SS3P4LHM3_A/H Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS3P4LHM3_A/H is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount TO-277A (SMPC) package. This component is classified as Active product status and carries automotive-grade qualification under AEC-Q101. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or packaging format preferences while maintaining the same functional specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	470 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	250 µA @ 40 V	µA
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	TO-277, 3-PowerDFN	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS3P4LHM3_A/H is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 470 mV @ 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 250 µA @ 40 V

Mechanical Equivalence Criteria:

Mounting Type: Surface Mount
Package / Case: TO-277, 3-PowerDFN
Operating Temperature - Junction: -55°C to 150°C

Compliance Criteria:

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

Parametric equivalents SS3P4L-M3/86A and SS3P4LHM3_A/I meet all electrical and mechanical criteria with identical ratings. The FSV540 from onsemi is listed as a manufacturer-recommended substitute but operates at 5 A current rating, exceeding the 3 A specification of the primary part and carries a Not For New Designs product status.

Parameter Comparison

Parameter	SS3P4LHM3_A/H	SS3P4L-M3/86A	SS3P4LHM3_A/I	FSV540
Manufacturer	Vishay	Vishay	Vishay	onsemi
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	3 A	3 A	3 A	5 A
Voltage - Forward (Vf) (Max) @ If	470 mV @ 3 A	470 mV @ 3 A	470 mV @ 3 A	520 mV @ 5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	250 µA @ 40 V	250 µA @ 40 V	250 µA @ 40 V	250 µA @ 40 V
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Grade	Automotive	—	Automotive	—
Qualification	AEC-Q101	—	AEC-Q101	—
Product Status	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

SS3P4L-M3/86A and SS3P4LHM3_A/I are direct parametric equivalents to SS3P4LHM3_A/H. Both parts maintain identical electrical specifications across voltage, current, and thermal performance. Both are Active product status. SS3P4LHM3_A/I is available in Cut Tape (CT) and Digi-Reel® packaging formats in addition to Tape & Reel (TR), providing flexibility for different procurement and assembly workflows. SS3P4L-M3/86A is designated as part of the eSMP® series. Selection between these two equivalents depends on packaging format requirements and inventory availability.

Secondary Substitute (Current Rating Variance):

FSV540 from onsemi carries a Not For New Designs product status and is not recommended for new circuit designs. While it shares the same 40 V reverse voltage rating, 40 V package type, and operating temperature range, it is rated for 5 A average rectified current with a forward voltage of 520 mV @ 5 A. This higher current rating and forward voltage represent a departure from the 3 A / 470 mV specification of the primary part. FSV540 lacks automotive-grade designation and AEC-Q101 qualification. Use of FSV540 is restricted to legacy system support or applications where the higher current capability is required and the Not For New Designs status is acceptable.

Compliance Considerations:

All three parametric equivalents (SS3P4LHM3_A/H, SS3P4L-M3/86A, and SS3P4LHM3_A/I) are ROHS3 Compliant with MSL 1 (Unlimited) rating. Automotive applications requiring AEC-Q101 qualification should prioritize SS3P4LHM3_A/H or SS3P4LHM3_A/I, both of which carry explicit automotive-grade designation.

Frequently Asked Questions (FAQ)

Q: Can SS3P4L-M3/86A be used as a direct replacement for SS3P4LHM3_A/H?

A: Yes. SS3P4L-M3/86A is a parametric equivalent with identical electrical specifications: 40 V reverse voltage, 3 A average rectified current, 470 mV forward voltage @ 3 A, and matching thermal performance. Both are Active status and ROHS3 Compliant. The primary difference is series designation (eSMP® for SS3P4L-M3/86A) and packaging format availability. Mechanical compatibility is confirmed through identical TO-277, 3-PowerDFN package specifications.

Q: What is the difference between SS3P4LHM3_A/I and SS3P4LHM3_A/H?

A: Both parts are parametrically equivalent with identical electrical ratings and automotive-grade AEC-Q101 qualification. The primary distinction is packaging format: SS3P4LHM3_A/I is available in Cut Tape (CT) and Digi-Reel® formats, while SS3P4LHM3_A/H is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and procurement preferences.

Q: Why is FSV540 listed as a substitute if it has a higher current rating?

A: FSV540 is listed as a manufacturer-recommended substitute based on shared voltage rating (40 V), package type (TO-277, 3-PowerDFN), and operating temperature range (-55°C to 150°C). However, FSV540 is rated for 5 A average rectified current versus the 3 A specification of SS3P4LHM3_A/H, and carries a Not For New Designs product status. It is not a direct parametric equivalent and should not be used in new designs requiring the 3 A specification.

Q: Are all substitute parts automotive-qualified?

A: SS3P4LHM3_A/H and SS3P4LHM3_A/I both carry automotive-grade designation with AEC-Q101 qualification. SS3P4L-M3/86A does not list automotive-grade or AEC-Q101 qualification in the provided specifications. FSV540 does not carry automotive-grade designation. For automotive applications, use SS3P4LHM3_A/H or SS3P4LHM3_A/I.

Q: What is the significance of the TO-277, 3-PowerDFN package designation?

A: TO-277 and 3-PowerDFN are equivalent designations for the same surface mount package used across all listed parts. This package type ensures mechanical and thermal compatibility for PCB assembly. All substitute parts use this identical package specification, confirming footprint and thermal interface compatibility.

Q: Can these diodes be used interchangeably in high-temperature applications?

A: All listed parts share the same operating temperature range of -55°C to 150°C junction temperature. Within this range, SS3P4LHM3_A/H, SS3P4L-M3/86A, and SS3P4LHM3_A/I are thermally equivalent. FSV540 also operates within this range but carries Not For New Designs status.

Q: What does ROHS3 Compliant status indicate?

A: ROHS3 Compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials in electrical and electronic equipment. All listed parts meet this environmental standard. MSL 1 (Unlimited) rating indicates no moisture sensitivity restrictions during storage and handling.

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