS1FL4HM3/H exhibits 200 µA reverse leakage at 40 V. The substitute part has lower reverse leakage current.

Q: What is the temperature operating range difference?

A: The SS34LHMQG operates from -55°C to 125°C junction temperature. The SS1FL4HM3/H operates from -55°C to 150°C junction temperature, providing a 25°C higher upper temperature limit.

Q: Are both parts currently available?

A: Both parts are active products. The SS34LHMQG has 976 pieces in stock, and the SS1FL4HM3/H has 33,182 pieces in stock as new original inventory.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message