SS310LHMQG Equivalent & Substitute Parts

Part Overview

The SS310LHMQG is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 3 A average rectified current in a Sub SMA surface mount package. This component is classified as Active product status and carries AEC-Q101 automotive qualification with ROHS3 compliance.

Substitute parts become necessary when the primary part number reaches end-of-life status, experiences supply constraints, or when design requirements permit operation with alternative electrical characteristics within specified tolerances. The SS310LHMQG has documented substitute options that maintain electrical compatibility while offering different current ratings or packaging configurations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 100 V
Package / Case	DO-219AB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the SS310LHMQG is based on the following critical parameters that must remain constant or within acceptable operating margins:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V
Package / Case: DO-219AB (Sub SMA)
Mounting Type: Surface Mount
Technology: Schottky
Fast Recovery characteristic (≤ 500ns, > 200mA)

Allowable Variation Parameters:

Current - Average Rectified (Io): Substitute parts may have lower current ratings (1 A or 2 A) when circuit design permits operation below the 3 A maximum
Voltage - Forward (Vf): Minor variations acceptable within the 800–860 mV range at respective current ratings
Current - Reverse Leakage: Lower leakage values (5 µA) are acceptable as they represent improved performance
Operating Temperature - Junction: Extended upper temperature limits (175°C vs. 150°C) are acceptable
Reverse Leakage Test Voltage: Variations in test voltage (10 V vs. 100 V) do not affect substitution eligibility

Substitute Categories:

Parametric Equivalent (Same Current Rating): SS310L maintains identical 3 A current rating with matching electrical specifications but carries "Not For New Designs" status.
Similar Parts (Lower Current Ratings): SS1FH10-M3/H, SS1FH10HM3/H, SS2FH10-M3/H, and SS2FH10HM3/H are Vishay eSMP® series diodes with 1 A or 2 A ratings. These substitute when circuit current requirements do not exceed their respective ratings and when the 100 V reverse voltage requirement is maintained.

Parameter Comparison

Parameter	SS310LHMQG (Main)	SS310L	SS1FH10-M3/H	SS1FH10HM3/H	SS2FH10-M3/H	SS2FH10HM3/H
Manufacturer	Taiwan Semiconductor	Taiwan Semiconductor	Vishay	Vishay	Vishay	Vishay
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	3 A	3 A	1 A	1 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	850 mV @ 3 A	800 mV @ 1 A	800 mV @ 1 A	860 mV @ 2 A	860 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	100 µA @ 100 V	100 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 10 V	5 µA @ 100 V
Package / Case	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB	DO-219AB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Grade	Automotive	—	—	Automotive	—	Automotive
Qualification	AEC-Q101	—	—	AEC-Q101	—	AEC-Q101
Product Status	Active	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SS310L (Parametric Equivalent): SS310L is a direct parametric equivalent with identical electrical specifications and 3 A current rating. However, this part carries "Not For New Designs" status, indicating manufacturer discontinuation trajectory. Selection of SS310L is appropriate only for sustaining production of existing designs or when supply of the primary SS310LHMQG is unavailable. New design implementations should not incorporate SS310L.

SS1FH10-M3/H and SS1FH10HM3/H (1 A Alternatives): These Vishay eSMP® series diodes are suitable substitutes when circuit design permits operation at 1 A maximum current. Both parts maintain 100 V reverse voltage rating and DO-219AB packaging. SS1FH10HM3/H carries AEC-Q101 automotive qualification matching the primary part. SS1FH10-M3/H lacks automotive grade designation. Both offer extended operating temperature range (-55 to 175°C) and lower reverse leakage (5 µA). Selection between these two depends on automotive qualification requirements.

