FSV540 Equivalent & Substitute Parts

Part Overview

The FSV540 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 5 A average rectified current in a surface mount TO-277-3 package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and operates across a junction temperature range of -55°C to 150°C. Due to its discontinued design status, equivalent and substitute parts from active manufacturers are necessary for ongoing production and maintenance applications requiring compatible electrical and mechanical characteristics.

Key Parameters

Parameter	FSV540 Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 5 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	250 µA @ 40 V	µA
Capacitance @ Vr, F	730pF @ 0V, 1MHz	pF
Mounting Type	Surface Mount	—
Package / Case	TO-277, 3-PowerDFN	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FSV540 is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal 5 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 520 mV @ 5 A
Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 250 µA @ 40 V

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: TO-277, 3-PowerDFN
Operating Temperature - Junction: Must support -55°C to 150°C range
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute Categories:

Parametric Equivalents (Identical Electrical Ratings): Parts meeting all electrical specifications with 40 V reverse voltage and 5 A current rating. These include SS5P4-M3/86A, SS5P4-M3/87A, SS5P4HM3_A/H, SS5P4HM3_A/I, SV540B_R2_00001, and SV540_R2_00001. All maintain 520 mV forward voltage drop at 5 A and fast recovery characteristics.

Direct Manufacturer Equivalent (Higher Voltage Rating): The DST560S-A from Littelfuse Inc. operates at 60 V reverse voltage with identical 5 A current rating. This part is suitable for applications where higher voltage margin is acceptable, though forward voltage increases to 750 mV @ 5 A.

Similar Manufacturer Part (Identical Electrical Ratings, Different Package Variant): The PMEG040V050EPDZ from Nexperia USA Inc. matches the 40 V and 5 A specifications with identical 520 mV forward voltage but uses a CFP15 package variant within the TO-277, 3-PowerDFN family.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	Automotive Grade
FSV540	onsemi	40	5	520 @ 5A	250 @ 40V	TO-277-3	Not For New Designs	—
SS5P4-M3/86A	Vishay General Semiconductor	40	5	520 @ 5A	250 @ 40V	TO-277A (SMPC)	Active	—
SS5P4-M3/87A	Vishay General Semiconductor	40	5	520 @ 5A	250 @ 40V	TO-277A (SMPC)	Active	—
SS5P4HM3_A/H	Vishay General Semiconductor	40	5	520 @ 5A	250 @ 40V	TO-277A (SMPC)	Active	AEC-Q101
SS5P4HM3_A/I	Vishay General Semiconductor	40	5	520 @ 5A	250 @ 40V	TO-277A (SMPC)	Active	AEC-Q101
SV540B_R2_00001	Panjit International Inc.	40	5	520 @ 5A	250 @ 40V	TO-277B	Active	—
SV540_R2_00001	Panjit International Inc.	40	5	520 @ 5A	250 @ 40V	TO-277	Active	—
PMEG040V050EPDZ	Nexperia USA Inc.	40	5	520 @ 5A	120 @ 40V	CFP15	Not For New Designs	AEC-Q101
DST560S-A	Littelfuse Inc.	60	5	750 @ 5A	700 @ 60V	TO-277B	Active	AEC-Q101

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents with Active Status):

The Vishay General Semiconductor eSMP® series parts SS5P4-M3/86A and SS5P4-M3/87A are direct parametric equivalents with active product status. Both maintain identical electrical specifications (40 V, 5 A, 520 mV forward voltage) and operate across the required -55°C to 150°C junction temperature range. SS5P4-M3/86A is available in Cut Tape (CT) & Digi-Reel® packaging, while SS5P4-M3/87A is supplied in Tape & Reel (TR) format. Selection between these variants depends on procurement and assembly requirements.

The Vishay automotive-qualified variants SS5P4HM3_A/H and SS5P4HM3_A/I provide identical electrical performance with AEC-Q101 certification, suitable for applications requiring automotive-grade components. Both are active products with high inventory availability (86,100 and 6,700 units respectively).

