FSV240AF Equivalent & Substitute Parts

Part Overview

The FSV240AF is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 2 A average rectified current in a DO-214AD (SMAF) surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating available packaging options.

Key Parameters

Parameter	FSV240AF
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A
Reverse Recovery Time (trr)	9.65 ns
Current - Reverse Leakage @ Vr	100 µA @ 40 V
Capacitance @ Vr, F	98 pF @ 4 V, 1 MHz
Package / Case	DO-214AD, SMAF
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FSV240AF are selected based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating equal to or greater than 40 V
Current - Average Rectified (Io) rating equal to or greater than 2 A
Technology: Schottky rectifier diode
Operating temperature range encompassing -55°C to 150°C
RoHS3 compliance and MSL 1 rating
Surface mount configuration

Acceptable Variations:

Forward voltage (Vf) within engineering tolerance for the application
Reverse leakage current within acceptable limits for the circuit function
Package variations permitted when mechanical fit and thermal characteristics are compatible with board layout

The substitute parts identified maintain the core electrical specifications while offering alternative packaging formats and current ratings suitable for direct replacement or design flexibility.

Parameter Comparison

Parameter	FSV240AF	SB24AFC_R1_00001	MBRAF440T3G	SS24FSH	VSSAF3L45-M3/6A
Manufacturer	onsemi	Panjit International Inc.	onsemi	Taiwan Semiconductor Corporation	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	45 V
Current - Average Rectified (Io)	2 A	2 A	4 A	2 A	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 2 A	485 mV @ 4 A	570 mV @ 2 A	540 mV @ 3 A
Current - Reverse Leakage @ Vr	100 µA @ 40 V	100 µA @ 40 V	300 µA @ 40 V	200 µA @ 40 V	450 µA @ 45 V
Capacitance @ Vr, F	98 pF @ 4 V, 1 MHz	98 pF @ 4 V, 1 MHz	Not specified	124 pF @ 4 V, 1 MHz	425 pF @ 4 V, 1 MHz
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 150°C
Package / Case	DO-214AD, SMAF	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	SOD-128	DO-221AC, SMA Flat Leads
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SB24AFC_R1_00001 (Panjit International Inc.)

This substitute provides direct electrical equivalence to the FSV240AF with identical voltage, current, forward voltage, and reverse leakage specifications. The part is active in production status, ensuring long-term availability. Package format differs (DO-221AC SMA Flat Leads versus DO-214AD SMAF), requiring board layout verification. RoHS3 compliance and MSL 1 rating match the original specification.

MBRAF440T3G (onsemi)

This onsemi part offers increased current capacity (4 A versus 2 A) while maintaining 40 V reverse voltage rating. Forward voltage is slightly lower (485 mV @ 4 A), providing improved efficiency characteristics. Package format is DO-221AC SMA Flat Leads. Active product status ensures availability. Suitable for applications requiring higher current margin or thermal headroom. Board layout modification required due to package change.

SS24FSH (Taiwan Semiconductor Corporation)

This part maintains 40 V voltage and 2 A current ratings with identical operating temperature range. Forward voltage is higher (570 mV @ 2 A) and reverse leakage is elevated (200 µA @ 40 V). Package format is SOD-128, differing from the original. Automotive qualification (AEC-Q101) is provided. Active production status confirmed. Suitable for automotive applications where AEC-Q101 qualification is required.

VSSAF3L45-M3/6A (Vishay General Semiconductor)

This TMBS® series part provides 45 V reverse voltage rating and 3 A current capacity, exceeding FSV240AF specifications. Forward voltage is 540 mV @ 3 A. Operating temperature minimum is -40°C (versus -55°C), which may limit low-temperature applications. Package format is DO-221AC SMA Flat Leads. Active production status confirmed. Suitable for applications with relaxed low-temperature requirements and higher current or voltage margins.

Frequently Asked Questions (FAQ)

Q: Can the SB24AFC_R1_00001 be used as a direct replacement for the FSV240AF?

A: The SB24AFC_R1_00001 provides electrical equivalence with identical voltage, current, and forward voltage specifications. However, the package format differs (DO-221AC SMA Flat Leads versus DO-214AD SMAF). Board layout and footprint compatibility must be verified before implementation.

Q: What is the primary difference between the MBRAF440T3G and the FSV240AF?

A: The MBRAF440T3G is rated for 4 A average rectified current compared to the FSV240AF's 2 A rating. Both maintain 40 V reverse voltage. The higher current rating provides additional design margin. Package format differs, requiring board layout modification.

Q: Is the SS24FSH suitable for all applications using the FSV240AF?

A: The SS24FSH maintains the 40 V voltage and 2 A current ratings. However, forward voltage is higher (570 mV versus 500 mV) and reverse leakage is elevated (200 µA versus 100 µA). These differences may affect circuit performance in sensitive applications. The part includes AEC-Q101 automotive qualification, making it suitable for automotive designs.

Q: Why does the VSSAF3L45-M3/6A have a different minimum operating temperature?

A: The VSSAF3L45-M3/6A operates from -40°C to 150°C, compared to the FSV240AF's -55°C to 150°C range. Applications requiring operation below -40°C cannot use this substitute. Verify application temperature requirements before selection.

Q: What packaging considerations apply when substituting these parts?

A: The FSV240AF uses DO-214AD (SMAF) packaging. Substitute parts use DO-221AC (SMA Flat Leads) or SOD-128 formats. Physical dimensions, footprint, and thermal characteristics differ. Board layout, solder pad design, and thermal management must be re-evaluated for each package type.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the FSV240AF specification.

Q: Which substitute part offers the best electrical match to the FSV240AF?

A: The SB24AFC_R1_00001 provides the closest electrical match with identical voltage (40 V), current (2 A), forward voltage (500 mV @ 2 A), reverse leakage (100 µA @ 40 V), and capacitance (98 pF @ 4 V, 1 MHz) specifications. Package format is the only difference.

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