SS2FH10-M3/H and SS2FH10HM3/H (2 A Alternatives): These Vishay eSMP® series diodes are suitable substitutes when circuit design permits operation at 2 A maximum current. Both maintain 100 V reverse voltage rating and DO-219AB packaging. SS2FH10HM3/H carries AEC-Q101 automotive qualification and Automotive grade designation, providing full compliance equivalence to the primary part. SS2FH10-M3/H lacks automotive grade designation. Both offer extended operating temperature range and lower reverse leakage. For automotive applications, SS2FH10HM3/H is the preferred 2 A substitute.

Selection Priority for Active Designs:

SS310LHMQG (primary specification)
SS2FH10HM3/H (if 2 A current rating is acceptable and automotive qualification is required)
SS1FH10HM3/H (if 1 A current rating is acceptable and automotive qualification is required)

Frequently Asked Questions (FAQ)

Q: Can SS310L be used as a direct replacement for SS310LHMQG in new designs?

A: No. While SS310L is a parametric equivalent with identical electrical specifications, it carries "Not For New Designs" status. This designation indicates the manufacturer does not recommend this part for new product development. SS310L is appropriate only for sustaining existing production or temporary supply solutions.

Q: What is the primary difference between the Vishay eSMP® series substitutes and the Taiwan Semiconductor main part?

A: The Vishay eSMP® series substitutes (SS1FH10 and SS2FH10 families) have lower current ratings (1 A or 2 A) compared to the 3 A rating of SS310LHMQG. All other electrical parameters—100 V reverse voltage, fast recovery switching, DO-219AB packaging, and Schottky technology—remain compatible. Substitution is valid only when circuit current requirements do not exceed the substitute part's rating.

Q: Are the Vishay substitutes suitable for automotive applications?

A: SS1FH10HM3/H and SS2FH10HM3/H carry AEC-Q101 automotive qualification and Automotive grade designation, making them suitable for automotive applications. SS1FH10-M3/H and SS2FH10-M3/H lack automotive grade designation and are not qualified for automotive use. Part selection must match application requirements.

Q: What is the significance of the reverse leakage current difference between the main part and substitutes?

A: The main part SS310LHMQG specifies 100 µA reverse leakage at 100 V, while Vishay substitutes specify 5 µA. Lower reverse leakage represents improved performance and does not create compatibility issues. Circuits designed for the higher leakage specification of the main part will operate satisfactorily with the lower leakage of substitute parts.

Q: Can I use a 1 A substitute (SS1FH10) in place of the 3 A rated SS310LHMQG?

A: Substitution is valid only if circuit design analysis confirms that maximum forward current does not exceed 1 A under any operating condition, including transient events and worst-case scenarios. The 100 V reverse voltage rating and fast recovery characteristics are maintained. If circuit current requirements exceed 1 A, use of a 1 A substitute creates risk of component failure.

Q: What packaging options are available among the substitute parts?

A: All substitute parts use DO-219AB (Sub SMA) surface mount packaging, matching the primary part. Packaging variations exist in tape configuration: SS310L is supplied in Tape & Reel (TR), SS1FH10-M3/H and SS2FH10-M3/H are supplied in Cut Tape (CT) & Digi-Reel®, and SS1FH10HM3/H and SS2FH10HM3/H are supplied in Tape & Reel (TR). These variations do not affect electrical compatibility but may impact procurement and assembly processes.

Q: Is the extended operating temperature range of Vishay substitutes (-55 to 175°C vs. -55 to 150°C) a concern?

A: No. The extended upper temperature limit of Vishay parts (175°C) is superior to the main part specification (150°C). Circuits designed for the main part's 150°C maximum junction temperature will operate within safe margins with substitute parts rated to 175°C. This represents improved thermal performance.

Q: What compliance certifications are maintained across all substitute options?

A: All parts maintain ROHS3 compliance and REACH Unaffected status. AEC-Q101 automotive qualification is present on SS310LHMQG, SS310L, SS1FH10HM3/H, and SS2FH10HM3/H. Automotive grade designation is present on SS310LHMQG, SS1FH10HM3/H, and SS2FH10HM3/H. Selection must account for specific compliance requirements of the application.

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