Secondary Substitutes (Parametric Equivalents from Alternative Manufacturers):

Panjit International Inc. offers SV540B_R2_00001 and SV540_R2_00001, both with active product status and identical 40 V, 5 A electrical specifications. These parts maintain 520 mV forward voltage and 250 µA reverse leakage characteristics. Package variants differ slightly (TO-277B and TO-277 respectively), but both conform to the TO-277, 3-PowerDFN family.

Higher Voltage Alternative:

The Littelfuse DST560S-A provides 60 V reverse voltage rating with identical 5 A current capacity and active product status with AEC-Q101 automotive qualification. This part is suitable for applications where increased voltage margin is beneficial, though forward voltage increases to 750 mV @ 5 A and reverse leakage rises to 700 µA @ 60 V. This substitution is valid only when circuit design permits the higher forward voltage drop and leakage current.

Similar Manufacturer Option:

The Nexperia PMEG040V050EPDZ matches the 40 V and 5 A specifications with identical 520 mV forward voltage but features lower reverse leakage (120 µA @ 40 V) and AEC-Q101 automotive qualification. However, this part carries "Not For New Designs" status, limiting its suitability for new applications despite superior leakage characteristics.

All recommended substitutes maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity, and surface mount configuration compatible with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the FSV540 be directly replaced with any of the Vishay SS5P4 series parts?

A: Yes. The SS5P4-M3/86A, SS5P4-M3/87A, SS5P4HM3_A/H, and SS5P4HM3_A/I are parametric equivalents with identical 40 V reverse voltage, 5 A current rating, and 520 mV forward voltage specifications. All operate across the required -55°C to 150°C temperature range and maintain fast recovery characteristics. The primary difference is packaging format (Cut Tape vs. Tape & Reel) and automotive qualification status on the HM3 variants.

Q: What is the difference between TO-277-3, TO-277A, TO-277B, and CFP15 packages?

A: All these variants belong to the TO-277, 3-PowerDFN package family and are mechanically compatible for surface mount assembly. The designations (TO-277-3, TO-277A, TO-277B, CFP15) represent manufacturer-specific package nomenclature for the same physical form factor. PCB footprints and reflow profiles remain consistent across these variants.

Q: Is the Littelfuse DST560S-A a suitable replacement for the FSV540?

A: The DST560S-A is electrically compatible for applications where higher reverse voltage margin is acceptable. It maintains the 5 A current rating and fast recovery characteristics but operates at 60 V (versus 40 V) with increased forward voltage (750 mV @ 5 A versus 520 mV) and higher reverse leakage (700 µA @ 60 V versus 250 µA). This substitution is valid only when circuit design accommodates these parameter differences.

Q: Why do some substitute parts have AEC-Q101 automotive qualification while others do not?

A: AEC-Q101 certification indicates the part meets automotive industry reliability and quality standards. Parts without this certification are suitable for general industrial and commercial applications. The SS5P4HM3_A/H, SS5P4HM3_A/I, PMEG040V050EPDZ, and DST560S-A carry AEC-Q101 qualification, making them appropriate for automotive circuit designs. Non-qualified parts remain suitable for non-automotive applications with identical electrical performance.

Q: What inventory considerations should guide part selection?

A: Vishay SS5P4HM3_A/H offers the highest inventory availability (86,100 units), followed by SS5P4-M3/86A (90,500 units in Cut Tape format). Panjit SV540_R2_00001 provides 4,074 units, while SS5P4HM3_A/I and SS5P4-M3/87A offer 6,700 and 6,800 units respectively. Littelfuse DST560S-A maintains 12,100 units. Selection based on inventory availability should be balanced against specific application requirements for voltage rating and automotive qualification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (SS5P4-M3/86A, SS5P4-M3/87A, SS5P4HM3_A/H, SS5P4HM3_A/I, SV540B_R2_00001, SV540_R2_00001, PMEG040V050EPDZ, and DST560S-A) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the FSV540 compliance profile.

Q: Can the FSV540 be used in new product designs?

A: No. The FSV540 is classified as "Not For New Designs." New designs should utilize active-status alternatives such as the Vishay SS5P4 series, Panjit SV540 series, or Littelfuse DST560S-A, all of which maintain equivalent or superior electrical specifications with ongoing manufacturer support.

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