SS3P4LHM3_A/I Schottky Diode 40V 3A TO-277A Equivalent & Substitute Parts

Part Overview

The SS3P4LHM3_A/I is a surface mount Schottky diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40V DC reverse voltage and 3A average rectified current in a TO-277A (SMPC) package. This part is classified as Active and carries automotive-grade qualification under AEC-Q101. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring fast recovery Schottky rectification in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	470 mV @ 3 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	250	µA @ 40 V
Technology	Schottky	—
Package / Case	TO-277, 3-PowerDFN	—
Mounting Type	Surface Mount	—
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 eligibility for the SS3P4LHM3_A/I is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) Maximum: 40 V (exact match required)
Current - Average Rectified (Io): 3 A (exact match required)
Technology: Schottky (exact match required)
Package / Case: TO-277, 3-PowerDFN (exact match required)
Mounting Type: Surface Mount (exact match required)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)
Operating Temperature Range: -55°C to 150°C (exact match required)

Parametric Equivalents meet all primary criteria with identical electrical and mechanical specifications. These parts are direct functional replacements with no derating or circuit modification required.

Manufacturer Recommended Alternatives may exceed primary specifications (higher current rating) but maintain voltage, package, and thermal compatibility. These parts are suitable for applications where higher current capacity provides design margin, provided circuit design accommodates the different forward voltage characteristics.

Parameter Comparison

Parameter	SS3P4LHM3_A/I (Main)	SS3P4L-M3/86A (Parametric Equivalent)	SS3P4LHM3_A/H (Parametric Equivalent)	FSV540 (MFR Recommended)
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	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
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
Supplier Device Package	TO-277A (SMPC)	TO-277A (SMPC)	TO-277A (SMPC)	TO-277-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Parametric Equivalents (SS3P4L-M3/86A and SS3P4LHM3_A/H):

SS3P4L-M3/86A and SS3P4LHM3_A/H are direct parametric equivalents to SS3P4LHM3_A/I. Both parts maintain identical voltage, current, forward voltage, and thermal specifications. SS3P4LHM3_A/H carries automotive-grade qualification and AEC-Q101 certification matching the main part. SS3P4L-M3/86A is designated as part of the eSMP® series and does not carry explicit automotive qualification in the provided data. For applications requiring automotive compliance, SS3P4LHM3_A/H is the preferred parametric equivalent. Both parts are Active status and ROHS3 compliant.

Manufacturer Recommended Alternative (FSV540):

FSV540 is a onsemi Schottky diode rated for 40V and 5A average rectified current in the same TO-277-3 package. This part exceeds the 3A current specification of the main part and carries a higher forward voltage (520 mV @ 5 A versus 470 mV @ 3 A). FSV540 is designated as "Not For New Designs" and should be used only in legacy system support or where higher current capacity is required and circuit design accommodates the increased forward voltage drop. FSV540 is ROHS3 compliant and MSL 1.

Compliance Summary:

All listed parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity). Operating temperature range is uniform across all parts (-55°C to 150°C junction temperature). For new automotive designs, SS3P4LHM3_A/H is the recommended parametric equivalent due to maintained AEC-Q101 qualification.

Frequently Asked Questions (FAQ)

Q: Can SS3P4L-M3/86A be used as a direct replacement for SS3P4LHM3_A/I in automotive applications?

A: SS3P4L-M3/86A is a parametric equivalent with identical electrical specifications (40V, 3A, 470 mV forward voltage). However, the provided data does not explicitly confirm automotive-grade qualification or AEC-Q101 certification for this part. For automotive applications requiring AEC-Q101 compliance, SS3P4LHM3_A/H is the recommended choice.

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

A: Both parts are parametric equivalents with identical electrical and thermal specifications. The primary difference is the suffix designation (_A/H versus _A/I), which typically indicates different manufacturing date codes or internal revision levels. Both carry automotive-grade qualification and AEC-Q101 certification. Substitution is direct with no circuit modification required.

Q: Can FSV540 be used instead of SS3P4LHM3_A/I?

A: FSV540 is rated for 5A versus 3A and has a higher forward voltage (520 mV @ 5 A versus 470 mV @ 3 A). While the 40V reverse voltage and TO-277 package are compatible, the increased forward voltage will result in higher power dissipation. FSV540 is designated "Not For New Designs" and should be used only for legacy system support where higher current capacity is required and thermal design accommodates the increased voltage drop.

Q: Are all substitute parts available in the same packaging format?

A: All listed parts use the TO-277, 3-PowerDFN package for surface mount assembly. Supplier device package designations vary slightly (TO-277A SMPC for Vishay parts, TO-277-3 for onsemi FSV540), but these are equivalent mechanical and electrical packages suitable for the same PCB footprint and reflow soldering process.

Q: What is the significance of the eSMP® series designation for SS3P4L-M3/86A?

A: eSMP® is a Vishay product series designation. The eSMP® designation indicates the part belongs to Vishay's enhanced surface mount package family. This does not affect electrical equivalence or substitution eligibility; it is a manufacturing and product line classification.

Q: Are there any thermal or reliability differences between the parametric equivalents?

A: The provided data shows identical operating temperature ranges (-55°C to 150°C junction temperature) and reverse leakage characteristics (250 µA @ 40 V) for all parametric equivalents. No thermal or reliability differences are specified in the provided parameters.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the lowest moisture sensitivity level. These parts can be stored indefinitely without moisture bake-out requirements prior to reflow soldering, providing maximum handling flexibility in manufacturing and inventory management.

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