BAS40-02V-V-G-08 Equivalent & Substitute Parts

Part Overview

The BAS40-02V-V-G-08 is a Schottky diode rated for 40 V DC reverse voltage and 120 mA average rectified current in a surface mount SOD-523 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	120 mA
Voltage - Forward (Vf) (Max) @ If	380 mV @ 1 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	100 nA @ 30 V
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz
Package / Case	SC-79, SOD-523
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BAS40-02V-V-G-08 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 120 mA
Technology: Schottky diode type
Reverse Recovery Time (trr): 5 ns or faster

Physical Compatibility Requirements:

Package / Case: SC-79, SOD-523 (surface mount)
Mounting Type: Surface Mount

Regulatory Compliance:

RoHS3 Compliant status required

Substitute parts are grouped into two categories:

Direct Equivalents (Pin-Compatible, Identical Current Rating): Parts with 120 mA current rating in SOD-523 package that maintain electrical performance within the original specification envelope.

Higher Current Capacity Substitutes (Pin-Compatible, Enhanced Current Rating): Parts with current ratings of 200 mA or higher in SOD-523 package that provide superior performance margin while maintaining 40 V reverse voltage rating and SOD-523 package compatibility.

Package Variant Substitutes (Alternative Surface Mount Package): Parts with equivalent electrical specifications but in alternative surface mount packages (0603/SOD-523F) that require PCB layout modification.

Parameter Comparison

Parameter	BAS40-02V-V-G-08 (Main)	BAS40-02V-G3-08	1PS79SB40,115	BAT54KFILM	CDBU40	PMEG4002EB,115
Manufacturer	Vishay	Vishay	Nexperia	STMicroelectronics	Comchip	Nexperia
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	120 mA	120 mA	120 mA	300 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	380 mV @ 1 mA	1 V @ 40 mA	1 V @ 40 mA	900 mV @ 100 mA	1 V @ 40 mA	600 mV @ 200 mA
Reverse Recovery Time (trr)	5 ns	5 ns	Not specified	5 ns	5 ns	Not specified
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	10 µA @ 40 V	1 µA @ 30 V	200 nA @ 30 V	500 nA @ 25 V
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz	4 pF @ 0 V, 1 MHz	5 pF @ 0 V, 1 MHz	10 pF @ 1 V, 1 MHz	5 pF @ 0 V, 1 MHz	20 pF @ 1 V, 1 MHz
Package / Case	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523	2-SMD, No Lead (0603/SOD-523F)	SC-79, SOD-523
Operating Temperature - Junction	-55°C ~ 125°C	125°C (Max)	150°C (Max)	-40°C ~ 150°C	125°C (Max)	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BAS40-02V-G3-08 (Vishay): This part is the direct equivalent to the obsolete BAS40-02V-V-G-08. It maintains identical electrical specifications including 40 V reverse voltage, 120 mA current rating, 5 ns reverse recovery time, and SOD-523 package. The primary difference is product status: BAS40-02V-G3-08 is active with 8420 units in stock. This part is the preferred substitute for direct replacement in existing designs. RoHS3 compliance is maintained.

1PS79SB40,115 (Nexperia): This part meets all electrical requirements with 40 V reverse voltage and 120 mA current rating in SOD-523 package. It is qualified to AEC-Q100 automotive standard and supports extended operating temperature to 150°C maximum. This part is suitable for applications requiring automotive-grade components. RoHS3 compliance is maintained.

BAT54KFILM (STMicroelectronics): This part provides enhanced current capacity at 300 mA while maintaining 40 V reverse voltage and SOD-523 package compatibility. It is classified as fast recovery with reverse recovery time of 5 ns. Operating temperature range extends to -40°C ~ 150°C. This part is suitable for applications requiring higher current margin or extended temperature range. RoHS3 compliance is maintained.

CDBU40 (Comchip): This part provides 200 mA current capacity with 40 V reverse voltage. It uses an alternative surface mount package (0603/SOD-523F) instead of the standard SOD-523. PCB layout modification is required for this substitution. RoHS3 compliance is maintained.

PMEG4002EB,115 (Nexperia): This part provides 200 mA current capacity with 40 V reverse voltage in SOD-523 package. Operating temperature extends to 150°C maximum. This part is suitable for applications requiring higher current capacity without package modification. RoHS3 compliance is maintained.

Frequently Asked Questions (FAQ)

Q: Can BAS40-02V-G3-08 be used as a direct replacement for BAS40-02V-V-G-08?

A: Yes. BAS40-02V-G3-08 is a direct equivalent with identical electrical specifications (40 V reverse voltage, 120 mA current, 5 ns reverse recovery time) and identical SOD-523 package. The only difference is product status: BAS40-02V-G3-08 is active while the original is obsolete. No circuit or PCB modifications are required.

Q: What is the difference between the 120 mA rated parts and the 200-300 mA rated parts?

A: The 200-300 mA rated parts (BAT54KFILM, CDBU40, PMEG4002EB,115) provide higher current capacity than the original 120 mA specification. These parts are suitable for applications where additional current margin is beneficial. All maintain the 40 V reverse voltage rating and SOD-523 package (except CDBU40 which uses 0603/SOD-523F). Higher current capacity does not degrade performance in lower current applications.

Q: Is CDBU40 compatible with the original PCB layout?

A: CDBU40 uses a different surface mount package (0603/SOD-523F) compared to the standard SOD-523 package of the original part. PCB layout modification is required for this substitution. The footprint and pad configuration differ from the original design.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant, matching the compliance status of the original BAS40-02V-V-G-08.

Q: Which substitute part has the lowest forward voltage drop?

A: The original BAS40-02V-V-G-08 specifies 380 mV @ 1 mA forward voltage. Among the substitutes, BAT54KFILM specifies 900 mV @ 100 mA, PMEG4002EB,115 specifies 600 mV @ 200 mA, and BAS40-02V-G3-08, 1PS79SB40,115, and CDBU40 all specify 1 V @ 40 mA. Forward voltage characteristics vary with measurement conditions and current levels.

Q: Which substitute part supports the widest operating temperature range?

A: BAT54KFILM supports -40°C ~ 150°C operating temperature range, which is the widest among all listed parts. The original BAS40-02V-V-G-08 supports -55°C ~ 125°C.

Q: Can I use a higher current rated part in a circuit designed for 120 mA?

A: Yes. Parts rated for 200 mA or 300 mA can be used in circuits designed for 120 mA operation. The higher current rating provides additional margin and does not negatively affect circuit performance at lower current levels. All electrical parameters remain within specification.

Q: Is 1PS79SB40,115 suitable for automotive applications?

A: Yes. 1PS79SB40,115 is qualified to AEC-Q100 automotive standard, making it suitable for automotive-grade applications requiring this qualification.

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